WO2005013264A1 - 磁気記録媒体の製造方法及び製造装置 - Google Patents
磁気記録媒体の製造方法及び製造装置 Download PDFInfo
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- WO2005013264A1 WO2005013264A1 PCT/JP2004/010710 JP2004010710W WO2005013264A1 WO 2005013264 A1 WO2005013264 A1 WO 2005013264A1 JP 2004010710 W JP2004010710 W JP 2004010710W WO 2005013264 A1 WO2005013264 A1 WO 2005013264A1
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- layer
- mask layer
- continuous recording
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- magnetic recording
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/855—Coating only part of a support with a magnetic layer
Definitions
- the present invention relates to a method and an apparatus for manufacturing a magnetic recording medium.
- magnetic recording media such as hard disks have been significantly improved in areal recording density by making finer magnetic particles constituting a recording layer, changing materials, and making finer head processing. Further improvement in areal recording density is expected.
- Processing techniques for achieving fine division of the continuous recording layer include, for example, ion beam etching, NH (ammonia) gas, and the like as disclosed in JP-A-12-322710.
- C ⁇ nitrogen gas was added can utilize the technique of dry etching such as reactive Ion'etsuchin grayed to react the gases.
- the continuous recording layer can be divided into a large number of divided recording elements in a fine pattern, while the magnetic recording medium
- the processing accuracy of the divided recording element may vary or the divided recording element may be magnetically deteriorated due to excessive heating.
- steps such as burrs are formed along the periphery of the divided recording element, or a divided recording element having a tapered side surface is formed. Some deviation may occur. Due to such magnetic deterioration and deviation of the processed shape of the divided recording element, a desired The magnetic properties cannot be obtained.
- Reactive ion etching using C ⁇ (carbon monoxide) gas or the like used for processing magnetic materials requires a large bias power, and the workpiece tends to be heated to a high temperature.
- the recording element may be overheated and magnetically degraded.
- the cooling mechanism is generally ESC (electrostatic chuck) or bias application.
- ESC electrostatic chuck
- bias application When a plurality of workpieces are arranged side by side, it is difficult to provide such a cooling mechanism due to circumstances such as S-space and machining accuracy, and it is necessary to cool the workpieces. It has been difficult to mass-produce discrete magnetic recording media by simultaneously processing a plurality of workpieces using reactive ion etching.
- FIG. 22A when the exposed portion of the mask 102 in the continuous recording layer 100 is processed by ion beam etching, the removal of the continuous recording layer 100 and the removal of the removed particles The reattachment to the side surface 102A etc. of the part of the mask 102 is repeated, and if the amount of reattachment is small, it is likely that the reattachment will be sequentially removed by the ion beam. As a result, as shown in FIG. 22C, a step 106 is formed at the peripheral edge of the divided recording element 104. This phenomenon is remarkable in forces that can occur in dry etching in general, especially in ion beam etching.
- the present invention has been made in view of the above problems, and suppresses a shift in the processing shape of a divided recording element, magnetic deterioration, and an efficiency of a magnetic recording medium having good magnetic characteristics.
- An object of the present invention is to provide a method and apparatus for manufacturing a magnetic recording medium that can be manufactured well.
- the present invention uses ion beam etching as a dry etching method for a continuous recording layer, thereby suppressing a reduction in processing accuracy of the continuous recording layer near the end of the object to be cured and processing the continuous recording layer. This is to suppress the temperature and prevent or reduce the magnetic deterioration of the divided recording elements.
- the present invention reduces the thickness of the coating element on the continuous recording layer by removing the resist layer on the mask layer covering the continuous recording layer prior to the drying of the continuous recording layer.
- the formation of the step and the taper angle of the side face of the divided recording element are suppressed, and the processing accuracy of the divided recording element is improved.
- the material of the mask layer covering the continuous recording layer is that the etching rate is low compared to ion beam etching, and that it can be formed thinner, and that the shape of the mask is relatively easy to control. It is preferable to use diamond-like carbon.
- DLC diamond-like carbon
- ion beam etching is used as a general term for a processing method of irradiating an ionized gas onto a substrate to be removed, such as ion milling.
- the method is not limited to the processing method in which the ion beam is focused and irradiated.
- magnetic recording medium is not limited to a hard disk, a floppy (registered trademark) disk, a magnetic tape, or the like that uses only magnetism for recording and reading information. (Magneto Optical) and other heat-assisted recording media that use both magnetism and heat.
