WO2005064598A1 - 凹凸パターンの凹部充填方法及び磁気記録媒体の製造方法 - Google Patents
凹凸パターンの凹部充填方法及び磁気記録媒体の製造方法 Download PDFInfo
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- WO2005064598A1 WO2005064598A1 PCT/JP2004/019109 JP2004019109W WO2005064598A1 WO 2005064598 A1 WO2005064598 A1 WO 2005064598A1 JP 2004019109 W JP2004019109 W JP 2004019109W WO 2005064598 A1 WO2005064598 A1 WO 2005064598A1
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- filler
- magnetic recording
- flattening
- etching rate
- filling
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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 for filling a concave portion of a concave-convex pattern and a method for producing a magnetic recording medium having a concave-convex pattern recording layer, which are used in the field of producing semiconductors, information recording media, and the like.
- a filler material for filling a concave portion is formed on the surface of a workpiece on which a concavo-convex pattern is formed, and then an excess filler material on the surface is removed to form a concavo-convex pattern for flattening.
- the recess filling method is widely used (see, for example, JP-T-2002-515647).
- a discrete track medium in which a magnetic recording layer is formed in a concavo-convex pattern and recording elements are radially divided As a candidate for a magnetic recording medium capable of realizing a further improvement in areal recording density, a discrete track medium in which a magnetic recording layer is formed in a concavo-convex pattern and recording elements are radially divided.
- a patterned medium in which a recording element is divided in a radial direction and a circumferential direction has been proposed (for example, see Japanese Patent Application Laid-Open No. Hei 997419).
- the flatness of the surface is emphasized in order to stabilize the flying height of the head. It is expected to fill the filler and flatten the surface of the magnetic recording layer.
- a film forming method such as a sputtering method, a CVD (Chemical Vapor Deposition) method, and an IBD (Ion Beam Deposition) method can be used.
- a processing method such as CMP (Chemical Mechanical Polishing) can be used.
- the CMP method has a problem that it requires a great deal of time and cost for cleaning and the like to remove the slurry. Furthermore, since the CMP method is a wet process, when combined with a dry process such as a step of processing an uneven pattern, there is a problem that the transfer of a workpiece becomes complicated and the efficiency of the entire manufacturing process is reduced. That is, when the CMP method is used in the flattening process, there is a problem that the production efficiency is low.
- the present invention has been made in view of the above problems, and has been made in consideration of the above problems, and provides a method of filling a concave portion of a concave / convex pattern which can efficiently fill the concave portion of the concave / convex pattern and flatten the surface. It is an object of the present invention to provide a method of manufacturing a magnetic recording medium having a magnetic recording layer of a pattern and capable of efficiently manufacturing a magnetic recording medium having a sufficiently flat surface.
- the present invention provides a method for forming a filler on a surface of a workpiece on which a concavo-convex pattern is formed, for filling a concave portion, further forming a coating on the filler,
- An object of the present invention is to solve the above-mentioned problem by removing excess filler and coating material on the surface of an object to be calorie and flattening it by a dry etching method in which the etching rate of the coating material is lower than the etching rate.
- the surface of the filler When a filler is formed on the surface of the workpiece on which the uneven pattern is formed, the surface of the filler also has an uneven shape according to the uneven pattern on the surface of the workpiece. Since the flatness of the filler is gradually smoothed while removing the surface of the filler, if the roughness of the surface of the formed filler is large, the unevenness of the surface can be sufficiently reduced even when the flatness is performed. May not be equalized.
- the inventor initially attempted to flatten the surface of the filler using dry etching such as ion beam etching.
- dry etching such as ion beam etching.
- cleaning of the slurry is not required, and the efficiency of the entire manufacturing process can be improved by combining with other dry processes.
- dry etch This is because, in general, it is considered that the protrusion tends to remove the convex portion selectively and faster than the concave portion, so that the effect of flattening the surface is high.
- the width of the convex portion is used in the meaning of the smallest width in a direction substantially perpendicular to the height direction near the upper portion of the convex portion.
- the etching rate tends to be low.
- the convex portion 104 having a relatively small width tends to have a high etching rate because it is removed relatively quickly, including the inner portion thereof.
