WO2011034188A1 - 光情報記録媒体用記録層、光情報記録媒体およびスパッタリングターゲット - Google Patents
光情報記録媒体用記録層、光情報記録媒体およびスパッタリングターゲット Download PDFInfo
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- WO2011034188A1 WO2011034188A1 PCT/JP2010/066259 JP2010066259W WO2011034188A1 WO 2011034188 A1 WO2011034188 A1 WO 2011034188A1 JP 2010066259 W JP2010066259 W JP 2010066259W WO 2011034188 A1 WO2011034188 A1 WO 2011034188A1
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- optical information
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B7/2437—Non-metallic elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/3407—Cathode assembly for sputtering apparatus, e.g. Target
- C23C14/3414—Metallurgical or chemical aspects of target preparation, e.g. casting, powder metallurgy
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B7/2433—Metals or elements of groups 13, 14, 15 or 16 of the Periodic System, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24306—Metals or metalloids transition metal elements of groups 3-10
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24308—Metals or metalloids transition metal elements of group 11 (Cu, Ag, Au)
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24318—Non-metallic elements
- G11B2007/2432—Oxygen
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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 a recording layer for an optical information recording medium, an optical information recording medium, and a sputtering target useful for forming the recording layer.
- Optical information recording media are typified by optical discs such as CDs, DVDs, and BDs, and are roughly classified into three types according to recording / reproducing systems: read-only type, write-once type, and rewritable type.
- the write-once type optical disc recording method mainly includes a phase change method for changing the phase of the recording layer, an interlayer reaction method for reacting a plurality of recording layers, a method for decomposing a compound constituting the recording layer, and a hole in the recording layer. It is roughly classified into a drilling method in which recording marks such as pits are locally formed.
- Patent Document 1 proposes a recording layer containing Te—OM (where M is at least one element selected from a metal element, a metalloid element, and a semiconductor element), and Patent Document 2 proposes a recording layer containing Sb and Te. Layers have been proposed.
- the first recording layer is made of an alloy containing In—O— (Ni, Mn, Mo), and the second recording layer is used.
- the second recording layer is used.
- a first recording layer a metal containing In as a main component
- a second recording layer a metal other than an oxide or a nonmetal containing at least one element belonging to Group 5B or Group 6B are stacked.
- Patent Document 5 shows a recording layer mainly composed of nitride, and recording can be performed by decomposing the nitride by heating. Materials to be performed and organic pigment materials are being studied.
- Patent Document 6 proposes an alloy made of an alloy obtained by adding a 3B group, 4B group, or 5B group element to a Sn alloy.
- Patent Document 7 proposes a recording layer made of a Sn-based alloy containing Ni and / or Co in the range of 1 to 50 atomic%.
- Patent Document 8 discloses a recording layer made of an In alloy containing 20 to 65 atomic percent of Co, and further containing an In alloy containing 19 atomic percent or less of one or more elements selected from Sn, Bi, Ge, and Si. It is shown.
- Patent Document 9 shows a recording layer that substantially consists of Pd, Ag, and O and that defines the ratio of the number of atoms of these Pd, Ag, and O.
- Japanese Unexamined Patent Publication No. 2005-135568 Japanese Unexamined Patent Publication No. 2003-331461 Japanese Unexamined Patent Publication No. 2003-326848 Japanese Patent No. 3499724 International Publication No. 2003/101750 Pamphlet Japanese Unexamined Patent Publication No. 2002-225433 Japanese Unexamined Patent Publication No. 2007-196683 Japanese Patent No. 4110194 Japanese Unexamined Patent Publication No. 2005-238516
- optical information recording media The required characteristics required for optical information recording media are mainly that it has sufficient reflectivity for reproduction, that it can be recorded with practical recording laser power, and that the recorded signal has sufficient signal amplitude for reproduction. (High modulation degree) is required.
- the recording material disclosed as the prior art it is difficult for the recording material disclosed as the prior art to satisfy these required characteristics with the recording material alone.
- the reflectance of the recording layer alone is low.
- a reflection film is required, and in order to increase the degree of modulation, it is necessary to provide dielectric layers such as ZnS—SiO 2 above and below the recording layer, and the number of layers constituting the optical disk increases.
- the interlayer reaction method also requires a plurality of recording layers, the number of layers constituting the optical disk increases. For this reason, there is a problem that the number of film layers increases and productivity decreases.
