WO2003056555A1 - Support d'enregistrement magneto- optique - Google Patents
Support d'enregistrement magneto- optique Download PDFInfo
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- WO2003056555A1 WO2003056555A1 PCT/JP2001/011417 JP0111417W WO03056555A1 WO 2003056555 A1 WO2003056555 A1 WO 2003056555A1 JP 0111417 W JP0111417 W JP 0111417W WO 03056555 A1 WO03056555 A1 WO 03056555A1
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- Prior art keywords
- film
- magneto
- resin
- soft magnetic
- substrate
- Prior art date
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
- G11B11/10589—Details
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/1055—Disposition or mounting of transducers relative to record carriers
- G11B11/1058—Flying heads
Definitions
- the present invention relates to a magneto-optical recording medium, and more particularly to a magneto-optical recording medium having a soft magnetic film.
- magneto-optical recording media have a recording layer and a protective layer laminated on a transparent substrate and record and reproduce information by irradiating light from the substrate side.
- the track width and recording mark size must be reduced.For example, the spot size of the light beam applied to the magneto-optical recording medium is reduced. This is being done.
- NA of an objective lens used for a magneto-optical recording medium is about 0.55 to 0.6.
- a method in which light is incident from the recording film side to perform recording and reproduction is referred to as a front illumination method.
- an optical flying head which has a structure in which a coil for generating a magnetic field and an objective lens are combined, and a proximity actuator are used.
- a magneto-optical recording medium that requires the application of a high recording magnetic field (for example, 300 Oe or more) requires a large current (about 900 mA) to flow through the coil of the proximity actuator.
- the current in order to improve the recording / reproducing speed, the current must be turned ON / OFF at a high speed, and a high-speed transient response is required.
- the upper limit of the recording magnetic field intensity is 200 O It must be kept below e. That is, in order to satisfy the required specification of 100 Mbps, the magnetic field strength must be reduced.
- a soft magnetic layer such as NiFe is formed on a substrate and under a recording layer.
- the thickness of the soft magnetic layer needs to be 100 nm or more.
- An uneven servo pattern composed of lands and grooves is formed on the surface of a substrate of a conventional general magneto-optical recording medium, and a soft magnetic layer is formed on this servo pattern.
- the land becomes wider, the width ratio between the land and the group changes greatly, and the taper angle of the group becomes extremely obtuse, and the land ⁇ The edge becomes extremely round.
- the recording layer is formed on the soft magnetic layer on which the shape of the servo pattern of the substrate is not accurately reflected, so that recording and reproduction satisfying the required performance cannot be performed.
- a soft magnetic layer having a thickness of about 100 nm or more is provided on an aluminum substrate, and a groove layer is provided thereon to improve CZN.
- a substrate for a magneto-optical recording medium is described.
- the aluminum substrate has low rigidity, there is a risk of contact when the objective lens is arranged close to the medium, and it is not preferable to use the proximity activator.
- the soft magnetic layer is exposed to the air, so that the magnetic properties may be changed by oxidation and nitridation.
- the present invention has been made in view of the above circumstances, and by providing a protective layer on a soft magnetic layer, prevents oxidation and nitridation of the soft magnetic layer, and achieves stable magnetic characteristics. And a magneto-optical recording medium having the same.
- At least a soft magnetic film, a protective film, a resin layer having a servo pattern formed thereon, a reflective film, a base dielectric film, a recording film, an upper dielectric film and a cover layer are formed on a substrate. It is intended to provide a magneto-optical recording medium characterized by being formed in this order.
- the second member having the body film, the recording film, the upper dielectric film, and the cover layer formed in this order is bonded to the protective film and the second substrate via an anaerobic cured resin. It is intended to provide a magneto-optical recording medium characterized by being constituted as described above.