- the average etching rate of the entire region including the concave portions around the convex portions 102 tends to be low.
- the average etching rate of the entire region including the concave portions around the convex portions 104 tends to be high. Therefore, if the kamenje conditions are adjusted to one region, as shown in Fig. 16B-D, if the etching proceeds, a difference in the surface roughness between the regions occurs, or a step occurs between the regions. Exempt.
- the uneven pattern is often not uniform on the actual surface of the workpiece, a difference occurs in the etching rate between the regions, resulting in a difference in the surface roughness between the regions, and a step in the regions. It is thought that.
- a magnetic recording medium having a magnetic recording layer of an uneven pattern such as a discrete track medium or a patterned medium, is divided into a data area and a servo area.
- the concavo-convex pattern of the magnetic recording layer is substantially constant in the data area, the concavo-convex pattern of the data area is significantly different from the concavo-convex pattern of the servo area.
- the concavo-convex pattern of the magnetic recording layer often becomes a complicated pattern corresponding to the servo information pattern. For this reason, for example, it is considered that a difference occurs in the surface roughness between the data area and the servo area, and a step occurs between the areas.
- the inventor conducted further intensive studies and completed the present invention. That is, after forming a filler on the surface of the workpiece on which the uneven pattern is formed, and further laminating a coating layer on the filler, the etching rate for the coating material is lower than the etching rate for the filler.
- the surface is flattened by removing excess filler and coating material on the surface using dry etching, the area of the projections where there are many projections with a relatively narrow width and a high etching rate are present.
- the projections are rapidly removed to the level of the recesses.
- the average etching rate of the entire region is high immediately after the start of the planarization, but the protrusions disappear or become extremely small relatively early, and the etching rate decreases. High convex There it disappeared or significantly reduced, the average etch rate of the entire area to the force relatively quickly start the flat I spoon is lowered.
- the area force is reduced while the projection remains, and the flattening is started by reducing the force, and the force is relatively delayed, so that the average etching rate of the entire region is increased.
- the coating material constituting the convex portion is substantially removed, the convex portion is rapidly removed to the level of the concave portion, and the unevenness disappears or becomes extremely small, and the etching rate of the entire region decreases.
- the ratio of the area occupied by the projections in the entire region is relatively large!
- the average etching rate of the entire region immediately after the start of flattening is shown. Is relatively high, but the projections disappear or become extremely small relatively early, and the projections with a high etching rate disappear or become extremely small. Etching rate is lowered.
- the coating material having a lower etching rate than the filler remains in the concave portion, which suppresses a change in the etching rate.However, the ratio of the occupied area of the concave portion is small! That's big.
- the curves in FIG. 17 and FIG. 18 are examples obtained by estimating the average change in the etching rate in the region of the typical concavo-convex pattern. Actually, there may be various regions in which both the width of the projections and the ratio of the occupied area of the projections are different, but the average etching rate of each region varies with time as in the case of the above example. As shown in the figure, it is considered that the average difference in the amount of processing between the regions decreases over time.
- a method for filling concave and convex concave portions are examples of the filler material for filling a concave portion.
- a stop film having a lower etching rate than the filling material for the dry etching method in the flattening step is formed on the surface of the workpiece.
- the etching rate for the coating material is higher than in the second flattening step, and a dry etching method is used.
- a dry etching method of irradiating a surface of the workpiece with a processing gas to planarize the surface is used, and The irregularities of the above (3) or (4), wherein an etching rate of the filler and the coating material is adjusted by adjusting an irradiation angle of the processing gas with respect to a surface of the workpiece. Filling method for concave portions of the pattern
- a stop film having an etching rate lower than that of the filling material for the dry etching method in the second flattening step is formed on the surface of the workpiece.
- a non-magnetic filler is formed on the magnetic recording layer of the concave / convex pattern using the method for filling concave / convex portions of the concave / convex pattern according to any one of the above (1) to (8). And a step of filling the non-magnetic filler in the concave portions of the uneven pattern by flattening the magnetic recording medium.
- the "magnetic recording layer having a concavo-convex pattern” refers to a magnetic recording layer in which a continuous recording layer is composed of a large number of recording elements divided by a predetermined pattern.
