WO2005112008A1 - 薄膜磁気ヘッド用基板およびその製造方法 - Google Patents
薄膜磁気ヘッド用基板およびその製造方法 Download PDFInfo
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- WO2005112008A1 WO2005112008A1 PCT/JP2005/008792 JP2005008792W WO2005112008A1 WO 2005112008 A1 WO2005112008 A1 WO 2005112008A1 JP 2005008792 W JP2005008792 W JP 2005008792W WO 2005112008 A1 WO2005112008 A1 WO 2005112008A1
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- Prior art keywords
- film
- substrate
- thin
- intermediate layer
- magnetic head
- Prior art date
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- 239000000758 substrate Substances 0.000 title claims abstract description 182
- 239000010409 thin film Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 239000010408 film Substances 0.000 claims abstract description 197
- 239000000919 ceramic Substances 0.000 claims abstract description 99
- 239000000463 material Substances 0.000 claims abstract description 22
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 238000000151 deposition Methods 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- 229910010293 ceramic material Inorganic materials 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 238000005530 etching Methods 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims 1
- -1 aluminum oxide hydride Chemical compound 0.000 claims 1
- 239000000523 sample Substances 0.000 description 12
- 230000015556 catabolic process Effects 0.000 description 10
- 238000010292 electrical insulation Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 238000004544 sputter deposition Methods 0.000 description 7
- 230000005684 electric field Effects 0.000 description 6
- 238000000059 patterning Methods 0.000 description 6
- 230000003746 surface roughness Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910016570 AlCu Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
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- 238000005259 measurement Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001459 lithography Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000000427 thin-film deposition Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 101000872823 Xenopus laevis Probable histone deacetylase 1-A Proteins 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
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Classifications
-
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
- G11B5/3912—Arrangements in which the active read-out elements are transducing in association with active magnetic shields, e.g. magnetically coupled shields
-
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
-
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3163—Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers
Definitions
- the present invention relates to a thin-film magnetic head substrate used for a thin-film magnetic head slider of a hard disk drive, and a method of manufacturing the same.
- a hard disk drive is a typical information recording device conventionally used in personal computers and the like.
- hard disk drives In order to meet the above demands, there is a demand for larger hard disk drives and smaller devices.
- hard disk recorders that directly record images on a disk drive and audio players that record music on a disk drive have become widespread. In these devices as well, there is a need to reduce the size of the hard disk drive in order to increase the capacity and increase portability.
- FIG. 7 schematically shows a cross section of a thin-film magnetic head slider portion of a conventional hard disk drive.
- an undercoat film 13 is formed on the side surface of the substrate 12 held by the gimbal 10.
- a read element 16 as a read head is provided, and a write element 14 as a recording head is provided adjacent to the read element 16.
- a unit including the substrate 12, the write element 14, and the read element 16 held by the gimbal 10 is called a head slider or simply a slider.
- the writing element 14 is formed of a magnetic material. Coil 15 is wound inside the ring When a recording signal is applied to the coil 15, a magnetic field is generated in the writing element 14, and data is written to the magnetic recording medium 17.
- the read element 16 which is a read head, is a magnetoresistive element (MR or GMR) that converts a change in a magnetic field into a change in electric resistance. Is read and converted into an electric signal.
- MR magnetoresistive element
- the substrate 12 holding the write element 14 and the read element 16 is made of Al O T
- AlTiC Al O—TiC
- An undercoat film 13 formed from 23 is provided on the side surface of the substrate 12.
- the size of the slider also needs to be reduced.
- the area occupied by the coil 15 of the write element 14 must be reduced. Specifically, the inner diameter of the coil 15 must be reduced, and the windings must be as small as possible.
- the area of the coil is reduced as described above, the amount of heat generated per unit area when a current flows through the coil 15 via the terminal 18 increases.
- a process is performed to smooth the surface of the undercoat film, which also has a high power.
- reverse sputtering or deposition is performed before depositing the Al 2 O 3 film on the AlTiC substrate to improve adhesion.
- sputtering bias sputtering
- the deposition surface is etched.
- AlTiC substrate is a composite sintered body of different materials (Al O and TiC).
- the surface roughness Ra of the film is about 1 to 5 nm.
- the thinner the undercoat film for example, 0.4 ⁇ m or less), the more difficult it is to process for smoothing.
- Patent Document 1 discloses a conventional undercoat film 1 on a substrate 12.
- the amorphous alumina film formed by the R sputtering method is dense, it is disclosed that excellent voltage resistance can be obtained by this structure.