- a method for manufacturing a magnetic recording medium (1) forming a continuous recording layer, a mask layer, and a resist layer on a substrate surface in this order, and processing the resist layer of the object to be processed into a predetermined pattern shape; A mask layer processing step of processing the mask layer into the pattern shape based on the above, a resist layer removing step of removing the resist layer on the mask layer, and dry etching the continuous recording layer based on the mask layer. A continuous recording layer processing step of processing into a pattern shape and dividing into a plurality of divided recording elements, wherein the resist layer removing step is executed before the continuous recording layer processing step.
- a method for manufacturing a magnetic recording medium (1) forming a continuous recording layer, a mask layer, and a resist layer on a substrate surface in this order, and processing the resist layer of the object to be processed into a predetermined pattern shape; A mask layer processing step of processing the mask layer into the pattern shape based on the above, a resist layer removing step of removing the resist layer on the mask layer, and dry etch
- the mask layer includes a layer having an etching rate lower than that of the continuous recording layer in the continuous recording layer processing step, and the layer is formed thinner than the continuous recording layer.
- the etching rate of the mask layer in the continuous recording layer processing step is lower than that of the continuous recording layer, and the thickness t of the layer is 3 ⁇ t ⁇ 15 nm.
- the etching rate of the mask layer in the continuous recording layer processing step is lower than that of the continuous recording layer, and the thickness t of the layer is 3 ⁇ t ⁇ 10 nm.
- the continuous recording layer processing step the continuous recording layer is processed using ion beam etching. Manufacturing method of recording medium.
- the mask layer has a first mask layer whose etching rate in the continuous recording layer processing step is lower than that of the continuous recording layer, and an etching rate in the resist layer removing step which is equal to the first mask layer.
- a second mask layer disposed between the first mask layer and the resist layer, and wherein the mask layer processing step is performed based on the resist layer.
- (6) the method for manufacturing a magnetic recording medium according to any one of (1) to (6).
- the resist layer removing step the resist layer is removed using reactive ion etching using either oxygen or ozone as a reactive gas, and the mask layer is removed.
- the second mask layer has a sufficiently small thickness so that the second mask layer on the first mask layer is removed in the continuous recording layer processing step. And / or wherein the material is a material having an etching rate higher than that of the material of the continuous recording layer in the continuous recording layer processing step. Manufacturing method.
- the second mask layer processing step is characterized in that the second mask layer is removed by reactive ion etching using a fluorine-based gas as a reactive gas.
- (13) The magnetic recording medium of any one of (1) to (12), wherein, in the resist layer processing step, the resist layer is formed by using an imprint method. Manufacturing method.
- a method for manufacturing a magnetic recording medium comprising:
- the present invention it is possible to suppress the deviation of the processed shape of the divided recording element and the magnetic deterioration of the divided recording element, and to efficiently and reliably manufacture a magnetic recording medium having good magnetic characteristics. When it comes to, it has an excellent effect S.
- FIG. 1 is a cross-sectional side view schematically showing a structure of an object to be processed, which is a processing starter of a magnetic recording medium according to an embodiment of the present invention.
- FIG. 2 is a side cross-sectional view schematically showing the structure of a magnetic recording medium obtained by caulking the subject body.
- FIG. 3 is a block diagram schematically showing a structure of a manufacturing apparatus for manufacturing the magnetic recording medium.
- Garden 4 A perspective view schematically showing the structure of a holder provided in the manufacturing apparatus.
- FIG. 5 is a side view schematically showing a structure of a reactive ion etching apparatus provided in the manufacturing apparatus.
- FIG. 6 is a side view schematically showing a structure of an ion beam etching apparatus provided in the manufacturing apparatus.
- FIG. 7 is a flowchart showing a manufacturing process of a magnetic recording medium.
- FIG. 15 is a cross-sectional side view schematically showing the shape of the workpiece in which the surfaces of the divided recording elements and the nonmagnetic material are flattened.
- FIG. 16 is a micrograph showing an enlarged shape of a divided recording element of a magnetic recording disk according to an example of the present invention.
- FIG. 21 A micrograph showing an enlarged shape of a divided recording element of a magnetic recording disk of Comparative Example 3.
- FIG. 22A is a cross-sectional side view schematically showing a state in which the continuous recording layer is partially covered with a mask for processing the continuous recording layer by conventional dry etching.
- FIG. 22B is a cross-sectional side view schematically showing a process of depositing particles on the side surface of the mask.
- FIG. 22C is a cross-sectional side view schematically showing the formed recording element and a step at the periphery thereof.
- FIG. 23A A cross-sectional side view schematically showing an ideal forming process of a divided recording element by conventional dry etching.
