WO2004034382A1 - Cpp構造磁気抵抗効果素子およびヘッドスライダ - Google Patents
Cpp構造磁気抵抗効果素子およびヘッドスライダ Download PDFInfo
- Publication number
- WO2004034382A1 WO2004034382A1 PCT/JP2003/012834 JP0312834W WO2004034382A1 WO 2004034382 A1 WO2004034382 A1 WO 2004034382A1 JP 0312834 W JP0312834 W JP 0312834W WO 2004034382 A1 WO2004034382 A1 WO 2004034382A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- shield layer
- magnetoresistive
- magnetoresistive film
- electrode
- Prior art date
Links
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y25/00—Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
-
- 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
- G11B5/3109—Details
- G11B5/3116—Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks
-
- 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N50/00—Galvanomagnetic devices
- H10N50/10—Magnetoresistive devices
-
- 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
- G11B2005/3996—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 large or giant magnetoresistive effects [GMR], e.g. as generated in spin-valve [SV] devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F10/00—Thin magnetic films, e.g. of one-domain structure
- H01F10/32—Spin-exchange-coupled multilayers, e.g. nanostructured superlattices
- H01F10/324—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer
- H01F10/3268—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer the exchange coupling being asymmetric, e.g. by use of additional pinning, by using antiferromagnetic or ferromagnetic coupling interface, i.e. so-called spin-valve [SV] structure, e.g. NiFe/Cu/NiFe/FeMn
Definitions
- the present invention relates to a magnetoresistive effect element using a magnetoresistive effect film such as a spin valve film or a tunnel junction film, and more particularly, to a magnetoresistive effect film laminated on a surface of an arbitrary base layer and orthogonal to the surface of the base layer
- the present invention relates to a magnetoresistive element having a CPP (Cu rent Pe rp endicular to to t he PIane) structure through which a sense current having a vertical component flows.
- CPP Cu rent Pe rp endicular to to t he PIane
- a magnetoresistive film such as a spin valve film is laminated on an arbitrary base layer.
- the spin valve film is sandwiched on the base layer by, for example, a pair of magnetic domain control films.
- a bias magnetic field is established between the magnetic domain control films along one direction.
- the magnetization direction is adjusted in the free ferromagnetic layer (fr eel aye r) in the spin valve film based on such a bias magnetic field.
- the magnetic domain control film is generally composed of a hard magnetic material, that is, a hard film.
- the intensity of the bias magnetic field is determined based on, for example, the thickness of the magnetic domain control film and the residual magnetization intensity.
- the size of the magnetoresistive film can be remarkably reduced as compared with the known CIP (Cu rrent In-the-Plane) structure magnetoresistive element. .
- the distance between the magnetic domain control films becomes significantly smaller.
- an excessive bias magnetic field acts on the free ferromagnetic layer in the magnetoresistive film.
- An increase in the bias magnetic field hinders rotation in the magnetic direction in the free ferromagnetic layer.
- Patent Document 1
- the present invention has been made in view of the above circumstances, and it is possible to relatively easily control the direction of the free side magnetic layer in the magnetoresistive film according to the size of the magnetoresistive film.
- An object of the present invention is to provide a CPP structure magnetoresistive element.
- a lower electrode defining a reference plane intersecting the medium facing surface, an upper electrode facing the reference plane at a predetermined interval, an upper electrode and a lower electrode
- a magnetoresistive film disposed between the side electrodes and extending along the reference plane while being in contact with the lower electrode; and a non-magnetic material extending along the reference plane adjacent to the magnetoresistive effect film.
- a CPP structure magnetoresistive element is provided. In such a CPP structure magnetoresistive element, a current flows between the upper electrode and the lower electrode in a direction perpendicular to the reference plane.
- the present inventor has found that in the CPP structure magnetoresistive element, the magnetic field is sufficiently established in one direction along the medium facing surface based on the current magnetic field.
- the present inventor has found the utility of the current magnetic field in controlling the magnetization direction of the free magnetic layer.
- the current value is set based on the heat generated by the magnetoresistive film.
- a magnetic field of sufficient strength can be established in the free magnetic layer as long as heat generation, that is, the amount of power is kept constant. Therefore, the direction of the free side magnetic layer can be easily controlled irrespective of the reduction of the magnetoresistive film.
- the CPP structure magnetoresistive element has an upper and lower shield layer sandwiching an upper electrode, a lower electrode, a magnetoresistive film and a non-magnetic film along the medium facing surface, and a lower part from the upper shield layer along the medium facing surface.