- the perforation method has a high reflectivity of the recording layer itself and can secure a large degree of modulation, so that the number of layers constituting the optical disk can be reduced, but in achieving higher recording sensitivity, Further study is needed. Further, as in Patent Document 9, it is considered that it is difficult to improve the recording characteristics more stably only by forming an oxide of Pd or Ag.
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide optical information capable of increasing the productivity of an optical information recording medium by satisfying the above required characteristics while reducing the number of layers of an optical disk.
- the object is to provide a recording layer for a recording medium, an optical information recording medium provided with the recording layer, and a sputtering target useful for forming the recording layer.
- a recording layer for an optical information recording medium on which recording is performed by laser light irradiation The total value of X metal atoms, Pd atoms, and Ag atoms contained in the recording layer, including oxides of X metal, oxide Pd and oxide Ag, whose absolute value of standard free energy of formation of oxide relative to 1 mol of oxygen is larger than Pd and Ag
- An optical information recording medium comprising the recording layer according to any one of (1) to (4).
- a sputtering target for forming a recording layer for an optical information recording medium according to any one of (1) to (4),
- the total amount of X metal atoms, Pd atoms, and Ag atoms contained in the sputtering target is 10 to 60 atomic percent of Pd atoms, 5 to 45 atomic percent of Ag atoms, and the total of Pd and Ag atoms.
- Sputtering target whose amount ratio is 75 atomic% or less.
- the sputtering target according to (7), wherein the X metal is at least one selected from the group consisting of In, Sn, Zn, Bi, Ge, Co, W, Cu, and Al.
- the sputtering target according to (8), wherein the X metal is In.
- a high modulation degree can be achieved with a practical and relatively low recording laser power (hereinafter, such characteristics are sometimes referred to as “excellent recording sensitivity”).
- excellent recording sensitivity it is possible to provide a recording layer for a write once optical information recording medium) and an optical information recording medium (particularly a write once optical information recording medium) provided with the recording layer.
- a sputtering target useful for forming the recording layer can be provided.
- the inventors of the present invention have intensively studied to realize a recording layer for optical information recording media that is superior in recording sensitivity to conventional recording layers.
- an oxide of a metal hereinafter, referred to as X metal
- X metal oxide of a metal
- the recording layer when the recording layer is irradiated with a laser, the oxidized Pd and the oxidized Ag contained in the oxide of X metal are heated by the laser irradiation, decomposed and released oxygen to be stable. It has been found that the recording sensitivity can be greatly improved by changing the structure of the recording layer, specifically, by generating bubbles in the part irradiated with the laser and performing irreversible recording. It was.
- the recording method using the recording layer is different from the phase change method using the fact that the structure of the recording layer before the laser irradiation is amorphous and is amorphous after the laser irradiation. .
- the reason why the recording layer of the present invention is excellent in recording sensitivity is that the transmittance is increased (that is, the reflectance is decreased) in the portion where bubbles are generated by laser irradiation compared to the portion where bubbles are not generated. It is conceivable that the modulation degree could be increased.
- the total amount of X metal atoms, Pd atoms and Ag atoms contained in the recording layer is ⁇ Pd atom ratio: 10 to 60 atom%, The ratio of Ag atoms: 5 to 45 atomic%, and the total amount of Pd atoms and Ag atoms: 75 atomic% or less must be satisfied.
- the ratio of the Pd atoms is set to 10 atomic% or more.
- the ratio of Pd atoms is preferably 15 atomic% or more.
- the effect of improving the recording sensitivity by oxidized Pd can be sufficiently enhanced by releasing oxygen by reducing oxidized Ag.
- the ratio of Ag atoms is set to 5 atomic% or more.
- Ag atoms are preferably 8 atomic% or more.
- the upper limit of Pd atoms is 60 atomic% (the preferable upper limit is 50 atomic%, and the more preferable upper limit is 45 atoms).
- the upper limit of Ag atoms is 45 atomic% (preferably upper limit is 40 atomic%), and the upper limit of the total amount of Pd atoms and Ag atoms is 75 atomic% (that is, X metal atoms, Pd atoms and Ag atoms The lower limit of the ratio of X metal atoms to the total amount was 25 atomic%).
- the upper limit of the total amount of Pd atoms and Ag atoms is preferably 60 atom%.