- FIG. 23B A cross-sectional side view schematically illustrating an actual formation process of a divided recording element by conventional dry etching.
- the present invention relates to a method for manufacturing a magnetic recording medium in which a continuous recording layer is processed into a shape of a servo pattern (not shown) including contact holes and divided into a number of divided recording elements. It is characterized by the material of the mask layer covering the recording layer, the material of the resist layer and the processing method thereof.
- the present embodiment has a feature in a magnetic recording medium manufacturing apparatus for performing the method of processing the continuous recording layer and mass-producing the magnetic recording medium.
- the other configuration is the same as that of the conventional method and apparatus for manufacturing a magnetic recording medium, and thus the description will be omitted as appropriate.
- the toughened body 10 has a substantially disk shape (not shown) having a center hole, and as shown in FIG. 1, a glass substrate 12, an underlayer 14, a soft magnetic layer 16, and an alignment layer. 18, a continuous recording layer 20, a first mask layer 22, a second mask layer 24, and a resist layer 26 are formed in this order.
- the material of the underlayer 14 is Cr (chromium) or a Cr alloy
- the material of the soft magnetic layer 16 is an Fe (iron) alloy or a Co (cobalt) alloy
- the material of the orientation layer 18 is CoO, MgO, NiO, etc. 20 continuous recording layers
- the material is a Co (cobalt) alloy.
- the material of the first mask layer 22 is DLC
- the material of the second mask layer 24 is Si (silicon)
- the material of the resist layer 26 is a negative resist HNEB22A (Sumitomo Chemical Industries, Ltd.).
- the magnetic recording medium 30 is a perpendicular recording type discrete magnetic disk, and the continuous recording layer 20 is divided into a large number of divided recording elements 31 at minute intervals in the track radial direction.
- the non-magnetic material 32 is filled in the grooves 33 between the divided recording elements 31, and the protective layer 34 and the lubricating layer 36 are formed in this order on the divided recording elements 31 and the non-magnetic material 32. ing. Note that a diaphragm 38 is formed between the divided recording element 31 and the non-magnetic material 32.
- the material of the nonmagnetic material 32 is Si ⁇ (silicon dioxide), and the material of the protective layer 34 and the diaphragm 38 are not
- the material for the hard carbon film called DLC and the lubricating layer 36 is PFPE (perfluoropolyether).
- the magnetic recording medium manufacturing apparatus 40 includes a transfer apparatus 42, an asshing apparatus 44, reactive ion etching apparatuses 46 and 48, an ion beam etching apparatus 50, and an asshing apparatus. 52, a dry cleaning device 54, a diaphragm forming device 56, a non-magnetic material filling device 58, a flattening device 60, a protective layer forming device 62, and a lubricating layer forming device 64 for forming the lubricating layer 36.
- a transfer apparatus 42 an asshing apparatus 44, reactive ion etching apparatuses 46 and 48, an ion beam etching apparatus 50, and an asshing apparatus. 52, a dry cleaning device 54, a diaphragm forming device 56, a non-magnetic material filling device 58, a flattening device 60, a protective layer forming device 62, and a lubricating layer forming device 64 for forming the lubricating layer 36.
- the manufacturing device 40 includes an asshing device 44, reactive ion etching devices 46 and 48, an ion beam etching device 50, an asshing device 52, a dry cleaning device 54, a diaphragm forming device 56, a non-magnetic material filling device. 58, a vacuum holding device 66 for holding the flattening device 60 and the protective layer forming device 62 and holding the periphery of the body 10 under vacuum in a vacuum state.
- the manufacturing apparatus 40 includes a holder 68 as shown in FIG. 4 for simultaneously holding the plurality of force-pulled bodies 10, an automatic transfer device (not shown) for automatically transferring the holder 68, It is possible to simultaneously process a plurality of force receiving bodies 10.
- the transfer device 42 uses a nano-imprint method for pressing a mold (not shown) formed by lithography or the like onto the resist layer 26 to transfer a predetermined pattern to the resist layer 26 and form a groove. It is a press device used.
- the asshing apparatus 44 is an asshing apparatus using plasma of oxygen, ozone, or a gas of those gases. Thus, the resist layer 26 on the bottom of the groove remaining during the nano 'imprint is removed.
- the reactive ion etching apparatus 46 includes a CF (carbon tetrafluoride) gas or a SF (sulfur hexafluoride) gas.
- the second mask layer 24 on the bottom surface of the groove is removed by reactive ion etching using a fluorine-based gas such as a gas as a reactive gas.