- a magnetic recording layer is formed by partially dividing a predetermined pattern and partially composed of continuous recording elements, or a part on a substrate such as a spiral magnetic recording layer having a spiral shape, for example.
- the term “magnetic recording layer” is used in the sense that it includes a continuously formed magnetic recording layer, and also includes a case where both a convex portion and a concave portion are formed in the continuous magnetic recording layer.
- 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 recording media such as MO (Magneto Optical) and heat-assisted recording media that use both magnetism and heat are also used.
- FIG. 1 is a side cross-sectional view schematically showing a structure of a starting body for processing a workpiece according to a first embodiment of the present invention.
- FIG. 2 is a side sectional view schematically showing the structure of a magnetic recording medium obtained by processing the workpiece.
- FIG. 3 is a flowchart showing an outline of a manufacturing process of the magnetic recording medium.
- FIG. 4 schematically shows the shape of the workpiece in which a concavo-convex pattern is transferred to a resist layer.
- FIG. 6 A schematic view of the shape of the work piece having a stop film formed on the magnetic recording layer Side sectional view
- FIG. 8 is a side sectional view schematically showing the shape of the workpiece in which a coating material is formed on the filler.
- FIG. 10 is a cross-sectional side view schematically showing the shape of the workpiece in which a part of the workpiece is flattened by flattening.
- ⁇ 11 A side cross-sectional view schematically showing the shape of the work piece further flattened.
- ⁇ 12 A side cross-sectional view schematically showing the shape of the work piece whose entire surface is flattened. Side sectional view schematically showing the shape of the workpiece after the flattening process is completed.
- FIG. 14 is a side sectional view schematically showing a shape of a magnetic recording medium according to a second embodiment of the present invention.
- FIG. 15 is a flowchart showing an outline of a manufacturing process of a magnetic recording medium according to a third embodiment of the present invention.
- FIG. 19 is a side sectional view schematically showing the shape of a workpiece according to another example of the present invention.
- a processing starting body of a workpiece 10 as shown in FIG. 1 formed by forming a continuous recording layer 20 and the like on a glass substrate 12 is processed.
- the continuous recording layer 20 is divided into a number of recording elements 32A to form a magnetic recording layer 32 having a predetermined concavo-convex pattern, and the non-magnetic portions 34 between the recording elements 32A (concave portions of the concavo-convex pattern) are formed.
- the present invention relates to a method for manufacturing a magnetic recording medium in which the magnetic recording medium 30 is manufactured by filling the magnetic recording medium 30 with the filler 36, and filling the filler 36, removing excess filler 36, and flattening the surface. It has features. The other steps are not considered to be important for understanding the present embodiment, and therefore the description thereof will be omitted as appropriate.
- a processing starting body of the workpiece 10 is formed on a glass substrate 12 by forming an underlayer 14, a soft magnetic layer 16, an orientation layer 18, a continuous recording layer 20, and a first mask layer 22.
- the second mask layer 24 and the resist layer 26 are formed in this order.
- the underlayer 14 has a thickness of 30 to 200 nm and is made of Cr (chromium) or a Cr alloy.
- the soft magnetic layer 16 has a thickness of 50 to 300 nm and is made of a Fe (iron) alloy or a Co (cobalt) alloy.
- the orientation layer 18 has a thickness of 3 to 30 nm, and is made of CoO, MgO, NiO, or the like.
- the continuous recording layer 20 has a thickness of 5 to 30 nm and is made of a CoCr (cobalt chromium) alloy.
- the first mask layer 22 has a thickness of 3 to 50 nm and is made of TiN (titanium nitride).
- the second mask layer 24 has a thickness of 3-30 nm and is made of Ni (nickel).
- the resist layer 26 has a thickness of 30 to 300 nm and is made of a negative resist (NBE22A manufactured by Sumitomo Chemical Co., Ltd.).