- Patent document 1 JP-A-11 283221
- Patent Document 2 Patent No. 1899891
- Patent Document 3 US Patent No. 4769127
- Patent Document 4 Patent No. 1659501
- Patent Document 5 US Pat. No. 4,849,915
- Patent Document 6 JP-A-2000-260999
- the present invention has been made to solve the above-described problems, and an object of the present invention is to prevent the above-described problems from occurring in a small-sized, high-recording-density hard disk drive, and to improve the reliability of the device.
- a substrate for a thin-film magnetic head and a method for manufacturing the same which are preferably used to increase the thickness.
- a substrate for a thin-film magnetic head of the present invention includes a ceramic substrate having a main surface, and an undercoat film that also has an aluminum oxide covering the main surface of the ceramic substrate, and is provided on the undercoat film.
- a substrate for a thin film magnetic head on which an electric z magnetic transducer element is formed further comprising an intermediate layer formed between a main surface of the ceramic substrate and an undercoat film, wherein the intermediate layer is formed of the aluminum.
- the ceramic substrate is formed from a substance other than the acid substance, and is also patterned so that a part of the main surface of the ceramic substrate contacts the undercoat film.
- the intermediate layer has an opening in a region where the electric Z magnetic transducer element is not formed.
- the electric Z magnetic transducer element formed on the undercoat film includes a lower magnetic shield film, a magnetoresistive element formed on the lower magnetic shield film, An upper shield film formed on the lower magnetic shield film so as to cover the resistive element, wherein the intermediate layer is a region where the magnetoresistive element is projected onto a main surface of the ceramic substrate. It is putt ceremonies so as to cover the whole area.
- the intermediate layer is patterned so as to cover the entire area where the lower magnetic shield film is projected on the main surface of the ceramic substrate.
- a part of the intermediate layer forms an alignment mark for alignment.
- a part of the intermediate layer has a pattern indicating identification information. Has formed.
- the identification information includes information unique to the ceramic substrate.
- the pattern indicating the identification information is recorded in a plurality of areas on the main surface of the ceramic substrate, and different information is assigned to each area.
- each of the plurality of regions is arranged so as to constitute a different thin-film magnetic head after the division of the substrate.
- the thickness of the intermediate layer ranges from lnm to 1 ⁇ m.
- the intermediate layer is made of a metal film or a Si film.
- the intermediate layer is Cu, an alloy containing Cu, Cr, an alloy containing Cr, or a Si film.
- the thickness of the undercoat film ranges from lOnm to 1.0 / zm.
- the ceramic substrate has a content of ⁇ -Al
- Alumina-based ceramics materials containing 23 and 2 mol% or less of additives are also produced.
- the ceramic substrate further contains a metal carbide or a metal carbonitride.
- the thin-film magnetic head slider includes the thin-film magnetic head substrate described above, and an electric Z magnetic transducer element formed on an undercoat film of the thin-film magnetic head substrate.
- a hard disk drive device of the present invention includes the above thin-film magnetic head slider.
- a method for manufacturing a substrate for a thin film magnetic head according to the present invention includes a ceramic substrate having a main surface, and an undercoat film covering the main surface of the ceramic substrate, and an electric Z magnetic transducer element is formed on the undercoat film.
- the step of forming the patterned intermediate layer includes the steps of: depositing a film made of a material other than the aluminum oxide on the ceramic substrate; Forming a patterned resist mask, forming a patterned intermediate layer by etching the film, and removing the resist mask.
- the step of forming the patterned intermediate layer includes: a step of forming a patterned resist mask on the ceramic substrate; and a step other than the aluminum oxide on the resist mask. Depositing a film made of a material, and forming the patterned intermediate layer from a part of the film by lift-off for removing the resist mask.
- the step of forming the patterned intermediate layer on the ceramic substrate includes forming an opening in a region where the electric Z magnetic transducer element is not formed. Pattern the intermediate layer.
- the method for manufacturing a thin film magnetic head slider according to the present invention includes the steps of preparing the thin film magnetic head substrate described above and forming an electric Z magnetic transducer element on the undercoat film. Is included.
- a substrate for a thin-film magnetic head having excellent reliability is provided because the function of the patterned intermediate layer improves the electric withstand voltage characteristic of the undercoat film made of aluminum oxide. Is done.
- FIG. 1 is a sectional view showing the structure of a substrate for a thin-film magnetic head according to the present invention.
- FIG. 2 is a schematic diagram showing a configuration of an apparatus for measuring a withstand voltage.