- the reactive ion etching apparatus 46 is of a helicopter wave type, and includes a diffusion chamber 46A and a holder 68 placed in the diffusion chamber 46A.
- ESC electrostatic chuck
- stage electrode 46B and a quartz bell jar 46C for generating plasma.
- a bias power supply 46D for applying a bias voltage is connected to the ESC stage electrode 46B.
- the bias power supply is an AC power supply having a frequency of 1.6 MHz.
- the bell-jar 46C made of quartz has a lower end opening inside the diffusion chamber 46A, and an air supply hole 46E for supplying a reaction gas is provided near the lower part.
- An electromagnetic coil 46F and an antenna 46G are provided around the quartz bell jar 46C, and a plasma generation power supply 46H is connected to the antenna 46G.
- the plasma generation power supply 46H is an AC power supply having a frequency of 13.56 MHz.
- the reactive ion etching device 48 removes the resist layer 26 in the region other than the groove by reactive ion etching using oxygen or ozone as a reactive gas, and also removes the first mask layer on the bottom surface of the groove. It is configured to The structure of the reactive ion etching device 48 is the same as that of the reactive ion etching device 46 except for the type of the reaction gas.
- the ion beam etching apparatus 50 is configured to remove the continuous recording layer 20 on the groove bottom by ion beam etching using Ar (argon) gas and divide the continuous recording layer 20 into a number of divided recording elements 31.
- Ar argon
- the ion beam etching apparatus 50 includes a vacuum chamber 50A and an ESC (electrostatic chuck) stage electrode for mounting the holder 68 in the vacuum chamber 50A.
- 50B an ion gun 50C for generating ions and irradiating the stage electrode 50B, and a gas supply unit 50D for supplying an argon gas to the ion gun 50C;
- a power supply 50E for applying a beam voltage to the gun 50C.
- the vacuum chamber 50A is provided with a discharge hole 50F for discharging argon gas.
- the ion gun 50C includes an anode 50G and a cathode 50H connected to a power supply 50E.
- the cathode 50H is provided with a large number of fine holes 50J, and is configured to emit and irradiate ionized argon gas from the fine holes 50J.
- the asshing device 52 is configured to remove the first mask layer 22 remaining on the divided recording elements 31 by asking using oxygen, ozone, or a plasma of these gases.
- the dry cleaning device 54 is configured to remove foreign matters around the divided recording elements 31 using plasma.
- the diaphragm forming apparatus 56 is a CVD apparatus for forming the DLC diaphragm 38 on the divided recording elements 31 by CVD (Chemical Vapor or Deposition).
- the non-magnetic material filling device 58 divides the non-magnetic material 32 of Si ⁇ by non-sputtering.
- the flattening device 60 is an ion beam etching device for flattening the medium surface by ion beam etching using Ar gas.
- the protective layer forming device 62 is a CVD device for forming the DLC protective layer 34 on the divided recording element 31 and the nonmagnetic material 32 by a CVD method.
- the lubricating layer forming device 64 is a diving device for applying the PFPE lubricating layer 36 to the protective layer 34 by diving.
- the vacuum holding device 66 includes a vacuum chamber 70 and a vacuum pump 72 communicating with the vacuum chamber 70.
- the holder 68 is substantially disc-shaped and has conductivity, and is formed with a plurality of circular concave portions 68A in which the workpiece 10 is loosely fitted and held.
- a circular step 68B is formed in the vicinity of the center of each circular recess 68A, so that the force-cured body 10 having a center hole is loosely fitted on the inner periphery and the outer periphery.
- a force-resistant body 10 is prepared.
- the substrate 10 is a glass substrate 12, the underlayer 14 is 30 to 2000 nm thick, the soft magnetic layer 16 is 50 to 300 nm thick, and the layer 18 is 3 to 30 nm thick.
- the continuous recording layer 20 is formed to have a thickness of 530 nm
- the first mask layer 22 is formed to have a thickness of 320 nm
- the second mask layer 24 is formed to have a thickness of 3 to 15 nm.
- the resist layer 26 is obtained by forming the resist layer 26 to a thickness of 30 to 300 nm by spin coating or diving.
- the first mask layer 22 is preferably formed thinner than the continuous recording layer 20.
- the first mask layer 22 is preferably formed with a thickness of 15 nm or less.
- the transfer device 42 is used to transfer grooves corresponding to the divided patterns of the divided recording elements 31 as shown in FIG. 8 to the resist layer 26 of the body 10 by imprinting.
- the force S for efficiently transferring the groove corresponding to the divided pattern to the force-cured body 10 can be obtained. Note that it is naturally possible to transfer grooves corresponding to the divided pattern to the force-receiving body 10 by lithography or the like.