- the magnetic recording medium 30 is a perpendicular recording type discrete track type magnetic disk. As shown in FIG. 2, the magnetic recording layer 32 has a large number of continuous recording layers 20 at fine intervals in the radial direction. The concave and convex pattern shape is divided into concentric arc-shaped recording elements 32A. The Further, a stop film 35 is formed in the concave portion 34 between the recording elements 32A, and a filler 36 is filled on the stop film 35. Further, a protective layer 38 and a lubricating layer 40 are formed on the recording element 32A and the filler 36 in this order. In the magnetic recording medium 30, a magnetic recording layer 32 is formed in a predetermined servo pattern in a servo area.
- the material of the stop film 35 is a hard carbon film called diamond-like carbon.
- DLC diamond-like carbon
- the material of the filler 36 is a non-magnetic SiO (dioxide).
- the material of the protective layer 38 is DLC similarly to the stop film 35, and the material of the lubricating layer 40 is PFPE (perfluoropolyether).
- a processing starting body of the workpiece 10 shown in Fig. 1 is prepared (S102).
- the processing starting body of the workpiece 10 is formed by sputtering a base layer 14, a soft magnetic layer 16, an orientation layer 18, a continuous recording layer 20, a first mask layer 22, and a second mask layer 24 in this order on a glass substrate 12. It is obtained by forming by a method and further applying a resist layer 26 by a dive method. Incidentally, the resist layer 26 may be applied by a spin coating method.
- a transfer device (not shown) is applied to the resist layer 26 as a processing starting body of the force-resistant body 10 by using a transfer device (not shown) as shown in FIG. 4 corresponding to a predetermined servo pattern and a track pattern including a contact hole.
- the concavo-convex pattern is transferred by the nano'imprint method (S104).
- the resist layer 26 may be exposed and developed to form an uneven pattern.
- the second mask layer 24 at the bottom of the recess is removed by ion beam etching using Ar (argon) gas.
- Ar argon
- SF sulfur hexafluoride
- the continuous recording layer 20 at the bottom of the concave portion is removed (S106).
- the continuous recording layer 20 is divided into a large number of recording elements 32A as shown in FIG. A recording layer 32 is formed.
- the recording element 32A is formed by reactive ion etching using SF gas as a reactive gas.
- the first mask layer 22 remaining on the top is completely removed, and a reducing gas such as NH gas is supplied.
- a DLC stop film 35 is formed on the upper surface and side surfaces of the recording element 32A to a thickness of 120 nm by the CVD method (S108).
- the stop film 35 is also formed on the bottom surface of the concave portion 34 between the recording elements 32A.
- the filler 36 is formed on the surface of the body 10 by bias sputtering (S110). Since the SiO particles tend to deposit uniformly on the surface of the body 10,
- the sputtering gas is urged in the direction of the workpiece 10 and collides with the deposited SiO.
- the filler 36 is formed to cover the recording element 32A in a shape in which surface irregularities are suppressed to some extent, and the recess 34 is filled with the filler 36.
- FIG. 7 illustrates the uneven shape with emphasis more than the actual shape for understanding the present embodiment.
- a coating material 42 is formed on the filler 36 by a bias sputtering method (S 112).
- the material of the coating material 42 is C (carbon), and the etching rate for ion beam etching is lower than the etching rate of the filler material 36 for ion beam etching.
- the C particles are formed on the filler 36 while suppressing surface irregularities.
- the incident angle of Ar gas is in the range of -10 to 15 ° to the surface.
- the incident angle of Ar gas should be in the range of 15-90 °.
- incident angle is an incident angle with respect to the surface of the workpiece, and is used in the sense of an angle formed between the surface of the workpiece and the central axis of the ion beam. For example, when the central axis of the ion beam is parallel to the surface of the object, the incident angle is 0 °.
- the coating material 42 is removed. Since the ion beam etching tends to selectively remove the convex portions faster than the concave portions, the coating material 42 has a slightly even surface while the film thickness decreases.
- projections having a relatively wide width tend to have a low etching rate
- projections having a relatively narrow width tend to have a high etching rate
- projections having a wide width and a low etching rate In regions where there are many projections, the average etching rate of the entire region including the depressions around the projections tends to be low, and in regions where there are many projections that are narrow and have high etching rates, The average etching rate of the entire region including the peripheral concave portions also tends to be high.