- the soft magnetic film is formed of FeC
- the protective film is formed of a SiO 2 film having a thickness of about 10 nm, and the resin layer, the reflective film, and the underlayer are so arranged that the distance between the soft magnetic film and the recording film is about 10 m or less. Adjusting the thickness of the dielectric film is preferable for magnetic properties
- each of the constituent films from the protective film to the cover layer is so arranged that the distance between the soft magnetic film and the magnetic field generating coil provided on the recording / reproducing head is maintained at about 22 ⁇ 4 m.
- the film thickness may be adjusted.
- the present invention provides a method of forming a soft magnetic film on a substrate by a sputtering method, forming a protective film on the soft magnetic film, and dropping a predetermined amount of a thermosetting resin on a stamper on which a predetermined servo pattern is formed.
- the pressed member is pressed so that the surface of the thermosetting resin and the protective film are in contact with each other, and the thermosetting resin is cured by applying predetermined heat.
- thermosetting resin A film, a base dielectric film, a recording film, and an upper dielectric film are formed in this order by a sputtering method, and a cover layer is formed by applying an ultraviolet curing resin on the upper dielectric film.
- a method of manufacturing a magneto-optical recording medium of is to fabricate the first member was formed a soft magnetic film and the protective film in this order by sputtering on the first substrate, where An ultraviolet curable resin is dropped on a stamper on which a servo pattern is formed, a light-transmissive second substrate is pressed onto the ultraviolet curable resin, and ultraviolet light is irradiated from above the second substrate to emit the ultraviolet light.
- a first member having a resin layer formed by curing a cured resin is manufactured, and an anaerobic cured resin is dropped on a second substrate of the second member, and the first part is interposed through the anaerobic cured resin.
- FIG. 1 is a schematic sectional view of a magneto-optical recording medium according to a first embodiment of the present invention.
- FIG. 2 is a schematic explanatory diagram of the function of the soft magnetic film according to the first embodiment of the present invention.
- FIG. 3 is an explanatory diagram of a positional relationship with a flying head and the like in the first embodiment of the present invention.
- FIG. 4 is a manufacturing process diagram of the magneto-optical recording medium according to the first embodiment of the present invention.
- FIG. 5 is a manufacturing process diagram of the magneto-optical recording medium according to the first embodiment of the present invention.
- FIG. 6 is a graph showing the relationship between the recording magnetic field strength and CNR of three magneto-optical recording media.
- FIG. 7 is a schematic sectional view of a magneto-optical recording medium according to a second embodiment of the present invention.
- FIG. 8 is a manufacturing process diagram of the magneto-optical recording medium according to the second embodiment of the present invention.
- FIG. 9 shows a manufacturing process diagram of the magneto-optical recording medium according to the second embodiment of the present invention.
- FIG. 10 is a manufacturing process diagram of the magneto-optical recording medium according to the second embodiment of the present invention.
- FIG. 11 is an explanatory diagram of a positional relationship with a flying head and the like in a second embodiment of the present invention.
- FIG. 12 is a manufacturing process diagram of the magneto-optical recording medium according to the third embodiment of the present invention.
- FIG. 13 is a manufacturing process diagram of the magneto-optical recording medium according to the third embodiment of the present invention.
- FIG. 14 is a manufacturing process diagram of the magneto-optical recording medium according to the third embodiment of the present invention.
- FIG. 1 is a schematic sectional view of a magneto-optical recording medium according to a first embodiment of the present invention.
- the magneto-optical recording medium comprises a substrate 1, a soft magnetic film 2, a protective film 3, a resin layer 4, a reflective film 5, a base dielectric film 6, a recording film 7, an upper dielectric film. 8, a cover layer 9 is formed in this order.
- the substrate 1 is made of a material as rigid as possible, such as glass or silicon.
- the soft magnetic film 2 is made of a material having magnetism for concentrating the magnetic flux, but is preferably made of FeC, FeNi, FeAISi, CoZrNb, or the like. Can be.
- the protective film 3 is formed of a material that can prevent the soft magnetic film 2 from being oxidized and nitrided.