- the plurality of workpieces 10 having the grooves thus formed are mounted on the holder 68 and carried into the vacuum chamber 70.
- the loaded holder 68 is automatically transported to each processing device in the vacuum chamber 70 by a transport device (not shown), and a plurality of workpieces 10 are simultaneously processed.
- the asshing device 44 removes the resist layer 26 on the bottom of the groove as shown in FIG.
- the reactive ion etching apparatus 46 removes the second mask layer 24 on the bottom of the groove (S104). At this time, the first mask layer 22 is also removed in a very small amount. Also, the resist layer 26 in the region other than the groove is slightly removed but remains.
- a fluorine-based gas is used as a reactive gas
- a wet cleaning using water or the like is necessarily required as in the case of using a chlorine-based gas as a reactive gas. Instead, dry cleaning is sufficient as described later. Therefore, it is possible to make all the processing steps of the toughened body 10 a dry step, which contributes to an improvement in production efficiency.
- the reactive ion etching device 48 removes the first mask layer 22 on the bottom of the groove.
- the resist layer 26 in a region other than the groove is removed (S106).
- the second mask layer 24 in a region other than the groove is also slightly removed, but most remains.
- the first mask layer 22 is made of DLC
- the resist layer 26 is made of resin.
- the etching rate is high for reactive ion etching using oxygen as a reactive gas. The removal of the first mask layer 22 and the removal of the resist layer 26 in a region other than the groove can be performed at the same time, and the production efficiency is high.
- the second mask layer 24 made of silicon and having a low etching rate with respect to reactive ion etching using oxygen as a reaction gas is formed on the first mask layer 22, the second mask layer 24 is formed on a portion other than the groove. The region of the first mask layer 22 remains in a good shape.
- the selection range of the mask material and the type of the reaction gas can be expanded.
- the ion beam etching apparatus 50 removes the continuous recording layer 20 on the bottom of the groove, whereby the continuous recording layer 20 is divided into a number of divided recording elements 31 and divided.
- a groove 33 is formed between the recording elements 31 (S108).
- the second mask layer 24 in the region other than the groove is completely removed, and most of the first mask layer 22 in the region other than the groove is also removed. It may remain on the upper surface.
- the etching rate for the ion beam etching is lower than that of the continuous recording layer 20, and the first mask layer 22 needs to be thinner. Further, since the second mask layer 24 is made of silicon and has a higher etching rate for ion beam etching than the continuous recording layer 20, it is removed in a short time. If the second mask layer 24 is formed as thin as possible in the resist layer removing step and the first mask layer processing step (S106), the etching rate for ion beam etching is equivalent to that of the continuous recording layer 20. Alternatively, even when a material lower than the continuous recording layer 20 is used, the second mask layer can be removed in a short time.
- the resist layer 26 on the second mask layer 24 has already been removed. That is, since the coating element that coats the continuous recording layer 20 is substantially thin, a portion that becomes a shadow of the ion beam irradiated from a direction inclined with respect to the normal to the surface of the force-cured body 10 is removed. It is possible to reduce the taper angle of the side of the smaller divided recording element 31 it can.
- the coating element covering the continuous recording layer 20 is thin, the amount of reattachment on the side surface of the coating element during ion beam etching is small, so that the edge shape at the periphery of the divided recording element 31 is small. Can be prevented or reduced. If the thickness of the first mask layer, the setting conditions of the ion beam etching, and the like are adjusted so that the remaining amount of the first mask layer on the divided recording element 31 is as small as possible, the side surface of the first mask layer can be adjusted accordingly. This can reduce the amount of re-attachment, and further suppress the occurrence of edge-shaped steps at the peripheral edge of the divided recording element 31.
- the entire area of the plurality of force-pulling bodies 10 whose processing accuracy depends on the shape of the body 10 to be processed is uniformly and precisely controlled with respect to the reactive ion etching. The ability to work
- the ion beam etching has a lower processing temperature than reactive ion etching using CO gas or the like as a reactive gas, and therefore can prevent or reduce magnetic deterioration of the divided recording element 31 due to excessive heating. .
- etching of a magnetic material progresses faster than in reactive ion etching using CO gas or the like as a reaction gas, and the production efficiency is low.
- the alignment layer 18 may be slightly removed.
- the asking device 52 completely removes the first mask layer 22 remaining on the divided recording elements 31 as shown in FIG. 13 (S110).
- the foreign matter on the surface of the divided recording element 31 is removed using the dry cleaning device 54 (S1).