- the average etching rate of the entire region is high immediately after the start of flattening, as indicated by the curve denoted by the symbol A in FIG.
- the coating material 42 constituting the convex portion is removed relatively quickly, and as shown in FIG. 9, the filler 36 having an etching rate higher than that of the coating material 42 is exposed at the convex portion early after the start of flattening.
- the convex portions are rapidly removed to the level of the concave portions, and as shown in FIG. 10, the concave and convex portions disappear or become extremely small, and the flattening starts, and the force is relatively early.
- the etching rate decreases.
- the ratio of the area occupied by the projections to the entire region is relatively small, the average etching rate of the entire region immediately after the start of the flattening as shown by the curve denoted by D in FIG.
- the protrusions disappear or become significantly smaller with a delay after the start of relatively low flatness, and the average etching rate of the entire region is further reduced.
- the coating material 42 having a lower etching rate than the filling material 36 remains. Since the occupied area ratio of the recessed portion is large, the degree of decrease in the etching rate is correspondingly small.
- the average etching rate of the entire region immediately after the start of the flattening is indicated by the curve denoted by reference symbol B in FIG. Since the low-profile protrusions remain for a relatively long time, the average etching rate of the entire region is unlikely to change. However, as shown in FIG. When the filler is exposed, the exposed filler 36 having a high etching rate is etched, so that the covering material 42 on the filler 36 is removed together with the filler 36, and as shown in FIG. 11, the protrusions gradually become thinner. The width becomes narrow. That is, since the etching rate of the projections gradually increases while the projections remain, the average etching rate of the entire region is increased due to a relatively delayed force after the start of flattening.
- the average etching rate of the entire region is relatively higher immediately after the start of the flattening, as indicated by the curve denoted by C in FIG. Although it is high, the protrusion disappears or becomes extremely small relatively early, and the protrusion with a high etching rate disappears or becomes extremely small, so that flattening starts and the force becomes relatively early evenly over the entire area. The etching rate becomes low. Further, since the occupation area ratio of the concave portion where the coating material 42 having an etching rate lower than that of the filler 36 remains is small, the degree of the decrease in the etching rate is correspondingly large.
- the width of the convex portion is reduced when the covering material 42 constituting the convex portion is substantially removed.
- the portion is rapidly removed to the level of the recess, and the unevenness disappears or is significantly reduced as shown in FIG. 12, and the etching rate of the entire region is further reduced.
- the area in the curve obtained by combining the curve labeled A in FIG. 17 and the curve labeled D in FIG. 18 corresponds to the average amount of kamen in the left region shown in FIG. 7-12.
- the area force in the curve obtained by combining the curve labeled B in FIG. 17 and the curve labeled C in FIG. 18 corresponds to the average machining amount in the right area shown in FIG. 7-12.
- Difference decreases over time it is conceivable that. Actually, there may be various regions having different widths of the protrusions and different ratios of the occupied area of the protrusions, but the average etching rate of each region shows a change over time as if the above curves were combined. The difference in the average processing amount between the regions decreases with time.
- the unevenness of the surface is eliminated or significantly reduced, and the difference in the surface roughness between the regions and the step between the regions are reduced. Also, the difference in etching rate between the regions is reduced. Accordingly, thereafter, the coating material 42 and the filler 36 are removed while maintaining the substantially flat shape of the surface, and the film thickness is reduced, and as shown in FIG. The ion beam etching is stopped when the upper surface is removed. Incidentally, the stop film 35 on the recording element 32A may be left or removed.
- the filling material 36 has a higher etching rate for ion beam etching than the covering material 42, the portion of the filling material 36 exposed between the covering materials 42 can be a concave portion. Since the etching rate is lower than that of the convex portion, the concave portion does not become excessively deep.
- the etching rate for the ion beam etching is lower than that of the filler 36 on the recording element 32A immediately below.
- the stop film 35 is formed, the recording element 32A is protected, and the etching rate of the concave portion on the recording element 32A is significantly reduced by exposing the stop film 35, and finally the flattening is achieved. Can be obtained.
- a DLC protective layer 38 having a thickness of 115 nm is formed on the upper surface of the recording element 32A and the filler 36 by the CVD method, and further a 12 nm A PFPE lubricating layer 40 is applied in a thickness (S116).