- a material that can prevent the soft magnetic film 2 from being oxidized and nitrided For example, SiO 2 , Si N, or the like can be used.
- the resin layer 4 a thermosetting resin using an acrylic resin as a base material, an ultraviolet curable resin, an anaerobic curable resin, or the like can be used.
- the reflective film 5 can be made of a material such as aluminum, AlTi, AlCr, or the like.
- Base dielectric film 6 and the upper base dielectric film 8 can be used as the S i N, S i 0 2 .
- the recording film 7 may be a single-layer magnetic film (TbFeCo), but is formed on the underlying dielectric film 6 when a magnetic super-resolution film having a three-layer structure is used.
- TbFeCo or DyFeCo as the recording layer ⁇ 1
- GdFeCo or GdFeCoSi as the intermediate layer 7 thereon, and the reproducing layer 7 thereon As 3
- GdFeCo or GdFeCoCr can be used.
- the cover layer 9 is for protecting the entire constituent layer on the substrate, and a transparent ultraviolet curable resin can be used, but a thermosetting or anaerobic resin may be used.
- This medium is a front illumination type medium in which light is incident from the side of the cover layer 9 opposite to the substrate 1.
- the protective film 3 is for preventing the soft magnetic film 2 from oxidizing and nitriding, and for preventing the magnetic properties of the soft magnetic film 2, particularly the magnetic permeability, from being changed.
- the surface of the resin layer 4 of the present invention includes lands and groups. A concave / convex shaped servo pattern is formed.
- the reflection film 5 and the recording film 7 formed on the resin layer 4 also have a surface shape reflecting the irregularities of the servo panel as shown in FIG.
- the substrate is made of a material as rigid as possible. This is because when the substrate has low stiffness, the flying height of the flying head fluctuates greatly, so that the aberration of the optical beam spot is large and the recording / reproducing performance deteriorates. On the other hand, with a rigid substrate, fluctuations in the flying height of the flying head can be suppressed, so that fluctuations in the aberration of the optical beam spot are small and signal quality degradation can be suppressed.
- the recording film 7 is composed of a magnetic super-resolution film having a three-layer structure
- the information recorded on the recording layer 71 is transferred to the reproducing layer 73 through the intermediate layer ⁇ 2, and the reproducing layer 7 is irradiated with light.
- the transferred information is reproduced through minute regions other than the low-temperature and high-temperature mask regions formed in Step 3.
- the soft magnetic film 2 is formed to concentrate the magnetic flux from the coil as directly under the coil as possible, and to prevent the characteristics of the recording layer 7 from deteriorating, the resin layer 4 on which the servo pattern is formed is formed. It is formed at a position below and in contact with the substrate 1.
- the magnetic flux that has progressed from the coil toward the medium concentrates on the portion immediately below the coil, reaches the soft magnetic film 2 and travels in the horizontal direction. It is considered that the magnetic field is effectively applied to This can be seen by observing the recording magnetic field dependence of the recording signal characteristics.
- the effect of the magnetic field concentration of the soft magnetic film 2 is that the recording film 7 and the soft magnetic film It is considered that the closer to 2 the distance is, the greater the distance. Therefore, it is preferable that the total thickness of the protective film 3, the resin layer 4, the reflection film 5, and the base dielectric film 6 provided between the recording film 7 and the soft magnetic film 2 is as small as possible, and is about 10 m or less. It is good to do. That is, the distance between the soft magnetic film and the recording film is set to 10 m or less.
- the coil and the soft included in the actuator 21 are set.
- the thickness of each constituent layer from the protective film 3 to the cover layer 9 and the total thickness are adjusted so that the distance A from the magnetic film 2 is about 70 ⁇ 4 ⁇ m.
- the coil included in the flying head 22 and the soft magnetic are adjusted so that the distance B from the film 2 is about 22 soils and about 4 zm.
- the resin layer 4 and the cover layer 9 can also use an anaerobic cured resin.
- the anaerobic curing resin is cured by mixing a polymerization initiator (primer) that promotes a polymerization reaction at room temperature with an acrylic resin serving as a base material.
