WO2007105477A1 - 磁気ヘッド用基板、磁気ヘッドおよび記録媒体駆動装置 - Google Patents
磁気ヘッド用基板、磁気ヘッドおよび記録媒体駆動装置 Download PDFInfo
- Publication number
- WO2007105477A1 WO2007105477A1 PCT/JP2007/053556 JP2007053556W WO2007105477A1 WO 2007105477 A1 WO2007105477 A1 WO 2007105477A1 JP 2007053556 W JP2007053556 W JP 2007053556W WO 2007105477 A1 WO2007105477 A1 WO 2007105477A1
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- WO
- WIPO (PCT)
- Prior art keywords
- magnetic head
- less
- mass
- sintered body
- conductive compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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- GDOPTJXRTPNYNR-UHFFFAOYSA-N CC1CCCC1 Chemical compound CC1CCCC1 GDOPTJXRTPNYNR-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
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- G11B5/127—Structure or manufacture of heads, e.g. inductive
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- 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
- G11B5/3173—Batch fabrication, i.e. producing a plurality of head structures in one batch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/60—Fluid-dynamic spacing of heads from record-carriers
- G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
- G11B5/6082—Design of the air bearing surface
Definitions
- the present invention relates to a recording medium drive such as a hard disk drive and a tape drive, a magnetic head used for the same, and a magnetic head substrate for forming a slider which is a base of the magnetic head.
- a magnetic thin film is used as a magnetic head for recording and reproduction of a high density magnetic disk.
- the magnetic head is required to be excellent in wear resistance, surface smoothness on the air bearing surface, mechanical force, and the like.
- a base film of amorphous alumina force is formed on a ceramic substrate by sputtering, and an electromagnetic conversion element is mounted on the base film.
- the electromagnetic transducer exhibits the magnetoresistance effect.
- an electromagnetic conversion element for example, an MR (Magnetro Resistance) element “hereinafter referred to as” MR element ", a GMR (Giant Magnetro Resistive) element” hereinafter referred to as “GMR element”, or TMR (Tunnel) Magnetro Resistive) elements (hereinafter referred to as "TMR elements”) are used.
- the ceramic substrate on which the electromagnetic conversion element is mounted is cut into strips, and the cut surface is polished to form a mirror surface, and then a part of the mirror surface is removed to form a recess.
- the recess is formed by ion milling and reactive ion etching.
- the magnetic substrate is obtained by dividing the strip-shaped ceramic substrate into chips. In the magnetic head obtained in this manner, the portion which is not removed but remains as a mirror surface becomes an air bearing surface which is made to face the magnetic recording medium, and the concave portion functions as a flow passage for passing air for floating the magnetic head.
- the flying height (gap) of the magnetic head relative to the recording medium must be extremely low at 10 nm or less.
- the flying height of the magnetic head If it is smaller, the influence of heat generated by the coil force of the electromagnetic conversion element in the magnetic head becomes relatively strong, causing a problem that the recording stored in the recording medium is destroyed.
- alumina based composite ceramics are adopted as a material for forming a slider (substrate for a magnetic head) in a magnetic head.
- various things are proposed as an alumina type composite ceramics (for example, refer patent documents 1-4).
- Patent Document 1 discloses an alumina-based composite ceramic in which titanium nitride fine particles having a particle size of 2.0 m or less are dispersed in the crystal grains of alumina having crystal grains of 0.5 m ⁇ : LOO m. It is done. This alumina-based composite ceramic is intended to improve strength and heat resistance.
- Patent Document 2 contains 10 to 25% by weight of titanium nitride, and titanium nitride ultrafine particles are uniformly dispersed in alumina crystal grains, and has a relative density of 96% or more and a volume resistivity of 1 X 1
- an alumina-based composite ceramic having a sintered body power controlled to a range of 0 4 to 5 ⁇ 10 6 ⁇ ′cm. This alumina-based composite ceramic is intended to achieve high strength, high density, and optimization of specific resistance.
- Patent Document 3 discloses that 77 to 96% by volume of alumina particles, titanium carbide, titanium nitride, zirconium carbide, zirconium nitride, hafnium carbide, hafnium nitride, hafnium carbide, niobium carbide, niobium nitride, tantalum carbide and nitrided
- the group force which also has a tantalum power contains 4 to 23% by volume of one or more kinds of conductive compound particles selected, and the average particle diameter of both the alumina particles and the conductive composite particles is 5 ⁇ m or less, Area resistivity
- This alumina-based composite ceramic is intended to make it possible to carry out useful charge removal in electronic parts.
- Patent Document 4 exemplifies various ceramics for a magnetic head, and an alumina-tungsten carbide sintered body is illustrated as an alumina-based composite material.
- Patent Document 1 JP-A-2-229756
- Patent Document 2 Japanese Patent Application Laid-Open No. 8-119112
- Patent Document 3 Patent No. 3313380
- Patent Document 4 Japanese Patent Application Laid-Open No. 2000-348321
- Patent Documents 1 to 3 are difficult to adopt for a magnetic head which is not intended to be adopted as a slider material of a magnetic head. is there.
- the alumina-based composite ceramic disclosed in Patent Document 1 is a high-strength, high thermal shock resistance composite ceramic, the fracture toughness is also enhanced. For this reason, it is also difficult to process the magnetic head substrate, which has low machinability, into a magnetic head.
- Patent Document 2 and Patent Document 3 are high-density composite ceramics, they have low conductivity for use in a magnetic head.
- the alumina-based composite ceramics proposed in Patent Documents 1 to 3 have a problem that machinability or conductivity is low when they are adopted for a magnetic head. .