- the oxidized Pd contains Pd monoxide and Pd dioxide in particular because the recording sensitivity can be more sufficiently improved.
- Pd dioxide which is more unstable than monoxide Pd, is easily decomposed by laser irradiation to release oxygen, and Pd dioxide is present in the monoxide Pd that is more stable than Pd dioxide.
- the natural decomposition of Pd dioxide is suppressed and a stable recording layer can be obtained.
- the ratio of the Pd dioxide to the total of the Pd monoxide and the Pd dioxide is 3 mol% or more. . More preferably, it is 5 mol% or more.
- the amount of Pd dioxide relative to the sum of Pd and Pd is preferably 70 mol% or less. More preferably, it is 60 mol% or less.
- the recording layer of the present invention requires an oxide of a metal (X metal) whose absolute value of the standard free energy of formation of oxide relative to 1 mol of oxygen is larger than Pd and Ag together with the oxidized Pd and oxidized Ag.
- a metal oxide (X metal oxide) that is more stable than oxidized Pd and oxidized Ag together with oxidized Pd and oxidized Ag, oxygen is released when the oxidized Pd and oxidized Ag are decomposed.
- the shape change can be made clear and large, and a sufficient reflectance change by recording, that is, a high degree of modulation can be achieved.
- Examples of the metal (X metal) having a larger absolute value of the standard free energy of formation of oxide relative to 1 mol of oxygen than Pd and Ag include In, Sn, Zn, Bi, Ge, Co, W, Cu, and Al (room temperature).
- the standard free energy of formation of oxide with respect to 1 mol of oxygen in Pd is about ⁇ 150 kJ / mol and Ag is ⁇ 40 kJ / mol, whereas In, Sn, Zn, Bi, Ge, Co, W, Cu, Al are -500, -520, -640, -330, -420, -420, -500, -270, and -1050 kJ / mol, respectively).
- In and Bi that is, an oxide of X metal contained together with the Pd oxide and the Ag oxide is preferably In oxide or Bi oxide.
- the recording layer of the present invention may contain metal Pd in addition to the oxide of X metal, oxide Pd and oxide Ag.
- inevitable impurities that are inevitably mixed during production may be included.
- the component composition of the recording layer of the present invention does not stipulate even the trace components that are inevitably mixed, and as long as the above characteristics of the present invention are not impaired, the trace amounts of these unavoidable impurities are allowed.
- the recording layer of the present invention has a total content of Sn, Al, Bi, Cu, Nb, Ti, Si, Ta within about 30 atomic% or less for the purpose of improving the absorption rate and controlling the refractive index, for example, oxidation. It may be included as a thing.
- the thickness of the recording layer depends on the structure of the optical information recording medium, such as inserting other layers such as a dielectric layer and an optical adjustment layer above and below the recording layer, but when the recording layer is used as a single layer ( When the dielectric layer and the optical adjustment layer are not provided), it is preferable that the recording layer has a thickness of 5 to 100 nm. This is because if the film thickness of the recording layer is smaller than 5 nm, it is difficult to obtain a sufficient reflectance change by recording. More preferably, it is 10 nm or more, More preferably, it is 20 nm or more, Most preferably, it is 25 nm or more.
- the film thickness of the recording layer is larger than 100 nm, it takes a long time to form the film, the productivity is lowered, and the laser power required for recording may be increased, which is not preferable.
- the film thickness of the recording layer is more preferably 70 nm or less, still more preferably 60 nm or less.
- the recording layer of the present invention is preferably formed by a sputtering method.
- sputtering conditions Ar flow rate: 10 to 100 sccm and oxygen flow rate: 10 to 100 sccm can be mentioned.
- general sputtering conditions can be adopted.
- the gas pressure is in the range of 0.1 to 1.0 Pa, for example, and the sputtering power is in the range of 0.5 to 20 W / cm 2 , for example. To control.
- an X metal atom (preferably In, Sn, Zn, Bi, or the like) contained in the sputtering target is used as a sputtering target (hereinafter sometimes simply referred to as “target”).
- target a sputtering target
- -Pd atom ratio 10 to 60 atom%
- a ratio of Ag atoms: 5 to 45 atomic% and a total amount of Pd atoms and Ag atoms: 75 atomic% or less are used.