- S116 a thickness
- the recording element 32A is formed in the flattening step (S114).
- the magnetic properties that do not result in etching are not adversely affected. That is, the magnetic recording medium 30 has good recording and reproducing accuracy.
- the stop film 35 is formed on the recording element 32A, the filler 36 on the recording element 32A is surely removed without etching the recording element 32A in the flattening step (S114). In this regard, the magnetic recording medium 30 also has good recording and reproduction accuracy.
- the recording / reproducing accuracy can be further improved by removing the stop film 35 on the recording element 32A in the flattening step (S114).
- the recording element 32A can be surely protected also by the ion beam etching power. Since the stop film 35 has a relatively low etching rate for ion beam etching, the film thickness can be reduced accordingly. Even if the stop film 35 remains on the recording element 32A, the effect on the recording / reproduction accuracy is not affected. small.
- the material of the filler 36 is SiO, and the material of the coating 42 is the same.
- the etching rate for the coating material 42 is lower than the etching rate for the filler 36, and the ion beam etching using Ar gas is used as a processing gas.
- the material of the filling material 36 and the covering material 42 is, for example, another oxide or TiN (titanium oxide).
- Other non-magnetic materials such as nitride, Ta (tantalum), TaSi, Si, etc. may be used.
- a material having fluidity such as a magnetic material or a photoresist material may be used as the material of the coating material 42.
- the filler 36 and the coating material 42 are required to improve the flatness.
- the material is an amorphous material.
- the flattening step (S114) may employ ion beam etching using another rare gas such as Kr (krypton) or Xe (xenon). Fluorocarbon),
- Table 1 shows examples of preferable combinations of the filler 36, the material of the covering material 42, and the dry etching method in the flattening step (S114).
- the material of the stop film 35 is DLC.
- the present invention is not limited to this. Any material having a low etching rate in the flattening step (S114) can be used. Alternatively, another non-magnetic material may be used.
- the coating material 42 is completely removed in the flattening step (S114).
- the coating material 42 may be filled in the recess 34 together with the filler 36 so that the coating material 42 remains in the recess between the recording elements 32A.
- the material of the coating material 42 is a non-magnetic material.
- a first flattening step (S302) for partially exposing the filler 36 while flattening the surface of the body 10 by dry etching, Etching rate for 36 A second flattening process in which the excess filler 36 and the coating material 42 on the surface of the subject body 10 are removed and flattened by a dry etching method in which the etching rate of the coating material 42 is lower than that of the second flattening process.
- Excess filler 36 and coating 42 on recording element 32A may be removed in two steps (S304).
- the dry etching method in which the etching rate for the covering material 42 is higher than the etching rate for the filler 36 may be used. , Using a dry etching method.
- the first flattening step (S302) has a higher etching rate with respect to the covering material 42 than the second flattening step (S304) and uses a dry etching method.
- the production efficiency of the flattening process can be improved.
- the dry etching method in the first planarization step (S302) the production efficiency of the planarization step can be significantly improved by using reactive ion etching with a reactive gas that chemically reacts with the coating material. it can.
- the first flattening step (S302) and the second flattening step (S304) are performed by dry etching for irradiating the surface of the body 10 to be subjected to force gas for flattening.
- the etching rate for the filler 36 and the coating 42 may be adjusted by using the method and adjusting the irradiation angle of the processing gas to the surface of the workpiece 10.
- the etching rates for the filler 36 and the coating material 42 are adjusted. You may do so.
- the first and second flattening processes can be performed.
- the first and second flattening steps can be performed using a common dry etching apparatus by using a common dry etching method, and equipment costs can be reduced. It should be noted that, even when the first and second flattening steps are performed using different dry etching apparatuses, a certain effect of suppressing the equipment cost can be obtained by sharing the structure of a plurality of dry etching apparatuses. Can be In addition, by using a plurality of dry etching apparatuses, each step can be performed continuously, thereby improving production efficiency. Also, when a plurality of dry etching apparatuses are used by using a common processing gas in the first and second planarization processes. In addition, the transfer between the apparatuses becomes easy, and the production efficiency can be improved also in this respect.