- the alumina / tungsten carbide sintered body disclosed in Patent Document 4 is for a magnetic head, but has a problem that the mechanical property is poor. That is, since tungsten has a large specific gravity with respect to alumina, it tends to cause “sedimentation aggregation etc. to occur when uniformly mixing the raw material powder in the manufacturing process. Therefore, in the obtained substrate for a magnetic head, ion milling processing in manufacturing a magnetic head using a substrate for a magnetic head that causes aggregation defects can not perform high-precision processing due to the aggregation defects. . As a result, it becomes difficult to control the flying surface of the magnetic head to the target surface roughness, and it becomes difficult to keep the flying height of the magnetic head constant. In particular, it can not be adopted as a low-profile magnetic head.
- An object of the present invention is to provide a material for a magnetic head having both machinability and conductivity.
- the conductive compound comprises a sintered body containing 35% by mass or more and 60% by mass or less of alumina and 40% by mass or more and 65% by mass or less of a conductive compound, Containing at least one selected from carbides, nitrides and carbonitrides of tungsten, and having a maximum crystal grain size of 4 ⁇ m or less (excluding 0 ⁇ m) in the sintered body, A magnetic head substrate is provided.
- the slider in the magnetic head provided with a slider and an electromagnetic transducer, contains 35% by mass or more and 60% by mass or less of alumina, and 40% by mass of a conductive compound. %, And the conductive compound contains at least one selected from carbides, nitrides and carbonitrides of tandasten; A magnetic head is provided having a maximum grain size of 4 ⁇ m or less (except 0 ⁇ m).
- the slider has an air bearing surface and a recess for introducing air.
- the recesses preferably have an arithmetic mean height Ra at the surface of 20 nm or less.
- a magnetic head according to the second aspect of the present invention, a recording medium having a magnetic recording layer for recording and reproducing information by the magnetic head, and the recording medium. And a motor for driving the recording medium.
- the sintered body has an average crystal grain size of: L m or less (with the exception of 0 ⁇ m)
- the alumina has an average crystal grain size of 1 ⁇ m or less (excluding 0 ⁇ m).
- the conductive compound is a carbide of tungsten.
- the conductive compound preferably has, for example, an average crystal grain size of 10 nm (0.01 ⁇ m) or more and 1 ⁇ m or less, and includes particles having a wedge shape.
- the main surface on which the electromagnetic conversion element is formed and the depth of the end surface force of the slider are lmm in a plane parallel to the main surface and the end surface.
- the distribution density of the crystal grains of the conductive composite is 5 ⁇ 10 5 pieces Z mm 2 or more.
- the sintered body has a thermal conductivity of, for example, 30 WZ (m ⁇ k) or more, and a bending strength of, for example, 700 MPa or more.
- carbides, nitrides and carbonitrides of tungsten are contained that contain 35% by mass or more and 60% by mass or more of alumina and 40% by mass or more and 65% by mass or less of the conductive compound. Containing at least one selected from the It can be held. Further, since the maximum grain size force m of the sintered body is set to m or less (but excluding 0 m), the aggregation of the alumina and the conductive compound is suppressed, and the structure is made uniform. The machinability can be improved. Therefore, it is possible to provide a magnetic head excellent in floating characteristics for the purpose of the surface roughness of the machined surface.
- the slider since the slider has the same composition and structure as the magnetic head substrate, the machinability is good while maintaining the conductivity appropriately. Since it can be used, the floating characteristic is excellent.
- the carbide of tungsten is greater than the nitride or carbonitride of tandasten. Since it is inexpensive, it is advantageous in terms of manufacturing cost.
- tungsten carbide is used as the conductive composite, a large resistance between the abrasive grains and the tungsten composite can be secured when the magnetic head substrate or a divided piece thereof is polished. The lapping rate of the magnetic head substrate or its divided pieces can be improved.
- the crystal particles of the conductive compound include particles having a trapezoidal shape
- the conductivity of the crystal phase of alumina can be increased when the magnetic head is manufactured.
- the anchor effect of the crystal particles of the compound it is possible to suppress the precipitation of the crystal particles of alumina and the crystal particles of the conductive composite. Therefore, the substrate for the magnetic head of the present invention is excellent in machinability, and the surface roughness of the machined surface can be made to be a target, so that the floating amount of the magnetic head can be stabilized.
- the magnetic head substrate and the slider of the magnetic head when the average crystal grain size of the conductive compound is 10 nm (0.01 ⁇ m) or more and 1 ⁇ m or less, the magnetic head substrate and the slider The resistance value can be made uniform throughout, and the volume specific resistance can be made 1 ⁇ 'cm or less.
- the plane parallel to the main surface or the end surface in the area from the main surface or the end surface where the electromagnetic conversion element is formed is lmm. If the distribution density of the crystal particles of the conductive composite in this case is 5 ⁇ 10 5 and Z mm 2 or more, the structure is The machinability can be further improved because Also, while maintaining the conductivity properly, the charged area at the end face of the slider is reduced (dispersed), so that the generation of static electricity can be suppressed. Furthermore, if the distribution density is 5 ⁇ 10 5 pieces Z mm 2 or more, the heat dissipation of the crystal particles of the conductive composite is good, so that the heat dissipation can be enhanced as a whole of the sintered body.
- the thermal conductivity is 30%.
- the heat generated from the coil curl of the electromagnetic conversion element in the magnetic head can be dissipated quickly, so that the recording stored in the recording medium is prevented from being destroyed by the heat U can do.
- the bending strength is 700
- microcracks can be appropriately prevented, and as a result, it is possible to suppress the shedding of alumina and conductive composites, and therefore, it has good CSS (contact 'start' top) characteristics. A magnetic head can be obtained.
- the arithmetic average height Ra of the surface of the recess in the slider is 2
- the thickness is less than O nm (except for O nm), the smoothness of the concave portion is improved, so that the floating characteristics can be stabilized.