- FIG. 3 is a graph showing a relationship between a withstand voltage and a thickness of an intermediate layer.
- FIG. 4 is a graph showing the relationship between the thickness of an undercoat film and the withstand voltage.
- FIG. 5 is a graph showing a relationship between a bias electric field and a leak current.
- FIG. 6 is a perspective view showing a main part of the thin-film magnetic head slider of the present invention.
- FIG. 7 (a) is a cross-sectional view schematically showing the structure of a conventional thin-film magnetic head slider
- FIG. 7 (b) is a plan view schematically showing the shape of a write element.
- FIG. 8 (a) is a layout diagram showing an arrangement relationship between an electric Z magnetic transducer element and a patterned intermediate layer 2 in the present embodiment, and FIG. FIG.
- FIG. 9 is a drawing related to Example 2 of the present invention, and is a schematic diagram showing a part of a main surface of a wafer-like substrate in an enlarged manner.
- FIG. 10 is a graph showing measurement results of surface roughness.
- the surface of the substrate before the undercoat film is deposited depends on the presence of the intermediate layer. It will function as a flat conductive surface. Since the surface roughness Ra of the undercoat film made of aluminum oxide sulfide deposited thereon has a small value of about 0.3 to lnm, it is unnecessary or extremely easy to perform a smooth anneal treatment after film formation. become.
- the substrate for a thin-film magnetic head according to the present embodiment includes a ceramics substrate 1, an undercoat film 3, and an intermediate layer 2 sandwiched between the ceramics substrate 1 and the undercoat film 3.
- the ceramic constituting the ceramic substrate 1 preferably has a volume resistivity in a range that does not accumulate static electricity in order to prevent electrostatic breakdown.
- the volume resistivity is preferably 1 ⁇ 10 9 ⁇ ′cm or less. This value is also the upper limit of the volume resistivity of a material called a semiconductive material.
- the volume resistivity is preferably at 1 X 10- 5 ⁇ 'cm or more. Reasons force on than the volume resistivity of the even ceramic substrate is preferably in the range of 1 X 10- 5 ⁇ 1 X 10 9 ⁇ 'cm.
- the ceramic substrate 1 is also preferably formed of a material having high thermal conductivity.
- the thermal conductivity must be 5 WZmK or more. Preferable It is more preferable that it be 15 WZmK or more.
- ceramics of various compositions can be used as the material of the ceramics substrate 1.
- a substrate having a composite ceramic power of two or more different in conductive or insulating properties can be used. By using the compound, a remarkable effect of the present invention can be obtained.
- the ceramic substrate 1 contains 24-75 mol% of ⁇ -Al ⁇ , and the balance is
- a metal carbide or carbonitride and 2 mol% or less of a sintering aid is suitable as a substrate used for a thin-film magnetic head slider because it can be finished to a highly accurate surface roughness with very few opening defects.
- a substrate made of ceramics containing 23 to 75 mol% of TiC and 2 mol% or less of a sintering aid is suitably used for a thin film magnetic head slider.
- examples of the ceramic substrate that can be used in the present invention include a substrate using a SiC-AlO-based ceramic material disclosed in Patent Documents 2 and 3,
- the intermediate layer 2 makes the surface of the substrate on which the undercoat film 3 is formed uniform, and a part of the undercoat film 3 reacts with the ceramic substrate 1 to change to a conductive compound. It is formed on the ceramic substrate 1 so as not to do so. Therefore, it is preferable that the intermediate layer 2 has a uniform composition and can cover the entire surface of the ceramic substrate 1 so that the surface state of the ceramic substrate 1 can be made uniform. Further, the intermediate layer 2 is preferably formed of a material having excellent heat conductivity and adhesion.
- the entire surface of the ceramic substrate 1 can be uniformly covered with the intermediate layer having a thickness of l nm or more. It is possible. If the thickness of the intermediate layer 2 is 3 nm or more, it is possible to more reliably cover the entire surface of the ceramic substrate 1 uniformly. However, when the thickness of the intermediate layer 2 is smaller than 1 nm, the possibility of exposing the surface of the ceramic substrate 1 that is difficult to cover the entire surface of the ceramic substrate 1 increases. On the other hand, as long as the surface of the substrate on which the undercoat film 3 is formed can be made uniform, the effect of the present invention can be obtained even if the intermediate layer 2 is thick.
- the intermediate layer 2 preferably has a thickness of 1 nm or more and 1 m or less, more preferably 3 nm or more and 100 nm or less.
- the intermediate layer 2 having such characteristics, it is preferable to use a non-insulating layer made of a metal film or a silicon film.