- the soft magnetic material functions as a so-called shield layer.
- the area of the magnetic field acting on the magnetoresistive film can be reduced.
- the resolution of magnetic information in the so-called track width direction can be increased.
- the CPP structure magnetoresistive element can greatly contribute to further improvement in recording density.
- the soft magnetic material may be connected to one of the upper shield layer and the lower shield layer.
- the upper shield layer may also serve as the upper electrode
- the lower shield layer may serve as the lower electrode.
- a magnetoresistive film extending along a reference plane intersecting the medium facing surface, an upper shield layer and a lower shield layer sandwiching the magnetoresistive film along the medium facing surface, And a soft magnetic material extending in parallel from the upper shield layer to the lower shield layer along the surface and in parallel with the magnetoresistive effect film.
- the soft magnetic material functions as a so-called shield layer.
- the region of the magnetic field acting on the magnetoresistive film can be narrowed.
- the resolution of magnetic information can be enhanced in the so-called track width direction.
- the CPP structure magnetoresistive element can greatly contribute to further improvement in recording density.
- the soft magnetic material may be connected to one of the upper shield layer and the lower shield layer.
- the upper shield layer may also serve as the upper electrode
- the lower shield layer may serve as the lower electrode.
- the above-described CPP structure magnetoresistive element or magnetoresistive element can be used by being incorporated in, for example, a head slider.
- the head slider is used by being incorporated in a magnetic recording medium drive such as a hard disk drive.
- FIG. 1 is a plan view schematically showing a specific example of a magnetic recording medium drive, that is, a structure of a hard disk drive (HDD).
- a magnetic recording medium drive that is, a structure of a hard disk drive (HDD).
- HDD hard disk drive
- FIG. 2 is an enlarged perspective view schematically showing the structure of a flying head slider according to one specific example. It is.
- FIG. 3 is a front view schematically showing a read / write head observed on the air bearing surface.
- FIG. 4 is an enlarged front view schematically showing the structure of the CPP structure magnetoresistive (MR) read element according to the first embodiment of the present invention.
- MR magnetoresistive
- FIG. 5 is a schematic diagram schematically showing a state of a magnetic field generated in the free ferromagnetic layer based on a current.
- FIG. 6 is a schematic diagram schematically showing the magnetization direction controlled in the free ferromagnetic layer based on the current.
- Figures 7A and 7B schematically show how the magnetization changes in the free-side ferromagnetic layer according to the direction of the recording magnetic field when the magnetic field is controlled in the free-side ferromagnetic layer based on the current.
- FIG. 7A schematically show how the magnetization changes in the free-side ferromagnetic layer according to the direction of the recording magnetic field when the magnetic field is controlled in the free-side ferromagnetic layer based on the current.
- FIG. 8 is a schematic diagram schematically showing a direction of magnetization controlled in the free ferromagnetic layer based on the current and the magnetic domain control film.
- FIGS. 9A and 9B show that when the magnetization is controlled in the free-side ferromagnetic layer based on the current and the domain control film, the magnetic field changes in the free-side ferromagnetic layer in accordance with the direction of the recording magnetic field. It is a schematic diagram which roughly shows the state of a dagger.
- FIG. 10 is a graph showing the intensity distribution of the magnetic field established in the free ferromagnetic layer with a 0.32 m square magnetoresistive film.
- FIG. 11 is a graph showing the intensity distribution of a magnetic field established in the free ferromagnetic layer by a 0.16 m square magnetoresistive film.
- FIG. 12 is a graph showing the intensity distribution of the magnetic field established in the free ferromagnetic layer with a 0.08 m square magnetoresistive film.
- FIG. 13 is an enlarged partial cross-sectional view of a substrate schematically showing a state of a resist film formed on the magnetoresistive film when shaping the magnetoresistive film.
- FIG. 14 is an enlarged partial cross-sectional view of the substrate schematically showing a step of shaping the magnetoresistive film and the upper electrode.
- FIG. 15 is an enlarged partial cross-sectional view of a substrate schematically showing a step of forming a nonmagnetic film.
- FIG. 16 is an enlarged partial cross-sectional view of the substrate schematically showing a step of exposing the surface of the upper electrode.
- FIG. 17 is a front view corresponding to FIG. 3 and schematically showing the structure of a CPP structure magnetoresistive effect (MR) read element according to the second embodiment of the present invention.
- MR magnetoresistive effect
- FIG. 18 is an enlarged partial cross-sectional view of the substrate schematically showing a step of forming a base nonmagnetic film and a soft magnetic material film.