- a polymerization initiator for example, TB1390E, TB 3062 B can be used as the base resin.
- Soft magnetic film 2 FeC, thickness 100 nm, permeability 900
- Protective film 3 S i 0 2, thickness 10 nm
- Resin layer 4 Thermosetting resin, thickness 10 m or less, depth of uneven grooves 30 nm
- Reflective film 5 A 1, thickness 15 nm
- Base dielectric film 6 SiN, thickness 60 nm
- Recording film 7 130 nm (Recording layer 71: TbFe Co: 50 nm, Intermediate layer 72: GdF e Co: 40 nm, Reproducing layer 73: GdF e Co: 40 nm)
- Upper dielectric film 8 SiN, thickness 80 nm
- Cover layer 9 UV curable resin, thickness 10m
- a glass substrate 1 (plate thickness: 1.2 mm, diameter: 90 mm, surface roughness: 2.5 A) is prepared.
- a soft magnetic film 2 of FeC is formed to a thickness of about 100 nm on the substrate 1 by a sputtering method.
- a general vacuum sputter device is used, and the substrate 1 and the Fe target and the C target are deviated at predetermined positions in the device. It was installed and performed with a cosputter.
- the film forming gas was Ar, the gas pressure was 0.5 Pa, and the input power was 200 to 1800 W.
- the soft magnetic film 2: and S i 0 2 manufactured by about 10 nm film protective film is 3 to prevent oxidation and nitriding by Supadzutari ring method.
- a resin layer 4 serving as a servo pattern composed of lands and groups is formed on the protective film 3.
- a silane coupling agent is applied to the protective film 3 in order to improve the adhesion between the protective film 3 and the resin layer 4.
- the substrate-side member is pressed against the stamper 41 from above with a predetermined pressure such that the servo pattern surface of the stamper 41 and the protective film 3 face each other.
- the resin is applied to the stamper 41 and the protective film 3 After the resin is uniformly filled, the resin is heated (for example, at 140 ° C. for 30 minutes) from the stamper 41 side to cure the resin.
- thermosetting resin 42 When the thermosetting resin 42 is peeled off from the stamper 41 after the resin has hardened, a medium having a resin layer 4 having a servo pattern shape is formed as shown in FIG. 5 (f).
- the protective film 3 is treated with a silane coupling agent, the adhesion between the protective film 3 and the resin layer 4 is high, and the resin layer 4 is peeled off from the stamper 41.
- the resin layer 4 is formed to a thickness of about 10 / m or less.o
- a reflective film 5 (A1 film, film thickness 15 nm), a base dielectric film 6 (SiN, film thickness 60 nm), The recording film 7 (total thickness of about 130 nm) and the upper dielectric film 8 (SiN, thickness of 80 nm) are formed in this order.
- Ar was used as a film-forming gas
- the gas pressure was 0.5 to lPa
- the input power was 0.5 to 0.8 kw
- the film was formed by a sputtering method.
- the recording film 7 is a double-mask RAD-type magnetic super-resolution film having a three-layer structure (see, for example, JP-A-2000-200448).
- the principle of reproduction of such a magnetic super-resolution medium is that a magnetic mask is formed on the low-temperature side and high-temperature side of the laser spot irradiation area, and minute recording marks are formed from the intermediate temperature area sandwiched between them.
- in t present embodiment is a method of reproducing, on the underlying dielectric layer 6, the recording layer 7 1 (Tb 22. 2 F e 60.3 Co l 7.5 alloy film, thickness 50 nm), the intermediate layer 72 ((G d 33. 8 F e 62. 4 C o 3. 8) g 2 S i 8 alloy film, thickness 40 nm) Then, a reproducing layer 73 (Gd 24.6 Fe 61.8 Co 13.6 alloy film, film thickness 40 nm) was formed by the sputtering method in this order.
