WO2006011285A1 - 情報記録媒体 - Google Patents
情報記録媒体 Download PDFInfo
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- WO2006011285A1 WO2006011285A1 PCT/JP2005/009163 JP2005009163W WO2006011285A1 WO 2006011285 A1 WO2006011285 A1 WO 2006011285A1 JP 2005009163 W JP2005009163 W JP 2005009163W WO 2006011285 A1 WO2006011285 A1 WO 2006011285A1
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Classifications
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- G11B7/2403—Layers; Shape, structure or physical properties thereof
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/011—Manufacture or treatment of multistable switching devices
- H10N70/021—Formation of switching materials, e.g. deposition of layers
- H10N70/026—Formation of switching materials, e.g. deposition of layers by physical vapor deposition, e.g. sputtering
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/20—Multistable switching devices, e.g. memristors
- H10N70/231—Multistable switching devices, e.g. memristors based on solid-state phase change, e.g. between amorphous and crystalline phases, Ovshinsky effect
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/801—Constructional details of multistable switching devices
- H10N70/821—Device geometry
- H10N70/826—Device geometry adapted for essentially vertical current flow, e.g. sandwich or pillar type devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
- H10N70/801—Constructional details of multistable switching devices
- H10N70/881—Switching materials
- H10N70/882—Compounds of sulfur, selenium or tellurium, e.g. chalcogenides
- H10N70/8828—Tellurides, e.g. GeSbTe
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/21—Circular sheet or circular blank
Definitions
- the present invention relates to an information recording medium on which information is optically or electrically recorded, erased, rewritten and reproduced.
- DVD-RAM 4.7 GBZDVD-RAM
- 2x speed and 3x speed have already been commercialized.
- Ge-Sn-Sb-Te An example of a recording layer material that has been put to practical use in DVD-RAM is Ge-Sn-Sb-Te (see, for example, Japanese Patent Publication No. 2001-322357).
- This Ge—Sn—Sb—Te is a material having a higher crystallization speed than a conventional high-speed crystallization material, for example, Ge—Sb—Te (see, for example, Japanese Patent No. 2584741).
- Ge—Sn—Sb—Te is a material in which SnTe is added to a GeTe—Sb Te binary system.
- SnTe is a very crystalline material that is crystalline at room temperature even in the form of a thin film.
- SnTe is a Te compound and has the same rock salt structure as GeTe, so it is added to GeTe to replace part of GeTe. Therefore, Ge—Sn—Sb—Te can exhibit a high crystallization rate without causing phase separation by repeated recording.
- media that support double speed and media that support triple speed are now commercially available.
- Media that supports 3x speed usually has 2x compatibility.
- a medium compatible with 3 ⁇ speed means a medium that can be recorded, erased and rewritten at 2 ⁇ speed or 3 ⁇ speed, and is reliable even when any speed is used.
- the ratio of 3x recording linear velocity to 2x is 1.5x, and changing the speed from 2x to 3x (or vice versa) is done by changing the number of revolutions of the media.
- the recording method currently used is a method of recording at a constant rotation speed (this recording method is also called the CAV (constant angular velocity) method).
- the linear velocity at the outermost circumference of the medium is about 2.4 times the linear velocity at the innermost circumference.
- a phase change type information recording medium recording, erasing, and overwriting (rewriting) are performed using a reversible phase change between an amorphous phase (recording) and a crystalline phase (erasing). . Therefore, in order to perform recording at a predetermined linear velocity, the crystallization speed is adjusted by changing the composition of the recording layer. It is. When the linear velocity is high, the crystallization rate is increased. When the linear velocity is low, the crystallization rate is decreased. Generally, if the crystallization speed is increased, erasure becomes easier. However, the stability of the recording mark (amorphous phase) is impaired, and the reliability of the medium tends to decrease immediately.
- the Ge-Bi-Te material has a crystallization speed that can sufficiently cope with 16-times speed, but also ensures the stability of signals recorded at 16-times speed (ie, an amorphous phase formed at 16-times speed). It has the problem of being impossible! /.
- Ge—Sn—Sb—Te materials and Ge—Bi—Te materials are capable of recording at high linear velocities and providing a medium compatible with recording in a wide linear velocity range. Not in.
- the present invention solves the above-described conventional problems, and provides a recording material having both a high crystallization speed and stability of an amorphous phase. Furthermore, by applying this recording material, an object is to provide an information recording medium having high erasing performance and excellent recording storability in a high linear velocity and a wide linear velocity range regardless of the recording wavelength.
- the information recording medium of the present invention is an information recording medium including a recording layer capable of causing a reversible phase change.
- the recording layer includes Ge, Bi, Te, and an element M, and the following formula (1) :
- M represents at least one element selected from Al, Ga and In, and a, b and d 25 ⁇ a ⁇ 60, 0 ⁇ b ⁇ 18, 35 ⁇ d ⁇ 55, 82 ⁇ a + b + d (100 is satisfied) ! /
- “atomic%” is expressed by the formula (1) using the number of “Ge” atoms, “Bi” atoms, “Te” atoms, and “M” atoms combined as a reference (100%). It is shown that it is a composition formula. In the following formulas, “atomic%” is also used for the same purpose.
- Formula (1) represents only “Ge” atoms, “Bi” atoms, “Te” atoms, and “M” atoms included in the recording layer. Therefore, the recording layer may contain components other than these atoms (for example, oxygen, hydrogen, argon, nitrogen, carbon, etc.).
- the information recording medium of the present invention is a medium for recording and reproducing information by irradiating light or applying electric energy.
- the present invention is applied to various recordable media such as a medium that repeatedly records information (so-called rewritable medium) and a medium that can record information only once (so-called write-once medium).
- rewritable medium a medium that repeatedly records information
- write-once medium a medium that can record information only once
- light irradiation is performed by irradiating a laser beam (that is, a laser beam), and electric energy is applied by applying a voltage to the recording layer.
- the recording layer has at least one element selected from Al, Ga and ⁇ ⁇ in addition to Ge, Bi and Te (in the present specification, indicated by “ ⁇ ”). It is characterized by comprising a material containing By including at least one element selected for Al, Ga, and In force in the above-mentioned ratio, the crystallization temperature of Ge Bi Te-based materials can be increased, and a stable signal can be formed. It becomes.
- the Ge—Bi—Te—M material contained in the recording layer is represented by the following formula (3):
- x 2 3 y 2 3 1 -y 100-x (Where M represents at least one element for which Al, Ga and In forces are also selected, and x and y satisfy 80 ⁇ x ⁇ 100, 0 ⁇ y ⁇ 0.9)
- Equation (3) shows that Ge—Bi—Te—M-based materials are GeTe, M Te
- mol% indicates that the formula (3) is a composition formula expressed with the total number of each compound as a reference (100%). In the following formulas, “mol%” is also used for the same purpose.
- X and y are appropriately selected according to the wavelength of the laser beam used for recording and reproduction.
- the materials contained in the recording layer of a medium that records and reproduces information using a laser beam having a wavelength of 650 to 670 nm are X and y 1S 80 ⁇ x ⁇ 91, and y It is preferable to satisfy ⁇ 0.5.
- the material contained in the recording layer of a medium that records and reproduces information using a laser beam with a wavelength of 395 to 415 nm (for example, Blu-ray Disc) is such that X and y are 85 ⁇ x ⁇ 98 and y ⁇ It is preferable to satisfy 0.8
- the recording layer further contains Sn, and the formula (2):
- M represents at least one element selected from Al, Ga and In, and a, b, d and f are 25 ⁇ a ⁇ 60, 0 ⁇ b ⁇ 18, 35 ⁇ d ⁇ 55, 0 ⁇ f ⁇ 15, 82 ⁇ a + b + d ⁇ 100, 82 a + b + d + f ⁇ 100)
- the Ge-Sn-Bi-Te-M-based material has the following formula (4):
- Formula (4) shows that when the Ge—Sn—Bi—Te—M based material is a mixture of GeTe, SnTe, M Te and Bi Te, the preferred ratio of the four compounds is
- X is appropriately selected according to the wavelength of the laser beam used for recording and reproduction.
- the material contained in the recording layer of a medium that records and reproduces information using laser light with a wavelength of 650 to 670 nm (for example, DVD-RAM), X must satisfy 80 ⁇ x ⁇ 91. preferable.
- the material contained in the recording layer of a medium for recording and reproducing information using a laser beam having a wavelength of 395 to 415 nm (for example, Blu-ray Disc) preferably has x satisfying 85 ⁇ x ⁇ 98.
- the information recording medium of the present invention includes two or more information layers, and at least one of the information layers includes a Ge Bi—Te—M-based material represented by the above formula (1). Can be offered as a thing.
- the recording layer containing the Ge Bi—Te—M material includes the Ge Sn—Bi Te—M material represented by the above formula (2) in which Sn is added to the Ge Bi—Te—M material. It may be.
- This information recording medium can record information at high speed by a recording layer containing Ge Bi Te-M-based material or Ge-Sn-Bi-Te-M-based material, and has high reliability (specifically Has record storage properties).
- the information recording medium of the present invention includes a substrate, a first dielectric layer, and the Ge Bi
- the “first dielectric layer” refers to a dielectric layer that is closer to the incident light
- the “second dielectric layer” refers to the incident light. This is a dielectric layer that is located farther from the point. That is, the irradiated light reaches the second dielectric layer from the first dielectric layer via the recording layer.
- This information recording medium is, for example, a medium that performs recording and reproduction by irradiating laser light having a wavelength of 650 to 670 nm or laser light having a wavelength of 395 to 415 nm from the substrate side. It is.
- the thickness of the first dielectric layer is preferably 10 Onm or more and 180 nm or less
- the thickness of the second dielectric layer 2 is preferably 20 nm or more and 60 ⁇ m or less. ,.
- the information recording medium of the present invention includes at least a substrate, a reflective layer, a second dielectric layer, a recording layer containing the Ge—Bi—Te—M material, and a first dielectric layer. These layers are provided as a medium in which these layers are formed in this order.
- This medium also records and reproduces information by irradiating light.
- this medium is a medium on which recording and reproduction are performed by irradiating a laser beam having a wavelength of 395 to 415 nm or a laser beam having a wavelength of 650 to 670 nm from the side opposite to the substrate.
- the first dielectric layer has a thickness of 1 Onm or more and lOOnm or less
- the second dielectric layer has a thickness of 3 nm or more and 50 nm or less.
- the present invention also provides a manufacturing method including a step of forming a recording layer containing the Ge—Bi—Te—M-based material described above by a sputtering method as a method of manufacturing the information recording medium of the present invention.
- a sputtering method a recording layer having a desired composition can be formed by appropriately adjusting the composition of the sputtering target. If the sputtering target is a target containing Ge, Bi, Te, M, and Sn, a recording layer containing a Ge—Sn—Bi—Te—M based material can be formed.
- the present invention also provides a spindle motor that rotates an information recording medium including a recording layer, and an optical head that includes a semiconductor laser that emits laser light, as an apparatus for recording and reproducing information on the information recording medium of the present invention.
- an information recording medium recording / reproducing apparatus including an objective lens for condensing the laser beam on the recording layer.
- a spindle motor that can rotate at 10,000 rotations Z is used, whereby information can be recorded on a medium having a diameter of 12 cm at 16 times speed. It becomes possible.
- the optical head may emit a laser beam having a wavelength of 650 to 670 nm, or may emit a laser beam having a wavelength of 395 to 415 nm. Or have both optical heads Yes.
- the information recording medium of the present invention for example, even when recording information on a DVD-RAM is performed at a speed selected from a high and wide linear velocity range from 16 times speed to 6 times speed, High erasing performance and excellent record storability can be achieved. Further, according to the present invention, regardless of the recording density and capacity of the medium and the recording wavelength, the erasure performance is high even at a high linear velocity, and the recording stability of a signal recorded at a low linear velocity is excellent. An information recording medium capable of high-speed recording with a capacity can be provided.
- FIG. 1 is a partial sectional view showing an example of an information recording medium of the present invention.
- FIG. 2 is a partial sectional view showing still another example of the information recording medium of the present invention.
- FIG. 3 is a partial sectional view showing still another example of the information recording medium of the present invention.
- FIG. 4 is a partial sectional view showing still another example of the information recording medium of the present invention and a schematic diagram showing an example of a system using the same.
- FIG. 5 is a schematic diagram showing an example of a sputtering (film formation) apparatus used in the method for producing an information recording medium of the present invention.
- FIG. 6 is a schematic diagram showing an example of a recording / reproducing apparatus for an information recording medium of the present invention.
- Figure 1 shows a partial cross section of the optical information recording medium.
- a first dielectric layer 102 is formed on one surface of a substrate 101, and a first interface layer 103 is formed on the surface of the first dielectric layer 102.
- the recording layer 104 is formed on the surface of the first interface layer 103, the second interface layer 105 is formed on the surface of the recording layer 104, and the second dielectric layer is formed on the surface of the second interface layer 105.
- 106 is formed, the light absorption correction layer 107 is formed on the surface of the second dielectric layer 106, the reflection layer 108 is formed on the surface of the light absorption correction layer 107, and the dummy substrate 110 is attached by the adhesive layer 109. It has a combined configuration.
- the information recording medium having this configuration can be used as a DVD-RAM that records and reproduces information with a red laser beam having a wavelength of around 660 nm.
- the information recording medium 100 configured as described above is incident on the laser beam 111 on the side of the substrate 101, thereby recording and reproducing information.
- the information recording medium of the present invention is characterized in that the recording layer is a layer containing a specific material.
- the recording layer 104 will be described.
- the recording layer 104 undergoes a reversible phase change, includes Ge, Bi, Te, and the element M, and has the following formula (
- the material of the composition represented by these is included. Containing GeTe, M Te, and Bi Te
- GeTe is a material having a large optical change. By containing 80 mol% or more of this, a recording layer having a large optical change can be obtained. The greater the optical change, the greater the detected amplitude of the recorded signal.
- the optical change refers to the difference between the complex refractive index (nc ikc) in the crystalline phase and the complex refractive index (na-ika) in the amorphous phase, ⁇ , and Ak.
- nc is the refractive index in the crystalline phase
- kc is the extinction coefficient in the crystalline phase
- na is the refractive index in the amorphous phase
- ka is the extinction coefficient in the amorphous phase
- a n nc—na
- a k kc—ka.
- nc, kc, na, and ka depend on the wavelength of light, and the shorter the wavelength, the smaller the Ak.
- a laser beam having a recording wavelength of 660 nm used for DVD-RAM recording and Blu-ray Disc can be obtained by including a large amount of optical change and GeTe in the recording layer.
- the ratio needs to be less than 100 mol%, and preferably 98 mol% or less.
- X the larger the value of X, that is, the greater the proportion of GeTe, the larger the Ak and the greater the optical change.
- Bi Te is a very thin film that has a crystallization temperature of room temperature or lower and is crystalline at room temperature. It is a highly crystalline material.
- the GeTe-Bi Te system has the same stoichiometry as the GeTe Sb Te system.
- the GeTe Bi Te system Compared to the fact that the crystallization temperature of the 2 3 film is about 150 ° C, the GeTe Bi Te system
- the material is easier to crystallize than Te.
- M Te is preferably at least one of Al Te, Ga Te, and In Te.
- M Te is a Te compound having the same valence as Bi Te and has a high melting point.
- M Te is Bi Te
- the material added with M Te can be used in GeTe Bi Te materials.
- the crystallization temperature can be increased without causing phase separation by repeated recording.
- M Te can be added without changing the GeTe concentration.
- the GeTe-Bi Te material has
- y is set to 0.9 or less.
- M Te is also crystallized even when added in very small amounts.