- FIG. 19 is an enlarged partial sectional view of the substrate schematically showing a step of shaping the soft magnetic material from the soft magnetic material film.
- FIG. 20 is an enlarged partial cross-sectional view of a substrate schematically showing a step of forming a nonmagnetic film.
- FIG. 21 is an enlarged partial cross-sectional view of the substrate schematically showing a step of exposing the surfaces of the upper electrode and the soft magnetic material.
- FIG. 22 is an enlarged front view corresponding to FIG. 4 and schematically showing a structure of a spin valve film according to another specific example.
- FIG. 23 is an enlarged front view corresponding to FIG. 4 and schematically showing a structure of a tunnel junction film according to a specific example.
- FIG. 1 schematically shows a specific example of a magnetic recording medium drive, that is, an internal structure of a hard disk drive (HDD) 11.
- the HDD 11 includes, for example, a box-shaped casing main body 12 that defines a flat rectangular parallelepiped internal space.
- the accommodation space accommodates one or more magnetic disks 13 as a recording medium.
- the magnetic disk 13 is mounted on a rotating shaft of a spindle motor 14.
- the spindle motor 14 can rotate the magnetic disk 13 at a high speed of, for example, 720 rpm or 100 rpm.
- a lid which is a cover (not shown) for sealing the accommodation space between the housing body 12 and the housing body 12, is connected to the housing body 12.
- the accommodating space further accommodates Head Actuyue 15th.
- the head actuator 15 is rotatably connected to a vertically extending support shaft 16.
- Head The actuators 15 are provided with a plurality of actuators 17 extending in the horizontal direction from the support shaft 16 and attached to the ends of the actuators 17 to move forward from the actuators 17.
- An extended head suspension assembly 18 The actuator arm 17 is installed on each of the front and back surfaces of the magnetic disk 13.
- the head suspension assembly 18 has a load beam 19.
- the load beam 19 is connected to the front end of the arm 17 in a so-called flexion area.
- the predetermined bending force acts on the front end of the load beam 19 toward the surface of the magnetic disk 13 by the action of the elastic bending region.
- a floating head slider 21 is supported at the front end of the mouth beam 19.
- the flying head slider 21 is received by a gimbal (not shown) fixed to the load beam 19 so that the attitude can be freely changed.
- a positive pressure that is, a buoyancy and a negative pressure act on the flying head slider 21 by the action of the airflow, as described later.
- the flying head slider 21 can keep flying with relatively high rigidity during the rotation of the magnetic disk 13.
- a power source 22 such as a voice coil motor (VCM) is connected to the actuator arm 17.
- VCM voice coil motor
- the actuator arm 17 can rotate around the support shaft 16.
- the movement of the head suspension assembly 18 is realized based on the rotation of the arm 17 as described above.
- the flying head slider 21 can cross the surface of the magnetic disk 13 in the radial direction. Based on such movement, the flying head slider 21 is positioned at a desired recording track.
- FIG. 2 shows a specific example of the flying head slider 21.
- the flying head slider 21 includes a slider body 23 formed, for example, in a flat rectangular parallelepiped.
- the slider body 23 faces the magnetic disk 13 on the medium facing surface, that is, the flying surface 24.
- the air bearing surface 24 defines a flat base surface, that is, a reference surface. When the magnetic disk 13 rotates, the airflow 2 flows to the flying surface 24 from the front end to the rear end of the slider body 23. 5 works.
- the slider body 2 for example, A 1 2 0 3 - T i C A 1 2 ⁇ 3 (AlTiC) made of the base material 2 3 a, which is laminated on the trailing end surface of the base material 2 3 a (alumina It suffices if it is composed of the film 23b.
- ABS air bearing surfaces
- the airflow 25 generated based on the rotation of the magnetic disk 13 is received by the air bearing surface 24.
- a relatively large positive pressure that is, buoyancy
- a large negative pressure is generated behind the front rail 26, that is, behind the front rail.
- the flying attitude of the flying head slider 21 is established based on the balance between the buoyancy and the negative pressure.
- An electromagnetic transducer that is, a read / write head element 33 is mounted on the slider body 23.
- the read / write head element 33 is embedded in the alumina film 23 b of the slider body 23.
- the read gap and write gap of the read / write head element 33 are exposed by the ABS 29 of the rear rail 27.
- a DLC (diamond-like carbon) protective film which covers the front end of the read / write head 33 may be formed on the surface of the ABS 29. Details of the read / write head element 33 will be described later.
- the form of the flying head slider 21 is not limited to such a form.
- FIG. 3 shows the flying surface 24 in detail.