- a cover layer 9 (ultraviolet curable resin, film thickness of about 10 m ⁇ 2 / m) was formed by applying an ultraviolet curable resin.
- the magneto-optical recording medium of the first embodiment of the present invention shown in FIG. 1 is manufactured.
- the distance A from the surface of the soft magnetic film 2 to the proximity function 21 can be set to about 70 ⁇ 4 zm, and the distance B to the flying head 22 can be set to about 22 ⁇ 4 m. It is possible to form a magneto-optical medium having a stable magnetic characteristic without sufficiently oxidizing and nitriding the soft magnetic film 2 by sufficiently exerting the function of concentrating the magnetic flux of the magnetic film 2.
- the medium of the first embodiment of the present invention can obtain a sufficient CNR for recording and reproduction even when a lower level magnetic field is applied.
- Comparative Example A is different from the first embodiment in FIG. 1 in that the soft magnetic film 2 and the protective film 3 are not provided, and other film configurations are the same. You. Comparative Example B has the same film configuration as the first embodiment of FIG. 1, except that the soft magnetic film 2 has a thickness of 5 O nm.
- Figure 6 shows a graph of CNR versus recording magnetic field strength for the three media.
- the horizontal axis is the recording magnetic field strength (Oe), and the vertical axis is the signal-to-noise ratio CNR (dB).
- the solid line graph is the medium of the first embodiment of the present invention.
- the CNR reaches a constant value and is saturated.
- the dotted-line graph shows the medium of Comparative Example A (without the soft magnetic film and the protective film), and the CNR is saturated when the recording magnetic field intensity is about 3400 e.
- the dashed-dotted line shows the medium of Comparative Example B (the thickness of the soft magnetic film 2 is 50 nm), which is saturated at about 2500 e.
- the CNR increases as the recording magnetic field intensity increases, but for any medium, when the recording magnetic field intensity reaches a certain value, it is saturated up to CNEJ.
- each of the values of the saturated CNR is about 45 dB, but it is advantageous in that the lower the recording magnetic field strength at which the CNR becomes saturated, the higher the writing speed (that is, the recording speed) of the medium can be improved.
- the medium of the first embodiment of the present invention achieves a saturated CNR at about 2000 e, whereas Comparative Examples A and B achieve the same saturated CNR.
- CNR 45 dB
- the same recording characteristics (CNR) can be achieved only by applying a recording magnetic field strength of about 2000 e, and a high recording speed of 100 Mbps can be achieved by applying a recording magnetic field strength as low as 2000 e. it can.
- the medium of the first embodiment of the present invention is on the substrate, the soft magnetic film 2 is provided under the recording film 7, and the soft magnetic film 2 is prevented from being changed due to oxidation or the like. Therefore, it is considered that the provision of the protective film 3 allows the magnetic flux from the coil to be concentrated immediately below the coil and to be applied stably.
- FIG. 7 shows a schematic sectional view of the configuration of the magneto-optical recording medium according to the second embodiment of the present invention.
- the medium of the second embodiment is composed of a glass substrate 1, a soft magnetic film 2, a protective film 3, an anaerobic cured resin 54, a glass substrate 21, a resin layer 53, a reflective film 5, an underlayer. It has a laminated structure in which the dielectric film 6, the recording film 7, the protective film 8 and the cover layer 9 are formed in this order.
- a medium is manufactured by being divided into two parts up to a certain point, and the two members are combined.
- a glass substrate 21 is used for producing a member for forming the resin layer 53.
- the anaerobic cured resin 54 is for bonding a second member composed of the substrate 1, the soft magnetic film 2, and the protective film 3 to a first member composed of the glass substrate 21 and the resin layer 53. .
- the glass substrate 21 may be a substrate having high rigidity, and a silicon wafer may be used in addition to glass.
- a silicon wafer may be used as the anaerobic hardening resin 54.
- the above-mentioned materials (primer: TB1390E, resin: TB3062B) can be used.
- the same material as that of the first embodiment can be used for the soft magnetic film 2 and the like.