- the temperature may be increased, for example, y may be about 0.03.
- the material represented by the above formula (3) may be represented by the following formula (1).
- M represents at least one element selected from Al, Ga and In, and a, b and d are 25 ⁇ a ⁇ 60, 0 ⁇ b ⁇ 18, 35 ⁇ d ⁇ 55, 82 ⁇ a. + b + d (100 is satisfied)
- Equation (1) determines the range of a, b, and d so that such materials can be included.
- Ge ratio is If it is too large, the melting point becomes high and the laser power required for recording becomes large. Therefore, Ge is preferably 60 atomic% or less (ie, a ⁇ 60).
- the conversion temperature is 190 ° C.
- the recording layer 104 may further contain Sn.
- the recording layer 104 preferably contains a material represented by the following formula (4).
- x, y and z are 80 ⁇ x ⁇ 100, 0 ⁇ y ⁇ 0.9, 0 ⁇ z ⁇ 0.3. Meet
- SnTe is a highly crystalline material that has a thin film crystallization temperature below room temperature and is crystalline at room temperature.
- SnTe is a Te compound having the same valence and crystal structure as GeTe and has a high melting point.
- SnTe is a system in which Bi Te is partially substituted with M Te by changing the value of y in the above formula (3).
- the substitution amount z with GeTe is preferably 0.3 or less.
- SnTe is included, a large amount of M Te may be added.
- the value of X is preferably within the above range, but the preferred range of y is not particularly limited.
- the thickness of the recording layer 104 is preferably 5 nm to 12 nm, more preferably 6 nm to 9 nm. If the recording layer is thin, the optical recording means that the information recording medium 100 when the recording layer 104 is in the crystalline phase has a reduced optical reflectance Rc, and the information recording medium when the recording layer 104 is in the amorphous phase. The light reflectance Ra of 100 is increased and the reflectance ratio is decreased. If it is thick, the heat capacity increases and the recording sensitivity deteriorates.
- the substrate 101 is a disk-like plate that is transparent and has a smooth surface.
- the material constituting the substrate include polycarbonate, amorphous polyolefin or polymethylmethacrylate (PMMA), and glass. Considering moldability, price, and mechanical strength, polycarbonate is preferably used.
- a substrate 101 having a thickness of about 0.6 mm and a diameter of 120 mm is preferably used.
- a guide groove for guiding laser light may be formed on the surface of the substrate 101 on the side where the dielectric layer and the recording layer are formed.
- the surface on the side closer to the laser beam 111 is referred to as a “group surface” for the sake of convenience, and the surface on the side farther from the laser beam power is referred to as the “land surface” for convenience.
- the step difference between the group surface and the land surface is preferably 40 nm to 60 nm.
- the distance between the groove lands is about 0.615 m.
- recording is performed on both the group surface and the land surface (that is, the land group recording method is adopted in DVD-RAM).
- the first dielectric layer 102 and the second dielectric layer 106 increase the light absorption efficiency of the recording layer by adjusting the optical distance, so that the reflectance of the crystalline phase and the reflectance of the amorphous phase are reduced. It has a function to increase the signal amplitude by increasing the difference. Further, it also has a function of protecting the recording layer from moisture isoelectricity.
- the first and second dielectric layers 102 and 106 are oxides, sulfides, selenides, nitrides, carbons. It may be formed using one material or a mixture of materials selected from fluoride and fluoride.
- the oxide for example, Al 2 O, CeO, Cr 2 O, Dy 2 O, Ga 2 O,
- Examples thereof include SnO, Ta 2 O, TiO, Y 2 O, Yb 2 O, ZnO, and ZrO.
- the sulfide is, for example, ZnS
- the selenide is, for example, ZnSe.
- nitrides for example, A1N, BN, Cr—N, Ge—N, HfN, NbN, Si N, TaN, TiN, and VN
- carbides include Al C, B C, CaC, Cr C,
- Fluorides such as CeF, DyF, ErF, GdF, HoF, LaF, NdF
- Examples include O 2 SiO—SiC.
- ZnS-SiO is amorphous and has high transparency with low thermal conductivity
- ZnS-SiO is (ZnS) (SiO 2) (mol%)
- the dielectric layer may be formed of a material that does not contain Zn and Z or S. In that case, the preferred material for the dielectric layer is ZrO 2 -Si
- the dielectric layer may contain M oxide contained in the recording layer, that is, MO.
- the first dielectric layer 102 and the second dielectric layer 106 change the optical path length (that is, the product nd of the refractive index n of the dielectric layer and the film thickness d of the dielectric layer).
- the light absorption rate Ac (%) of the recording layer 104 in the crystalline phase the light absorption rate Aa (%) of the recording layer 104 in the amorphous phase, and the light of the information recording medium 100 when the recording layer 104 is in the crystalline phase.
- the information recording medium 100 has a function of adjusting the light phase difference ⁇ .
- the reflectance difference (IRc-RaI) or the reflectance ratio (RcZRa) is large.
- Ac and Aa are large so that the recording layer 104 absorbs the laser light.
- the optical path lengths of the first dielectric layer 102 and the second dielectric layer 106 are determined so that these conditions are satisfied at the same time. The optical path length satisfying these conditions can be accurately determined by calculation based on, for example, the matrix method (see, for example, “Wave Optics” by Hiroshi Kubota, Iwanami Shinsho, 1971, Chapter 3).
- a is a positive number.
- 15% ⁇ Rc and Ra ⁇ 2% it is preferable that 15% ⁇ Rc and Ra ⁇ 2%.
- l ⁇ AcZAa it is preferable that l ⁇ AcZAa.
- the optical path lengths (a ⁇ ) of the first dielectric layer 102 and the second dielectric layer 106 are accurately obtained by calculation based on the matrix method so that the conditions are satisfied at the same time, and from ⁇ and ⁇ A preferable film thickness d can be obtained.
- the thickness (dl) of the first dielectric layer 102 is in the range of 100 nm to 180 nm. It is more preferable that it is within the range of 130 nm to 150 nm.
- the thickness (d2) of the second dielectric layer 106 is 20 nm. It is preferable to be in the range of ⁇ 60 nm, more preferably in the range of 30 nm to 50 nm.
- the first interface layer 103 and the second interface layer 105 are provided between the first dielectric layer 102 and the recording layer 104 and between the second dielectric layer 106 and the recording layer 104. It is provided to prevent mass transfer caused by repeated recording.
- mass transfer means that the laser beam 111 is emitted when the first and second dielectric layers 102 and 106 are formed of, for example, (ZnS) (SiO 2) (mol%).
- the first and second interface layers 103 and 105 are formed of a material containing Zn and Z or S.
- the two interface layers are made of a material that does not include any deviation of Zn and S. More preferred to form.
- the interface layer is preferably formed of a material having high heat resistance that has excellent adhesion to the recording layer 104 and does not melt or decompose when the recording layer 104 is irradiated with the laser beam 111.
- the interfacial layer is formed using a single material or a mixture of multiple materials selected from oxide, nitride, carbide and fluoride forces.
- the oxide for example, Al 2 O, CeO, Cr 2 O, Dy 2 O, Ga 2 O,
- Examples of the nitride include A1N, BN, GeN, HfN, Si—N, Ti—N, VN, and ZrN.
- Examples of carbides include C, Al C, B C, CaC, Cr C, Hf
- Fluorides such as CeF, DvF, ErF, GdF, HoF, LaF, NdF, Y
- the thickness of both the first interface layer 103 and the second interface layer 105 is preferably 1 nm to 10 nm, more preferably 2 nm to 7 nm.
- the interface layer is thick, the light reflectivity and light absorptance of the laminate from the first dielectric layer 102 to the reflective layer 108 formed on the surface of the substrate 101 change, which affects the recording / erasing performance.
- the first dielectric layer 102 and Z or the second dielectric layer 106 is formed of a material containing neither Zn nor S
- the first interface layer 103 and Z or second The interface layer 105 may not be provided.
- the cost of the medium can be reduced, and the film formation process can be reduced, so that productivity is improved.
- the light absorption correction layer 107 adjusts a ratio AcZAa between the light absorption rate Ac when the recording layer 104 is in the crystalline state and the light absorption rate Aa when the recording layer 104 is in the amorphous state, and the mark shape is distorted during rewriting. There is a work to prevent it.
- the light absorption correction layer 107 is preferably formed of a material having a high refractive index and appropriately absorbing light.
- the light absorption correction layer 107 can be formed using a material having a refractive index n of 3 or more and 6 or less and an extinction coefficient k force ⁇ or more and 4 or less.
- amorphous Ge alloys such as Ge-Cr and Ge-Mo
- amorphous Si alloys such as Si-Cr, Si-Mo and Si-W
- Te compounds such as SnTe and PbTe
- a material selected from crystalline metals, metalloids and semiconductor materials such as Ti, Hf, Nb, Ta, Cr, Mo, and W.
- the film thickness of the light absorption correction layer 107 is 20 ⁇ ! It is preferably ⁇ 50nm.
- the reflective layer 108 optically increases the amount of light absorbed by the recording layer 104, and thermally diffuses the heat generated in the recording layer 104 quickly to rapidly cool the recording layer 104. Has the function of facilitating crystallization. Further, the reflective layer 108 also has a function of protecting the multilayer film including the first dielectric layer 102 to the light absorption correction layer 107 from the use environment.
- the material of the reflective layer 108 is preferably a material having a large thermal conductivity and a small light absorption at the wavelength of the laser beam to be used. Specifically, the reflective layer 108 is formed using, for example, a material containing at least one selected from Al, Au, Ag, and Cu, or an alloy thereof.
- the above Al, Au, Ag And one or more elements selected from Cu and one or more other elements A material supplemented with element may be used. Specifically, Mg, Ca, Sc, Y, La, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Pd, Pt, Zn, Ga, In At least one element selected from C, Si, Ge, Sn, Sb, Bi, Te, Ce, Nd, Sm, Gd, Tb, and Dy force may be added.
- the addition concentration is preferably 3 atomic% or less.
- Materials with one or more of the above elements added include, for example, Al—Cr, Al—Ti, Al—Ni, Au—Cr, Ag—Pd, Ag—Pd—Cu, Ag—Pd—Ti, Ag — Nd, Ag— Nd— Au ⁇ Ag — Nd— Pd ⁇ Ag— In, Ag— In— Sn ⁇ Ag— In— Ga ⁇ Ag— In— Cu ⁇ Ag— Ga, Ag — Ga— Cu ⁇ Ag— Ga — Sn—Ag—Cu—Ag—Cu—Ni—Ag—Cu—Ca—Ag—Cu—Gd and alloy materials such as Ag—Zn—Al.
- the thickness of the reflective layer 108 is adjusted according to the linear velocity when recording information on the medium to be used and the composition of the recording layer 104. It is preferable to be in the range of ⁇ 300 nm. If it is thinner than 40 nm, the heat of the recording layer becomes diffused, and therefore the recording layer becomes amorphous, and if it is thicker than 300 nm, the heat of the recording layer becomes too diffused, and the recording sensitivity Decreases.
- the adhesive layer 109 is provided to adhere the dummy substrate 110 to the reflective layer 108.
- the adhesive layer 109 may be formed using a material having high heat resistance and high adhesiveness, for example, an adhesive resin such as an ultraviolet curable resin.
- the adhesive layer 109 may be formed of a material mainly composed of talyl resin or a material mainly composed of epoxy resin.
- a protective layer made of an ultraviolet curable resin and having a thickness of 1111 to 20111 may be provided on the surface of the reflective layer 108 before forming the adhesive layer 109.
- the thickness of the adhesive layer 109 is preferably 15 ⁇ m to 40 ⁇ m, more preferably 20 ⁇ m to 35 ⁇ m.
- the dummy substrate 110 increases the mechanical strength of the information recording medium 100 and protects the stacked body from the first dielectric layer 102 to the reflective layer 108.
- the preferred material of the dummy substrate 110 is the same as the preferred material of the substrate 101.
- the dummy substrate 110 and the substrate 101 are formed of substantially the same material and have the same thickness so as not to cause mechanical warping and distortion. It is preferable.
- the information recording medium 100 of the first embodiment is a single-sided structure disc having one recording layer.
- the information recording medium of the present invention may have two recording layers.
- the information recording medium having a double-sided structure can be obtained by laminating the layers laminated up to the reflective layer 108 in Embodiment 1 with the reflective layers 108 facing each other via the adhesive layer 109.
- the two laminates are bonded together by forming the adhesive layer 109 with a slow acting resin and using pressure and heat.
- a protective layer is provided on the reflective layer 108, a laminated body formed up to the protective layer is bonded with the protective layers facing each other to obtain a double-sided information recording medium.
- a method for manufacturing the information recording medium 100 of Embodiment 1 will be described.
- a substrate 101 on which guide grooves (group surface and land surface) are formed is placed in a film forming apparatus, and a first dielectric layer 102 is formed on the surface of the substrate 101 on which the guide grooves are formed.
- Step a Step of forming a film (Step a), Step of forming a first interface layer 103 (Step b), Step of forming a recording layer 104 (Step c), Step of forming a second interface layer 105 ( Step d), step of forming the second dielectric layer 106 (step e), step of forming the light absorption correction layer 107 (step f), and step of forming the reflective layer 108 (step g) It is manufactured by sequentially performing the steps of forming the adhesive layer 109 on the surface of the reflective layer 108 and bonding the dummy substrate 110.
- the term “surface” refers to the exposed surface (surface perpendicular to the thickness direction) when each layer is formed, unless otherwise specified. Shall.
- step a is performed in which the first dielectric layer 102 is formed on the surface of the substrate 101 where the guide groove is formed.
- Step a is performed by sputtering.
- Figure 5 shows an example of an apparatus for performing sputtering.
- the apparatus shown in FIG. 5 is an example of a bipolar glow discharge discharge type sputtering apparatus.
- the inside of the sputter chamber 39 is maintained at a high vacuum.
- the vacuum state is maintained by a vacuum pump (not shown) connected to the exhaust port 32.
- a sputter gas with a constant flow rate (for example, Ar gas) is introduced from the sputter gas inlet 33.
- a substrate 35 is attached to a substrate holder (anode) 34, a sputtering target (cathode) 36 is fixed to a target electrode 37, and the electrode 37 is connected to a power source 38.
- a glow discharge is generated.
- Ar positive ions are accelerated to impinge on the sputtering target 36.
- the released particles are deposited on the substrate 35 to form a thin film.
- the substrate 101 is attached as the substrate 35.
- This apparatus can be used to form other layers including a recording layer consisting of only a dielectric layer, and can also be used to produce other forms of media described below.
- Sputtering for forming the dielectric layer may be performed in a rare gas atmosphere or a mixed gas atmosphere of oxygen gas and Z or nitrogen gas and rare gas using a high frequency power source.
- a DC power supply may be used if possible.
- the rare gas may be any of Ar gas, Kr gas, and Xe gas.
- the sputtering target used in step a can be a single material selected from oxides, sulfides, selenium nitrides, nitrides, carbides, and fluorides, or a mixture of multiple materials. Can be used.
- the material and composition of the sputtering target is determined so that the first dielectric layer 102 having a desired composition can be formed.
- the composition of the sputtering target may not match the composition of the dielectric layer to be formed. In that case, the composition of the sputtering target is adjusted as appropriate. Further, when forming a dielectric layer containing an oxide, oxygen may be deficient during sputtering. Therefore, a sputtering target in which oxygen deficiency is suppressed may be used, or a small amount of oxygen of 5% by volume or less may be used. Sputtering may be performed in an atmosphere in which a gas is mixed with a rare gas.
- a layer made of (ZnS) (SiO 2) (mol%) is formed as the first dielectric layer 102.