- the read / write head 33 is a thin-film magnetic head, that is, an inductive write head element 34, and the CPP structure electromagnetic transducer according to the first embodiment of the present invention, that is, the CPP structure magnetoresistance (MR) read element 3. 5 is provided.
- the inductive write head element 34 can write binary information on the magnetic disk 13 using, for example, a magnetic field generated by a conductive coil pattern (not shown).
- the CPP structure MR read element 35 detects binary information based on resistance that changes according to the magnetic field acting from the magnetic disk 13. Can be issued.
- the inductive writing head element 34 and the CPP structure MR reading element 35 are composed of an Al 2 ⁇ 3 (alumina) film 36 constituting the upper half layer of the above-mentioned alumina film 23 b, that is, an overcoat film; It is sandwiched between the a 1 2 0 3 (alumina) film 3 7 constituting the lower half layer i.e. undercoat film.
- the inductive write head element 34 includes an upper magnetic pole layer 38 that exposes a front end at ABS 29 and a lower magnetic pole layer 39 that similarly exposes a front end at ABS 29.
- the upper and lower magnetic pole layers 38, 39 may be formed by, for example, FeN or NiFe force.
- the upper and lower pole layers 38, 39 cooperate to form a magnetic core of the inductive write head element 34.
- a 1 2 0 3 (alumina) manufactured by a non-magnetic gap layer 4 1 between the upper and lower magnetic pole layers 3 8, 3 9 is interposed.
- the magnetic flux passing between the upper magnetic pole layer 38 and the lower magnetic pole layer 39 leaks from the ABS 29 due to the function of the nonmagnetic gap layer 41.
- the magnetic flux leaking out forms a recording magnetic field (gap magnetic field).
- the CPP structure MR reading element 35 includes an alumina film 37, that is, a lower electrode 42 extending along the surface of the underlying insulating layer.
- the lower electrode 42 may have not only conductivity but also soft magnetism.
- the lower electrode 42 is made of a conductive soft magnetic material such as NiFe, for example, the lower electrode 42 can simultaneously function as a lower shield layer of the CPP structure MR reading element 35. .
- a flattened surface 43 that is, a reference surface, which intersects the air bearing surface 24 at an intersection angle of 90 degrees is defined.
- a magnetoresistive effect (MR) film 44 is laminated with a predetermined contour. The magnetoresistive film 44 extends rearward from the front end exposed at the ABS 29 along the flattened surface 43. In this way, contact, that is, electrical connection is established between the magnetoresistive film 44 and the lower electrode 42. Details of the structure of the magnetoresistive film 44 will be described later.
- An upper electrode 45 is disposed on the magnetoresistive film 44.
- the magnetoresistive film 44 is sandwiched between the upper electrode 45 and the lower electrode 42.
- An upper shield layer 46 is disposed on the upper electrode 45.
- the upper shield layer 46 may have not only soft magnetism but also conductivity. Similarly, the upper electrode 4 5 not only has conductivity, At the same time, soft magnetism may be provided.
- the upper electrode 45 is made of, for example, a conductive soft magnetic material such as NiFe
- the upper electrode 45 can simultaneously function as an upper shield layer of the CPP structure MR reading element 35.
- the distance between the lower shield layer, ie, the lower electrode 42 and the upper electrode 45 determines the resolution of magnetic recording on the magnetic disk 13 in the recording track linear direction.
- a nonmagnetic film 47 spreads adjacent to the magnetoresistive film 44.
- the nonmagnetic film 47 is sandwiched between the lower electrode 42 and the upper shield layer 46.
- the nonmagnetic film 47 may be made of an insulating material such as A 1 2 0 3 and S I_ ⁇ 2. Since the non-magnetic film 47 is thus provided with insulation, even if the upper shield layer 46 is provided with conductivity, an electrical short circuit between the upper shield layer 46 and the lower electrode 42 is prevented. it can.
- FIG. 4 shows an enlarged view of the CPP structure MR read element 35.
- the magnetoresistive film 44 is formed as a so-called spin valve film. That is, in the magnetoresistive film 44, the underlayer 48, the fixed magnetization direction layer (pinning layer) 49, the fixed side ferromagnetic layer (pinning liner) 51, and the conductive nonmagnetic intermediate layer
- the layer 52, the free ferromagnetic layer 53, and the protective cap layer 54 are sequentially stacked.
- the fixed-side ferromagnetic layer 51 and the free-side ferromagnetic layer 53 may be made of a soft magnetic material such as NiFe.