- the diaphragm forming apparatus 56 forms a DLC diaphragm 38 with a thickness of 120 nm on the divided recording elements 31 (S114), and further fills the nonmagnetic material.
- the device 58 fills the groove 33 between the divided recording elements 31 with the non-magnetic material 32 (S116).
- the non-magnetic material 32 is formed so as to completely cover the diaphragm 38. Since the divided recording element 31 is covered and protected by the diaphragm 38, it is not deteriorated by the bias sputtering of the non-magnetic material 32.
- the flattening device 60 removes the non-magnetic material 32 up to the upper surface of the divided recording element 31 as shown in FIG. 15, and flattens the surfaces of the divided recording element 31 and the non-magnetic material 32. (S118) .
- the incident angle of Ar ions is in the range of 10 to 15 °.
- the incident angle of Ar ions should be in the range of 30 to 90 °. By doing so, the processing speed is increased, and the production efficiency can be increased.
- the “incident angle” is an incident angle with respect to the surface of the object to be processed, and is used in the meaning of an angle formed between the surface of the object to be processed and the central axis of the ion beam. For example, if the central axis of the ion beam is parallel to the surface of the object, the angle of incidence is 0 °.
- the diaphragm 38 on the divided recording element 31 may be completely removed or a part thereof may be left, but the nonmagnetic material 32 on the upper surface of the divided recording element 31 is completely removed.
- the protective layer forming device 62 forms the DLC protective layer 34 with a thickness of 115 nm on the upper surfaces of the divided recording elements 31 and the non-magnetic material 32 by the CVD method (S120).
- the honoreda 68 is carried out of the vacuum chamber 70, and each workpiece 10 is removed from the holder 68.
- a lubricating layer 36 of PFPE is applied on the protective layer 34 by divebing using the lubricating layer forming apparatus 64 (S122).
- the magnetic recording medium 30 shown in FIG. 2 is completed.
- the workpiece can be uniformly processed with high accuracy while suppressing magnetic deterioration.
- a cooling mechanism is necessary to limit magnetic deterioration, while when processing a plurality of workpieces simultaneously as described above, space and Although it is difficult to provide a cooling mechanism equipped with an ESC (electrostatic chuck) and a bias applying mechanism due to circumstances such as accuracy, etc., processing of the continuous recording layer 20 by using ion beam etching for processing the continuous recording layer 20 The temperature can be reduced, and the installation of a cooling mechanism is not required. As a result, it is possible to simultaneously process a plurality of force-sensitive bodies with high accuracy, and mass-produce a discrete-type magnetic recording medium efficiently.
- the divided recording element can be processed into a good shape.
- the film thickness can be reduced, and the processing accuracy of the divided recording element can be further improved.
- the formation of the divided recording elements 31 is performed in a state in which the periphery of the toughened body 10 is kept in a vacuum, the deterioration of the divided recording elements 31 such as oxidation and corrosion due to the curdling is prevented. be able to.
- the first mask layer 22 is removed after processing the continuous recording layer 20, but the present invention is not limited to this. It may be used as a part of the protective layer 34 without being removed.
- the force of using DLC as the material of the first mask layer 22 is not limited to this, as long as the material has a low etching rate for ion beam etching.
- the material of the first mask layer 22 may be another material.
- the force of forming two mask layers of the first mask layer 22 and the second mask layer 24 on the continuous recording layer 20 is not limited to this. If the etching conditions are appropriately set and a material having a low etching rate for ion beam etching and a low etching rate for the resist layer removing step is selected as the material of the first mask layer 22, the second mask layer 22 can be obtained. This mask layer may be omitted, and a single-layer mask layer may be used.
- the force of removing the resist layer 26 remaining in the region other than the groove by using the reactive ion etching is not limited to this.
- the present invention is not limited to this.
- the resist layer 26 may be removed using a technique, or the resist layer may be removed by dissolving the resist layer in a solution. In this case, if a material having a low etching rate with respect to the solution is selected as the material of the first mask layer 22, the second mask layer may be omitted and a single-layer mask layer may be used.
- the underlayer 14 and the soft magnetic layer 16 are formed below the continuous recording layer 20, but the present invention is not limited to this.
- the structure of the layer may be appropriately changed according to the type of the magnetic recording medium.
- one of the underlayer 14 and the soft magnetic layer 16 may be omitted.
- a continuous recording layer is formed directly on the substrate May be.
- the continuous recording layer 20 is processed by ion beam etching.
- the present invention is not limited to this.