- the floating characteristics of the magnetic head are stable, even if the slider is miniaturized, the floating amount can be kept constant. Information can be recorded and reproduced accurately over a long period of time.
- FIG. 1 is a plan view showing an example of a recording medium drive device according to the present invention.
- FIG. 2 is a cross-sectional view taken along line II-II in FIG.
- FIG. 3 is a cross-sectional view taken along the line III-III in FIG.
- FIG. 4 is an overall perspective view showing an example of a magnetic head according to the present invention.
- FIG. 5 is a schematic view showing the structure of the slider of the magnetic head and the substrate for the magnetic head according to the present invention.
- FIG. 6 is a schematic view of crystal particles of a wedge-shaped conductive compound.
- FIG. 7A is a perspective view for explaining a manufacturing process of a magnetic head substrate
- FIG. FIG. 7 is a perspective view of a collective substrate for describing a process of forming an electromagnetic transducer on a substrate for a magnetic head.
- FIGS. 8A and 8B are perspective views for explaining a process for cutting a magnetic head substrate to obtain a strip.
- FIG. 9 is a perspective view showing a schematic configuration of a lapping apparatus used for polishing a short strip.
- FIG. 10 is a front view showing a part of the lapping apparatus shown in FIG. 9 in cross section.
- FIG. 11 It is a perspective view for demonstrating the process of forming a recessed part in a short strip piece.
- FIG. 12 It is a perspective view for demonstrating the process of cut
- FIG. 13 is a perspective view showing a state in which divided pieces of a magnetic head substrate are arranged on a lapping jig in the lapping apparatus shown in FIG.
- the disk drive 1 shown in FIGS. 1 to 3 corresponds to an example of a recording medium drive device, and a magnetic head 2 and magnetic disks 3A, 3B, and The rotary drive mechanism 4 is accommodated.
- the magnetic head 2 is for accessing an arbitrary track, and performing recording and reproduction of information.
- the magnetic head 2 is supported by the actuator 5 via a suspension arm 50, and moves on the magnetic disks 3A and 3B in a noncontact manner. More specifically, the magnetic head 2 is rotatable in the radial direction of the magnetic disks 3A and 3B with the actuator 5 as a center, and is reciprocable in the vertical direction.
- the magnetic head 2 includes an electromagnetic transducer 20 and a slider 21.
- the electromagnetic conversion element 20 exerts a magnetoresistive effect, and for example, an MR (Magnetro Resistive) element “hereinafter referred to as“ MR element ”), GMR (Giant Magnetro) Resistive) element
- MR element Magnetic Reistive
- GMR element GMR (Giant Magnetro) Resistive
- TMR element TMR (Tunnel Magnetro Resistive) element
- the slider 21 is to be a base material of the magnetic head 2 and has an air bearing surface 22 and a recess 23.
- the air bearing surface 22 is a surface facing the magnetic disk 3 and is formed as a mirror surface.
- the recess 23 functions as a flow path for passing air for levitating the magnetic head.
- the recess 23 is formed to a target depth and shape by ion milling force or reactive ion etching, and the arithmetic average height Ra on the surface is, for example, 20 nm or less (except for Onm). . If the recess 23 is formed to such a surface roughness, the smoothness of the recess 23 is improved and the flow of air can be appropriately controlled, so that the floating characteristics of the magnetic head 2 can be stabilized.
- the slider 21 is made of a sintered body 6 containing 35% by mass or more and 60% by mass or less of alumina and 40% by mass or more and 65% by mass or less of the conductive composite. .
- the ratio of alumina and conductive compound in the sintered body 6 (slider 21) is obtained by ICP (Inductivity Coupled Plasma) emission analysis to determine the ratio of aluminum and tungsten, and aluminum is converted to an oxide by weight, and tungsten Can be determined in terms of the weight of carbide, nitride or carbonitride according to the type of the conductive compound.
- the sintered body 6 contains crystal particles 60 of alumina and crystal particles 61 of conductive complex, and has a maximum crystal grain size force m or less (except 0 m), preferably 1 ⁇ m or less It is assumed.
- a slider 21 can prevent aggregation of the crystal particles 60 of alumina and the crystal particles 61 of the conductive composite, so that the structure can be made uniform, so the surface roughness can be reduced. While improving the uniformity of the tissue, the proper conductivity is maintained.
- the crystal particle 60 of alumina has, for example, an average crystal grain size of 1 ⁇ m or less (excluding m).
- the crystal grains 61 of the conductive composite are at least one compound selected from carbides, nitrides and carbonitrides of tungsten, preferably tungsten carbide. If a carbide of tungsten is used as the conductive composite, the carbide of tungsten is less expensive than the nitride or carbonitride of tungsten, which is advantageous in terms of manufacturing cost.
- the crystal particles 61 of the conductive compound have, for example, an average crystal grain size of 10 m m (0.01 111) or more and 1111 or less.
- the maximum crystal grain size and average crystal grain size of the alumina crystal particle 60 and the conductive compound crystal particle 61 can be determined, for example, by using a scanning electron microscope (SEM) for the end face 24 of the slider 21 or the target cross section.
- SEM scanning electron microscope
- An image in the range of 5 ⁇ 8 ⁇ m to 20 ⁇ 32 ⁇ m taken using a magnification appropriately selected from 3250 to 13000 times the magnification according to the size of the maximum grain size and the average grain size Can be calculated by analysis using image analysis software (Image-Pro Plus).
- the crystal particles 61 of the conductive compound preferably include particles having a wedge shape. If the crystal particle 61 of the conductive compound contains a wedge-shaped particle! /, The anchoring effect of the crystal particle 61 of the conductive compound on the crystal particle 60 of alumina causes the alumina and the conductivity to be reduced. Both of the crystal particles 60 and 61 of the mixture are disaggregated.