- the fixed magnetization direction layer 49 may be made of an antiferromagnetic material such as IrMn.
- the magnetization of the fixed-side ferromagnetic layer 51 is fixed in one direction by the function of the magnetization direction fixed layer 49.
- the nonmagnetic intermediate layer 52 may be composed of, for example, a Cu layer.
- the CPP structure When reading the magnetic information, the CPP structure
- the magnetoresistive film 44 has a free side in accordance with the direction of the magnetic field acting from the magnetic disk 13.
- the magnet in the ferromagnetic layer 53 rotates.
- the electric resistance of the magnetoresistive film 44 changes greatly. Therefore, when a sense current is supplied from the upper electrode 45 and the lower electrode 42 to the magnetoresistive film 44, the level of the voltage extracted from the upper electrode 45 and the lower electrode 42 changes according to the change in the electric resistance. I do.
- the binary information can be read in response to this level change.
- the present inventors have verified the current magnetic field generated in the free ferromagnetic layer 53 in response to the supply of current.
- the inventor executed magnetic field analysis software on a computer.
- the current flow was set in the direction perpendicular to the magnetoresistive film 4 4.
- a current magnetic field rotating in one direction around its center was established in one horizontal section perpendicular to the current flow.
- the intensity of such a current magnetic field increases with the distance from the center.
- the intensity of the current magnetic field decreases according to the distance from the center.
- the intensity of the current magnetic field increased with the distance from the center when the current flowed uniformly from the vertical direction to the horizontal section.
- the direction of the magnetic field was established along ABS29, as is clear from FIG.
- the present inventor has found that the magnetization is sufficiently established in one direction along the ABS 29 in the CPP structure MR reading element 35 as described above.
- the inventor further observed a magnetic field generated in the free ferromagnetic layer 53.
- the magnetic field analysis software was used again for the observation.
- the effects of the magnetic field of the fixed ferromagnetic layer 51, the static magnetic field, and the exchange interaction were considered.
- the outline of the magnetoresistive film 44 was set to a square of 0.16 xm on each side. As is clear from FIG. 6, it was confirmed that the generation of domain walls was avoided in the free-side ferromagnetic layer 53.
- the magnetic field is sufficiently increased between the case where the recording magnetic field 55 flows into the magnetic disk 13 and the case where the recording magnetic field 56 flows out from the magnetic disk 13. It was confirmed to rotate.
- FIGS. 6 and 7 the direction of magnetization is specified by each arrow.
- the inventor observed a magnetic field generated in the free ferromagnetic layer in the CPP structure MR read element according to the comparative example.
- This CPP structure MR read element incorporates the same magnetoresistive film 44 as described above. However, the magnetoresistive film 44 was sandwiched between the pair of magnetic domain control films along the ABS. A bias magnetic field crossing the free ferromagnetic layer along one direction was formed between the magnetic domain control films. As is clear from Fig. 8, the effect of the bias magnetic field was confirmed in the free ferromagnetic layer.
- the position of the magnetic field was determined based on the distance measured along ABS 29 from one end of the free ferromagnetic layer 53. For example, as shown in FIG. 10, when the magnetoresistive effect film 44 is formed in a square shape with 0.32 sides, the magnetic field intensity is almost uniformly established along the ABS 29 in the CPP structure MR reading element 35. Can be On the other hand, the magnetic field intensity based on the current magnetic field is lower in the range of 0.05 to 0.25 in the CPP structure MR read element according to the comparative example. As is evident from FIG.
- the magnetization direction of the free-side ferromagnetic layer 53 can be controlled more easily than the known magnetic domain control film. . As long as the relationship of [Equation 1] is maintained, the magnetization direction of the free-side ferromagnetic layer 53 can be easily controlled despite the shrinking of the magnetoresistive film 44 Can be done.
- first and second material films 58, 59 are successively laminated on lower electrode 42 on a given substrate, as shown in Fig. 13. Is done.
- the first material film 58 is formed of a laminate having the same structure as the above-described magnetoresistive film 44.
- the second material Ji 59 may be formed of a conductive material such as NiFe, for example.
- a resist film 61 is formed with a predetermined contour.
- An etching process is performed based on the resist film 61.
- an ion milling method may be used for the etching process.
- the first and second material films 58 and 59 are removed around the resist film 61.
- the magnetoresistive film 44 is cut out of the first material film 58.
- the upper electrode 45 is cut out from the second material film 59.
- the surface of the lower electrode 42 may be partially removed around the magnetoresistive film 44 to be removed.
- a step 62 is formed on the lower electrode 42.