- the coating 42 is continuously formed.
- the filler 36 is flattened to some extent by dry etching.
- the coating material 42 may be formed by applying force.
- the width of the convex portion of the filler 36 can be reduced to some extent in all the concavo-convex pattern areas.
- the width of the convex portion is reduced in advance before the first or third embodiment.
- the filler 36 and the coating 42 are formed by the bias sputtering method.
- the film forming method is not particularly limited.
- the filling material 36 and the covering material 42 may be formed by using another film forming method such as a CVD method or an IBD method.
- the coating material 42 may be formed by, for example, a spin coating method or a doctor blade method.
- the stop method is performed by using another film forming method.
- a film 35 may be formed.
- the incident angle of the Ar gas in the flattening step (S114) or the second flattening step (S304) in the third embodiment is set to a low angle of, for example, about 10-5 °. It has been confirmed that the etching rate of the layer 32 is lower than the etching rate of the filler 36, and since the magnetic recording layer 32 itself substantially serves as a stop film, the stop film 35 is formed. May be omitted, and the filler 36 may be formed directly on the recording element 36A.
- the continuous recording layer 20 is divided by three stages of dry etching. If the continuous recording layer 20 can be divided with high precision, the material of the resist layer and the mask layer, the number of layers, and the thickness The type of dry etching and the like are not particularly limited.
- the material of the continuous recording layer 20 is a CoCr alloy.
- another alloy containing an iron group element Co, Fe, Ni
- the present invention is also applicable to processing of a magnetic recording medium composed of recording elements of other materials such as a body.
- the underlayer 14, the soft magnetic layer 16, and the orientation layer 18 are formed below the continuous recording layer 20, but the configuration of the layer below the continuous recording layer 20 is as follows. What is necessary is just to change suitably according to the kind of magnetic recording medium. For example, one or two of the underlayer 14, the soft magnetic layer 16, and the orientation layer 18 may be omitted. Further, a continuous recording layer may be formed directly on the substrate.
- the magnetic recording medium 30 is a perpendicular recording type discrete track type magnetic disk in which the magnetic recording layer 32 is divided at fine intervals in the track radial direction.
- the present invention is naturally applicable to the manufacture of a palm (PERM) type magnetic disk having a recording layer and a magnetic disk having a spiral magnetic recording layer.
- magneto-optical disks such as MOs
- thermal assist type magnetic disks using both magnetism and heat and magnetic recording media having a recording layer with a concave / convex pattern other than the disk shape such as a magnetic tape.
- the present invention is also applicable.
- the first embodiment relates to a method for manufacturing a magnetic recording medium.
- the present invention is not limited to this.
- the present invention can be applied to other information recording media such as an optical recording medium and various other fields such as a semiconductor.
- Example 1 As in the first embodiment, the workpiece 10 was processed. Specifically, an uneven pattern including the two patterns shown in Table 2 was formed as the uneven pattern of the magnetic recording layer 32. Further, a DLC stop film 35 was formed with a thickness of 4 nm.
- a filler 36 made of SiO 2 was formed on the magnetic recording layer 32 (stop film 35) by a bias sputtering method so as to have a thickness of about 40 nm. Ar gas was used as the sputtering gas.
- the deposition power was set to about 500 W, the bias power was set to about 150 W, and the pressure in the vacuum chamber was set to about 0.3 Pa.
- a coating material 42 made of C is formed on the filler 36 by a bias sputtering method so that the film thickness becomes about 20 nm, the film forming power is about 500 W, the bias power is about 150 W, and the inside of the vacuum chamber is The film was formed at a pressure of about 0.3 Pa. Since the surfaces of the filler 36 and the covering material 42 have a shape in which the irregularities are minutely suppressed, a film thickness gauge having a substantially flat surface with negligible irregularities is installed near the workpiece 10 and the film thickness is measured. The thicknesses of the filler 36 and the coating 42 having a flat surface formed on the thickness gauge were measured as the thicknesses of the filler 36 and the coating 42 of the workpiece 10.
- the surface was flattened by ion beam etching using Ar gas as a processing gas until the excess filler 36 and coating 42 were removed in the pattern 1 area on the magnetic recording layer 32.