- the end face 24 of the slider 21 on the side of the electromagnetic conversion element 20 or the mirror surface obtained by polishing the area of lmm or less from the end face 24 is observed with a scanning electron microscope (SEM) or the like.
- SEM scanning electron microscope
- FIG. 6 it is a particle having one or more corners having a crossing angle repulsion of less than S 90 ° formed by the contour line of the crystal particle 61 of the conductive composite.
- the smallest angle of intersection, ⁇ is preferably located vertically to the air bearing surface 22 (see FIG. 4) of the magnetic head 2 because the anchor effect is obtained.
- the slider 21 has crystal particles of the conductive compound in a plane 25 parallel to the end face 24 in a region where the depth D from the end face 24 on the electromagnetic conversion element 20 side is up to 1 mm.
- the distribution density of 61 (see FIG. 5 and FIG. 6) is preferably 5 ⁇ 10 5 Zmm 2 or more.
- the distribution density of the crystal particles 61 of the conductive composite is more preferably 1 ⁇ 10 6 Z mm 2 or more.
- the distribution density of the crystal grains 61 of the conductive compound in the plane 25 with the depth D from the end face 24 to 1 mm is 5 ⁇ 10 5 pieces Z mm 2 or more, the conduction is more appropriately conducted.
- the electrical property can be maintained, and the generation of static electricity can be suppressed because the withstand voltage area at the end face 24 is reduced (dispersed).
- the distribution density is 5 ⁇ 10 5 pieces or more and Z mm 2 or more, the heat dissipation property of the sintered body 6 can be enhanced as the heat dissipation property of the crystal particle 61 of the conductive composite is good. it can.
- the area where the distribution density is to be measured is a plane 25 parallel to the end face 24 in the area where the depth D from the end face 24 to 1 mm is the heat dissipation force at the end face 24 This is to affect the destruction of the recording of the disks 3A and 3B.
- the measurement plane of the distribution density may be this end face 24 or a cross section as long as the depth D from the end face 24 is a region up to 1 mm.
- the measurement range of the distribution density is preferably 20 m ⁇ 20 / z m on the measurement surface. Within this range, the dispersion of the crystal particles 61 of the conductive compound can be sufficiently confirmed.
- the distribution density of 5 ⁇ 10 5 Z mm 2 or more means that 200 or more conductive compound particles 2 exist, for example, in a range of 20 ⁇ m ⁇ 20 ⁇ m at the end face 24 or the target cross section.
- the condition can be determined from an image at a magnification of 7000x to 13000x taken with a scanning electron microscope.
- the slider 21 further has a thermal conductivity of, for example, 30 WZ (m * k) or more, and a bending strength of, for example, 700 MPa or more.
- the thermal conductivity is set to 30 WZ (m'k) or more, the heat generated from the coil formed in the magnetic head 2 can be quickly dissipated, so the recording stored in the magnetic disks 3A and 3B Can be prevented from being destroyed by heat.
- the bending strength is set to 700 MPa or more, microcracks can be prevented, so it is possible to suppress the dropping of alumina and the conductive composite and magnetic properties having good CSS (contact 'start' stop) characteristics. You can get a head.
- the thermal conductivity of the sintered body 6 forming the slider 21 conforms to JIS R 1611—1997.
- the bending strength can be evaluated by three-point bending strength in accordance with JIS R 1601-1995.
- the magnetic disks 3A and 3B shown in FIGS. 1 to 3 correspond to an example of a recording medium, and are provided with a magnetic recording layer (not shown). These magnetic disks 3A, 3B are formed in a disk shape having through holes 3 OA, 30B.
- the rotation drive mechanism 4 is for rotating the magnetic disk 3 and includes a motor 40 and a rotation shaft 41.
- the motor 40 is for applying a rotational force to the rotating shaft 41 and is fixed to the bottom wall 11 of the case 10.
- the rotating shaft 41 is rotated by the motor 40 and is for supporting the magnetic disks 3A and 3B.
- the hub 42 is fixed to the rotating shaft 41.
- the knob 42 rotates with the rotation shaft 41 and has an insertion portion 43 and a flange portion 44.
- the magnetic disks 3A, 3B are stacked on the flange portion 44 via the spacers 45, 46, 47 in a state where the insertion portion 43 is inserted into the through holes 30A, 30B.
- the magnetic disks 3A and 3B are fixed to the hub 41 and then to the rotating shaft 40 by fixing the clamp 49 to the spacer 47 with a screw 48.
- the rotation mechanism 4 as described above, by rotating the rotating shaft 41 by the motor 40, the hub 42 and thus the magnetic disks 3A and 3B are rotated.
- a disk-shaped magnetic head substrate 7 is formed.
- the magnetic head substrate 7 is manufactured by pressure sintering using granules obtained by mixing and granulating the material powder.
- the material powder those containing 35 mass% or more and 60 mass% or less of alumina powder and 40 mass% or more and 65 mass% or less of the conductive composite are used.
- the material powder in order to promote sintering and make the sintered body more compact, a small amount of Yb O, Y O, and MgO is used.
- the mixing of the material powders is carried out using, for example, a ball mill, a vibrating mill, a colloid mill, an attritor, or a high speed mixer.
- the alumina powder for example, one having an average particle diameter of 0.3 ⁇ m or more and 0.7 ⁇ m or less is used. Alumina powder having an average particle size of not less than 0.13 and not more than 0. 1 is used. The reason is that if the average particle size of the alumina powder exceeds 0.7 m, the densification of the sintered body becomes insufficient and the strength becomes insufficient, and if it is less than 0.3 m, the formability deteriorates or It is difficult to control the sintering immediately. Therefore, by using an alumina powder having an average particle diameter of 0.3 m or more and 0.7 m or less, the densification of the sintered body is promoted, and the strength necessary for the magnetic head substrate 7 is easily made. Can be obtained. In particular, by using an alumina powder having an average particle diameter of not less than 0.55 111 and not more than 0.5 / zm, an average particle diameter of crystal particles of alumina can be reduced to not more than 1.0 m.