- the step 62 is continuous with the outline of the magnetoresistive film 44.
- an insulating non-magnetic film 47 is formed on the lower electrode 42.
- a sputtering method may be used for film formation.
- the magnetoresistance effect film 44 and the upper electrode 45 are buried in the nonmagnetic film 47.
- the non-magnetic film 47 uniformly contacts the periphery of the magnetoresistive film 44 and the upper electrode 45.
- the resist film 61 is removed as shown in FIG. With the removal of the resist film 61, the nonmagnetic film 47 on the resist film 61 is removed. Thus, the upper surface of the upper electrode 45 is exposed between the nonmagnetic films 47.
- FIG. 17 schematically shows an MR read element 35a having a CPP structure according to the second embodiment of the present invention.
- the CPP structure MR read element 35a incorporates a soft magnetic material 63 extending from the upper shield layer 46 to the lower shield layer, ie, the lower electrode 42, along the air bearing surface, that is, the ABS 29.
- the soft magnetic material 63 extends in parallel with the magnetoresistive film 44 along the ABS 29.
- the magnetoresistive film 44 is sandwiched between soft magnetic members 63.
- Each soft magnetic material 6 3 and the magnetoresistive film 4 4 Electrically isolated by the permeable membrane 47.
- the soft magnetic material 63 may contact the upper shield layer 46 as shown in FIG. 17, or may contact the lower shield layer, that is, the lower electrode 42. However, the soft magnetic material 63 cannot contact the upper shield layer 46 and the lower electrode 42 at the same time.
- the same reference numerals are given to the same components as those of the first embodiment.
- the direction of magnetization can be sufficiently controlled in the free ferromagnetic layer 53 based on the function of the current magnetic field, as described above.
- the soft magnetic material 63 functions as a so-called shield layer, the area of the magnetic field acting on the magnetoresistive film 44 from the magnetic disk 13 can be narrowed.
- the resolution of magnetic information in the so-called track width direction can be increased.
- the C P P structure MR read element 35a can greatly contribute to further improvement of the recording density.
- the magnetoresistive film 44 and the upper electrode 45 are formed from the first and second material films 58, 59 under the resist film 61 as described above. Is cut off (see Figures 13 and 14). Thereafter, on the lower electrode 42, an insulating base non-magnetic film 64 and a soft magnetic material film 65 are successively formed. In forming the film, for example, a sputtering method may be used. As shown in FIG. 18, the magnetoresistive film 44 and the upper electrode 45 are covered with a base nonmagnetic film 64 and a soft magnetic material film 65. The underlayer nonmagnetic film 64 is in tight contact with the periphery of the magnetoresistance effect film 44 and the upper electrode 45.
- the resist film 61 is removed. As the resist film 61 is removed, the underlying nonmagnetic film 64 and the soft magnetic material J3 on the resist film 61 are removed. Thus, the upper surface of the upper electrode 45 is exposed. Thereafter, as shown in FIG. 19, a resist film 66 having a predetermined contour is formed on the soft magnetic material film 65 and the upper electrode 45. An etching process is performed based on the resist film 66. For example, an ion milling method may be used for the etching process. The soft magnetic material film 65 is removed around the resist film 66. Thus, the soft magnetic material 63 is cut out from the soft magnetic material film 65.
- the surface of the underlying non-magnetic film 64 may be partially removed around the soft magnetic material 63 to be removed.
- an insulating non-magnetic film 47 is formed on the lower electrode 42.
- the non-magnetic film 47 is uniformly contacted around the soft magnetic body 63.
- the magneto-resistance effect film 44 and the upper electrode 45 are buried in the non-magnetic film 47.
- the resist film 66 is removed as shown in FIG. With the removal of the resist film 66, the nonmagnetic film 47 on the resist film 66 is removed.
- the upper surfaces of the upper electrode 45 and the soft magnetic body 63 are exposed between the non-magnetic films 47. Thereafter, an upper shield layer 46 is formed on the nonmagnetic film 47, the upper electrode 45, and the soft magnetic material 63.
- a so-called multilayer ferri structure may be used for the fixed-side ferromagnetic layer 51, as shown in FIG.
- the fixed-side ferromagnetic layer 51 includes, for example, a pair of CoFeB layers 51a and 51b and a Ru layer 51c sandwiched between the CoFeB layers 51a and 51b. Just fine.
- a PdPtMn layer may be used for the magnetization direction fixed layer 49.
- a so-called tunnel junction magnetoresistance (TMR) film may be used for the magnetoresistance effect film 44.