- step a a sputtering target comprising (ZnS) (SiO 2) (mol%)
- Sputtering may be performed in an atmosphere in which 3% by volume of oxygen gas is mixed with Ar gas.
- step b is performed to form a first interface layer 103 on the surface of the first dielectric layer 102.
- Step b is also performed by sputtering.
- Sputtering may be performed using a high-frequency power source in a rare gas atmosphere or in a mixed gas atmosphere of oxygen gas and Z or nitrogen gas and a rare gas.
- a DC power supply may be used if possible.
- the rare gas may be any of Ar gas, Kr gas, and Xe gas.
- the sputtering target used in step b is selected from oxides, sulfides, selenium nitrides, nitrides, carbides, and fluorides. One material selected, or a mixture of materials can be used.
- the material and composition of the sputtering target are determined so that the first interface layer 103 having a predetermined composition can be formed.
- the composition of the sputtering target and the composition of the interface layer to be formed may not match.
- the composition of the sputtering target is adjusted as appropriate.
- oxygen may be deficient during sputtering, so a sputtering target that suppresses oxygen deficiency can be used, or a small amount of 5% or less.
- Sputtering may be performed in an atmosphere in which an oxygen gas is mixed with a rare gas.
- a layer may be formed.
- step b when a layer having Ge—Cr—N force is formed as the first interface layer 103, a sputtering target made of Ge—Cr is used in step b, and 40% nitrogen gas is added to the Ar gas. Reactive sputtering may be performed in an atmosphere mixed with the gas. Further, when forming a layer made of ZrO—SiO—CrO as the first interface layer 103, in step b, oxygen depletion is performed.
- Sputtering may be performed in an atmosphere.
- step c is performed to form the recording layer 104 on the surface of the first interface layer 103.
- Step c is also performed by sputtering.
- Sputtering may be performed using a DC power source in a rare gas atmosphere or in a mixed gas atmosphere of oxygen gas and Z or nitrogen gas and a rare gas.
- the rare gas may be Ar gas, Kr gas, or Xe gas. More specifically, the sputtering in step c may be performed in, for example, an Ar gas atmosphere or an atmosphere in which 5% or less of nitrogen gas is mixed with Ar gas.
- the sputtering target used in step c is manufactured by appropriately determining the ratio of Sn when Ge, Bi, Te, M, and Sn are included so that a film having a desired composition is formed. .
- the composition of the sputtering target may not match the composition of the recording layer to be formed. In that case, the composition of the sputtering target is appropriately adjusted so that the recording layer 104 having a desired composition can be obtained.
- the ratio (ie, concentration) of Ge, Bi, M, and Sn in the formed recording layer is the ratio of those in the sputtering target (ie, The Te ratio in the recording layer is slightly lower than the Te ratio in the target.
- the composition of the sputtering target to be used may have a slightly lower concentration of Ge, Bi, M, and Sn and a slightly higher concentration of Te than the desired recording layer composition.
- the composition of the sputtering target made of Ge—Sn—Ga—Bi—Te material is determined.
- a step of crystallizing the recording layer 104 may be performed as necessary after the medium is manufactured.
- the recording layer 104 may be formed by sputtering using a plurality of sputtering targets. For example, three types of sputtering, each consisting of GeTe, MTe, and BiTe forces
- a ring target may be attached to one sputtering chamber of the film forming apparatus and sputtering may be performed simultaneously. In that case, the sputtering power input to each sputtering target is adjusted so that the recording layer 104 containing the material having the composition represented by the above formula (1) is formed. Or four types of GeTe, SnTe, MTe, and Bi Te forces.
- the recording layer 104 containing a material having the composition represented by the above formula (2) may be formed using a sputtering target.
- a sputtering target each consisting of Ge, Bi, Al and Te
- a combination of sputtering targets each consisting of Ge, Bi, Te and In Te forces, or each of which is Ge. , Bi, Te
- the target may not necessarily be composed of a compound having a stoichiometric composition.
- Ge-Te, Sn-Te, Bi-Te, In-Te, Ga-Te, Al-Te-based materials Each target may also be used.
- step d is performed to form a second interface layer 105 on the surface of the recording layer 104.
- Step d is performed in the same way as step b.
- the second interface layer 105 may be formed using a sputtering target having the same material strength as that of the first interface layer 103, or may be formed using a sputtering target made of a different material.
- step e is performed to form a second dielectric layer 106 on the surface of the second interface layer 105.
- Step e is performed in the same manner as step a.
- the second dielectric layer 106 may be formed using a sputtering target having the same material force as that of the first dielectric layer 102 or may be formed using a sputtering target having a different material force. .
- step f is performed to form a light absorption correction layer 107 on the surface of the second dielectric layer 106.
- sputtering is performed using a direct current power source or a high frequency power source.
- sputtering includes amorphous Ge alloys such as Ge—Cr and Ge—Mo, amorphous Si alloys such as Si—Cr, Si—Mo and Si—W, and Te such as SnTe and PbTe.
- a target consisting of material materials selected from Ti, Hf, Nb, Ta, Cr, Mo and W, and other crystalline metals, metalloids and semiconductor materials Is preferred.
- Sputtering should be performed in a rare gas atmosphere.
- the composition of the sputtering target and the composition of the light absorption correction layer to be formed may not match.
- the composition of the sputtering target is adjusted appropriately to correct the light absorption of the desired composition. Try to get layer 107.
- Step g is performed to form the reflective layer 108 on the surface of the light absorption correction layer 107.
- Step g is performed by sputtering.
- Sputtering is performed in an Ar gas atmosphere using a DC power source or a high-frequency power source.
- a sputtering target made of Al, A1 alloy, Au, Au alloy, Ag, Ag alloy, Cu, or Cu alloy may be used.
- an Ag—Pd—Cu sputtering target may be used.
- the composition of the sputtering target and the composition of the reflective layer to be formed may not match!
- the composition of the sputtering target is adjusted to obtain the reflective layer 108 having a desired composition.
- steps a to g are also sputtering steps. Therefore, steps a to g may be performed continuously by sequentially changing the target in one sputtering apparatus. Alternatively, steps a to g may be performed using independent sputtering apparatuses.
- the substrate 101 on which the first dielectric layer 102 to the reflective layer 108 are sequentially stacked is taken out from the sputtering apparatus. Then, an ultraviolet ray curable resin is applied to the surface of the reflective layer 108 by, for example, a spin coating method. The dummy substrate 110 is brought into close contact with the applied ultraviolet curable resin, and ultraviolet rays are also applied to the side of the dummy substrate 110 to cure the resin, thereby completing the bonding process.
- the initialization process is a process of crystallizing the amorphous recording layer 104 by irradiating, for example, a semiconductor laser and raising the temperature above the crystallization temperature.
- the initialization process may be performed before the bonding process.
- the information recording medium 100 of Embodiment 1 can be manufactured by sequentially performing the steps a to g, the adhesive layer forming step, and the dummy substrate bonding step.
- Figure 2 shows a partial cross section of the optical information recording medium.
- a reflective layer 207 is formed on one surface of a substrate 208, a second dielectric layer 206 is formed on the surface of the reflective layer 207, and a second dielectric is formed.
- a second interface layer 205 is formed on the surface of the layer 206, a recording layer 204 is formed on the surface of the second interface layer 205, a first interface layer 203 is formed on the surface of the recording layer 204, and A first dielectric layer 202 is formed on the surface of one interface layer 203, and a cover layer 201 is further formed.
- the information recording medium having this configuration can be used as a 25 GB Blu-ray Disc that records and reproduces information with a laser beam in the blue-violet region near a wavelength of 405 nm.
- Information recording medium with this configuration Laser light 209 is also incident on the body 200 as the side force of the cover layer 201, whereby information is recorded and reproduced.
- the recording layer 204 will be described first, and then other elements will be described.
- the recording layer 204 has a function similar to that of the recording layer 104 in the first embodiment. Further, the material contained in the recording layer 204 is preferably a material represented by the above formula (3) or the above formula (4) as in the recording layer 104 in the first embodiment. The material represented by the above formula (3) or formula (4) is also represented by the above formula (1) or formula (2), respectively, as described in connection with the first embodiment.
- this medium can be used as a Blu-ray Disc. Therefore, as described in Embodiment 1, x (that is, the ratio of GeTe) in the formula (1) preferably satisfies 85 ⁇ x ⁇ 98, more preferably 91 ⁇ x ⁇ 98, Is preferably within this range, y is preferably 0.5 or less. In the formula (2), X preferably satisfies 85 ⁇ x ⁇ 98, more preferably 91 ⁇ x ⁇ 98.
- the film thickness of the recording layer 204 is preferably in the range of 5 nm to 15 nm, more preferably 8 ⁇ ! Within the range of ⁇ 12nm. Problems when the film thickness of the recording layer 204 is too thin and when it is too thick are as described in connection with the first embodiment.
- the substrate 208 is a disk-like plate that is transparent and has a smooth surface.
- Substrate 208 is formed using the same materials as described in connection with Embodiment 1 above, and is preferably formed of polycarbonate. In the illustrated embodiment, a substrate 208 having a thickness of about 1. lmm and a diameter of 120 mm is preferably used.
- a guide groove for guiding laser light may be formed on the surface of the substrate 208 on the side where the reflective layer and the recording layer are formed. When the guide groove is formed on the substrate, the surface on the side closer to the laser beam 209 also becomes the “group surface” and the surface on the side farther from the laser beam force also becomes the “land surface”.
- the step difference between the group surface and the land surface is preferably 10 nm to 30 nm.
- the distance between groove groups (from the center of the group surface to the center of the group surface) is about 0.32 ⁇ m.
- recording is performed only on the group side. That is, the group recording method is adopted in the Blu-ray Disc.
- the reflective layer 207 has a function similar to that of the reflective layer 108 in Embodiment 1.
- the material suitable for constituting the reflective layer 2007 and the thickness of the reflective layer 207 are as described above in relation to the reflective layer 108 of the medium of the first embodiment.
- the first dielectric layer 202 and the second dielectric layer 206 are made of the same material as that constituting the first dielectric layer 102 and the second dielectric layer 106 in Embodiment 1, that is, , Oxides, sulfides, selenium nitrides, nitrides or fluorides, or mixtures thereof.
- the dielectric layer is formed of a material that can ensure high transparency even for light in a short wavelength region. More preferably. Therefore, the material constituting the dielectric layer preferably contains at least an oxide.
- Examples of the oxides constituting the first dielectric layer 202 and the second dielectric layer 206 include AlO, CeO, CrO, GaO, HfO, InO, LaO, and MgO. , SiO, SnO, Ta O
- TiO, Y 2 O, ZnO, ZrO and the like are preferably used.
- the selenide is, for example, ZnSe.
- nitride for example, A1N, BN, Ge—N, SiN and the like are preferably used.
- fluorides include CeF, DyF, ErF,
- Examples include GdF, HoF, LaF, NdF, YF, and YbF. As a mixture
- ZnS 2 -SiO is amorphous and has high transparency and low thermal conductivity.
- ZnS-SiO is (ZnS) (SiO 2) (mol%)
- the first and second dielectric layers 202 and 206 may be formed of a material not containing Zn and Z or S. In that case, the preferred materials constituting these dielectric layers are ZrO-SiO-CrO-LaF, ZrO-SiO-GaO.
- the dielectric layer may contain M oxide contained in the recording layer, that is, M 2 O.
- the reflective layer 207 includes Ag or an Ag alloy
- the second induction is performed so that Ag S does not occur.
- the electrical conductor layer 206 is preferably formed of a material containing no S.
- an insulating layer containing no sulfide may be provided between the reflective layer 207 and the second dielectric layer 206.
- the first dielectric layer 202 and the second dielectric layer are set so as to satisfy 15% ⁇ Rc and Ra ⁇ 5%.
- the optical path length nd of the body layer 206 can be determined strictly by calculation based on the matrix method.
- the thickness of the first dielectric layer 202 is The thickness is preferably 10 nm to 100 nm, more preferably 30 nm to 70 ⁇ m.
- the thickness of the second dielectric layer 206 is preferably 3 nm to 50 nm, and more preferably 5 nm to 40 nm.
- first interface layer 203 and the second interface layer 205 Materials suitable for forming the first interface layer 203 and the second interface layer 205 are the first interface layer 103 and the second interface layer 105 of the medium of the first embodiment. This is as explained in the related section. Similarly, the film thickness is preferably lnm to 10nm 2 ⁇ ! ⁇ 7nm It is more preferable.
- first dielectric layer 202 and / or the second dielectric layer 206 is formed of a material that does not contain any of Zn and S, the first interface layer 203 and / or the second dielectric layer 206 is formed.
- the second interface layer 205 may not be provided.
- the cover layer 201 As a method of increasing the recording density of the information recording medium, there is a method of increasing the numerical aperture NA of the objective lens so that the laser beam can be narrowed using a short wavelength laser beam. In this case, since the focal position becomes shallow, the cover layer 201 positioned on the laser beam incident side is designed to be thinner than the substrate 101 of the first embodiment. According to this configuration, it is possible to obtain a large-capacity information recording medium 200 capable of higher density recording.
- the cover layer 201 is a disc or sheet that is transparent and has a smooth surface, like the substrate 208.
- the thickness of the cover layer 201 is preferably 50 m to 120 m, more preferably 80 / z m to L 10 m.
- the cover layer 201 may be composed of, for example, a disc-shaped sheet and an adhesive layer, or may be composed of a single layer of ultraviolet curable resin such as acrylic resin or epoxy resin. Further, the cover layer 201 may be provided on the surface of the first dielectric layer 202 with a protective layer provided on the surface of the protective layer.
- the cover layer 201 may have any configuration, but the total thickness (for example, the thickness of the sheet + the thickness of the adhesive layer + the thickness of the protective layer, or the single layer of the UV curable resin)
- the cover layer is preferably designed so that the thickness) is 50 m to 120 ⁇ m.
- the sheet constituting the cover layer is preferably formed of a resin such as polycarbonate, amorphous polyolefin, or PMMA, particularly preferably polycarbonate.
- the cover layer 201 is positioned on the laser beam 209 incident side, it is preferable that the birefringence in the short wavelength region is small optically! /.
- the substrate 208 serving as a support for forming each layer is located on the opposite side to the laser light incident side, the information is recorded on the substrate 208 from the reflective layer 207, contrary to the information recording medium 100. It will be formed in order.
- the substrate 208 on which guide grooves (group surface and land surface) are formed is placed in a film forming apparatus, and the reflective layer 207 is formed on the surface of the substrate 208 on which the guide grooves are formed.
- Step h Step of depositing the second dielectric layer 206 (Step i), Second field
- step j The step of forming the surface layer 205 (step j), the step of forming the recording layer 204 (step k), the step of forming the first interface layer 203 (step 1), and the first dielectric layer 202
- the film is manufactured by sequentially performing the film forming process (process m) and then performing the process of forming the cover layer 201 on the surface of the dielectric layer 202.
- step h of forming the reflective layer 207 is performed on the surface of the substrate 208 on which the guide groove is formed. Step h is performed in the same manner as step g in the first embodiment.
- step i is performed to form a second dielectric layer 206 on the surface of the reflective layer 207.
- Step i is performed in the same manner as step a of the first embodiment.
- step j is performed to form a second interface layer 205 on the surface of the second dielectric layer 206.
- Step j is performed in the same manner as step b of the first embodiment.
- Step k is performed to form the recording layer 204 on the surface of the second interface layer 205.
- Step k is performed in the same manner as step c in the first embodiment.
- the composition of the 06-81-cho 6-111 series material contained in the recording layer 204 is Ge Bi Te In it can be expressed as (atomic 0/0). You can get this composition
- the composition of the Ge—Sn—Bi—Te—1 puttering target is determined so that the desired composition can be obtained.