- a process such as removing the resist layer on the mask layer is performed before the addition of the continuous recording layer, and the covering element on the continuous recording layer is substantially thinned. There is a certain effect of improving the processing accuracy of.
- the magnetic recording medium 30 is a perpendicular recording type magnetic disk in which the divided recording elements 31 are juxtaposed at fine intervals in the radial direction of the track.
- the magnetic recording disks are not limited, and the divided recording elements are juxtaposed at minute intervals in the circumferential direction of the track (sector direction), and are juxtaposed at minute intervals in both the radial direction and the circumferential direction of the track.
- the present invention is naturally applicable to the manufacture of a magnetic disk and a magnetic disk in which divided recording elements form a spiral shape.
- the present invention is also applicable to the manufacture of magneto-optical discs such as MOs, heat-assisted recording discs using both magnetism and heat, and discreet magnetic recording media other than discs such as magnetic tapes. It is possible.
- the magnetic recording medium manufacturing apparatus 40 is provided with an individual processing apparatus corresponding to each step.
- the present invention is not limited to this. It may be possible to carry out the processing of the step.
- the step of removing the resist layer 26 on the bottom of the groove and the step of removing the first mask layer 22 remaining on the divided recording elements 31 may be performed by a common asshing apparatus.
- the processing step of the continuous recording layer 20 and the flattening step of the divided recording layer 31 and the nonmagnetic material 32 may be performed by a common ion beam etching apparatus using Ar gas.
- the processing of the second mask layer 24, the processing of the first mask layer 22 and the removal of the resist layer 26 are performed by changing the reaction gas using a common reactive ion etching apparatus. I'm sorry. By doing so, the manufacturing apparatus can be made compact and low-cost.
- a magnetic recording disk was manufactured.
- the thickness of the continuous recording layer 20 is about 20 nm
- the thickness of the first mask layer 22 is about 10 nm
- the thickness of the second mask layer 24 is about 5 nm.
- the thickness of the dist layer 26 was about 100 nm.
- Second mask layer 24 50 ° C or less, about 5 seconds (reaction gas SF)
- First mask layer 22 50 ° C or less, about 10 seconds (reactive gas ⁇ )
- Continuous recording layer 20 about 120 ° C or less, about 30 seconds (Ar ion beam)
- FIG. 16 is an enlarged micrograph showing the shape of the divided recording element of the magnetic recording disk. No edge-shaped steps were formed at the peripheral edge of each divided recording element, and it was confirmed that the tapered angle of the side surface of each divided recording element was also suppressed, and it was processed into a good shape.
- FIG. 17 shows the relative etching rate of each part in the range of 0 to 1 assuming that the etching rate of the part where the etching progresses is the fastest is 1, and shows the absolute value of the etching progress rate. It's not something.
- Table 1 shows the line width and space width (groove width) of the bottom surface of the resist layer 26, the first mask layer 22, and the continuous recording layer 20 (divided recording element 31).
- the line width and space width of the bottom surface of the resist layer 26 were measured after the resist layer processing step (S102) and before the second mask layer processing step (S104).
- the line width and space width of the bottom surface of the first mask layer 22 were measured after the resist layer removing step and the first mask layer processing step (S106) and before the continuous recording layer processing step (S108). .
- the line width and space width of the bottom surface of the continuous recording layer 20 (divided recording element 31) were measured after the continuous recording layer processing step (S108) and before the first mask layer removing step (S110).
- FIG. 18 is an MFM image of the magnetic recording disk. Fine spot-like areas with different shades were uniformly mixed, and it was confirmed that the magnetic properties were good.
- the continuous recording layer 20 was processed by reactive ion etching using CO gas or the like as a reaction gas.
- the material of the first mask layer 22 was Ta (tantalum) having a thickness of about 25 nm, and was subjected to reactive ion etching using SF gas as a reactive gas.
- the first mask layer 22 remaining on 31 is also removed by asshing using SF gas as a reactive gas.
- the material of the second mask layer 24 was Ni (nickel) having a thickness of about 10 nm, and was processed by ion beam etching. In the reactive ion etching, the workpiece 10 was cooled using a cooling mechanism, and the workpiece 10 was processed one by one. The other conditions were the same as those in the above example.
- Second mask layer 24 about 90 ° C, about 30 seconds (Ar ion beam)
- First mask layer 22 120 ° C or less, about 20 seconds (reactive gas SF)
- Continuous recording layer 20 250-300 ° C, about 60 seconds (reactive gas CO, etc.)