- a non-insulating layer made of a metal film or a silicon film.
- the adhesiveness and thermal conductivity are excellent, it is preferable to form the intermediate layer 2 from Cu, Cr, Si, or an alloy containing Cu or an alloy containing Cr.
- the intermediate layer 2 may be formed using Ni, Au, Ag, Fe, Co, or Ti.
- the undercoat film 3 is made of an amorphous aluminum oxide. It is preferable that the undercoat film 3 has a thickness of at least lOnm in order to provide insulation properties exhibiting a predetermined withstand voltage or more. Further, the undercoat film 3 has a thickness of 1 ⁇ m or less in order to quickly conduct heat generated in the write element and the read element formed on the undercoat film 3 to the ceramic substrate 1 side. Is preferred.
- the effect of the present invention is remarkably exhibited when the thickness of the undercoat film 3 is 0.4 m or less.
- the thickness of the undercoat film 3 must be accurately set to a predetermined value of 0.4 / zm or less. It is difficult. Therefore, it can be said that the effect of the present invention can be widely obtained when the thickness of the undercoat film 3 is set to a value of 1.0 m or less.
- a thin-film magnetic head substrate that maintains excellent electrical insulation characteristics while improving thermal conductivity by reducing the thickness of the undercoat film is realized.
- a thin-film magnetic head substrate using a metal layer as an intermediate layer has become a conventional technology in that a metal layer is used to enhance insulation. Based on new ideas.
- a bias was printed on an AlTiC substrate 1 containing 70vol% a-A1O and 30vol% TiC.
- An intermediate layer 2 having various thicknesses of Cr, Cu and S was also formed by a sputtering method without adding a metal. Thereafter, an undercoat film 3 having various thicknesses and also having an aluminum oxide siding property was formed. The undercoat film 3 is formed using an AlO target while applying a noise voltage.
- the withstand voltage of the prepared sample was measured.
- An AlCu film having a thickness of 1 ⁇ m was formed on the undercoat film 3 of each sample, and a resist pattern having 240 ⁇ m square patterns formed at 240 ⁇ m intervals was formed on the AlCu film. Thereafter, using the resist pattern as a mask, the AlCu film, the undercoat film 3 and the intermediate layer 2 were removed by wet etching, and the resist was peeled off.
- a microammeter 34 (R8340 manufactured by Advantest) was used. Each sample 32 was adsorbed to the stage 31 connected to one end of the microammeter 34, and the probe 33 connected to the other end of the microammeter was brought into contact with the AlCu pattern. Then, the applied voltage was increased by 100 V from OV, and the flowing current was measured. When a current of 100 A or more flowed, it was determined that insulation breakdown had occurred, and the voltage at that time was regarded as withstand voltage.
- FIG. 3 is a graph in which the value of the withstand voltage with respect to the thickness of the intermediate layer 2 that also becomes Cr force is plotted.
- the thickness of the undercoat film 3 is 0.2 m, and the withstand voltage is indicated by a value divided by the thickness of the undercoat film.
- the withstand voltage increases to 17 MVZcm when the intermediate layer 2 having a force of 3 nm having a withstand voltage of lOMVZcm is provided.
- the thickness of the intermediate layer 2 is 3 nm or more, the value of the withstand voltage is almost constant. This indicates that if the surface of the ceramic substrate 3 can be almost completely covered, there is an effect of improving the withstand voltage regardless of the thickness of the intermediate layer 2.
- FIG. 4 is a graph plotting the value of the withstand voltage with respect to the thickness of the undercoat film.
- the intermediate layer is made of a Si film, a Cr film, or a Cu film, and has a thickness of 30 nm.
- the withstand voltage is shown by the value divided by the thickness of the undercoat film.
- the withstand voltage when an undercoat film is formed without providing an intermediate layer is also shown. As shown in the figure, when the intermediate layer was not provided and the thickness of the undercoat film was 0.3 m or less, the withstand voltage was deteriorated. On the other hand, when the intermediate layer is provided, a withstand voltage of about 14.5 MVZcm is exhibited regardless of the thickness of the undercoat film. That is, when the intermediate layer is provided, the withstand voltage per unit thickness of the undercoat film is equal, and the undercoat film shows a withstand voltage value calculated from the thickness.
- FIG. 5 is a graph plotting the leak current with respect to the applied voltage when the thickness of the undercoat film 3 is 0.15 ⁇ m.
- the applied voltage is indicated by a bias electric field divided by the thickness of the undercoat film 3.