- Step 1 is performed to form a first interface layer 203 on the surface of the recording layer 204.
- step b of the first embodiment is performed in the same manner as step b of the first embodiment.
- Step m is performed to form a first dielectric layer 202 on the surface of the first interface layer 203.
- Step m is performed in the same manner as step a of the first embodiment.
- steps ! to m are V, and the deviation is also a sputtering step. Therefore, the steps h to m may be performed continuously by sequentially changing the target in one sputtering apparatus. Alternatively, steps ! to m may be performed using independent sputtering apparatuses.
- the cover layer 201 After depositing the first dielectric layer 202 Then, the substrate 208 sequentially laminated from the reflective layer 207 to the first dielectric layer 202 is taken out from the sputtering apparatus. Then, an ultraviolet curable resin is applied to the surface of the first dielectric layer 202 by, for example, a spin coating method.
- the cover layer 201 can be formed by bringing a disk-shaped sheet into close contact with the applied ultraviolet curable resin and irradiating the ultraviolet light from the sheet side to cure the resin.
- the cover layer 201 having a thickness of 100 m is formed.
- the surface of the first dielectric layer 202 is coated with an ultraviolet curable resin having a thickness of 100 m, for example, by spin coating, and the resin is irradiated with ultraviolet rays to cure the resin.
- Layer 201 can also be formed. In this way, the cover layer forming step is completed.
- an initialization step is performed as necessary.
- the initialization process is performed in the same manner as in the first embodiment.
- the information recording medium 200 of the second embodiment can be manufactured by sequentially performing the steps h to m and the cover layer forming step.
- FIG. 3 shows a partial cross section of the optical information recording medium.
- the information recording medium 300 shown in FIG. 3 has a configuration in which a substrate 315, a second information layer 316, an intermediate layer 308, a first information layer 317, and a cover layer 301 are arranged in this order.
- the second information layer 316 includes a second reflective layer 314, a fifth dielectric layer 313, a third interface layer 312, a second recording layer 311, and a second layer on one surface of the substrate 315.
- the interface layer 310 and the fourth dielectric layer 309 are arranged in this order.
- the intermediate layer 308 is formed on the surface of the fourth dielectric layer 309.
- the first information layer 317 includes a third dielectric layer 307, a first reflective layer 306, a second dielectric layer 305, a first recording layer 304, and a first interface on the surface of the intermediate layer 308.
- a layer 303 and a first dielectric layer 302 are arranged in this order.
- the laser beam 318 is incident on the side force of the cover layer 301.
- the second information layer 316 information is recorded / reproduced by the laser beam 318 that has passed through the first information layer 317.
- information recording medium 300 information can be recorded on each of the two recording layers. Therefore, according to this configuration, a medium having a capacity about twice that of the second embodiment can be obtained. Specifically, for example Thus, it is possible to obtain an information recording medium having a capacity of 50 GB that uses a laser beam in the blue-violet region near the wavelength of 405 nm for recording and reproduction.
- the second recording layer 311 has the same function as the recording layer 204 in Embodiment 2, and the material and the preferred film thickness are the same as those of the recording layer 204.
- the first recording layer 304 has the same function as the recording layer 204 in Embodiment 2, and is formed using the same material.
- the thickness of the first recording layer 304 is preferably smaller than that of the second recording layer 311. This is because the first information layer 317 needs to be designed to have a high transmittance so that the laser light 318 can reach the second information layer 316.
- the light transmittance of the first information layer 317 when the first recording layer 304 is in the crystalline phase is Tc (%), and the first information layer 317 is in the amorphous phase when the first recording layer 304 is in the amorphous phase.
- the thickness of the first recording layer 304 is preferably 3 nm to 9 nm, and more preferably 5 nm to 7 nm so as to have such light transmittance.
- the substrate 315 is similar to the substrate 208 of the second embodiment. Therefore, detailed description of the substrate 315 is omitted here.
- the reflective layer 314 is the same as the reflective layer 108 in the first embodiment. Therefore, detailed description of the reflective layer 314 is omitted here.
- the fifth dielectric layer 313 and the fourth dielectric layer 309 are formed using the same material as that of the second dielectric layer 206 and the first dielectric layer 202 in the second embodiment. be able to.
- the signal recorded in the second information layer 316 is reproduced by reading the laser light that has passed through the first information layer 317 and reflected by the second reflective layer 2. Therefore, the reflectance Rc of the second information layer is preferably 18% ⁇ Rc.
- the thickness of the fourth dielectric layer 309 is preferably 20 nm to 100 nm, and more preferably 30 nm to 70 nm.
- the thickness of the fifth dielectric layer 313 is preferably 3 nm to 40 nm, and more preferably 5 nm to 30 nm.
- the second interface layer 310 and the third interface layer 312 are the same as the first interface layer 103 and the second interface layer 105 in the first embodiment. So here the second and A detailed description of the third interface layer is omitted. If the fifth dielectric layer 313 and Z or the fourth dielectric layer 309 is formed of a material that does not include any deviation of Zn and S, the third interface layer 312 and Z or the second dielectric layer 309 The interface layer 310 is not necessarily provided.
- the intermediate layer 308 has a function of sufficiently separating the focal position of the laser light 318 in the first information layer 317 and the focal position in the second information layer 316.
- a guide groove for the first information layer 317 may be formed as necessary.
- the intermediate layer 308 can be formed of an ultraviolet curable resin.
- the intermediate layer 308 is desirably transparent to light having a wavelength ⁇ to be recorded / reproduced so that the laser beam 318 efficiently reaches the second information layer 316.
- the thickness of the intermediate layer 308 is not less than (i) the depth of focus determined by the numerical aperture of the objective lens and the wavelength of the laser beam, and (ii) between the first recording layer 304 and the second recording layer 311.
- the distance is within the range where the object lens can collect light, and (iii) the thickness of the cover layer 301 is selected so that the objective lens used is within the allowable substrate thickness tolerance. Therefore, the thickness of the intermediate layer 308 is preferably 10 111 to 40 111.
- the intermediate layer 308 may be formed by stacking a plurality of resin layers as necessary.
- the intermediate layer 308 may have a two-layer structure including a layer that protects the dielectric layer 309 and a layer having a guide groove.
- the third dielectric layer 307 has a function of increasing the light transmittance of the first information layer 317. Therefore, the material of the third dielectric layer 307 is preferably transparent and has a high refractive index. As such a material, for example, TiO can be used. Or 90mo TiO
- a material containing 1% or more may be used. Thereby, a layer having a large refractive index of about 2.7 is formed.
- the film thickness of the third dielectric layer 307 is preferably 10 nm to 40 nm.
- the first reflective layer 306 has a function of quickly diffusing the heat of the first recording layer 304.
- the material and thickness of the first reflective layer 306 are more limited.
- the first reflective layer 306 is preferably designed to be thinner.
- the first reflection layer 306 is preferably designed so that the extinction coefficient is small and the thermal conductivity is large.
- the first reflective layer 306 is preferably made of Ag or an Ag alloy so as to have a thickness of 5 nm to 15 nm. If the film thickness is thinner than 5 nm, the function of diffusing heat is reduced and marks are formed on the first recording layer 304. Formed. Further, if the film thickness is greater than 15 nm, the light transmittance of the first information layer 317 is less than 45%.
- the first dielectric layer 302 and the second dielectric layer 305 have a function of adjusting Rc, Ra, Tc and Ta of the first information layer 317 by adjusting the optical path length nd.
- the optical path length nd of the first dielectric layer 302 and the second dielectric layer 305 is set to a matrix method so that 45% ⁇ (Ta + Tc) Z2, 5% ⁇ Rc, and Ra ⁇ l%. It can be determined strictly by calculation based on.
- the thickness of the first dielectric layer 302 is preferably 10 nm.
- the thickness of the second dielectric layer 305 is preferably 3 nm to 40 nm, more preferably 5 nm to 30 nm.
- the materials forming these dielectric layers may be the same as those of the second and first dielectric layers 206 and 202 in the second embodiment.
- the second dielectric layer 305 preferably does not contain S.
- the first and second dielectric layers 302 and 305 preferably include at least an oxide. ZrO—SiO—CrO—LaF, ZrO as materials for the first and second dielectric layers 302 and 305
- the first dielectric layer 302 may be formed using ZnS—SiO.
- the first interface layer 303 is the same as the interface layer 103 in the first embodiment. Therefore, the detailed explanation is omitted here.
- the first dielectric layer 302 is made of a material that does not include V and deviation of Zn and S
- the first interface layer 303 may not be provided.
- no interface layer is provided between the second dielectric layer 305 and the first recording layer 304. This is because the second dielectric layer 305 is preferably made of a material that does not include any deviation of Zn and S.
- the cover layer 301 has the same function as the cover layer 201 of the second embodiment, and is made of the same material force.
- a preferable film thickness of the cover layer 301 is 40 m to 100 m.
- Ma The thickness of the cover layer 301 is set so that the distance force from the surface of the cover layer 301 to the second recording layer 311 is 50 m to 120 m.
- the thickness of the intermediate layer 308 is 15 m
- the thickness of the cover layer 301 may be 85 m.
- the thickness force S of the intermediate layer 308 is S25 ⁇ m
- the thickness of the cover layer 301 may be 75 ⁇ m.
- the thickness force S of the intermediate layer 308 is S35 ⁇ m
- the thickness of the cover layer 301 may be 65 ⁇ m.
- an information recording medium having two information layers having a recording layer has been described.
- the information recording medium having a plurality of recording layers is not limited to this configuration, and may have a configuration including three or more information layers.
- one of the two information layers is one of the specific Ge—Bi—Te—M-based material or Ge—Sn—Bi-Te— that generates a reversible phase change.
- An information layer having a recording layer containing an M-based material may be used, and one may be an information layer having a recording layer that causes an irreversible phase change.
- one of the three information layers is a read-only information layer, and one is a specific Ge-Bi-Te-M that generates a reversible phase change. It is also possible to use an information layer having a recording layer containing a Zn-based material or a Ge—Sn—Bi-Te-M-based material and one information layer having a recording layer that causes irreversible phase change. As described above, there are various types of information recording media having two or more information layers. In any form, the recording layer that causes a reversible phase change is formed into a layer containing a material represented by the above formula (1) or formula (2), or the formula (3) or formula (4).
- a recording layer having a high speed and excellent stability of the amorphous phase can be obtained. That is, an information recording medium in which at least one recording layer includes the above-mentioned specific material is used when information is recorded at an arbitrary linear velocity selected from a high linear velocity and a wide linear velocity range. High erasure performance and excellent record retention.
- the information recording medium 300 is manufactured by sequentially forming a second information layer 316, an intermediate layer 308, a first information layer 317, and a cover layer 301 on a substrate 315 serving as a support.
- Step n) forming a fifth dielectric layer 313 (step), and forming a third interface layer 312
- step p step of forming the second recording layer 311 (step q)
- step q step of forming the second interface layer 310 (step! :)
- step s step of forming an intermediate layer 308 on the surface of the fourth dielectric layer 309 is performed, and the force is also applied to the surface of the intermediate layer 308.
- Step t the step of forming the first reflective layer 306 (step u), the step of forming the second dielectric layer 305 (step V), and the first recording layer 304
- the step of forming a film (step w), the step of forming the first interface layer 303 (step x), and the step of forming the first dielectric layer 302 (step y) are sequentially performed.
- the first dielectric layer 302 is manufactured by performing the step of forming the cover layer 301 on the surface of the first dielectric layer 302.
- step n of forming the second reflective layer 314 on the surface of the substrate 315 on which the guide groove is formed is performed.
- Step n is performed in the same manner as step g in the first embodiment.
- step o is performed to form a fifth dielectric layer 313 on the surface of the second reflective layer 314.
- step o is performed in the same manner as step a of the first embodiment.
- step p is performed to form a third interface layer 312 on the surface of the fifth dielectric layer 313.
- step p is performed in the same manner as step b of the first embodiment.
- step q is performed to form a second recording layer 311 on the surface of the third interface layer 312.
- Step q is performed in the same manner as step k in the second embodiment (that is, step c in the first embodiment).
- step r is performed to form a second interface layer 310 on the surface of the second recording layer 311.
- step r is performed in the same manner as step b in the first embodiment.
- step s is performed to form a fourth dielectric layer 309 on the surface of the second interface layer 310. Step s is performed in the same manner as step a of the first embodiment.
- the substrate 315 on which the second information layer 316 is formed by the steps n to s is also taken out by the sputtering apparatus force, and the intermediate layer 308 is formed.
- the intermediate layer 308 is formed by the following procedure. First, an ultraviolet curable resin is applied to the surface of the dielectric layer 309 by, for example, spin coating. Next, the concavo-convex surface of the polycarbonate substrate having concavo-convex complementary to the guide groove to be formed in the intermediate layer is brought into close contact with the ultraviolet curable resin. In this state, the resin is hardened by irradiating ultraviolet rays, and then the polycarbonate substrate having unevenness is peeled off.
- a guide groove having a shape complementary to the unevenness is formed in the ultraviolet curable resin, and an intermediate layer 308 having a guide groove to be formed is formed.
- Guide groove formed on substrate 315 and intermediate layer 308 The shape of the guide grooves formed may be the same or different.
- the intermediate layer 308 may be formed by forming a layer that protects the dielectric layer 309 from an ultraviolet curable resin and forming a layer having guide grooves thereon. In that case, the resulting intermediate layer has a two-layer structure.
- the intermediate layer may be formed by stacking three or more layers.
- the substrate 315 formed up to the intermediate layer 308 is placed again in the sputtering apparatus, and the first information layer 317 is formed on the surface of the intermediate layer 308.
- the step of forming the first information layer 317 corresponds to steps t to y.
- Step t is a step of forming the third dielectric layer 307 on the surface of the intermediate layer 308 having the guide grooves.
- a high frequency power source is used and a sputtering unit containing TiO material is used.
- sputtering can be performed using a pulse generation type DC power source.
- step u is performed to form a first reflective layer 306 on the surface of the third dielectric layer 307.
- a direct current power source is used, and sputtering is performed in a rare gas atmosphere using a sputtering target of an alloy containing Ag.
- Step V is performed to form a second dielectric layer 305 on the surface of the first reflective layer 306.
- Step V is performed in the same manner as step a of the first embodiment.
- step w is performed to form a first recording layer 304 on the surface of the second dielectric layer 305.
- Step w is performed in the same manner as step k of the second embodiment.
- Step X is performed to form a first interface layer 303 on the surface of the first recording layer 304.
- Process X is performed in the same manner as process b in the first embodiment.
- step y is performed to form a first dielectric layer 302 on the surface of the first interface layer 303.
- Step y is performed in the same manner as step a of the first embodiment. In this manner, the steps t to y are sequentially performed to form the first information layer 317.
- a cover layer 301 is formed on the surface of the first dielectric layer 302 by the same method as that described in the second embodiment.
- a cover layer 301 having a thickness of 75 m can be formed by forming a UV curable resin serving as an adhesive so as to have a thickness of 10 / zm and laminating sheets having a thickness of 65 m.
- an ultraviolet curable resin having a thickness of 75 m is applied to the surface of the dielectric layer 302, for example.
- the cover layer 301 can also be formed by coating by spin coating and irradiating ultraviolet rays to cure the resin. In this way, the cover layer forming step is completed.
- an initialization step of the second information layer 316 and the first information layer 317 is performed as necessary.
- the initialization process may be performed on the second information layer 316 before or after forming the intermediate layer 308, and may be performed on the first information layer 317 before or after forming the cover layer 301.