- the medium of the second embodiment of the present invention is produced by a manufacturing method different from that of the first embodiment.
- FIGS. 8, 9, and 10 show manufacturing process diagrams of the second embodiment.
- a glass substrate 21 having a thickness of 100 ⁇ m, a diameter of 90 mm, and a surface roughness of 2.5 A is prepared.
- the surface of the glass substrate 21 to be bonded to the resin layer 53 is treated with a silane coupling agent in order to ensure adhesion.
- the surface of the substrate 21 that has been treated with the silane coupling agent is placed on the ultraviolet curable resin 53 and pressed so that the resin layer 53 spreads evenly in the groove. Then, as shown in FIG. 8 (c), ultraviolet rays 59 are irradiated from behind the glass substrate 21 (for 2 minutes) to cure the resin layer 53. Through the above steps, the second member is completed.
- the same glass substrate 1 as in the first embodiment is prepared.
- a soft magnetic film 2 (F 6 C, film thickness 100 nm) is formed on the glass substrate 1 by a sputtering method.
- the protective film 3 (S i0 2, thickness 1 O nm) forming a film by sputtering.
- the surface of the protective film 3 is treated with a silane coupling agent in order to secure adhesion in the next step.
- the glass substrate 21 of the second member and the protective film 3 of the first member are bonded via the anaerobic cured resin 54.
- the anaerobic magnetized resin 54 a material obtained by mixing the above-described primer and resin is used, and an amount of about 10 m in thickness after the resin 54 is cured may be dropped on the surface of the glass substrate 21.
- the anaerobic cured resin 54 was cured. Thereafter, the stamper 51 is peeled from the resin layer 53. As described above, the coupling medium having the servo pattern formed on the surface is formed.
- a reflective film 5 On the resin layer 53 on which the servo pattern is formed as shown in FIG. 10 (h), a reflective film 5, a base dielectric film 6, and a three-layer recording film are formed in the same manner as in the first embodiment. 7 and the upper dielectric film 8 are formed in this order (FIG. 10 (i)). Film forming conditions such as film thickness and material may be the same as those in the first embodiment.
- an ultraviolet curing resin is applied to form a cover layer 9 (ultraviolet curing resin, film thickness of about 10 / m, about ⁇ 2 zm).
- a cover layer 9 ultraviolet curing resin, film thickness of about 10 / m, about ⁇ 2 zm.
- FIG. 11 is an explanatory view of the positional relationship between the proximity factor and the flying head in the second embodiment of the present invention.
- the distance C from the surface of the cover layer 9 to the proximity actuator 21 is 50 m
- the distance D from the surface of the cover layer 9 to the flying head 22 is about lzm
- the distance A from the surface of the magnetic film 2 to the proximity function 21 can be about 175 to 185 / m
- the distance B to the flying head 22 can be about 126 to 136 m.
- the soft magnetic film 2 and the protective film 3 are formed on the substrate 1, stable magnetic flux concentration can be achieved, and a low magnetic flux of about 20 OO e can be achieved. Even if a recording magnetic field intensity is applied, a CNR sufficient for recording and reproduction can be obtained, and high-speed recording of about 10 OMbps can be realized.
- the glass member 21 formed on the second member is used.
- the second member without the glass substrate 21 and the first member may be combined.
- the ultraviolet curing resin 53 of the second member and the protective film 3 of the first member are bonded via the anaerobic curing resin 54.
- the distance between the soft magnetic film 2 and the recording film 7 can be reduced by a thickness corresponding to the thickness (about 1.2 mm). Stable magnetic flux concentration and sufficient CNR can be obtained, and high-speed recording of about 100 Mbps can be realized by applying a low recording magnetic field strength of about 2000 e.
- FIGS. 12, 13, and 14 show a manufacturing process diagram of the magneto-optical recording medium according to the third embodiment of the present invention.