- the bias electric field increases, the leakage current monotonously increases, and dielectric breakdown occurs when the bias electric field becomes about 15 MV / cm. ing.
- the comparative sample without the intermediate layer 2 the force at which the bias electric field was increased, the leak current increased sharply, and breakdown occurred when the bias electric field reached about 6 MV / cm. ing.
- the leakage current immediately before the dielectric breakdown occurs is about InA in the case of the sample according to the present invention having the intermediate layer 2, whereas it is about 10 mA in the case of the comparative sample without the intermediate layer 2. . That is, in the comparative sample having no intermediate layer 2, the leak current increased before the dielectric breakdown occurred, and although the dielectric breakdown did not occur, the electrical insulation characteristics were deteriorated. On the other hand, it can be seen that the sample according to the present invention having the intermediate layer 2 maintains good electrical insulation properties until the dielectric breakdown occurs.
- FIG. 6 is a perspective view showing a main part of the thin-film magnetic head slider 80. Although the gimbal of the thin-film magnetic head slider 80 is not shown in FIG. 6, the main part shown in FIG. 6 is attached to the gimbal just like FIG.
- the thin-film magnetic head slider 80 is formed on the ceramic substrate 1, the intermediate layer 2 deposited on the ceramic substrate 1, the undercoat film 3 deposited on the intermediate layer 2, and the undercoat film 3.
- the shield film 85 is provided.
- a Cr film having a thickness of 10 ⁇ m is formed as the intermediate layer 2, and an aluminum oxide film having a thickness of Lm is deposited as the undercoat film 3.
- a gap 86 of about 0.4 m is provided on the shield film 85, and a GMR element 87 for reproduction is arranged in the gap 86.
- the GMR element 87 has a known configuration having electrodes and a GMR film (not shown).
- the gap 86 is formed from an insulating film such as alumina deposited on the shield film 85 so as to cover the GMR element 87.
- the thickness of the GMR element 87 is, for example, about 0: m.
- the magnetic element (reproducing element) formed on the shield film 85 is not limited to a GMR element. Other types of elements such as MR element and TMR element may be used! /.
- a shield film 88 is deposited on the insulating film functioning as the gap 86.
- the shield films 85 and 88 are formed of a soft magnetic material such as permalloy, and also function as magnetic shield films.
- a top pole (thickness: 2 to 3 ⁇ m) 90 is formed on the shield film 88 via a write gap 89 of 0.4 to 0.6 / zm !.
- a coil pattern 91 formed by patterning a Cu film having a thickness of about 5 ⁇ m is provided between the shield film 88 and the top pole 90. The periphery of the coil pattern 91 is covered with an organic insulating film.
- the recording head is composed of the coil pattern 91 and the top pole 90.
- the thin-film magnetic head slider 80 prepares, for example, a wafer-like thin-film magnetic head substrate in which the intermediate layer 2 and the undercoat film 3 are formed on the ceramic substrate 1, and overlies the shield film 85 on this substrate.
- the structure up to the coat 92 is formed using ordinary thin film deposition technology or lithography technology. Thereafter, the substrate is divided into chips, and the head portion shown in FIG. 7 is completed. Then, the thin film magnetic head slider is completed by mounting an ABS (Air Bearing Surface) on a gimbal.
- the thickness of the undercoat film 3 is set to 1
- the thermal conductivity is improved to / z m, excellent electrical insulation can be maintained. Therefore, the excellent heat dissipation prevents TPTR due to the heat generated by the writing element, and also prevents electrostatic breakdown and dielectric breakdown of the thin-film magnetic head slider. Therefore, it is possible to make the thin-film magnetic head slider smaller.
- the intermediate layer 2 is formed on the entire surface of the ceramic substrate 1, but the present invention is not limited to such a case.
- the thin-film magnetic head maker who purchased the thin-film magnetic head substrate with the undercoat film 3 formed thereon performs various thin-film deposition steps and puttering steps on the undercoat film 3 to form a thin-film magnetic head.
- Complete the magnetic head slider In order to perform this patterning step, it is necessary to form a resist mask pattern at an appropriate position on the ceramic substrate 1 during the photolithography. For this purpose, it is necessary to align a mask, and it is essential to form an alignment mark on the ceramic substrate 1.
- the alignment mark indicates the light reflectance of the light-reflectance to be formed at the surface of the undercoat film 3 or at a level higher than the surface in any stage of the manufacturing process of the thin-film magnetic head slider. If the intermediate layer 2 made of a material such as a high metal is present on the entire main surface of the ceramic substrate 1, it becomes difficult to optically detect the alignment mark as much as the photolithography.