- the initialization process may be performed on the first information layer 317 and the second information layer 316 before or after the cover layer 301 is formed.
- the information recording of the embodiment 3 is performed by sequentially performing the steps n to s, the intermediate layer forming step, the steps t to y, and the cover layer forming step, and performing the initialization step as necessary.
- Medium 300 can be manufactured.
- FIG. 4 shows a partial cross section of the information recording medium 400 and an example of a system using the same.
- the information recording medium 400 is so-called memory.
- the recording layer 403 is a layer that can cause a reversible phase change between a crystalline phase and an amorphous phase by Joule heat generated by applying electrical energy. Or (2) or a material represented by the above formula (3) or (4).
- the substrate 401 a semiconductor substrate such as a Si substrate, or an insulating substrate such as a polycarbonate substrate, a SiO substrate, and an Al 2 O substrate can be used.
- Lower electrode 402 a semiconductor substrate such as a Si substrate, or an insulating substrate such as a polycarbonate substrate, a SiO substrate, and an Al 2 O substrate.
- the upper electrode 404 is formed of a suitable conductive material.
- the lower electrode 402 and the upper electrode 404 are formed by sputtering a metal such as Au, Ag, Pt, Al, Ti, W, and Cr, and mixtures thereof.
- This information recording medium 400 will be further described along with its operation method in the embodiments described later.
- Embodiment 5 of the present invention information was recorded on the information recording medium of the present invention and recorded.
- An example of an apparatus for reproducing information will be described.
- Figure 6 shows an example of a recording / playback device.
- the recording / reproducing apparatus includes a spindle motor 51 that rotates the information recording medium 50, an optical head 54 that includes a semiconductor laser 53 that emits laser light 52, and the laser light 52 is condensed on the recording layer of the information recording medium 50. And an objective lens 55 to be used.
- the information recording medium 50 is, for example, the information recording medium 100, 200, 300 described above.
- the laser beam 52 corresponds to the laser beams 111, 209, and 318 shown in FIGS.
- Example 1 an information recording medium of DVD-RAM specification was produced and experimented. Specifically, the information recording medium 100 shown in FIG. 1 was manufactured, and recording / reproduction evaluation and reliability evaluation were performed. In this example, three types of information recording media (medium numbers 100-1 to 3) represented by the above formula (3) and having different M are prepared as materials constituting the recording layer 104. Produced. For comparison, the recording layer 104 also has a material force that does not have M (that is, M Te).
- a medium 100 (Comparative Example; medium number 100-A) was also prepared. Recording / reproduction evaluation and reliability evaluation were performed at 5x and 16x speeds. The production method and evaluation method will be specifically described below.
- the substrate 101 As the substrate 101, a polycarbonate substrate (diameter 120mm, thickness 0.6mm) with guide grooves (depth 50nm, distance between groove lands 0.615m) was prepared. It was installed in the sputtering apparatus.
- a layer made of (ZrO 2) (SiO 2) (Cr 2 O 3) (mol%) is 5 nm thick
- the recording layer 104 was laminated by sputtering so as to have a thickness of 7 nm.
- the recording layer 104 is substantially made of a material represented by (GeTe) [(M Te) (Bi Te)] (mol%).
- Ge— Bi— Te with the proportions of Ge, Bi, Te and M adjusted so that a layer consisting of —It was formed using a target with M force.
- Media number 100-1 has M as A1
- media number 100-2 has M as Ga
- media number 100-3 has M as In.
- the recording film of the above composition is formed is formed on the glass plate by forming a 500 nm thick film on 10 glass plates under the sputtering conditions for forming the recording layer.
- Element composition force (GeTe) [(M Te) (Bi Te)] force is also calculated
- composition of the sputtering target is the above-mentioned element in which the elemental composition of the film formed on 10 glass plates as described above is calculated from the formula (GeTe) [(M Te) (Bi Te)].
- the second interface layer 105 is formed on the recording layer 104 as (ZrO 2) (SiO 2) (Cr 2 O 3) (mo
- force layer is formed to a thickness of 5 nm, and the second dielectric layer 106 is (ZnS)
- a layer made of (SiO 2) (mol%) was formed to a thickness of 35 nm, and the light absorption correction layer 107
- a layer of Si Cr is formed to a thickness of 30 nm.
- a layer of Ag-Pd-Cu force was formed to a thickness of 80 nm.
- the first dielectric layer 102 and the second dielectric layer 106 are made of (ZnS) (SiO 2) (mol%) having a diameter of 100 mm and a thickness of 6 mm.
- the first interface layer 103 and the second interface layer 105 have a diameter of 100 mm and a thickness of 6 mm (ZrO 2) (SiO 2
- Sputtering was performed in a gas atmosphere using a high frequency power source at an output of 500 W.
- the recording layer 104 is a sputtering target containing Ge, Te, Bi and M having a diameter of 100 mm and a thickness of 6 mm, and is sputtered at a power of 100 W using a DC power source in an Ar gas atmosphere at a pressure of 0.13 Pa.
- the light absorption correction layer 107 was formed by sputtering using a sputtering target containing Si and Cr having a diameter of 100 mm and a thickness of 6 mm in an Ar gas atmosphere at a pressure of 0.27 Pa using a high frequency power source with an output of 300 W.
- the reflective layer 108 was formed by sputtering using a sputtering target made of Ag—Pd—Cu with a diameter of 100 mm and a thickness of 6 mm using a direct current power source with an output of 200 W in an Ar gas atmosphere with a pressure of 0.4 Pa. .
- the recording layer 104 of medium number 100-A was formed by sputtering under the same conditions using a target containing Ge, Bi, and Te.
- the first dielectric layer 102, the first interface layer 103, the recording layer 104, the second interface layer 105, the second dielectric layer 106, and the light absorption correction are formed on the substrate 101.
- the layer 107 and the reflective layer 108 are sequentially formed to form a laminate, and then an ultraviolet curable resin is applied on the reflective layer 108, and the dummy substrate 110 is applied on the applied ultraviolet curable resin.
- a disc-shaped polycarbonate substrate having a diameter of 120 mm and a thickness of 0.6 mm was adhered.
- the resin was cured by irradiating ultraviolet rays from the dummy substrate 110 side.
- the adhesive layer 109 made of cured resin was formed with a thickness of 30 m, and at the same time, the dummy substrate 110 was bonded to the laminate through the adhesive layer 109.
- an initialization process was performed.
- the recording layer 104 of the information recording medium 100 was crystallized over almost the entire surface in an annular region having a radius of 22 to 60 mm using a semiconductor laser having a wavelength of 810 nm.
- the initialization process was completed, and the production of the information recording medium 100 with medium numbers 100-1 to 3 and medium number 100-A was completed. All of the produced media had a mirror surface reflectance of about 16% Rc and about 2% Ra.
- a spindle motor that rotates the information recording medium 100, an optical head including a semiconductor laser that emits laser light 111, and the laser light 111 on the recording layer 104 of the information recording medium 100
- the recording / reproducing apparatus having the configuration shown in FIG.
- a wavelength of 66 Using an Onm semiconductor laser and an objective lens with a numerical aperture of 0.65, recording equivalent to 4.7 GB capacity was performed.
- the number of revolutions for rotating the information recording medium 100 was set in the range of 9000 revolutions Z to 11000 revolutions Z.
- the recording / reproduction evaluation is based on the jitter value (an index for statistically evaluating how far a recording mark of a predetermined length is formed from a predetermined position) and the erasure rate (the crystallization speed of the recording layer). Based on an index that evaluates
- the peak power (Pp) and the bias power (Pb) were set according to the following procedure. Random signals with a mark length ranging from 0.42 m (3T) to 1.96 m (14T) by irradiating the laser beam 111 toward the information recording medium 100 while performing power modulation between a high power level and a low power level. was recorded 10 times on the same group surface of the recording layer 104 (by group recording). At that time, non-multipulse laser light was irradiated.
- the jitter value between the front ends and the jitter value between the rear ends were measured using a time interval analyzer, and an average jitter value was obtained as an average value of these values.
- the average jitter value was measured for each recording condition with the bias power fixed at a fixed value and the peak power varied, and the peak power was gradually increased.
- the average jitter value of the random signal reached 13%. I decided that Ppl was 1.3 times the power of the peak power.
- the average jitter value was measured for each recording condition with the peak power fixed at Ppl and the bias power varied, and the upper limit of the noise power when the average jitter value of the random signal was 13% or less.
- the average value and the lower limit were set to Pb.
- the average jitter value was measured for each recording condition with the noise power fixed at Pb, and the peak power was variously changed. The peak power was gradually increased, and the average jitter value of the random signal reached 13%.
- the power of 1.3 times the peak power was set to Pp.
- Pp and Pb are set for each of group recording and land recording performed at 16x speed and 5x speed respectively. (That is, Rp and Pb were set under four recording conditions).
- the results are shown in Table 1.
- When recording under the conditions of Pp and Pb set in this way for example, 10 times repeated recording !, 16 ⁇ speed recording and 5 ⁇ speed recording respectively! /, Average jitter value of 8-9% was gotten.
- a method for measuring the erasure rate While power-modulating between Pp and Pb, a single 3T signal and a single 11T signal were recorded a total of 10 times. The 3T signal was recorded for the 11th time, and the signal amplitude (unit: dBm) of the 3T signal was measured using a spectrum analyzer. Next, the 11T signal was recorded at the 12th time to measure how much the 3T signal was attenuated. This attenuation is defined as the erasure rate (unit: dB). The larger the erasure rate, the faster the crystallization speed of the recording layer. The value is preferably 25 dB or more. Since the erasure rate decreased as the linear velocity increased, the group recording and land recording were performed at 16 times speed.
- the reliability evaluation was conducted to examine whether the recorded signal was preserved even under high temperature conditions, and whether it could be rewritten after being subjected to high temperature conditions.
- the evaluation was performed using the same recording / reproducing apparatus as described above.
- the specific evaluation method is as follows. First, in advance, a random signal is subjected to multiple tracks on groups and lands on the above-mentioned three types of information recording media 100 with the power modulation between Pp and Pb described above under the conditions of 16 ⁇ speed and 5 ⁇ speed. The jitter value j (%) was measured. These media were left for 100 hours in a thermostatic chamber at a temperature of 80 ° C and a relative humidity of 20%, and then removed.
- C indicates that it is difficult to use at the linear velocity
- B indicates that it can be used.
- B means favorable (good)
- A means more preferred, better (excellent)
- S rating means even more preferred U, better (excellent).
- the information recording medium of the comparative example in which the recording layer does not contain M is S at 16 ⁇ speed erasure rate and 16 ⁇ speed rewritability and 5 ⁇ speed recording storability. It became power evaluation. That is, since the recording layer of this medium has an excessively high crystallization rate, the recording storability at a low linear velocity cannot be ensured.
- the recording layer 104 is made of (GeTe)
- Example 2 an information recording medium having a DVD-RAM specification was produced and an experiment was conducted. Specifically, the information recording medium 100 shown in FIG. 1 was manufactured, and recording / reproduction evaluation and reliability evaluation were performed. In this example, six types of information recording media (medium numbers 100-4 to 9) having different compositions of the recording layer 104 were produced. Specifically, in these media, the recording layer 104 is represented by (GeTe) [(In Te) (Bi Te)] (mol%), and y force is 0.05, 0.1, 0, respectively.
- a medium 100 (medium number 100-B) having the recording layer 104 represented by the above formula (3) and having a material force where M is In and y is 1 was prepared. Furthermore, the medium corresponding to the medium number 100-A evaluated in Example 1 was also evaluated. Recording / reproduction evaluation and reliability evaluation were performed at 5x, 6x, 12x, and 16x speeds. The production method and evaluation method will be specifically described below.
- Example 2 the substrate 101 is the same as the substrate 101 used in Example 1, and the first dielectric layer 102, the first interface layer 103, the second interface layer 105, and the second dielectric layer are used.
- the body layer 106, the light absorption correction layer 107, and the reflective layer 108 were formed using the same materials as those layers in the medium of Example 1 so as to have the same film thickness.
- the sputtering conditions for all layers were the same as those used in Example 1.
- the bonding process and the initialization process were performed in the same manner as in Example 1.
- the recording layer 104 was formed on the surface of the first interface layer 103 so as to have a thickness of 7 nm.
- the recording layer 104 is substantially made of a material represented by (GeTe) [(In Te) (Bi Te)] (mol%).
- the produced medium had a mirror surface reflectance of Rc of about 16% and Ra of about 2%.
- Example 1 Using the same recording / reproducing apparatus as used in Example 1, Pp and Pb were adopted in Example 1 for group recording and land recording at 5 ⁇ speed, 6 ⁇ speed, 12 ⁇ speed, and 16 ⁇ speed, respectively. The procedure was set according to the same procedure. Based on the Pp and Pb, the erasure rate, recording storability, and rewrite storability at each linear velocity were evaluated.
- Table 2 shows the evaluation results of erasure rate, Aja, and ⁇ jo in 5, 6, 12 and 16-times group recording for 6 types of information recording media and 2 types of information recording media for comparison. .
- media Nos. 100-4 to 8 were usable in the range from 5 to 16 times speed.
- the erasure rate of 16 times speed was C evaluation.
- evaluations of B or higher were obtained, so it could be used from 5 times speed to 12 times speed.
- the jitter value between the front end and the jitter value between the rear ends are both 12% or less, which is sufficient for image file use and sufficiently practical for data file use.
- Example 3 the recording layer 104 is represented by (GeTe) [(Ga Te) (Bi Te)] (mol%).
- the information recording medium was manufactured and evaluated in the same manner as in Example 2 except that the material strength was changed to a layer substantially consisting of material.
- the material strength was changed to a layer substantially consisting of material.
- Example 4 the recording layer 104 is represented by (GeTe) [(Al Te) (Bi Te)] (mol%).
- the information recording medium was manufactured and evaluated in the same manner as in Example 2 except that the material strength was changed to a layer substantially consisting of material.
- Example 5 an experiment was performed by producing a Blu-ray Disc specification medium. Specifically, the information recording medium 200 shown in FIG. 2 was manufactured, and recording / reproduction evaluation and reliability evaluation were performed. In this example, eight types of information recording media (medium numbers 200-1 to 8) having different recording layer compositions were produced. Specifically, in these media, the recording layer 204 has (GeTe) [
- the recording layer 204 made of a material not having M (i.e., M Te) and Bi (i.e., Bi T
- a medium 200 (medium number 200—A and B) having a recording layer 204 without 2 3 2 e) was also prepared.
- a method for manufacturing the information recording medium 200 will be described.
- a polycarbonate substrate (diameter 120 mm, thickness 1.1 mm) with guide grooves (depth 20 nm, distance between groove groups 0.32 m) was prepared, as shown in Fig. 5. It was installed in the sputtering apparatus.
- a layer made of Ag-Pd-Cu was formed as the reflective layer 207 by sputtering to a thickness of 80 nm, and the second dielectric layer 206 (ZrO ) (SiO 2) (Ga 2 O 3) (mol%) layer is sputtered to a thickness of 20 nm
- the second interface layer 205 was not provided, and the recording layer 204 was laminated on the surface of the second dielectric layer 206 by sputtering so as to have a thickness of l nm.
- the ratio of In Te in the recording layer that is, the value of y in the above equation) differs for each medium.
- the first dielectric layer 202 is made of (ZnS) (SiO 2) (mol%) Was formed to a thickness of 60 nm.
- Media No. 200—A and B media have recording layers 204 (GeTe) (Bi Te) (mol%) and (GeTe) (In Te) (
- the sputtering conditions for forming each layer will be described.
- the sputtering conditions for the reflective layer 207 were the same as the sputtering conditions for the reflective layer 108 of Example 1.