- 0.9 g of the ultraviolet curable resin 53 is dropped on the same nickel stamper 51 as in the second embodiment. Then, the stamper 51 is rotated at a speed of about 2000 rpm, and the ultraviolet curable resin 53 is spin-coated so as to cover all the irregularities on the surface of the stamper.
- the resin 53 is irradiated with ultraviolet rays 59 to be cured.
- a resin film 53 having a thickness of about 10 ⁇ m is formed.
- the second member is completed.
- the first member is completed by the steps (film formation of the soft magnetic film 2 and the protective film 3) shown in FIGS. 12 (c), (d) and (e), which are the same as the second member of the second embodiment. Made by the same method.
- a predetermined amount of the anaerobic cured resin 54 is dropped onto the cured resin layer 53, and the resin layer 53 of the second member and the protective film of the first member are formed. 3 and glue.
- the reflective film 5 On the resin layer 53 of the coupling medium as shown in FIG. 14 (g), the reflective film 5, the underlying dielectric film 6, the recording film 7 and the upper layer were formed in the same manner as in the first and second embodiments.
- a dielectric film 8 and a cover layer 9 are formed (FIGS. 14 (h) and (i)).
- the magneto-optical recording medium according to the third embodiment of the present invention is completed.
- the three configurations and the method of manufacturing the magneto-optical recording medium of the present invention have been described.
- the configurations from the base dielectric film 6 to the cover layer 9 are not particularly limited, and are conventionally used. The same one as the magneto-optical recording medium may be applied.
- the recording film 7 may be a single-layer recording magnetic film instead of a three-layer magnetic super-resolution film.
- the protective film is formed in contact with the soft magnetic film, oxidation and nitridation of the soft magnetic film can be prevented, and a magneto-optical recording medium having stable magnetic characteristics can be provided.
- a soft magnetic film is disposed in contact with the substrate, a protective film and a resin layer having a servo pattern are formed thereon, and a recording layer is further formed thereon.
- Magnetic flux emitted from a coil such as a magnetic field can be concentrated and applied directly underneath, providing a medium with sufficient recording and reproducing characteristics and stable magnetic characteristics even when a smaller magnetic field is applied than before. be able to.
- the current flowing through the coil can be reduced, and the recording speed can be increased to about 10 O Mbps.
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003556989A JP3645252B2 (ja) | 2001-12-25 | 2001-12-25 | 光磁気記録媒体 |
PCT/JP2001/011417 WO2003056555A1 (fr) | 2001-12-25 | 2001-12-25 | Support d'enregistrement magneto- optique |
EP01275106A EP1460627A4 (en) | 2001-12-25 | 2001-12-25 | MAGNETO-OPTICAL RECORDING MEDIUM |
CNB018239102A CN1291407C (zh) | 2001-12-25 | 2001-12-25 | 磁光记录介质 |
TW090132383A TW559793B (en) | 2001-12-25 | 2001-12-26 | Magneto-optical recording medium |
US10/863,875 US7090933B2 (en) | 2001-12-25 | 2004-06-08 | Magneto-optical recording medium including a soft magnetic layer, a protective layer and a silane coupling agent layer, in this order |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2001/011417 WO2003056555A1 (fr) | 2001-12-25 | 2001-12-25 | Support d'enregistrement magneto- optique |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/863,875 Continuation US7090933B2 (en) | 2001-12-25 | 2004-06-08 | Magneto-optical recording medium including a soft magnetic layer, a protective layer and a silane coupling agent layer, in this order |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003056555A1 true WO2003056555A1 (fr) | 2003-07-10 |