- the irradiation angle of Ar gas was set to about 2 ° with respect to the surface of the workpiece.
- the flattening step (S114) was performed for about 14 minutes and 5 seconds until the excess filler 36 and coating 42 were completely removed in the area of pattern 1 on the magnetic recording layer 32.
- a CF (carbon hexafluoride) gas is used as a reaction gas.
- Reactive ion beam etching was used.
- the irradiation angle of CF gas is
- the first planarization step (S302) was performed for about 3 minutes and 2 seconds until the filler 36 was partially exposed from the coating 42.
- the flattening step (S302) of Step 2 was performed for about 4 minutes and 7 seconds until the excess filler 36 and coating 42 were completely removed in the area of Pattern 1 on the magnetic recording layer 36.
- Example 3 is an experimental example of the first embodiment, similar to Example 1 described above, but a filler 36 was formed so as to have a film thickness of about 35 nm in Example 1 described above. Also, Ta (tantalum) was formed as a material of the coating material 42 in place of C so as to have a film thickness of about 4 nm. Other conditions were the same as in Example 1 above.
- the irradiation angle of the Ar gas was set to about 2 ° with respect to the surface of the target body by ion beam etching using an Ar gas as a gas for power supply, and the magnetic recording layer was formed. It took about 9 minutes and 32 seconds to remove excess filler 36 and coating 42 in the area of pattern 1 on 36.
- the surface was imaged with an atomic force microscope, and the pattern 1 region and pattern
- the center line average roughness Ra of the surface of the area 2 was measured.
- Table 3 shows the measurement results and the time required for the planarization process.
- Example 4 is an experimental example of the third embodiment, and differs from Example 3 in two steps of a first planarization step (S302) and a second planarization step (S304). Excess filler 36 and coating 42 on recording layer 32 were removed. Other conditions were the same as in Example 3 above.
- the irradiation angle of Ar gas to the surface of the workpiece is reduced to about 10 ° by ion beam etching using Ar gas as a processing gas.
- the setting was performed for about 1 minute and 18 seconds until the filling material 36 was partially exposed from the coating material 42.
- the Ar gas is applied to the surface of the object to be cured by ion beam etching using the Ar gas as a gas for power supply.
- the irradiation angle was set to about 2 °, and the process was performed for about 3 minutes and 41 seconds until the excess filler 36 and coating 42 were removed in the area of pattern 1 on the magnetic recording layer 36.
- the gas for reaction and the reaction gas used in the flattening process in Examples 14 to 14 compares the selection ratios.
- Example 1 As compared with Example 1 described above, the filler 36 was formed into a film with a thickness of about 60 nm, and the coating 42 was not formed. Other conditions were the same as in Example 1 above.
- the irradiation angle of the Ar gas was set to about 2 ° with respect to the surface of the target body by ion beam etching using Ar gas as a power gas, and the magnetic recording layer was formed. Flattening was performed for about 8 minutes and 27 seconds until excess filler 36 was removed in the area of pattern 1 on 36.
- the center line average roughness Ra of the surface of the area 2 was measured.
- Table 3 shows the measurement results and the time required for the planarization process.
- Example 2 it was confirmed that the time required for the flattening process was greatly reduced by using two flattening processes in Example 1. Similarly, in Example 4, it was confirmed that the time required for the flattening process was shortened by using two flattening processes in Example 3.
- the present invention is not limited to, for example, a magnetic recording medium having a concave-convex pattern magnetic recording layer, such as a discrete track type hard disk, and other types of concave-convex patterns which require filling of concave portions. Can be used to manufacture information recording media, semiconductor products, etc.
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- Manufacturing Of Magnetic Record Carriers (AREA)
- Magnetic Record Carriers (AREA)
- Magnetic Heads (AREA)
Abstract
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JP3881370B2 (ja) | 2007-02-14 |
CN1742323A (zh) | 2006-03-01 |
JPWO2005064598A1 (ja) | 2007-07-19 |
CN100350463C (zh) | 2007-11-21 |
US20050199581A1 (en) | 2005-09-15 |
US7300595B2 (en) | 2007-11-27 |
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