- the intermediate layer 2 does not need to exist on the entire main surface of the ceramic substrate 1, and an opening is formed in a region where the electric Z magnetic transducer element is not formed. It was found that the above-mentioned effect obtained by the intermediate layer 2 was sufficiently exhibited even if the intermediate layer 2 had a portion.
- an electric Z magnetic transducer element is formed in order to improve the withstand voltage of the undercoat film 3 by the intermediate layer 2, a region where the withstand voltage is particularly problematic in the undercoat film 3, that is, an electric Z magnetic transducer element is formed. It is sufficient if the intermediate layer 2 is provided in the region where the intermediate layer 2 is provided. Specifically, the pattern of the intermediate layer 2 may be provided in a region where the electric Z magnetic transducer element is formed. When the electric Z magnetic transducer element has a lower and upper magnetic shield film and a magnetoresistive element (for example, a GMR element) sandwiched between these magnetic shield films, the intermediate layer 2 includes the magnetoresistive element. It is preferable that the pattern is formed so as to cover the entire area projected on the main surface of the ceramic substrate 1.
- the patterned intermediate layer 2 can be formed by various methods. For example, after depositing a film having the material strength of the intermediate layer 2 on the ceramic substrate 1, a resist mask (not shown) is formed on the film by lithography. The resist mask has been exposed and developed so as to have a pattern that defines the final pattern of the intermediate layer 2. If the film covered with such a resist mask is etched from the region, the intermediate layer 2 patterned into a desired shape can be obtained.
- the method of patterning the intermediate layer 2 is not limited to the above method, but may be a so-called lift-off method.
- a resist mask (not shown) is formed on the ceramic substrate 1, and then a film having a material strength of the intermediate layer 2 is deposited on the resist mask layer.
- a film having a material strength of the intermediate layer 2 is formed on the main surface of the ceramic substrate 1.
- FIG. 8 (a) is a layout diagram showing an arrangement relationship between the electric Z magnetic transducer element and the patterned intermediate layer 2 in the present embodiment
- FIG. FIG. 4 is a sectional view taken along line B ′.
- coils and terminal electrodes are not shown for simplicity.
- the intermediate layer 2 has the magnetic shield film 85 on the main surface of the ceramic substrate 1.
- the pattern is formed so as to cover the entire projected area.
- the intermediate layer 2 is removed in the area where the magnetic shield film 85 does not exist.
- mask alignment can be appropriately detected in a step of depositing and patterning a thin film on the undercoat film 3 by a known method. You.
- the shape, size, and position of the patterned intermediate layer 2 are not limited to those shown in FIG. The important point is that the intermediate layer 2 is located in a region where the electric Z magnetic transducer element is formed, and is patterned so as not to overlap with the alignment mark formed on the undercoat film 3! /, To be. If the position where the alignment mark is to be formed is unknown, it is necessary to design the opening of the intermediate layer 2 (the area where the intermediate layer does not exist) to be large. Even in such a case, the opening is smaller than the magnetic shield film 85. There is no need to putter jung. This is because the alignment mark is not formed at a position overlapping the region where the lower magnetic shield film is formed.
- the above-mentioned alignment mark is a mark defined by an uneven pattern formed from the surface of the undercoat film 3 or another film deposited on the undercoat film 3. Such an alignment mark can be formed at an arbitrary position by a magnetic head slider manufacturer who has purchased a thin-film magnetic head substrate with the undercoat film 3 formed thereon.
- a thin film magnetic head substrate maker preliminarily sets an alignment mark (“first alignment mark” below the undercoat film 3).
- Such an alignment mark is used to properly align the lower magnetic shield film 85 and the pattern forming the other electro-Z magnetic transducer elements with respect to the patterned intermediate layer 2.
- the magnetic head slider maker who purchased the thin film magnetic head substrate of the present invention undercoats the second alignment mark based on the first alignment mark existing on the ceramic substrate 1. It can be formed from the surface of the film 3 or another film deposited on the undercoat film 3. By doing so, the positional relationship between the first alignment mark and the second alignment mark is determined. After that, when the electric Z magnetic transducer element is formed with reference to the second alignment mark, the pattern and electric pattern of the intermediate layer 2 located below the undercoat film 3 are finally determined.
- the arrangement with the Z magnetic transducer element has the relationship as designed.
- Such a first alignment mark is preferably formed simultaneously from a film for forming the intermediate layer 2 when patterning the intermediate layer 2.