- the second dielectric layer 206 is made of (ZrO 2) (SiO 2) (Ga 2 O 3) (mol%) having a diameter of 100 mm and a thickness of 6 mm.
- a sputtering target was used, and sputtering was performed at an output of 500 W using a high-frequency power source in an Ar gas atmosphere at a pressure of 0.13 Pa.
- the recording layer 204 was formed by using a sputtering target containing Ge, Te, Bi, and In having a diameter of 100 mm and a thickness of 6 mm in an Ar gas atmosphere at a pressure of 0.13 Pa using a DC power source. A film was formed by sputtering at the output.
- the sputtering conditions for the first interface layer 203 were the same as those for the first and second interface layers 103 and 105 of Example 1.
- the sputtering conditions for the first dielectric layer 202 were the same as those for the first dielectric layer 102 and the second dielectric layer 106 of Example 1.
- the substrate 208 in which the reflective layer 207, the second dielectric layer 206, the recording layer 204, the first interface layer 203, and the first dielectric layer 202 are sequentially formed on the substrate 208 as described above. was removed from the sputtering equipment. Then, an acrylic resin, which is an ultraviolet curable resin, was applied to the surface of the first dielectric layer 202 by a spin coating method. A 90 m thick disc-shaped acrylic resin sheet was adhered to the surface of the applied resin, and the resin was cured by irradiating ultraviolet rays to the sheet side force to form the cover layer 201. . The thickness of the cover layer 201 was 100 ⁇ m as a whole, with the thickness of the UV curable resin applied by spin coating being 10 m.
- an initialization step was performed.
- the recording layer 204 of the information recording medium 200 was crystallized over almost the entire surface in an annular region having a radius of 22 to 60 mm using a semiconductor laser having a wavelength of 810 nm.
- the initialization process was completed, and the production of the information recording media 200 of media numbers 200-1 to 8 was completed.
- the specular reflectance was about 18% Rc and about 3% Ra.
- a recording / reproduction evaluation method In order to record information on the information recording medium 200, a spindle motor that rotates the information recording medium 200, an optical head including a semiconductor laser that emits laser light 209, and the laser light 209 on the recording layer 204 of the information recording medium 200
- the recording / reproducing apparatus having the configuration shown in FIG.
- a semiconductor laser having a wavelength of 405 nm and an objective lens having a numerical aperture of 0.85 were used, and recording corresponding to a capacity of 25 GB was performed.
- the information recording medium 200 rotates at a linear speed of 1x speed (4.92mZ seconds, data transfer rate: 36Mbps), 2x speed (9.84mZ seconds, 72Mbps), and 4x speed (19.68mZ seconds, 144Mbps).
- the numbers were changed and recorded.
- the reproduction evaluation of the recorded signal was performed by irradiating a 0.35 mW laser beam at 1 ⁇ speed.
- the playback evaluation condition may be that the playback power may be greater than 0.35 mW, which may be performed at a linear velocity greater than 1 ⁇ speed.
- a time interval analyzer was used to measure the jitter value when calculating the average jitter value (the average value of the jitter between the front end and the back end jitter).
- the jitter value in this embodiment indicates a limit “equalized” jitter value (LEQ jitter value).
- the peak power (Pp) and the bias power (Pb) were set according to the following procedure.
- the laser beam 209 is irradiated to the information recording medium 200 while being modulated between a high power level peak power (mW) and a low power level bias power (mW), and 2T (mark length 0.149).
- 111) to 8 mark length 0.596 m were recorded 10 times on the same group surface of the recording layer 204. After recording, the average jitter value was measured.
- the reliability evaluation is performed to check whether the recorded signal is preserved even under high temperature conditions and whether it can be rewritten after being subjected to high temperature conditions.
- the evaluation was performed using the same recording / reproducing apparatus as described above.
- the specific evaluation method is as follows. First, a random signal is applied to the above-described eight types of information recording media 200 while performing power modulation between Pp and Pb set as described above. Multiple tracks were recorded in the group under the conditions of 1 ⁇ , 2 ⁇ , and 4 ⁇ speeds, and the jitter value j (%) was measured. These media were left for 100 hours in a thermostatic bath at a temperature of 80 ° C and a relative humidity of 20%, and then removed.
- the recorded signal was reproduced and the jitter value ja (%) was measured (evaluation of recording storability).
- the jitter value jo (%) was measured by overwriting the recorded signal with Pp and Pb, and overwriting once (evaluation of rewrite preservation).
- Table 3 shows the evaluation results of the erasure rate, Aja, and ⁇ jo at 1, 2, and 4 times speed for the eight types of information recording media and the information recording media of the comparative example.
- S, C, and A have the following meanings: It is as follows.
- C indicates that it is difficult to use at the linear velocity
- B indicates that it can be used.
- B means favorable (good)
- A means more preferred, better (excellent)
- S rating means even more preferred U, better (excellent).
- the media with media number 200— :! to 8 have been evaluated at B and higher at all linear velocities, so they can be used at 1x speed and 4x speed.
- medium No. 200-B Aja, which has 1x speed and 4x speed, was rated C.
- the recording layer of this medium is used at 4x or less of Blu-ray Disc specifications where the crystallization speed is very high. I found out that I can't use it.
- the medium No. 200-A was evaluated for the erasure rate power from 1 to 4 times speed. That is, it was found that the recording layer of this medium cannot be used at a speed of 1 ⁇ or higher of the Blu-ray Disc specification with a low crystallization speed.
- Example 6 the recording layer 204 is represented by (GeTe) [(Ga Te) (Bi Te)] (mol%).
- the information recording medium was evaluated in the same manner as in Example 5 except that an information recording medium (medium number 200-11 to 18) was manufactured as a layer substantially composed of the above material.
- an information recording medium medium number 200-11 to 18
- Example 7 the recording layer 204 is represented by (GeTe) [(Al Te) (Bi Te)] (mol%).
- the information recording medium was evaluated in the same manner as in Example 5 except that the information recording medium (medium number 200-21 to 28) was manufactured as a layer that also had substantially the same material strength.
- the information recording medium medium number 200-21 to 28
- Example 8 is a Blu-ray Disc specification and has two information layers as shown in FIG. New information recording medium 300 was manufactured, and recording / reproduction evaluation and reliability evaluation were performed.
- the first recording layer 304 is made of a material represented by (GeTe) [(In Te) (Bi Te)] (mol%) x 2 3 y 2 3 1-100- ⁇ , or [( SnTe) (GeTe)] [(In Te) (Bi Te)] (mol% z 1 -zx 2 3 y 2 3 1 -y 100- ⁇
- the second recording layer 311 is made of (GeTe) [(In Te) x 2 3
- a layer substantially consisting of a material represented by (BiTe)] (mol%) was formed. Also compare y 2 3 1 -y 100- ⁇
- the first recording layer 304 is made of a material represented by (GeTe) (In Te) (mol%).
- a material layer that does not contain M i.e.
- a layered medium (media number 300—A) was prepared.
- the recording / reproduction evaluation and reliability evaluation were performed at 1 ⁇ speed, 2 ⁇ speed, and 4 ⁇ speed, as in Example 5.
- the production method and evaluation method will be specifically described below.
- a substrate 315 having the same shape and having the same material force as that of the substrate 208 of Example 5 was prepared and mounted in a sputtering apparatus as shown in FIG.
- the guide grooves are formed surface of the substrate 315, the second reflective layer 314 as eight 8 -? (Formed by sputtering a 1-01 or we made a layer in a thickness of 80 nm, the fifth As the dielectric layer 313, a layer made of (ZrO 2) (SiO 2) (Ga 2 O 3) (mol%) is formed so as to have a thickness of 17 nm.
- the second recording layer 311 was formed by sputtering so as to have a thickness of 1 Inm without forming the third interface layer 312.
- the second recording layer 311 is made of a material represented by (GeTe) [(In Te) (Bi Te)] (mol%)
- the second recording layer 311 is a layer that also substantially includes the material force represented by (GeTe) (Bi Te) (mol%).
- mol%) layer is formed by sputtering so as to have a thickness of 5 nm.
- a layer made of (ZnS) (SiO 2) (mol%) is scanned so as to have a thickness of 60 nm.
- the second information layer 316 was formed.
- an intermediate layer 308 having guide grooves was formed on the surface of the dielectric layer 309 to a thickness of 25 m.
- the third dielectric layer 307 is made of TiO
- a layer made of Ag—Pd—Cu is formed with a thickness of lOnm, and a layer made of (ZrO) (SiO 2) (Ga 2 O 3) (mol%) is formed as the second dielectric layer 305 with a thickness of lOnm.
- the first recording layer 304 was deposited by sputtering so as to have a thickness of 6 nm.
- the first recording layer 304 is (GeTe) [(In Te) (Bi
- the first recording layer 304 is (GeTe) (In Te) (mol%)
- a layer composed of nS) (SiO 2) (mol%) was formed to a thickness of 40 nm.
- a first information layer 317 was formed.
- the sputtering conditions and formation conditions of each layer will be described.
- the sputtering conditions for the second reflective layer 314 were the same as those for the reflective layer 108 of Example 1.
- the sputtering conditions for the fifth dielectric layer 313 were the same as those for the second dielectric layer 206 of Example 5.
- the second recording layer 311 is made of a sputtering target containing Ge, Te, Bi, and In having a diameter of 100 mm and a thickness of 6 mm, and is 100 W using a DC power source in an Ar gas atmosphere at a pressure of 0.13 Pa.
- the film was formed by sputtering with the output of
- the sputtering conditions for the second interface layer 310 were the same as those for the first and second interface layers 103 and 105 in Example 1.
- the sputtering conditions for the second dielectric layer 309 were the same as those for the first dielectric layer 102 and the second dielectric layer 106 of Example 1.
- the intermediate layer 308 was formed by the following procedure. First, an acrylic resin, which is an ultraviolet curable resin, was applied to the surface of the dielectric layer 309 by spin coating. Next, shape the middle layer Concavities and convexities that are complementary to the guide groove to be formed (depth 20 nm, distance between groove groups 0.
- the uneven surface of the polycarbonate substrate having a thickness of 32 ⁇ m was adhered to an ultraviolet curable resin.
- ultraviolet rays were irradiated to cure the resin, and then the polycarbonate substrate having unevenness was peeled off.
- an intermediate layer 308 made of hardened resin having guide grooves of the same shape as the substrate 315 formed on the surface was formed.
- a first information layer 317 was formed on the surface of 8.
- the third dielectric layer 307 was formed on the intermediate layer 308.
- the third dielectric layer 307 is composed of a TiO sputtering target with a diameter of 100 mm and a thickness of 6 mm using Ar gas and 3% oxygen gas.
- the first recording layer 304 is formed by sputtering a sputtering target containing Ge, Te, In, and Bi, having a diameter of 100 mm and a thickness of 6 mm, in an Ar gas atmosphere at a pressure of 0.13 Pa with a DC power supply and an output of 50 W. Formed.
- the first recording layer 304 is formed using a DC power source in an Ar gas atmosphere having a pressure of 0.13 Pa using a sputtering target containing Ge, Sn, Te, In, and Bi having a diameter of 100 mm and a thickness of 6 mm. Sputtered at 50W output.
- the power for forming the first recording layer 304 was low in order to ensure film thickness accuracy because the film thickness was thin.
- the sputtering conditions for the first interface layer 303 were the same as those for the first and second interface layers 103 and 105 of Example 1.
- the sputtering conditions for the first dielectric layer 302 were the same as those for the first dielectric layer 102 and the second dielectric layer 106 of Example 1.
- the substrate 315 on which the first information layer was formed on the intermediate layer 308 as described above was also taken out the sputtering apparatus force.
- an ultraviolet curable resin was applied to the surface of the first dielectric layer 302 by spin coating.
- a disc-shaped sheet was brought into close contact with the surface of the applied ultraviolet curable resin, and the resin was cured by irradiating ultraviolet rays with the sheet side force to form the cover layer 301.
- the thickness of the UV curable resin is 10 ⁇ m and the thickness of the sheet is 65 ⁇ m. Had a thickness of 75 ⁇ m.
- an initialization step was performed.
- the second recording layer 311 was initialized using a semiconductor laser having a wavelength of 810 nm, and then the first recording layer 304 was initialized. All were crystallized over almost the entire surface in an annular region with a radius of 22-60 mm.
- the initialization process was completed, and the production of the information recording medium 300 of medium numbers 300-1 to 3 and A was completed.
- the specular reflectances of both the first information layer 317 and the second information layer 316 were Rc of about 6% and Ra of about 1%.
- the reflectance of the second information layer 316 is measured with laser light that has passed through the first information layer 317.
- the light transmittance of the first information layer 317 was Tc of about 51% and Ta of about 52%.
- the measurement of the light transmittance of each information layer was performed by producing each information layer on the substrate 315.
- the recording / reproducing apparatus having the configuration shown in FIG.
- a laser beam 318 having a wavelength of 405 nm and an objective lens having a numerical aperture of 0.85 were used, and recording corresponding to 25 GB capacity was recorded on each of the first information layer 317 and the second information layer 316. went.
- the information recording medium 300 was recorded at linear speeds of 1 ⁇ , 2 ⁇ , and 4 ⁇ speeds as in Example 5.
- the reproduction evaluation of the recorded signal was performed by irradiating a 0.7 mW laser beam at the equivalent of 1 ⁇ speed. Note that the playback evaluation condition may be that the playback power may be higher than 0.7 mW, even if it is performed at a linear speed higher than 1 ⁇ speed.
- a time interval analyzer was used to measure the LEQ jitter value.
- the peak power (Pp) and the bias power (Pb) were set according to the same procedure as in Example 5.
- the Pp of the first information layer 317 and the second information layer 316 are both about 10 mW at 1x (36 Mbps) and about l lmW at 2x (72 Mbps)
- quadruple speed (144 Mbps) it is about 14 mW, which is a value that can achieve a sufficient system balance.
- the LEQ jitter value obtained for the medium of medium number 300-1 is 7% for the first information layer 317, 5.7% for the second information layer 316, and 2% at 1x speed (36 Mbps).
- the first information layer is 7.5%
- the second information layer is 6%
- at quadruple speed (144 Mbps) the first information layer The information layer was 8% and the second information layer was 6.5%.
- Table 3 shows the evaluation results of the erasure rate, Aja, and Ajo at 1, 2, and 4 times speed for the three types of information recording media and the comparative information recording media.
- the meanings of S, C, and A are as described in Example 5.
- the condition “—” indicates that Pp and Pb, which have a low erasure rate, could not be determined, and that record storability and rewritability could not be evaluated.
- the first composition of the recording layer (mol%) 1 ⁇ speed 2x 4x 1x 2x 4x 1x 2x 4x the 1 (GeTe) 97 [(In 2 Te 3) 0. 3 (Bi 2 Te 3 ) 0. 7 ] 3 S s AAAS s AA
- the erasure rate at the 1st to 4th speed of the first information layer is C evaluation, and the 1st to 4th speed of the second information layer
- the ⁇ in was a C rating. This is because the crystals of (GeTe) (In Te) (mol%) constituting the first recording layer
- the jitter values between the trailing edges were both 9% or less, which was sufficient for image file applications and practical enough for data file applications.
- the maximum line is obtained by configuring the recording layer with the material represented by the above formula (3) or the above formula (4) in the recording layer. It was confirmed that it can be used in a linear velocity range where the velocity is 2.4 times or more of the minimum linear velocity. In other words, according to the present invention, an excellent information recording medium capable of CAV recording can be obtained even with the double-layer Blu-ray Disc specification.