- the conductive compound at least one of carbides, nitrides and carbonitrides of tungsten (W) having an average particle diameter of lO nm or more and 800 nm or less is used, and among them, nitride tungsten is particularly preferable. It is preferable to use tungsten carbide, which is less expensive than tungsten carbide or carbonitride. This would be advantageous in terms of manufacturing cost.
- the conductive compound having an average particle size of 1 O nm to 800 nm is that if the average particle size is less than 1 O nm, the aggregation of the powder of the conductive compound particles is too strong to easily form an aggregate.
- the sinterability at low temperatures tends to deteriorate. Therefore, no aggregates are formed and the average crystal grain size of the conductive compound is made lO nm or more and 1 ⁇ m or less by using an average particle diameter of 10 nm or more and 800 nm or less as the powder of the conductive compound particles. It is possible to obtain a magnetic head substrate 7 which is excellent in sinterability at low temperatures.
- the average particle diameter of the alumina powder and the powder of the conductive compound can be measured by a liquid phase sedimentation method, a centrifugal sedimentation light transmission method, a laser diffraction scattering method, a laser Doppler method or the like.
- Granulation into granules is carried out by adding a forming aid such as a binder and a dispersing agent to a mixture of material powders and uniformly mixing the mixture, and then using a rolling granulator, a spray dryer, a compression granulator, etc. It can be carried out using various granulators of
- Pressure sintering is performed in a reducing atmosphere after the obtained granules are formed into a desired shape by a forming means to obtain a formed body.
- the forming is performed by known means such as dry pressure forming and cold isostatic pressing.
- the reducing atmosphere is achieved, for example, by argon, helium, neon, nitrogen, vacuum.
- the pressure is preferably set to 30 MPa or more. That Thus, the densification of the sintered body is promoted, and the strength required for the magnetic head substrate 7, for example, the bending strength can be made 700 MPa or more. If the bending strength of the magnetic head substrate 7 can be made 700 MPa or more, the occurrence of microcracks can be appropriately prevented.
- the magnetic head substrate 7 since it is possible to suppress the dropping of alumina particles and conductive compound particles, it is possible to provide a magnetic head having good CSS (contact'start'stop) characteristics.
- the bending strength can be evaluated by three-point bending strength in accordance with JIS R 1601-1995.
- the sintering temperature is, for example, not less than 1400 ° C. and not more than 1700 ° C. This is because if the sintering temperature is less than 1400 ° C., the material powder can not be sintered sufficiently, and if it exceeds 1700 ° C., the particles of the conductive compound aggregate immediately after aggregation of the particles of the conductive compound. It is because it can not fully exhibit the functions originally provided.
- a shielding material containing a carbonaceous material around the above-mentioned molded body and to perform pressure sintering.
- the conductive compound particles can be prevented from being denatured into oxide particles, and a magnetic head substrate 7 having excellent mechanical properties can be obtained.
- the magnetic head substrate 7 formed in this manner contains 35% by mass or more and 60% by mass or less of alumina (crystal particles 60), and 40 of the conductive compound (crystal particles 61). In addition to being contained by mass% or more and 65 mass% or less, it becomes a sintered body 6 having a maximum crystal grain diameter force m or less (excluding 0 m).
- a sintered body substrate 7 for a magnetic head
- the content of the conductive compound (crystal particle 61) which does not reduce the removal rate of C.sub.2 is 65% by mass or less, it is possible to properly maintain the sliding characteristics without damaging the surface quality.
- the ratio of the content of force impurities which indicates that the total of alumina and conductive composite particles in the sintered body 6 (substrate 7 for magnetic head) is 100% by mass, to not more than 0.5% by mass May contain!
- the ratio of alumina and conductive composite particles in the sintered body 6 is the same as in the case of the slider 21; alumina by the ICP (Inductivity Coupled Plasma) emission analysis method It can be determined based on the ratio of tungsten.
- the sintered body 6 (substrate 7 for magnetic head) is not limited to the particle diameter of the material powder, the sintering conditions (sintering temperature and sintering
- the average crystal grain size of the crystal particles 61 of the conductive compound is, for example, 10 nm (0.01 ⁇ m) or more and 1 ⁇ m or less by appropriately adjusting the consolidation pressure), and the main surface on which the electromagnetic conversion element is formed.
- the distribution density in the plane 71 (see FIG. 7) parallel to the major surface 70 in the region up to 1 mm in depth is 5 ⁇ 10 5 pieces Z mm 2 or more.
- the resistance value is uniformly made over the entire magnetic head substrate 7.
- the volume resistivity can be reduced to 1 ⁇ 'cm or less.
- the distribution density of the crystal particles 61 of the conductive composite is set to 5 ⁇ 10 5 pieces Z mm 2 or more, the machinability can be made favorable while maintaining the conductivity. And heat dissipation can be enhanced.
- the definition and measurement method of the distribution density of the crystal particles 61 of the conductive compound are the same as in the case of the slider 21.
- the crystal particles 61 of the conductive compound are aggregated to some extent to form a part of the crystal particles 61 of the conductive compound in a wedge shape.
- the definition of the wedge shape is the same as that described for the slider 21 with reference to FIG.
- the anchor effect of the crystal particles 61 of the conductive composite on the alumina crystal particles 60 causes the crystals of alumina to be crystallized.
- the particles 60 and the conductive composite particles 61 fall apart. Therefore, the substrate 7 for the magnetic head is excellent in machinability, and the surface roughness of the machined surface can be made to be a target, so that it is possible to provide the magnetic head 2 with stable floating characteristics.
- the thermal conductivity of the sintered body can be made, for example, 30 WZ (m'k) or more.