- the target include X metal as an oxide (that is, an oxide of X metal), Pd atoms as metal Pd and / or oxide Pd, and Ag atoms as metal Ag and / or oxide Ag. Are included.
- the ratio of the above elements is a value obtained in terms of atoms excluding oxygen atoms in the oxide. .
- the in-plane uniformity and thickness of the productivity and the composition of the formed thin film are obtained by mixing and sintering powders of X metal oxide, metal Pd and metal Ag. It is preferable in terms of control.
- the target may contain inevitable impurities that are inevitably mixed during manufacture.
- the component composition of the sputtering target of the present invention does not prescribe even the trace components that are inevitably mixed, and the trace amounts of these unavoidable impurities are allowed as long as the above characteristics of the present invention are not impaired.
- an X metal target for example, an X metal target, a metal Pd target (pure Pd metal target), and a metal Ag target (pure Ag metal target) are used, and these are simultaneously discharged. And performing multi-source sputtering.
- the optical information recording medium of the present invention has a recording layer exhibiting the above excellent characteristics, but in order to ensure excellent durability capable of maintaining the above excellent characteristics even in a high temperature and high humidity environment. It is preferable that a dielectric layer is formed adjacent to the recording layer. In the high temperature and high humidity environment, the oxidized Pd and oxidized Ag in the portion not irradiated with laser (that is, recording is not performed) are gradually reduced to release oxygen, and as a result, the optical characteristics change. Appearing as a decrease in reflectance is considered as a cause of a decrease in durability. However, it seems that by forming the dielectric layer, unnecessary decomposition of oxidized Pd (particularly Pd dioxide) and oxidized Ag can be suppressed and stably maintained.
- the above-mentioned “formation of the dielectric layer adjacent to the recording layer” includes, for example, the case where the dielectric layer is formed between the substrate and the recording layer and adjacent to the recording layer, and / or the recording layer and will be described later. A case where it is formed between the light transmission layer and adjacent to the recording layer can be mentioned.
- the dielectric layer also improves durability by acting as an oxygen barrier layer. By preventing the escape of oxygen caused by the decomposition of the oxidized Pd and oxidized Ag, it is possible to prevent a change in reflectance (particularly, a decrease in reflectance) and to secure the reflectance necessary for the recording layer. It is done.
- recording characteristics can be improved by forming a dielectric layer. This is because the thermal diffusion of the laser incident by the dielectric layer is optimally controlled to prevent the bubbles in the recording portion from becoming too large or the decomposition of the oxidized Pd from proceeding too much to collapse the bubbles. This is considered to be possible to optimize.
- Examples of the material of the dielectric layer include oxides, nitrides, sulfides, carbides, fluorides, or mixtures thereof.
- Examples of the oxides include In, Zn, Sn, Al, Si, Ge, Ti, and Ta.
- the nitride is a nitride of one or more elements selected from the group consisting of In, Sn, Ge, Cr, Si, Al, Nb, Mo, Ti, and Zn (preferably Si and / or Ge nitridation).
- the carbide is a carbide of one or more elements selected from the group consisting of In, Sn, Ge, Cr, Si, Al, Ti, Zr, Ta and W (preferably from the group consisting of Si, Ti and W).
- the carbide of one or more elements selected) and the fluoride include a fluoride of one or more elements selected from the group consisting of Si, Al, Mg, Ca, and La. Examples of such a mixture include ZnS—SiO 2 and the like.
- the film thickness of the dielectric layer is preferably 1 to 40 nm. This is because if the thickness is less than 1 nm, the effect of the dielectric layer (particularly, the effect as an oxygen barrier) may not be sufficiently exhibited. More preferably, it is 3 nm or more. On the other hand, if the thickness of the dielectric layer is too large, it is difficult to cause a change in the recording layer due to laser irradiation, which may cause a decrease in recording characteristics. Therefore, the thickness of the dielectric layer is preferably 40 nm or less, more preferably 35 nm or less.
- the present invention does not define the method for forming the dielectric layer, but it is preferable to form the dielectric layer by the sputtering method as in the recording layer.
- the sputtering conditions are Ar flow rate, for example, in the range of 10 to 100 sccm, and when using a metal target as described below, the oxygen flow rate during oxide layer formation is For example, the range is 5 to 60 sccm, and the nitrogen flow rate when forming the nitride layer is, for example, 5 to 80 sccm.