- Example 9 three types of media (medium numbers 300-4, 5, 6) were manufactured using a material containing Ga instead of In as M, and recording was performed in the same manner as in Example 8. Reproduction evaluation and reliability evaluation were conducted.
- both the first recording layer 304 and the second recording layer 311 are made of materials represented by (GeTe) [(Ga Te) (Bi Te)] (mol%).
- the first recording layer 304 is substantially made of a material represented by [(SnTe) (GeTe)] [(Ga Te) (Bi Te)] (mol%).
- the second recording layer 311 is formed of (GeTe) [(Ga Te) (Bi Te)] (mol%)
- the first recording layer 304 is indicated by [(SnTe) (GeTe)] [(Ga Te) (Bi Te)] (mol%).
- the second recording layer 311 is made of (GeTe) [(Ga Te) (Bi
- the layer substantially consists of Te)] (mol%).
- the medium is a double-layer Blu-ray Disc specification, and the maximum linear velocity is 2.4 times or more the minimum linear velocity. It was remarkable that an excellent information recording medium capable of CAV recording that can be used in the speed range was obtained.
- Example 10 three types of media (medium numbers 300-7, 8, 9) were manufactured using a material containing A1 instead of In as M, and recording was performed in the same manner as in Example 8. Reproduction evaluation and reliability evaluation were conducted.
- both the first recording layer 304 and the second recording layer 311 are made of a material represented by (GeTe) [(Al Te) (Bi Te)] (mol%).
- the first recording layer 304 is a layer substantially composed of [(SnTe) (GeTe)] [(Al Te) (Bi Te)] (mol%).
- the recording layer 311 of 2 consists essentially of (GeTe) [(Al Te) (Bi Te)] (mol%)
- the first recording layer 304 is [[SnTe) (GeTe)
- Example 11 a Blu-ray Disc specification medium was manufactured and tested in the same manner as in Example 5. Specifically, the information recording medium 200 shown in FIG. 2 was manufactured, and recording reproduction evaluation and reliability evaluation were performed.
- the recording layer 204 is represented by (GeTe) [(In Te) (Bi Te)] (mol%) x 2 3 0. 3 2 3 0. 7 100- ⁇ , consisting essentially of materials where x is 85, 88, 91, 94 and 98 respectively Met.
- the recording layer 204 is made of a material force not containing M (ie, M Te).
- medium 200 having a recording layer 204 without Bi (ie, Bi Te)
- a substrate 208 similar to that used in Example 5 was prepared and mounted in a sputtering apparatus as shown in FIG.
- a layer made of Ag—Ga—Cu was formed as a reflective layer 207 by sputtering so as to have a thickness of 80 ⁇ m.
- a layer made of (ZrO 2) (SiO 2) (In 2 O 3) (mol%) is sputtered to a thickness of 20 nm.
- the second interface layer 205 was not provided, and the recording layer 204 was laminated on the surface of the second dielectric layer 206 by sputtering so as to have a thickness of l nm.
- the recording layer 204 was formed by adjusting the composition of the sputtering target so that the ratio of GeTe in the recording layer (that is, the value of x in the above formula) was different for each medium.
- the first interface layer 203 and the first dielectric layer 202 were formed to the same thickness as those layers in the medium manufactured in Example 5, using the same materials as those used in Example 5. .
- the media with the media numbers 200—C and 200—D have the recording layer 204 (GeTe) (Bi Te) (mo
- the sputtering target of the reflective layer 207 is a sputtering target made of Ag—Ga—Cu with a diameter of 100 mm and a thickness of 6 mm. In an Ar gas atmosphere at a pressure of 0.4 Pa, the output is 200 W using a DC power supply. It was formed by sputtering.
- the second dielectric layer 206 has a diameter of 100 mm and a thickness of 6 mm (ZrO 2).
- Sputtering was performed in a Ar gas atmosphere using a high-frequency power source with an output of 500 W.
- the recording layer 204 is sputtered using a sputtering target containing Ge, Te, Bi, and In, having a diameter of 100 mm and a thickness of 6 mm, in an Ar gas atmosphere at a pressure of 0.13 Pa, and at a power of 100 W using a DC power supply.
- a film was formed.
- the sputtering conditions for the first interface layer 203 and the first dielectric layer 202 were the same as those in Example 5.
- the substrate 208 in which the reflective layer 207, the second dielectric layer 206, the recording layer 204, the first interface layer 203, and the first dielectric layer 202 are sequentially formed on the substrate 208 as described above. was removed from the sputtering equipment. Then, an acrylic resin, which is an ultraviolet curable resin, is applied to the surface of the first dielectric layer 202 by a spin coating method, and the resin is cured by irradiating ultraviolet light from the resin side. 201 was formed to a thickness of 97 m.
- an acrylic resin which is an ultraviolet curable resin
- the resin is cured by irradiating ultraviolet rays from the resin side to form a hard coat layer. It was formed to a thickness of m.
- the hard coat layer has the function of protecting the media from scratches and fingerprints.
- the cover layer 201 and the hard coat layer were formed to a total thickness of 100 / zm. In this way, the cover layer forming step was completed.
- the recording / reproduction evaluation method, erasure rate measurement method, and reliability evaluation method are the same as those in Example 5.
- the obtained Pp is 5.lmW, 1x speed (36Mbps), 5 lmW, 2x speed (72Mbps) [koo! /, Teorama 5.5mW, 4x speed (144Mbps) [koo] ! /, ⁇ 7 7.5 mW, which is a value that can sufficiently balance the system.
- the obtained LEQ jitter value is 1 x speed (36 Mbps) [KOO! Satoshi ⁇ MA 5. 6%, 2 times speed (72 Mbps) [KOO! Satoshi ⁇ MA 5. 8%, 4 times speed ( (144Mbps) is 6.5%, which is a value that can sufficiently balance the system.
- Table 5 shows the evaluation results of the erasure rate, Aja, and ⁇ jo at 1, 2, and 4 times speed for five types of information recording media and two types of information recording media for comparison.
- the meanings of S, C, and A are as described in connection with Example 5.
- media numbers 200-31 35 have been evaluated as B or higher at all linear velocities, so 1x speed can be used at 4x speed.
- (GeTe) [(In Te) (Bi Te)] (mx 2 3 y 2 3 1-100-x ol%), and the medium in which the recording layer 204 is made of a material that satisfies the range of 85 ⁇ x ⁇ 98 is confirmed to be usable in the linear velocity range where the maximum linear velocity is 2.4 or more times the minimum linear velocity. It was done.
- both the jitter value between the front end and the jitter value between the rear end were 9% or less, which was sufficient for image file use and sufficiently practical for data file use.
- Example 12 As Ge, Ga is contained instead of In, (GeTe) [(Ga Te) (x 2 3 0. 3
- M includes A1 instead of In, (GeTe) [(Al Te) (Bi x 2 3 0.3
- Type media (medium numbers 200-51 to 55) were produced and evaluated in the same manner as in Example 11.
- Example 14 a Blu-ray Disc specification medium was produced and experimented basically in the same manner as in Example 8. Specifically, three types of information recording media 300 having two information layers as shown in Fig. 3 (medium numbers 300-11 to 13) were manufactured, and recording / reproduction evaluation and reliability evaluation were performed.
- the first recording layer 304 is made of (GeTe) [(In Te) (Bi Te) x 2 3 y 2 3 1
- the first recording layer 304 is made of a material represented by (GeTe) (Bi Te) (mol%).
- the second recording layer 311 is a material represented by the formula (GeTe) (In Te) (mol%).
- a medium 300 (medium number 300-B) was prepared as a layer composed of the material. Recording / reproduction evaluation and reliability evaluation were performed at 1 ⁇ speed, 2 ⁇ speed, and 4 ⁇ speed, as in Example 8. The manufacturing method and evaluation method are described below.
- a substrate 315 similar to that used in Example 8 was prepared and mounted in a sputtering apparatus as shown in FIG.
- a layer made of Ag—Ga—Cu was formed as a reflective layer 314 by sputtering so as to have a thickness of 80 ⁇ m.
- a layer made of (ZrO) (SiO 2) (In 2 O 3) (mol%) was sputtered to a thickness of 17 nm.
- the third interface layer 312 was not provided, and the second recording layer 311 was laminated on the fifth dielectric layer 313 so as to have a thickness of l nm.
- the second recording layer 311 is made of a material represented by (GeTe) [(In Te) (Bi Te)] (mol%).
- the second recording layer 311 was a layer having a material force represented by the formula (GeTe) (In Te) (mol%).
- Second interface layer
- the second information layer 316 was formed.
- an intermediate layer 308 having guide grooves was formed on the surface of the fourth dielectric layer 309 to a thickness of 25 m.
- a layer having Ag—Ga—Cu force is also formed as a first reflective layer 306 by sputtering so as to have a thickness of 10 nm.
- a dielectric layer 305 a layer made of (ZrO 2) (SiO 2) (In 2 O 3) (mol%) is lOnm
- the first recording layer 304 was formed so as to have a thickness of 6 nm.
- the first recording layer 304 is (GeTe) [(In Te) (Bi
- the material was substantially composed of a material represented by Te) (Bi Te)] (mol%).
- the first recording layer 304 is (GeTe) (Bi Te) (
- the first interface layer 303 was formed on the first recording layer 304 as (ZrO 2).
- a layer made of (SiO 2) (Cr 2 O 3) (mol%) is formed to a thickness of 5 nm, and the first dielectric layer is formed.
- a layer made of (ZnS) (SiO 2) (mol%) is formed as the electric layer 302 so as to have a thickness of 40 nm.
- the first information layer 317 was formed.
- the sputtering conditions and formation conditions of each layer will be described.
- the sputtering conditions for the reflective layer 314 were the same as those for the reflective layer 207 of Example 11.
- the sputtering conditions for the fifth dielectric layer 313 were the same as those for the second dielectric layer 206 of Example 11.
- the sputtering conditions for the second recording layer 311 were the same as the sputtering conditions for the second recording layer 311 in Example 8.
- the sputtering conditions for the second interface layer 310 were the same as those for the first and second interface layers 103 and 105 of Example 1.
- the sputtering conditions for the second dielectric layer 309 were the same as those for the first dielectric layer 102 and the second dielectric layer 106 of Example 1.
- the intermediate layer 308 was formed by the same procedure as that employed in Example 8.
- the substrate 315 formed up to the intermediate layer 308 was again placed in the sputtering apparatus, and the first information layer 317 was formed on the surface of the intermediate layer 308.
- the third dielectric layer 307 is formed on the intermediate layer 308.
- the sparking conditions for the third dielectric layer 307 were the same as those for the third dielectric layer 307 in Example 8.
- a second reflective layer 306 was formed under the same conditions as the sputtering conditions for the reflective layer 207 in Example 11.
- the sputtering conditions for the second dielectric layer 305 were the same as those for the fifth dielectric layer 313 in this example.
- the first recording layer 304 was formed under the same conditions as the sputtering conditions for the first recording layer 304 in Example 8.
- First interface layer 3 03 was formed under the same conditions as the sputtering conditions for the first and second interface layers 103 and 105 in Example 1.
- the first dielectric layer 302 was formed under the same conditions as the sputtering conditions for the first dielectric layer 102 and the second dielectric layer 106 in Example 1.
- the substrate 315 having the first information layer formed on the intermediate layer 308 as described above is taken out from the sputtering apparatus. Then, an acrylic resin, which is an ultraviolet curable resin, is applied to the surface of the first dielectric layer 302 by a spin coating method, and the resin is cured by irradiating ultraviolet rays with a side force of the resin, so that a cover layer is formed. 301 was formed to a thickness of 72 m. Further, an acrylic resin, which is an ultraviolet curable resin, is applied to the surface of the cover layer 301 by a spin coat method, and the resin is cured by irradiating ultraviolet rays from the resin side, and the hard coat layer is coated with 3 m. It was formed so that In this example, the total thickness of the cover layer 301 and the hard coat layer was 75 m. In this way, the cover layer forming step was completed.
- an acrylic resin which is an ultraviolet curable resin
- an initialization step was performed under the same conditions as in Example 8. As a result, the initialization process was completed, and the production of the information recording medium 300 of medium numbers 300-11 to 13 and 300-B was completed.
- the mirror surface reflectance power Rc of both the first information layer 317 and the second information layer 316 was about 6% and Ra was about 1%.
- the reflectance of the second information layer 316 is measured with laser light that has passed through the first information layer 317.
- the light transmittance of the first information layer 317 was about 51% Tc and about 52% Ta.
- the measurement of the light transmittance of each information layer was performed by producing each information layer on the substrate 315.
- the recording / reproduction evaluation method, erasure rate measurement method, and reliability evaluation were performed under the same conditions as in Example 8.
- the Pp of the first information layer 317 and the second information layer 316 are both about 10mW at 1x (36Mbps), about llmW at 4x (72Mbps), 4x ( At 144 Mbps), it was about 14 mW, which was a value that could achieve a sufficient system balance.
- the obtained LEQ jitter value is 7.1% for the first information layer 317, 5.8% for the second information layer 316 at 1x speed (36Mbps), and 5.8% for the 2nd speed (72Mbps).
- the first information layer is 7.4%
- the second information layer is 5.9%
- at 4x speed (144Mbps) the first information layer is 8.0%
- the second information layer is 6. It was 5%, which was a value that could provide sufficient system balance.
- Table 6 shows the evaluation results of the erasure rate, Aja, and ⁇ jo at 1, 2, and 4 times speed for the three types of information recording media and the comparative information recording media.
- the meanings of S, C, and A are as described in connection with Example 5.
- the condition “—” indicates that Pp and Pb, which have a low erasure rate, cannot be determined, and the record storability and rewrite storability cannot be evaluated.
- the first composition of the recording layer (mol.b) 1 ⁇ speed 2x 4x 1x 2x 4x 1x 2x 4x the 1 (GeTe) 93 [(ln 2 Te 3) 0. 5 (Bi 2 Te 3 ) 0. 5 ] 7 S s AAAS s AA
- the recording layer is composed of the material represented by the above formula (4), so that it can be used at least at 1 ⁇ speed and at 4 ⁇ speed.
- Example 15 three types of media (medium numbers 300-14, 15, 16) were manufactured using a material containing Ga instead of In as M, and recording was performed in the same manner as in Example 14. Reproduction evaluation and reliability evaluation were conducted.
- the medium number 300-14 the first recording layer 304 and the second recording layer 311 are both represented by (GeTe) [(Ga Te) (Bi Te)] (mol%).
- the first recording layer 30 4 is made of a material represented by [(SnTe) (GeTe)] [(Ga Te) (Bi Te)] (mol%).
- the second recording layer 311 is made of (GeTe) [(Ga Te) (Bi Te)]
- the first recording layer 304 is [[SnTe) (GeTe)] [(Ga Te) (Bi Te)] (mol
- the second recording layer 311 is made of (GeTe) [(Ga T
- the medium is a double-layer Blu-ray Disc specification medium as in Example 14, and the maximum linear velocity is 2.4 times or more the minimum linear velocity. It was remarkable that an excellent information recording medium capable of CAV recording that can be used beyond the range was obtained.
- Example 16 three types of media (medium numbers 300-17, 18, 19) were manufactured using a material containing A1 instead of In as M, and recording / reproduction was performed in the same manner as in Example 14. Evaluation and reliability evaluation were conducted.
- the medium number 300-17 the first recording layer 304 and the second recording layer 311 are both represented by (GeTe) [(Al Te) (Bi Te)] (mol%).
- the first recording layer 304 is made of a material represented by [(SnTe) (GeTe)] [(Al Te) (Bi Te)] (mol%).
- the second recording layer 311 is made of (GeTe) [(Al Te) (Bi Te)] (m
- the first recording layer 304 is made of [(SnTe) (GeTe)] [(Al Te) (Bi Te)] (mol%).