- the slider 21 magnetic head 2 obtained from the magnetic head substrate 7 has excellent thermal conductivity. Therefore, since the heat generated from the coil (not shown) of the electromagnetic conversion element 20 in the magnetic head 2 can be released quickly, in the magnetic head substrate 7, the recording stored in the recording medium is destroyed by the heat. It is possible to provide a magnetic head 2 capable of suppressing
- the thermal conductivity can be measured in accordance with JIS R 1611-1997.
- FIG. 7B after an underlayer film of amorphous alumina force is formed on the magnetic head substrate 7 by bias sputtering on the magnetic head substrate 7 in advance.
- a plurality of electromagnetic conversion elements 80 are fabricated at once to form a collective substrate 8.
- the plurality of electromagnetic transducers 80 are formed on the magnetic head substrate 7 by forming, for example, a gap film, a protective film, upper and lower magnetic pole films, a coil film, and an insulating film, using semiconductor integration technology.
- the gap film and the protective film are formed as an alumina sputtered film, for example, by bias sputtering.
- the upper and lower magnetic pole films and the coil film are formed by plating, for example.
- the upper and lower magnetic pole films are made of, for example, a Ni-Fe alloy, and the coil film is made of, for example, copper.
- the insulating film is for maintaining insulation between the magnetic pole film and the coil and between the coils, and is formed, for example, by photolithography using a thermosetting resin having insulation.
- the collective substrate 8 is cut to obtain strip pieces 81.
- a first cutting process for cutting the collective substrate 8 into a square shown in FIG. 8A, and a second cutting process for cutting the strip 81 into one unit of a row in which the electromagnetic conversion elements 80 shown in FIG. 8B are arranged. Includes cutting and cutting.
- the first and second cutting processes are performed using, for example, a diamond cutter.
- the lapping apparatus 9 is provided with a lapping machine 90, a lapping jig 91 and a container 92.
- the lapping machine 90 is rotated by a drive unit (not shown), and is made of, for example, tin and has a flatness of 10 / z m or less and a Vickers hardness (H 2) of 78 MPa.
- This latching board 90 has a spiral groove 93.
- the groove 93 has a rectangular cross section, and the pitch Pt is set to, for example, 0.1 to 0.5 mm.
- the wrap jig 91 is for holding the short strip pieces 81, and is formed in a disk shape.
- the lap jig 91 is vertically reciprocated by an actuator (not shown), and is configured to press the held strip 81 against the lap 90 with a predetermined pressure.
- the container 92 holds the polishing liquid 94 supplied to the lapping machine 90.
- Polishing solution 94 For example, it is possible to use a slurry having a concentration of 0.1 to 1. OgZL containing abrasive particles and a pH of 7.5 to 8.5. As abrasive grains, for example, diamond granules having an average particle size of 0.05-0.15 m can be used.
- a recess 83 is formed on the polished surface 82 of the short strip 81.
- the recessed portion 83 functions as a flow path (recessed portion 23) for passing air for floating the magnetic head 2 (see FIG. 4), and a portion of the polishing surface 82 which is not removed but remains as a mirror surface is
- the air bearing surface 22 (see FIG. 4) is made to face the magnetic recording medium in the head 2.
- the recess 83 is formed to have a target shape, depth and surface roughness by, for example, ion milling or reactive ion etching. Arithmetic mean roughness Ra on the surface of the recess 83 is, for example, 20 nm or less (excluding O nm).
- the smoothness of the recess 23 (see FIG. 4) in the magnetic head 2 is improved, and the air flow can be properly controlled, so the floating characteristics of the magnetic head 2 are stabilized.
- test pieces different in composition and tissue condition were used to study the influence of the composition and tissue condition on mechanical properties.
- the test piece forms a compact using a slurry containing a material powder prepared to a target composition, and then compacts this compact under pressure to form a magnetic head substrate, and cuts the magnetic head substrate. It produced by doing.
- alumina As the material powder, alumina, a conductive compound and Yb O are used, and these material powders are used.
- the dispersant was added to
- the alumina and the conductive composite in the sintered body are selected.
- the content of 2 3 was 0.2 mass%.
- the formed body was formed into granules by injecting the slurry into a spray dryer to form granules, and then spraying 10% of ion-exchanged water onto granules to form a binder, followed by dry pressing.
- the pressure sintering was carried out in an argon atmosphere by placing the compact in a mold (diameter 127 mm, depth 2 mm).
- the sintering temperature is as shown in Table 1 below.
- test pieces were cut into a plate of 10 mm ⁇ 10 mm ⁇ 2 mm and a plate of 20 mm ⁇ 50 mm ⁇ I. 2 mm by cutting the magnetic head substrate.
- the texture state of the test piece was observed as the average crystal grain size of each of alumina and the conductive compound, the maximum crystal grain size of the test piece, and the average crystal grain size.
- the maximum crystal grain size and the average crystal grain size are photographed using a scanning electron microscope (SEM) by selecting an appropriate magnification from 3250 to 13000 times according to the size of the maximum crystal grain size and the average crystal grain size.
- SEM scanning electron microscope
- the image in the range of 5 ⁇ m 8 ⁇ -20; ⁇ 32; ⁇ was calculated by analyzing using an image analysis software (Image-Pro Plus). Table 1 shows the average grain size of each of the alumina and the conductive composite, the maximum grain size of the test piece, and the calculation result of the average grain size.
- the composition of the test piece was calculated as the weight ratio of alumina to the conductive composite.
- an IC P (Inductivity Coupled Plasma) emission analyzer manufactured by Seiko Instruments Inc., SPS 12
- the ratio of aluminum and tungsten was determined using OOVR).
- OOVR Integrated Multi-Respray Detection-S-Oxide
- tungsten it is converted to the weight of carbide, nitride or carbonitride depending on the kind of conductive alloy, and their ratio (% By weight) was calculated.