- TMR tunnel junction magnetoresistance
- a thin-film insulating layer 67 may be incorporated between the fixed-side ferromagnetic layer 51 and the free-side ferromagnetic layer 53 instead of the conductive non-magnetic intermediate layer 52 described above.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Nanotechnology (AREA)
- Manufacturing & Machinery (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Hall/Mr Elements (AREA)
- Magnetic Heads (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB2003801010250A CN1324560C (zh) | 2002-10-09 | 2003-10-07 | 垂直平面电流结构的磁阻元件和磁头滑块 |
EP03751362A EP1583078A4 (en) | 2002-10-09 | 2003-10-07 | MAGNETORESISTANT EFFECT ELEMENT OF CPP STRUCTURE AND HEAD CURRENT |
KR1020057003749A KR100749577B1 (ko) | 2002-10-09 | 2003-10-07 | Cpp 구조 자기 저항 효과 소자 및 헤드 슬라이더 |
US11/022,733 US20050099737A1 (en) | 2002-10-09 | 2004-12-27 | Current-perpendicular-to-the-plane structure magnetoresistive element and head slider including the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002296080A JP2004133982A (ja) | 2002-10-09 | 2002-10-09 | Cpp構造磁気抵抗効果素子およびヘッドスライダ |
JP2002-296080 | 2002-10-09 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/022,733 Continuation US20050099737A1 (en) | 2002-10-09 | 2004-12-27 | Current-perpendicular-to-the-plane structure magnetoresistive element and head slider including the same |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004034382A1 true WO2004034382A1 (ja) | 2004-04-22 |
Family
ID=32089228
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/012834 WO2004034382A1 (ja) | 2002-10-09 | 2003-10-07 | Cpp構造磁気抵抗効果素子およびヘッドスライダ |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1583078A4 (ja) |
JP (1) | JP2004133982A (ja) |
KR (1) | KR100749577B1 (ja) |
CN (2) | CN1975863B (ja) |
WO (1) | WO2004034382A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4673274B2 (ja) * | 2006-09-11 | 2011-04-20 | ヒタチグローバルストレージテクノロジーズネザーランドビーブイ | 外部ストレス耐性の高い磁気抵抗効果型ヘッド |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07287817A (ja) * | 1994-04-15 | 1995-10-31 | Citizen Watch Co Ltd | 磁気抵抗効果型ヘッド |
JPH11509956A (ja) * | 1996-05-24 | 1999-08-31 | エム・ケイ・イー−クウォンタム・コンポーネンツ・コロラド・リミテッド・ライアビリティ・カンパニー | 面垂直電流スピンバルブタイプ磁気抵抗トランスデューサ |
JP2002118306A (ja) * | 2000-10-05 | 2002-04-19 | Matsushita Electric Ind Co Ltd | 磁気抵抗素子および多素子型磁気抵抗素子 |
JP2003229612A (ja) * | 2002-01-31 | 2003-08-15 | Toshiba Corp | 磁気抵抗効果センサーおよび磁気ディスク装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2725977B2 (ja) * | 1992-08-28 | 1998-03-11 | インターナショナル・ビジネス・マシーンズ・コーポレイション | 磁気抵抗センサ及びその製造方法、磁気記憶システム |
JP2669376B2 (ja) * | 1995-01-27 | 1997-10-27 | 日本電気株式会社 | 磁気抵抗効果ヘッド |
US6198609B1 (en) * | 1998-11-09 | 2001-03-06 | Read-Rite Corporation | CPP Magnetoresistive device with reduced edge effect and method for making same |
JP3550533B2 (ja) * | 2000-07-06 | 2004-08-04 | 株式会社日立製作所 | 磁界センサー、磁気ヘッド、磁気記録再生装置及び磁気記憶素子 |
JP3562447B2 (ja) * | 2000-07-10 | 2004-09-08 | Tdk株式会社 | 磁気抵抗効果型薄膜磁気ヘッド |
US6680829B2 (en) * | 2000-09-13 | 2004-01-20 | Seagate Technology Llc | MR structures for high areal density reader by using side shields |
EP2699907A1 (en) | 2011-04-19 | 2014-02-26 | Porex Corporation | Cards for sample storage and delivery comprising sintered porous plastic |
-
2002
- 2002-10-09 JP JP2002296080A patent/JP2004133982A/ja active Pending
-
2003
- 2003-10-07 EP EP03751362A patent/EP1583078A4/en not_active Withdrawn