- a large number of thin film magnetic head sliders are formed from the ceramic substrate 1 in the form of a wafer. It is necessary to arrange the puttered intermediate layer 2 at the position. However, it is sufficient that two or more first alignment marks are formed on one wafer-shaped ceramic substrate 1.
- FIG. 9 is a schematic diagram showing an enlarged part of the main surface of the wafer-shaped ceramic substrate according to the present invention.
- Figure 9 shows five of the individual thin-film magnetic head slider chips that are ultimately separated.
- the above-described first alignment mark is formed in a region other than a rectangular region for each chip on the main surface of the wafer-shaped ceramic substrate. Since such first alignment marks are formed by patterning from the same film as the intermediate layer 2, the positional relationship between the patterns formed in the individual chip regions and the first alignment marks is accurate. Stipulated in
- a pattern indicating “identification information” may be formed while forming the first alignment mark from the same film as the intermediate layer 2 or without forming the first alignment mark.
- identification information may include information for identifying each magnetic head slider that is finally divided, which preferably includes information unique to the ceramic substrate 1.
- a set of codes such as “AB02”, “AB11”, “AB12”, “AB21”, “AB22” is recorded in a part of the rectangular area for each chip.
- identification information is provided between the undercoat film 3 and the ceramics substrate 1, defective magnetic head sliders may cause defective parts of the thin film magnetic head substrate of any manufacturer. There is an advantage that it is determined whether or not a problem has occurred, and traceability is improved. Note that the identification information is obtained in a region where a member such as a terminal electrode is not finally formed. It is preferable to form it in a position that can be easily detected from the outside.
- the identification information is based on the force formed on the main surface of the ceramic substrate 1 on the side on which the electric Z magnetic transducer element is not formed. Since the pattern indicating the identification information is formed when notching is performed, the identification information is formed on the main surface on which the electric Z magnetic transducer element is formed. Therefore, the identification information is formed in a region that is not covered by the electric Z magnetic transducer element or the terminal electrode.
- Example 2 The same substrate as in Example 1 was prepared, an intermediate layer made of Cr was deposited on the AlTiC substrate by the same method as in Example 1, and an undercoat film was deposited thereon (Example). On the other hand, an undercoat film was deposited on an AlTiC substrate by the same method as described above except that the intermediate layer was not formed (Comparative Example).
- FIG. 10 is a graph showing the measurement results.
- “with intermediate layer”, “without intermediate layer”, and “before film formation” mean “example”, “comparative example”, and “AlTiC substrate before film formation”, respectively. .
- the surface of the undercoat film can be smoothed.
- the substrate for a thin-film magnetic head of the present invention has excellent thermal conductivity and electrical insulation, and thus can be suitably used for a highly reliable thin-film magnetic head slider and a high-density recording hard disk drive.
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/559,704 US8159783B2 (en) | 2004-05-17 | 2005-05-13 | Substrate with intermediate layer for thin-film magnetic head and method of manufacturing the substrate with intermediate layer |
GB0601106A GB2420002B (en) | 2004-05-17 | 2005-05-13 | Substrate for thin film magnetic head and method for manufacturing same |
JP2006519539A JP4389932B2 (ja) | 2004-05-17 | 2005-05-13 | 薄膜磁気ヘッド用基板およびその製造方法 |