- the calculation results of the weight ratio are shown in Table 1.
- the mechanical properties are evaluated as lapping rate, surface roughness of concave portion, and Vickers hardness.
- the lapping rate was evaluated as a polishing amount per unit time using a lapping apparatus 9 (lapping master SFT 9 ′ ′ type) shown in FIG. 9 and FIG.
- a slurry of pH 8.1 was used in which diamond globules having a diameter of 0.1 m were dispersed at a concentration of 0.5 g ZL, and the lapping machine 90 had a flatness of 10 m or less and a Vickers hardness (H) of 7 8 MPa,
- the pitch Pt of the grooves 95 was made of tin 0.3 mm, and the rotational speed of the lapping machine 90 was set to 0.65 mZ seconds as the peripheral speed, as shown in FIG.
- the lapping rate was determined by the thickness (t) of the test piece 95 before wrapping and the wrapping
- the thickness (t.sub.2) of the later test piece 95 was measured using a dial gauge, and the difference (t.sub.b.sub.at) was determined by dividing it by the time required for the lap force.
- the surface roughness of the recesses was measured according to JIS B 0601-2001 using an atomic force microscope as the arithmetic mean height (Ra). However, the evaluation length was 10 m.
- the recesses were formed by using a silicon milling apparatus (“AP-MIED type” manufactured by Nippon Denshi K.K.). Ion milling was performed on a 20 mm ⁇ 50 mm ⁇ 1.2 mm test piece using Ar + ions at an acceleration voltage of 3 kV / 30 mA, a collision angle of 35 degrees, and an ion milling depth of 0.2 m.
- the alumina contains 35 mass% or more and 60 mass% or less, and the conductive compound 40 mass% or more and 65 mass% or less, and the largest crystal grain of the sintered body (test piece)
- the sample of the present invention (No. 2, 4, 6, 8, 10 12, 14 19, 22, 24, 27, 29, 34, 36) having a diameter of 4 m or less has a lapping rate of not less than 0. 064 ⁇ mZ min
- the arithmetic mean height Ra of recesses after ion milling is 22 nm or less, the Vickers hardness is 19.2 GPa or more, and the dispersion of the structure of alumina and conductive compound after ion milling is very high. It was possible to obtain a highly accurate surface.
- the samples having an average crystal grain size of 1 m or less of the sintered body (test piece) excluding No. 24 have the arithmetic average height Ra of the recess after ion milling Was able to obtain an even more accurate surface of 21 nm or less.
- the average crystal grain size of conductive compound particles excluding No. 6 is 10 nm (0.01 ⁇ m). m) In all the samples made 1 ⁇ m or less, the arithmetic average height Ra after ion milling was able to obtain an even more accurate surface of 20 nm or less.
- tungsten carbide as a conductive composite No. 2, 4 to 6, 8, 10 to 12, 14 to 19, 22, 24, 36 have resistance to diamond particles compared to other conductive composites (WN, WCN) It was found that the lapping rate was higher than 0.993 ⁇ m Zmin.
- sample No. 1 since the average particle diameter of the alumina powder was 0.3 ⁇ m or less, the dispersibility of the alumina powder itself was deteriorated, and the elastic recovery of the molded body was also increased. Result It was not possible to sinter well. Since sample No. 7 had a pressure sintering temperature of less than 1400 ° C., sample No. 21 could not be sintered sufficiently because it used pressureless sintering, and all evaluations should be conducted. I was able to
- the alumina 60 wt% or more 35% by mass or less, the sample containing no conductive compound in 40 mass% or more 65 wt 0/0 or less (No. 9, 13, 26, 30, 31, 35)
- the lapping rate was as low as 0. 045 ⁇ m Zmin, and the machinability of the sample with an arithmetic mean height Ra of around 25 mm after ion milling was reduced.
- Test pieces were produced in the same manner as in Example 1. However, for each of the alumina and conductive composite particles in the sintered body (test piece), the average grain size and content are adjusted as shown in Table 2, and the sintering temperature is adjusted. The distribution density of conductive compound particles in the test piece was adjusted. Moreover, as a test piece, the plate-like 10 mm x 10 mm x 2 mm and the long shape of 20 mm x 50 mm x 3.5 mm were produced by cutting the sintered body.
- the distribution density was determined by subjecting the test piece to lapping under the same conditions as in Example 1, and using a scanning electron microscope, the conductive composite particles in the range of 20 m x 20 m of the lapped surface. It was confirmed by counting the number of Magnification of scanning electron microscope is 7000-1300 0x range force An optimal magnification was selected. In the observation of the scanning electron microscope, the shape of the conductive composite particles was simultaneously confirmed.
- the volume resistivity was measured in accordance with JIS C 2141-1992.
- the lapping rate was measured in the same manner as in Example 1.
- the maximum chipping amount was also measured for the groove surface force when a groove was formed using a test piece with a slicer (“SPG 25 N-13 K type” manufactured by Fujikoshi Co., Ltd.).
- As test pieces ten pieces each having a length of 2 O mm ⁇ 50 mm ⁇ 3.5 mm were prepared for each sample.
- As a diamond blade in the slicer SD1200EL-lHZSize (diamond blade size 99 mm wide x 40 mm high x 0. 07 mm thick) was used.
- the grooves were formed at a processing depth of 3.5 mm, a processing pitch of 2 mm, and a processing length of 50 mm as a feed speed of a diamond blade of 220 mm Zmin and a rotation speed of 100 rpm.
- the groove surface was photographed at a magnification of 1000 using a metallurgical microscope, and the maximum tibbing amount was calculated by analyzing an image in the range of 60 m ⁇ 80 m.