- 2003-10-07 CN CN200610168303XA patent/CN1975863B/zh not_active Expired - Fee Related
- 2003-10-07 WO PCT/JP2003/012834 patent/WO2004034382A1/ja not_active Application Discontinuation
- 2003-10-07 KR KR1020057003749A patent/KR100749577B1/ko not_active IP Right Cessation
- 2003-10-07 CN CNB2003801010250A patent/CN1324560C/zh not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07287817A (ja) * | 1994-04-15 | 1995-10-31 | Citizen Watch Co Ltd | 磁気抵抗効果型ヘッド |
JPH11509956A (ja) * | 1996-05-24 | 1999-08-31 | エム・ケイ・イー−クウォンタム・コンポーネンツ・コロラド・リミテッド・ライアビリティ・カンパニー | 面垂直電流スピンバルブタイプ磁気抵抗トランスデューサ |
JP2002118306A (ja) * | 2000-10-05 | 2002-04-19 | Matsushita Electric Ind Co Ltd | 磁気抵抗素子および多素子型磁気抵抗素子 |
JP2003229612A (ja) * | 2002-01-31 | 2003-08-15 | Toshiba Corp | 磁気抵抗効果センサーおよび磁気ディスク装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1583078A4 * |
Also Published As
Publication number | Publication date |
---|---|
CN1324560C (zh) | 2007-07-04 |
KR20050057170A (ko) | 2005-06-16 |
KR100749577B1 (ko) | 2007-08-16 |
CN1703739A (zh) | 2005-11-30 |
EP1583078A4 (en) | 2005-12-14 |
EP1583078A1 (en) | 2005-10-05 |
CN1975863A (zh) | 2007-06-06 |
JP2004133982A (ja) | 2004-04-30 |
CN1975863B (zh) | 2010-05-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7587811B2 (en) | Method for manufacturing a magnetic write head for perpendicular magnetic data recording | |
JP2004103769A (ja) | Cpp構造磁気抵抗効果素子 | |
US7355825B2 (en) | Current-perpendicular-to-the-plane structure magnetoresistive element and head slider | |
JP2004118978A (ja) | 薄膜磁気ヘッド | |
JP2002329905A (ja) | Cpp構造磁気抵抗効果素子およびその製造方法 | |
JP2004199812A (ja) | 薄膜磁気ヘッド及びその製造方法 | |
US7123451B2 (en) | Thin-film magnetic head for reading magnetic information on a hard disk by utilizing a magnetoresistance effect | |
US20150030886A1 (en) | Magnetoresistive element, magnetic head, and magnetic recording and reproducing apparatus | |
JP2004056037A (ja) | Cpp構造磁気抵抗効果素子 | |
JP2002185059A (ja) | 磁気抵抗効果素子 | |
JP2000331318A (ja) | 磁気抵抗効果ヘッド | |
KR100822593B1 (ko) | 자기 헤드의 제조 방법 | |
JP2004355682A (ja) | 薄膜磁気ヘッド | |
JP4230702B2 (ja) | Cpp構造磁気抵抗効果素子の製造方法 | |
KR100617282B1 (ko) | Cpp 구조 자기 저항 효과 소자 | |
WO2004034382A1 (ja) | Cpp構造磁気抵抗効果素子およびヘッドスライダ | |
WO2004051762A1 (ja) | 電磁変換素子およびcpp構造磁気抵抗効果素子 | |
KR100671865B1 (ko) | Cpp 구조 자기 저항 효과 소자 및 헤드 슬라이더 | |
JP4005957B2 (ja) | 薄膜磁気ヘッド、ヘッドジンバルアセンブリ、及びハードディスク装置 | |
JP2006261259A (ja) | 磁気抵抗効果素子、磁気抵抗効果素子の製造方法及び磁気ヘッド、磁気情報再生装置 | |
US20050099737A1 (en) | Current-perpendicular-to-the-plane structure magnetoresistive element and head slider including the same | |
JP2009087506A (ja) | 垂直記録用再生磁気ヘッド、複合型薄膜磁気ヘッド、及び、磁気記録装置 | |
JP2004206839A (ja) | 薄膜磁気ヘッド、薄膜磁気ヘッド組立体、記憶装置、及び薄膜磁気ヘッドの製造方法 | |
US20170263273A1 (en) | Magnetic read head with floating trailing shield | |
WO2010067418A1 (ja) | 磁気記録ヘッドおよび記憶装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CN KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 11022733 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2003751362 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020057003749 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 20038A10250 Country of ref document: CN |
|
WWP | Wipo information: published in national office |
Ref document number: 1020057003749 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 2003751362 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 2003751362 Country of ref document: EP |