- the second recording layer 311 is made of (GeTe) [(Al Te) (
- the medium was a dual-layer Blu-ray Disc specification medium, and the maximum linear velocity was 2.4 times or more the minimum linear velocity. It was remarkable that an excellent information recording medium capable of CAV recording that can be used in the speed range or higher can be obtained.
- composition of the recording film which was determined to have sufficient material strength, was analyzed by the X-ray microanalysis method.
- the analysis method by ICP emission spectroscopy is as described in Example 1 above.
- Composition analysis by the X-ray microanalysis method was performed using JXA8900R manufactured by JEOL Ltd.
- the composition of the film formed under the same conditions was analyzed by X-ray microanalysis.
- the result Result the membrane, with respect to four elements, having a composition of Ge Bi Te In (atomic 0/0)
- ICP emission spectroscopy and X-ray microanalysis were used as quantitative analysis methods for elements.
- Other analysis methods include Auger electron spectroscopy (Auger electr on spectroscopy) and secondary ion mass spectrometry (Secondary ion mass spectroscopy), and the same quantitative analysis is possible by either method.
- Example 18 the same measurement as in Example 17 was performed by ICP emission spectroscopy.
- Example 19 the information recording medium 100-2 (2) substantially the same as the information recording medium 100-2 prototyped in Example 1 was prototyped, and the composition analysis of the recording layer 104 was performed.
- the recording layer 104 is replaced with (Ge Te) [(Ga Te) (Bi Te)] (mol%) (Ge Bi Te Ga (atom 0 /.)).
- the composition analysis of the recording layer can also be carried out by a method of analyzing the recording layer using a transmission electron microscope after the information recording medium is prepared.
- a method for analyzing the composition of the recording layer in the information recording medium for example, a cutter blade is put on the end face of the information recording medium, the substrate 101 and the dummy substrate 110 are peeled off, and the recording layer 104 or other layer is attached.
- Figure 4 shows an information recording medium for recording information by electrical means and a system for recording it.
- Example 20 an experiment was performed in which recording was performed by applying electrical energy to the recording layer of the information recording medium 400 shown in FIG. 4 using the recording layer of the present invention.
- the information recording medium 400 is a so-called memory.
- the information recording medium 400 of this example was manufactured as follows. First, a Si substrate 401 having a length of 5 mm, a width of 5 mm, and a thickness of 1 mm was prepared by nitriding the surface. On this substrate 401, an Au lower electrode 402 was formed in a region of lmm X lmm with a thickness of 0.1 m. From the material represented by (GeTe) [(In Te) (Bi Te)] (mol%) on the lower electrode 402
- a substantially recording layer 403 is formed in a region of lmm X lmm to a thickness of 0.1 ⁇ m, and an upper electrode 404 of Au is formed in a region of 0.6 mm X O. 6 mm in a thickness of 0.1 m. Formed with.
- the lower electrode 402, the recording layer 403, and the upper electrode 404 were formed by sputtering. These sputterings were sequentially performed with the substrate 401 attached to the film forming apparatus. First, the lower surface electrode 402 of the substrate 401 is formed by direct current sputtering in an Ar gas atmosphere at a pressure of 0.13 Pa using an Au sputtering target (diameter: 100 mm, thickness: 6 mm) at a power of 200 W. did.
- the recording layer 403 is formed on the lower electrode 402 using a sputtering target (diameter: 100 mm, thickness: 6 mm) containing Ge, In, Bi, and Te, the power is set to 100 W, and the pressure is 0.13 Pa in an Ar gas atmosphere.
- a sputtering target (diameter: 100 mm, thickness: 6 mm) containing Ge, In, Bi, and Te, the power is set to 100 W, and the pressure is 0.13 Pa in an Ar gas atmosphere.
- the upper electrode 404 was formed on the recording layer 403 by direct current sputtering using an Au sputtering target (diameter 100 mm, thickness 6 mm) at a power of 200 W in an Ar gas atmosphere at a pressure of 0.13 Pa. .
- the resistance measuring device 406 is connected to a determination unit 410 that determines whether the resistance value measured by the resistance measuring device 406 is high or low.
- the pulse generator 405 causes a current pulse to flow between the upper electrode 404 and the lower electrode 402 via the applying unit 409, and the resistance value between the lower electrode 402 and the upper electrode 404 is measured by the resistance measuring device 406.
- the determination unit 410 determines whether the value is high or low. The resistance value changes due to the phase change of the recording layer 403.
- the recording layer 403 had a melting point of 600 ° C., a crystallization temperature of 180 ° C., and a crystallization time of 50 ns.
- the resistance value between the lower electrode 402 and the upper electrode 404 was 1000 ⁇ when the recording layer 403 was in an amorphous state and 20 ⁇ when it was in a crystalline state.
- a current pulse of 20 mA, 60 ns is applied between the lower electrode 402 and the upper electrode 404.
- the resistance value decreased, and the recording layer 403 changed its amorphous state force to the crystalline state.
- a current pulse of 200 mA, 20 ns is applied between the lower electrode 402 and the upper electrode 404, so that the current between the lower electrode 402 and the upper electrode 404 is reduced.
- the resistance value increased, the crystalline state force of the recording layer 403 changed to the amorphous state. That is, a reversible phase change was confirmed. Sarako, high-speed memory of 100ns or less was possible, and high-speed memory was obtained.
- the information recording medium 400 including this film as the recording layer 403 has a function of recording and erasing information at high speed by applying electric energy.
- the recording layer 403 is represented by (GeTe) [(In Te) (Bi Te)] (mol%).
- the information recording medium of the present invention has been described through various embodiments.
- the present invention can be applied to both an information recording medium recorded by optical means and an information recording medium recorded by electric means. Can be applied. That is, the recording layer is made of a GeTe-BiTe material.
- the information recording medium of the present invention has a recording layer exhibiting excellent performance, and as a large-capacity optical information recording medium, a DVD—RAM disc, a DVD—RW disc, a DVD + RW disc, and a rewritable disc. Useful for type Blu-ray Discs. Furthermore, it is also useful as an electrical high-speed switching element as an electrical information recording medium.
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Abstract
Description
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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EP05740968A EP1669207B1 (en) | 2004-07-28 | 2005-05-19 | Information recording medium |
CN2005800015294A CN1906043B (zh) | 2004-07-28 | 2005-05-19 | 信息记录介质 |
DE602005019673T DE602005019673D1 (de) | 2004-07-28 | 2005-05-19 | Informationsaufzeichnungsmedium |
US10/573,174 US7709073B2 (en) | 2004-07-28 | 2005-05-19 | Information recording medium |
KR1020067009544A KR101047770B1 (ko) | 2004-07-28 | 2005-05-19 | 정보 기록 매체 |
AT05740968T ATE459485T1 (de) | 2004-07-28 | 2005-05-19 | Informationsaufzeichnungsmedium |
JP2006528400A JP4339356B2 (ja) | 2004-07-28 | 2005-05-19 | 情報記録媒体 |
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JP2004219731 | 2004-07-28 | ||
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US (1) | US7709073B2 (ja) |
EP (1) | EP1669207B1 (ja) |
JP (1) | JP4339356B2 (ja) |
KR (1) | KR101047770B1 (ja) |
CN (1) | CN1906043B (ja) |
AT (1) | ATE459485T1 (ja) |
DE (1) | DE602005019673D1 (ja) |
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Cited By (1)
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US8173239B2 (en) | 2007-06-11 | 2012-05-08 | Panasonic Corporation | Information recording medium, method for producing the same, and sputtering target |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW200534235A (en) | 2004-03-10 | 2005-10-16 | Matsushita Electric Ind Co Ltd | Information recording medium and method for manufacturing the same |
JP5042019B2 (ja) * | 2005-06-07 | 2012-10-03 | パナソニック株式会社 | 情報記録媒体とその製造方法 |
KR20080077969A (ko) * | 2005-12-02 | 2008-08-26 | 마츠시타 덴끼 산교 가부시키가이샤 | 정보 기록 매체와 그 제조 방법 |
WO2007088682A1 (ja) * | 2006-01-31 | 2007-08-09 | Matsushita Electric Industrial Co., Ltd. | 情報記録媒体およびその製造方法、並びにその製造装置 |
WO2008135884A1 (en) * | 2007-05-03 | 2008-11-13 | Koninklijke Philips Electronics N.V. | Optical disc for long-term storage |
US8767450B2 (en) * | 2007-08-21 | 2014-07-01 | Samsung Electronics Co., Ltd. | Memory controllers to refresh memory sectors in response to writing signals and memory systems including the same |
KR101370275B1 (ko) * | 2007-08-21 | 2014-03-05 | 삼성전자주식회사 | 상변화 메모리 소자 및 그 제조 방법 |
WO2010029607A1 (ja) * | 2008-09-09 | 2010-03-18 | 株式会社 東芝 | 情報記録再生装置 |
JP2010192025A (ja) * | 2009-02-17 | 2010-09-02 | Sony Corp | 光情報記録媒体 |
JP5302403B2 (ja) * | 2009-07-16 | 2013-10-02 | パナソニック株式会社 | 複合光学素子およびその製造方法、ならびに当該複合光学素子を備えた撮像装置および光学式記録再生装置 |
WO2012120817A1 (ja) | 2011-03-08 | 2012-09-13 | パナソニック株式会社 | 情報記録媒体とその製造方法 |
JP5838306B2 (ja) | 2011-03-08 | 2016-01-06 | パナソニックIpマネジメント株式会社 | 情報記録媒体とその製造方法 |
US11842890B2 (en) * | 2019-08-16 | 2023-12-12 | Applied Materials, Inc. | Methods and apparatus for physical vapor deposition (PVD) dielectric deposition |
CN115368031B (zh) * | 2022-09-16 | 2023-11-07 | 安徽光智科技有限公司 | 硫系玻璃8-12um波段高耐久性增透膜的制备方法 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01251335A (ja) * | 1988-03-31 | 1989-10-06 | Toshiba Corp | 情報記録媒体 |
JPH0243088A (ja) * | 1988-08-02 | 1990-02-13 | Toray Ind Inc | 情報記録媒体およびその記録・消去方法 |
JPH02147288A (ja) * | 1988-11-29 | 1990-06-06 | Matsushita Electric Ind Co Ltd | 光学情報記録部材 |
JPH03121888A (ja) * | 1989-10-04 | 1991-05-23 | Dowa Mining Co Ltd | 光ディスク用記録膜の形成方法 |
JP2001266409A (ja) * | 2000-03-22 | 2001-09-28 | Victor Co Of Japan Ltd | 光情報記録媒体 |
JP2003016687A (ja) * | 2000-07-13 | 2003-01-17 | Matsushita Electric Ind Co Ltd | 情報記録媒体およびその製造方法ならびにそれを用いた記録再生方法 |
JP2003233931A (ja) * | 2001-12-07 | 2003-08-22 | Matsushita Electric Ind Co Ltd | 情報記録媒体とその製造方法 |
JP2003341241A (ja) * | 2002-03-19 | 2003-12-03 | Matsushita Electric Ind Co Ltd | 情報記録媒体とその製造方法 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2584741B2 (ja) | 1986-03-11 | 1997-02-26 | 松下電器産業株式会社 | 書換え可能な光学情報記録部材 |
CN1010519B (zh) | 1985-09-25 | 1990-11-21 | 松下电器产业株式会社 | 可逆的光学情报记录介质 |
CN1294030C (zh) * | 1999-03-15 | 2007-01-10 | 松下电器产业株式会社 | 信息记录媒体及其制造方法 |
TW484126B (en) * | 1999-03-26 | 2002-04-21 | Matsushita Electric Ind Co Ltd | Manufacturing and recording regeneration method for information record medium |
JP3666854B2 (ja) | 2000-03-10 | 2005-06-29 | 松下電器産業株式会社 | 情報記録媒体およびその製造方法 |
TW519637B (en) | 2000-03-10 | 2003-02-01 | Matsushita Electric Ind Co Ltd | Information recording medium and its manufacturing method |
TW575873B (en) | 2000-07-13 | 2004-02-11 | Matsushita Electric Ind Co Ltd | Information recording medium, method for producing the same, and recording/reproducing method using the same |
JP3889572B2 (ja) | 2001-03-29 | 2007-03-07 | 株式会社東芝 | 相変化光記録媒体 |
KR100472817B1 (ko) | 2001-12-07 | 2005-03-10 | 마츠시타 덴끼 산교 가부시키가이샤 | 정보기록 매체와 그 제조 방법 |
KR100906056B1 (ko) | 2002-03-19 | 2009-07-03 | 파나소닉 주식회사 | 정보 기록매체와 그 제조 방법 |
US20030186164A1 (en) * | 2002-03-27 | 2003-10-02 | Hitachi, Ltd. | Information recording medium, a method for recording information and a method for manufacturing a medium |
JP2004015459A (ja) | 2002-06-07 | 2004-01-15 | Kddi Submarine Cable Systems Inc | 光信号生成装置及び方法 |
JP2005205762A (ja) | 2004-01-23 | 2005-08-04 | Hitachi Maxell Ltd | 情報記録媒体 |
JP4140060B2 (ja) | 2004-07-15 | 2008-08-27 | 日本電気株式会社 | 光学的情報記録媒体、光学的情報記録方法、及び光学的情報記録装置 |
-
2005
- 2005-05-19 DE DE602005019673T patent/DE602005019673D1/de active Active
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Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01251335A (ja) * | 1988-03-31 | 1989-10-06 | Toshiba Corp | 情報記録媒体 |
JPH0243088A (ja) * | 1988-08-02 | 1990-02-13 | Toray Ind Inc | 情報記録媒体およびその記録・消去方法 |
JPH02147288A (ja) * | 1988-11-29 | 1990-06-06 | Matsushita Electric Ind Co Ltd | 光学情報記録部材 |
JPH03121888A (ja) * | 1989-10-04 | 1991-05-23 | Dowa Mining Co Ltd | 光ディスク用記録膜の形成方法 |
JP2001266409A (ja) * | 2000-03-22 | 2001-09-28 | Victor Co Of Japan Ltd | 光情報記録媒体 |
JP2003016687A (ja) * | 2000-07-13 | 2003-01-17 | Matsushita Electric Ind Co Ltd | 情報記録媒体およびその製造方法ならびにそれを用いた記録再生方法 |
JP2003233931A (ja) * | 2001-12-07 | 2003-08-22 | Matsushita Electric Ind Co Ltd | 情報記録媒体とその製造方法 |
JP2003341241A (ja) * | 2002-03-19 | 2003-12-03 | Matsushita Electric Ind Co Ltd | 情報記録媒体とその製造方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8173239B2 (en) | 2007-06-11 | 2012-05-08 | Panasonic Corporation | Information recording medium, method for producing the same, and sputtering target |
Also Published As
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US7709073B2 (en) | 2010-05-04 |
EP1669207B1 (en) | 2010-03-03 |
EP1669207A4 (en) | 2008-07-09 |
KR20070038026A (ko) | 2007-04-09 |
US20070003730A1 (en) | 2007-01-04 |
TWI373766B (en) | 2012-10-01 |
TW200605065A (en) | 2006-02-01 |
KR101047770B1 (ko) | 2011-07-07 |
DE602005019673D1 (de) | 2010-04-15 |
CN1906043A (zh) | 2007-01-31 |
ATE459485T1 (de) | 2010-03-15 |
CN1906043B (zh) | 2011-06-08 |
JP4339356B2 (ja) | 2009-10-07 |
JPWO2006011285A1 (ja) | 2008-05-01 |
EP1669207A1 (en) | 2006-06-14 |
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