- the sample having the distribution density of conductive composite particles of 5 ⁇ 10 5 pieces or more and Z mm 2 or more (No. 41 47) has a volume resistivity of 3 X 10 _3 ⁇ 'cm or less and Teigu maximum Chibbingu amount was as follows and the small 11 m.
- the samples (o. 41 to 45) containing particles of a wedge shape as the conductive compound particles were able to further reduce the maximum tibbing amount to 6 m or less.
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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Nanotechnology (AREA)
- Thermal Sciences (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
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Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008505039A JPWO2007105477A1 (ja) | 2006-02-27 | 2007-02-26 | 磁気ヘッド用基板、磁気ヘッドおよび記録媒体駆動装置 |
| US12/280,974 US20090244772A1 (en) | 2006-02-27 | 2007-02-26 | Magnetic head substrate, magnetic head and recording medium driving device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006050968 | 2006-02-27 | ||
| JP2006-050968 | 2006-02-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007105477A1 true WO2007105477A1 (ja) | 2007-09-20 |
Family
ID=38509313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2007/053556 Ceased WO2007105477A1 (ja) | 2006-02-27 | 2007-02-26 | 磁気ヘッド用基板、磁気ヘッドおよび記録媒体駆動装置 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20090244772A1 (ja) |
| JP (1) | JPWO2007105477A1 (ja) |
| CN (1) | CN101432806A (ja) |
| WO (1) | WO2007105477A1 (ja) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5345449B2 (ja) * | 2008-07-01 | 2013-11-20 | 日本碍子株式会社 | 接合構造体及びその製造方法 |
| US8611043B2 (en) | 2011-06-02 | 2013-12-17 | International Business Machines Corporation | Magnetic head having polycrystalline coating |
| US8611044B2 (en) | 2011-06-02 | 2013-12-17 | International Business Machines Corporation | Magnetic head having separate protection for read transducers and write transducers |
| US8837082B2 (en) | 2012-04-27 | 2014-09-16 | International Business Machines Corporation | Magnetic recording head having quilted-type coating |
| US9036297B2 (en) | 2012-08-31 | 2015-05-19 | International Business Machines Corporation | Magnetic recording head having protected reader sensors and near zero recession writer poles |
| US8780496B2 (en) | 2012-09-21 | 2014-07-15 | International Business Machines Corporation | Device such as magnetic head having hardened dielectric portions |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09221352A (ja) * | 1995-11-07 | 1997-08-26 | Ngk Spark Plug Co Ltd | セラミックス焼結体及びセラミックス製金型 |
| JP2000348321A (ja) * | 1999-06-03 | 2000-12-15 | Nec Corp | 磁気ディスク装置,磁気ヘッド,磁気ヘッドの製造方法および磁気ディスク装置の製造方法 |
| JP2002356367A (ja) * | 2001-03-29 | 2002-12-13 | Taiheiyo Cement Corp | 低熱膨張セラミックス及びその製造方法 |
| JP2005272291A (ja) * | 2004-02-26 | 2005-10-06 | Kyocera Corp | 酸化アルミニウム窒化チタニウム系焼結体とこれを用いた磁気ヘッド用基板と超音波モータと動圧軸受およびその製造方法 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4251841A (en) * | 1979-06-01 | 1981-02-17 | International Business Machines Corporation | Magnetic head slider assembly |
| JPH062615B2 (ja) * | 1984-12-29 | 1994-01-12 | ティーディーケイ株式会社 | 磁気ヘツドスライダ材料 |
| JPH0622053B2 (ja) * | 1986-04-23 | 1994-03-23 | 住友特殊金属株式会社 | 基板材料 |
| JPH10212164A (ja) * | 1997-01-24 | 1998-08-11 | Nippon Tungsten Co Ltd | 磁気ヘッド用基板材料 |
| US6067220A (en) * | 1998-04-02 | 2000-05-23 | Pemstar, Inc. | Shunt for protecting a hard file head |
| CN100562506C (zh) * | 2004-11-29 | 2009-11-25 | 京瓷株式会社 | 氧化铝氮化钛类烧结体及其制造方法、磁头用基板、超声波马达、动压力轴承 |
| JP2006286104A (ja) * | 2005-03-31 | 2006-10-19 | Fujitsu Ltd | 磁気ヘッドおよびその製造方法 |
| JP5354901B2 (ja) * | 2005-04-21 | 2013-11-27 | 日立金属株式会社 | 薄膜磁気ヘッド用セラミックス基板材料 |
-
2007
- 2007-02-26 CN CNA200780015301XA patent/CN101432806A/zh active Pending
- 2007-02-26 US US12/280,974 patent/US20090244772A1/en not_active Abandoned
- 2007-02-26 JP JP2008505039A patent/JPWO2007105477A1/ja not_active Withdrawn
- 2007-02-26 WO PCT/JP2007/053556 patent/WO2007105477A1/ja not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09221352A (ja) * | 1995-11-07 | 1997-08-26 | Ngk Spark Plug Co Ltd | セラミックス焼結体及びセラミックス製金型 |
| JP2000348321A (ja) * | 1999-06-03 | 2000-12-15 | Nec Corp | 磁気ディスク装置,磁気ヘッド,磁気ヘッドの製造方法および磁気ディスク装置の製造方法 |
| JP2002356367A (ja) * | 2001-03-29 | 2002-12-13 | Taiheiyo Cement Corp | 低熱膨張セラミックス及びその製造方法 |
| JP2005272291A (ja) * | 2004-02-26 | 2005-10-06 | Kyocera Corp | 酸化アルミニウム窒化チタニウム系焼結体とこれを用いた磁気ヘッド用基板と超音波モータと動圧軸受およびその製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2007105477A1 (ja) | 2009-07-30 |
| CN101432806A (zh) | 2009-05-13 |
| US20090244772A1 (en) | 2009-10-01 |
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