- the gas pressure may be in the range of 0.1 to 1.0 Pa, and the sputtering power may be in the range of 0.5 to 50 W / cm 2 , for example.
- a sputtering target used for forming the dielectric layer in addition to a target made of the above compound (oxide, nitride, sulfide, carbide, fluoride), other than oxygen, nitrogen, sulfur, carbon, fluorine in the compound
- a metal target containing a constituent element a target made of a pure metal or an alloy
- the optical information recording medium of the present invention is characterized in that it includes the above-mentioned recording layer, and preferably further includes a dielectric layer. Except for the recording layer and the dielectric layer, structures known in the field of optical information recording media can be employed.
- optical information recording medium As an optical information recording medium (optical disk), a structure in which a recording layer is laminated on a substrate in which a laser guide groove is engraved, and a light transmission layer is further laminated on the substrate.
- examples of the material of the substrate include polycarbonate resin, norbornene resin, cyclic olefin copolymer, and amorphous polyolefin.
- the light transmission layer polycarbonate or ultraviolet curable resin can be used.
- the light transmission layer it is preferable that the light transmission layer has a high transmittance with respect to a laser for recording and reproduction, and has a small light absorption rate.
- the thickness of the substrate is, for example, 0.5 to 1.2 mm. In addition, the thickness of the light transmission layer is, for example, 0.1 to 1.2 mm.
- the recording layer of the present invention exhibits a high reflectance and exhibits excellent recording characteristics by itself. However, if necessary, the recording layer is interposed between the substrate and the recording layer in order to further increase the reflectance as an optical disk. Further, an optical adjustment layer may be provided. Examples of the material of the optical adjustment layer include Ag, Au, Cu, Al, Ni, Cr, Ti, and alloys thereof. The thickness of the optical adjustment layer is usually about 50 to 150 nm as a complete reflection film.
- a single-layer optical disc in which one recording layer and one light transmission layer are formed is shown.
- the present invention is not limited to this, and two or more optical discs in which a plurality of recording layers and light transmission layers are laminated are shown. It may be.
- the recording layer is made of, for example, an ultraviolet curable resin between the recording layer group consisting of the optical adjustment layer and the dielectric layer laminated as necessary and another recording layer group. You may have a transparent intermediate
- the feature of the present invention is that the above-mentioned recording layer (preferably, further a dielectric layer) is employed.
- the substrate, the light transmission layer, the optical adjustment layer, and the transparent intermediate layer are used.
- the formation method of the layer and the like is not particularly limited, and an optical information recording medium may be manufactured by forming by a usual method.
- optical information recording medium examples include CD, DVD, and BD.
- a BD capable of recording and reproducing data by irradiating a recording layer with blue laser light having a wavelength of about 380 nm to 450 nm, preferably about 405 nm.
- a specific example is -R.
- the sputtering conditions for forming the recording layer were as follows: Ar flow rate: 10 sccm, oxygen flow rate: 10 sccm, gas pressure: 0.4 Pa, DC sputtering power: 100 to 200 W, substrate temperature: room temperature.
- the component composition of the formed recording layer [the ratio of In atom (atomic%), the ratio of Pd atom (atomic%), the ratio of Ag atom (atomic%) to In atom + Pd atom + Ag atom)] is X-ray fluorescence analysis. It was determined by measurement by the method or ICP emission analysis method.
- an ultraviolet curable resin (“BRD-864” manufactured by Nippon Kayaku Co., Ltd.) is spin-coated on the dielectric layer (No. 7 on the recording layer), and then irradiated with ultraviolet rays to give a film thickness of about A 0.1 mm light-transmitting layer was formed to obtain an optical disc.
- No. 6 is a recording layer formed of In oxide, Pd oxide, and Cu oxide by sputtering using three targets of a pure In metal target, a pure Pd metal target, and a pure Cu metal target as the target for forming the recording layer. Formed.
- optical disc evaluation apparatus (“ODU-1000” manufactured by Pulstec Industrial Co., Ltd.) was used, a recording laser center wavelength was set to 405 nm, and a lens with NA (numerical aperture): 0.85 was used.
- NA number of NA
- the degree of modulation (reflectance change rate) at the recording power at which the jitter is minimized is obtained from the following formula (1), the minimum jitter is less than 7%, and the degree of modulation is 0.40 or more.