- the relationship between the distance from the end of the magnetic recording disk and the etching rate in the continuous recording layer is shown by the curve labeled B in FIG. It was confirmed that the etching rate of the continuous recording layer tended to increase as it approached the edge. That is, since the etching rate is larger at the end of the object to be cut than at the other part, and the variation in the processing dimensions becomes larger, for example, the area near the end may not be used as the magnetic recording area, and the recording capacity may be reduced accordingly. Will decrease.
- Table 1 shows the line width and space width (groove width) of the bottom surface of the resist layer 26, the first mask layer 22, and the continuous recording layer 20 (divided recording element 31).
- FIG. 19 shows an MFM image of the magnetic recording disk. Fine areas with different shades are mixed, but some are shaped like a continuous line along the periphery of the divided recording element, confirming that magnetic degradation has occurred. Was.
- the magnetic recording disk of the example had better magnetic properties than the magnetic recording disk of Comparative Example 1. This is considered to be because the working time of each mask layer and the continuous recording layer is shorter than that of the comparative example 1 and the working temperature is lower.
- the cooling temperature was suppressed by using a cooling mechanism in the continuous recording layer processing step, and the continuous recording was performed by reactive ion etching without using the cooling mechanism as in the example.
- the processing temperature is further increased, and it is considered that the magnetic deterioration of the magnetic recording disk of Comparative Example 1 is further increased.
- the shape of the divided recording element was more stable than that of the magnetic recording disk of Comparative Example 1, and the variation in the shape depending on the portion was small. This is considered to be because the variation of the etching rate of the continuous recording layer depending on the portion is smaller in the example than in the comparative example 1.
- the embodiment differs from the comparative example 1 in that the continuous recording layer 20 (divided recording element 31) has the same space width at the bottom surface of the resist layer 26.
- the space width on the bottom was large. That is, the example had better transfer accuracy than the comparative example 1.
- DLC is used as the material of the first mask layer 22
- Si is used as the material of the second mask layer 24. It is considered that this is because the thickness of the second mask layer 24 was reduced, and the taper angle on the side surface of the portion to be processed was suppressed.
- a magnetic recording disk was manufactured by setting the thickness of the first mask layer to 50 nm in comparison with the above example. Other conditions were the same as those in the above-described embodiment.
- FIG. 20 is a micrograph showing the shape of the divided recording element of the magnetic recording disk in an enlarged manner. It was confirmed that an edge-shaped step was formed along the periphery of each divided recording element.
- continuous recording was performed without forming the first mask layer 22 and the second mask layer 24.
- a magnetic recording disk was manufactured by forming a resist layer 26 directly on the layer 20 and processing the continuous recording layer 20 into a predetermined pattern by ion beam etching using the resist layer 26 as a mask. Other conditions were the same as those in the above-described embodiment.
- FIG. 21 is a micrograph showing the shape of the divided recording element of the magnetic recording disk in an enlarged manner. It was confirmed that an edge-shaped step portion having a slightly larger protrusion amount than that of Comparative Example 2 was formed along the periphery of each divided recording element.
- the thickness of the first mask layer 22 is 10 nm, by setting the thickness of the first mask layer 22 to lOnm or less, the divided recording element can be reliably processed into a good shape. You can see what you can do. It is considered that if the first mask layer 22 is formed thinner than the recording layer, the divided recording elements can be processed into a generally good shape. In the case of discrete track media and patterned media, the thickness of the recording layer is expected to be about 20 nm. It is conceivable to make the layer thinner.
- the thickness of the first mask layer 22 is set to 15 nm or less, it is considered that the divided recording element can be processed into a generally good shape.
- the first mask layer 22 is preferably formed to have a thickness of at least 3 nm or more.
- the present invention can be used for manufacturing a magnetic recording medium having a recording layer divided into a number of divided recording elements.
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
- Magnetic Heads (AREA)
Abstract
Description
Claims
Priority Applications (1)
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US10/535,265 US7470374B2 (en) | 2003-07-31 | 2004-07-28 | Manufacturing method and manufacturing apparatus of magnetic recording medium |
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JP2003-283567 | 2003-07-31 | ||
JP2003283567A JP4223348B2 (ja) | 2003-07-31 | 2003-07-31 | 磁気記録媒体の製造方法及び製造装置 |
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US (1) | US7470374B2 (ja) |
JP (1) | JP4223348B2 (ja) |
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CN1717723A (zh) | 2006-01-04 |
US7470374B2 (en) | 2008-12-30 |
US20060021966A1 (en) | 2006-02-02 |
CN100383859C (zh) | 2008-04-23 |
JP2005050468A (ja) | 2005-02-24 |
JP4223348B2 (ja) | 2009-02-12 |
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