Family
ID=11738073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/011417 WO2003056555A1 (fr) | 2001-12-25 | 2001-12-25 | Support d'enregistrement magneto- optique |
Country Status (6)
Country | Link |
---|---|
US (1) | US7090933B2 (ja) |
EP (1) | EP1460627A4 (ja) |
JP (1) | JP3645252B2 (ja) |
CN (1) | CN1291407C (ja) |
TW (1) | TW559793B (ja) |
WO (1) | WO2003056555A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7352529B2 (en) * | 2004-02-26 | 2008-04-01 | Tdk Corporation | Magnetic recording medium and magnetic recording and reproducing device using a magnetic recording layer formed with a predetermined concavo-convex pattern |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7019924B2 (en) * | 2001-02-16 | 2006-03-28 | Komag, Incorporated | Patterned medium and recording head |
JP2004103130A (ja) * | 2002-09-10 | 2004-04-02 | Fujitsu Ltd | 光磁気記録媒体 |
US7147790B2 (en) * | 2002-11-27 | 2006-12-12 | Komag, Inc. | Perpendicular magnetic discrete track recording disk |
US20050036223A1 (en) | 2002-11-27 | 2005-02-17 | Wachenschwanz David E. | Magnetic discrete track recording disk |
FR2860636B1 (fr) * | 2003-10-03 | 2006-12-29 | Commissariat Energie Atomique | Support de stockage d'informations et procede de fabrication d'un tel support |
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CA2027870C (en) * | 1989-10-21 | 2000-09-12 | Tetsu Watanabe | Magnetooptical recording medium and method for manufacturing the same |
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JP2000200448A (ja) | 1998-10-30 | 2000-07-18 | Fujitsu Ltd | 光磁気記録媒体及び光磁気記録媒体の製造方法 |
-
2001
- 2001-12-25 WO PCT/JP2001/011417 patent/WO2003056555A1/ja active Application Filing
- 2001-12-25 CN CNB018239102A patent/CN1291407C/zh not_active Expired - Fee Related
- 2001-12-25 EP EP01275106A patent/EP1460627A4/en not_active Withdrawn
- 2001-12-25 JP JP2003556989A patent/JP3645252B2/ja not_active Expired - Fee Related
- 2001-12-26 TW TW090132383A patent/TW559793B/zh not_active IP Right Cessation
-
2004
- 2004-06-08 US US10/863,875 patent/US7090933B2/en not_active Expired - Fee Related
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JPS6171437A (ja) * | 1984-09-14 | 1986-04-12 | Fujitsu Ltd | 光磁気デイスク |
JPS61113153A (ja) * | 1984-11-06 | 1986-05-31 | Nippon Telegr & Teleph Corp <Ntt> | 磁気記録光再生方法及びそのための記録媒体 |
JPS63244345A (ja) * | 1987-03-30 | 1988-10-11 | Matsushita Electric Ind Co Ltd | 光磁気記録媒体 |
JPH03105741A (ja) * | 1989-09-20 | 1991-05-02 | Fujitsu Ltd | 光磁気記録媒体用基板 |
JPH03137837A (ja) * | 1989-10-21 | 1991-06-12 | Sony Corp | 光磁気記録媒体 |
JPH03141055A (ja) * | 1989-10-26 | 1991-06-17 | Sony Corp | 光磁気記録媒体の製造方法 |
JPH05307780A (ja) * | 1992-04-27 | 1993-11-19 | Sony Corp | 光磁気記録媒体 |
JP2000076720A (ja) * | 1998-09-03 | 2000-03-14 | Sanyo Electric Co Ltd | 光磁気記録媒体 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7352529B2 (en) * | 2004-02-26 | 2008-04-01 | Tdk Corporation | Magnetic recording medium and magnetic recording and reproducing device using a magnetic recording layer formed with a predetermined concavo-convex pattern |
Also Published As
Publication number | Publication date |
---|---|
CN1582474A (zh) | 2005-02-16 |
CN1291407C (zh) | 2006-12-20 |
TW559793B (en) | 2003-11-01 |
EP1460627A4 (en) | 2006-07-26 |
JP3645252B2 (ja) | 2005-05-11 |
US20040224119A1 (en) | 2004-11-11 |
JPWO2003056555A1 (ja) | 2005-05-12 |
EP1460627A1 (en) | 2004-09-22 |
US7090933B2 (en) | 2006-08-15 |
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