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JP2004146493 | 2004-05-17 | ||
JP2004-146493 | 2004-05-17 |
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WO2005112008A1 true WO2005112008A1 (ja) | 2005-11-24 |
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PCT/JP2005/008792 WO2005112008A1 (ja) | 2004-05-17 | 2005-05-13 | 薄膜磁気ヘッド用基板およびその製造方法 |
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JP (1) | JP4389932B2 (ja) |
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US9165584B2 (en) * | 2013-07-09 | 2015-10-20 | Seagate Technology Llc | Air bearing surface having temperature/humidity compensation feature |
US10020614B1 (en) | 2017-04-14 | 2018-07-10 | Te Connectivity Corporation | Pluggable module having a latch |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11339229A (ja) * | 1998-05-25 | 1999-12-10 | Kyocera Corp | 薄膜磁気ヘッド用基板およびこれを用いた薄膜磁気ヘッド |
JP2004127442A (ja) * | 2002-10-04 | 2004-04-22 | Sumitomo Special Metals Co Ltd | 薄膜磁気ヘッド用基板およびその製造方法 |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0622053B2 (ja) | 1986-04-23 | 1994-03-23 | 住友特殊金属株式会社 | 基板材料 |
JPS62278164A (ja) | 1986-05-26 | 1987-12-03 | 住友特殊金属株式会社 | 磁気ヘツド・スライダ用材料 |
JPH053143A (ja) * | 1991-04-19 | 1993-01-08 | Hitachi Ltd | 位置合せ方法および装置 |
JPH05325134A (ja) * | 1992-05-28 | 1993-12-10 | Alps Electric Co Ltd | 薄膜磁気ヘッド |
US6078479A (en) * | 1993-08-10 | 2000-06-20 | Read-Rite Corporation | Magnetic tape head with flux sensing element |
US5901021A (en) | 1995-05-19 | 1999-05-04 | Sanyo Electric Co., Ltd. | Thin-film magnetic head |
JPH0981915A (ja) * | 1995-07-12 | 1997-03-28 | Fujitsu Ltd | 磁気抵抗効果素子及び磁気記録装置 |
JPH1083517A (ja) * | 1996-09-10 | 1998-03-31 | Alps Electric Co Ltd | 薄膜磁気ヘッド及びその製造方法 |
US5936811A (en) * | 1997-06-12 | 1999-08-10 | International Business Machines Corporation | Magnetic head with vialess lead layers from MR sensor to pads |
US6048632A (en) * | 1997-08-22 | 2000-04-11 | Nec Research Institute | Self-biasing, non-magnetic, giant magnetoresistance sensor |
JP3450178B2 (ja) | 1998-03-31 | 2003-09-22 | 京セラ株式会社 | 薄膜磁気ヘッド用基板の製造方法 |
JP3357313B2 (ja) | 1999-03-11 | 2002-12-16 | 住友特殊金属株式会社 | 薄膜磁気ヘッド、薄膜磁気ヘッド用基板、および薄膜磁気ヘッド用基板の製造方法 |
US6538843B1 (en) * | 1999-11-09 | 2003-03-25 | Matsushita Electric Industrial Co., Ltd. | Magnetic head |
JP2001358381A (ja) * | 2000-06-14 | 2001-12-26 | Fujitsu Ltd | 磁気抵抗効果膜、磁気抵抗効果型ヘッド、および情報再生装置 |
JP3659898B2 (ja) * | 2000-11-27 | 2005-06-15 | Tdk株式会社 | 薄膜磁気ヘッドおよびその製造方法 |
US6924090B2 (en) * | 2001-08-09 | 2005-08-02 | Neomax Co., Ltd. | Method of recording identifier and set of photomasks |
JP3854204B2 (ja) * | 2002-07-22 | 2006-12-06 | アルプス電気株式会社 | 薄膜磁気ヘッド |
US6870706B1 (en) * | 2002-08-07 | 2005-03-22 | Headway Technologies, Inc. | Method for suppressing tribocharge in the assembly of magnetic heads |
US7170713B2 (en) * | 2002-08-08 | 2007-01-30 | Hitachi Global Storage Technologies Netherlands B.V. | Heat sink for a magnetic recording head |
JP3691833B2 (ja) | 2003-07-28 | 2005-09-07 | 株式会社Neomax | 薄膜磁気ヘッド用基板およびその製造方法 |
JP2005109243A (ja) * | 2003-09-30 | 2005-04-21 | Tdk Corp | 磁気抵抗効果素子及び磁気ヘッド |
US7369358B2 (en) * | 2004-02-05 | 2008-05-06 | Seagate Technology Llc | Grounded writer core |
-
2005
- 2005-05-13 JP JP2006519539A patent/JP4389932B2/ja active Active
- 2005-05-13 WO PCT/JP2005/008792 patent/WO2005112008A1/ja active Application Filing
- 2005-05-13 GB GB0601106A patent/GB2420002B/en active Active
- 2005-05-13 US US10/559,704 patent/US8159783B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11339229A (ja) * | 1998-05-25 | 1999-12-10 | Kyocera Corp | 薄膜磁気ヘッド用基板およびこれを用いた薄膜磁気ヘッド |
JP2004127442A (ja) * | 2002-10-04 | 2004-04-22 | Sumitomo Special Metals Co Ltd | 薄膜磁気ヘッド用基板およびその製造方法 |
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US8159783B2 (en) | 2012-04-17 |
GB2420002B (en) | 2008-12-10 |
US20060187588A1 (en) | 2006-08-24 |
JP4389932B2 (ja) | 2009-12-24 |
JPWO2005112008A1 (ja) | 2008-03-27 |
GB0601106D0 (en) | 2006-03-01 |
GB2420002A (en) | 2006-05-10 |
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