- Modulation degree (change rate of reflectance) (reflectance of unrecorded portion ⁇ reflectance of recorded portion) / (reflectance of unrecorded portion) (1)
- the recording layers (Nos. 1 to 4 and 7) satisfying the component composition defined in the present invention have a high degree of modulation and excellent recording sensitivity at a practical recording laser power.
- a recording layer for an optical information recording medium (in particular, a recording layer for a write once optical information recording medium) that can achieve a high degree of modulation with a practical and relatively low recording laser power, and the recording layer are provided.
- An optical information recording medium (particularly, a write-once optical information recording medium) can be provided.
- a sputtering target useful for forming the recording layer can be provided.
Abstract
Description
(1)レーザー光の照射により記録が行われる光情報記録媒体用記録層であって、
酸素1molに対する酸化物の標準生成自由エネルギーの絶対値がPdおよびAgよりも大きいX金属の酸化物、酸化Pdおよび酸化Agを含み、記録層に含まれるX金属原子、Pd原子およびAg原子の合計量に対し、Pd原子の比率が10~60原子%、Ag原子の比率が5~45原子%、かつPd原子とAg原子の合計量の比率が75原子%以下である光情報記録媒体用記録層。
(2)前記X金属が、In、Sn、Zn、Bi、Ge、Co、W、CuおよびAlよりなる群から選択される1種以上である(1)に記載の光情報記録媒体用記録層。
(3)前記X金属がInである(2)に記載の光情報記録媒体用記録層。
(4)レーザー光の照射された部分に気泡が生成し、体積変化することにより記録が行われる(1)~(3)のいずれかに記載の光情報記録媒体用記録層。
(5)(1)~(4)のいずれかに記載の記録層を備える光情報記録媒体。
(6)前記記録層に隣接して形成される誘電体層を備える(5)に記載の光情報記録媒体。
(7)(1)~(4)のいずれかに記載の光情報記録媒体用記録層形成用のスパッタリングターゲットであって、
スパッタリングターゲットに含まれるX金属原子、Pd原子およびAg原子の合計量に対し、Pd原子の比率が10~60原子%、Ag原子の比率が5~45原子%、かつPd原子とAg原子の合計量の比率が75原子%以下であるスパッタリングターゲット。
(8)前記X金属が、In、Sn、Zn、Bi、Ge、Co、W、CuおよびAlよりなる群から選択される1種以上である(7)に記載のスパッタリングターゲット。
(9)前記X金属がInである(8)に記載のスパッタリングターゲット。
・Pd原子の比率:10~60原子%、
・Ag原子の比率:5~45原子%、および
・Pd原子とAg原子の合計量:75原子%以下
を満たすようにする必要がある。
また、作製時に不可避的に混入する不可避不純物が含まれ得る。しかし、本発明の記録層の成分組成は、それら不可避に混入してくる微量成分まで規定するものではなく、本発明の上記特性が阻害されない限り、それら不可避不純物の微量混入は許容される。
・Pd原子の比率:10~60原子%、
・Ag原子の比率:5~45原子%、および
・Pd原子とAg原子の合計量:75原子%以下
を満たすものを用いる。
ディスク基板として、ポリカーボネート基板(厚さ:1.1mm、直径:120mm、トラックピッチ:0.32μm、溝深さ:25nm)を用い、該基板上に、DCマグネトロンスパッタリング法により、酸化In、酸化Pdおよび酸化Agからなる種々の記録層を形成した。記録層の膜厚は40nmとした。上記記録層は、純In金属ターゲット、純Pd金属ターゲット、および純Ag金属ターゲットの3つのターゲット(表1のNo.5、8は、このうちの2つのターゲット)の同時放電による多元スパッタリングを行って形成した。
作製した光ディスクについて下記の通り評価した。即ち、光ディスク評価装置(パルステック工業社製「ODU-1000」)を用い、記録レーザー中心波長は405nmとし、NA(開口数):0.85のレンズを用いた。下記に示す反射率は、上記装置を用い、レーザーをトラック上に照射し、光ディスクにおける未記録部分のレーザー光の戻り光強度から求めた。
変調度(反射率の変化率)=(未記録部分の反射率-記録部分の反射率)/(未記録部分の反射率) …(1)
これらの結果を表1に併記する。
本出願は、2009年9月18日出願の日本特許出願(特願2009-217351)に基づくものであり、その内容はここに参照として取り込まれる。
Claims (9)
- レーザー光の照射により記録が行われる光情報記録媒体用記録層であって、
酸素1molに対する酸化物の標準生成自由エネルギーの絶対値がPdおよびAgよりも大きいX金属の酸化物、酸化Pdおよび酸化Agを含み、記録層に含まれるX金属原子、Pd原子およびAg原子の合計量に対し、Pd原子の比率が10~60原子%、Ag原子の比率が5~45原子%、かつPd原子とAg原子の合計量の比率が75原子%以下である光情報記録媒体用記録層。 - 前記X金属が、In、Sn、Zn、Bi、Ge、Co、W、CuおよびAlよりなる群から選択される1種以上である請求項1に記載の光情報記録媒体用記録層。
- 前記X金属がInである請求項2に記載の光情報記録媒体用記録層。
- レーザー光の照射された部分に気泡が生成し、体積変化することにより記録が行われる請求項1に記載の光情報記録媒体用記録層。
- 請求項1~4のいずれか一項に記載の記録層を備える光情報記録媒体。
- 前記記録層に隣接して形成される誘電体層を備える請求項5に記載の光情報記録媒体。
- 請求項1~4のいずれか一項に記載の光情報記録媒体用記録層形成用のスパッタリングターゲットであって、
スパッタリングターゲットに含まれるX金属原子、Pd原子およびAg原子の合計量に対し、Pd原子の比率が10~60原子%、Ag原子の比率が5~45原子%、かつPd原子とAg原子の合計量の比率が75原子%以下であるスパッタリングターゲット。 - 前記X金属が、In、Sn、Zn、Bi、Ge、Co、W、CuおよびAlよりなる群から選択される1種以上である請求項7に記載のスパッタリングターゲット。
- 前記X金属がInである請求項8に記載のスパッタリングターゲット。
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US13/496,079 US8530024B2 (en) | 2009-09-18 | 2010-09-17 | Recording layer for optical information recording medium, optical information recording medium, and sputtering target |
KR1020127006948A KR20120057630A (ko) | 2009-09-18 | 2010-09-17 | 광 정보 기록 매체용 기록층, 광 정보 기록 매체 및 스퍼터링 타깃 |
CN2010800406640A CN102483939A (zh) | 2009-09-18 | 2010-09-17 | 光信息记录介质用记录层、光信息记录介质及溅射靶 |
EP10817301.4A EP2479752A4 (en) | 2009-09-18 | 2010-09-17 | RECORDING LAYER FOR OPTICAL INFORMATION RECORDING MEDIUM, OPTICAL INFORMATION RECORDING MEDIUM AND SPUTTER TARGET |
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JP2009217351A JP5399836B2 (ja) | 2009-09-18 | 2009-09-18 | 光情報記録媒体用記録層、光情報記録媒体およびスパッタリングターゲット |
JP2009-217351 | 2009-09-18 |
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JP5485091B2 (ja) | 2010-09-16 | 2014-05-07 | ソニー株式会社 | 光記録媒体 |
JP5935234B2 (ja) * | 2011-02-03 | 2016-06-15 | ソニー株式会社 | 光情報記録媒体 |
TWI579839B (zh) * | 2015-02-17 | 2017-04-21 | 駿康科技有限公司 | 資訊記錄媒體記錄層之形成方法 |
JP6781679B2 (ja) * | 2017-09-11 | 2020-11-04 | 株式会社神戸製鋼所 | 記録層、光情報記録媒体及びスパッタリングターゲット |
WO2019235226A1 (ja) * | 2018-06-07 | 2019-12-12 | 株式会社神戸製鋼所 | 記録層、光情報記録媒体及びスパッタリングターゲット |
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EP2479752A1 (en) | 2012-07-25 |
CN102483939A (zh) | 2012-05-30 |
KR20120057630A (ko) | 2012-06-05 |
JP2011065730A (ja) | 2011-03-31 |
TW201129703A (en) | 2011-09-01 |
US8530024B2 (en) | 2013-09-10 |
JP5399836B2 (ja) | 2014-01-29 |
EP2479752A4 (en) | 2014-01-15 |
US20120177863A1 (en) | 2012-07-12 |
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