JPH0935213A - Magnetic disk device - Google Patents
Magnetic disk deviceInfo
- Publication number
- JPH0935213A JPH0935213A JP7185291A JP18529195A JPH0935213A JP H0935213 A JPH0935213 A JP H0935213A JP 7185291 A JP7185291 A JP 7185291A JP 18529195 A JP18529195 A JP 18529195A JP H0935213 A JPH0935213 A JP H0935213A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- disk device
- heat treatment
- magnetic field
- magnetic disk
- 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.)
- Pending
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
- G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
-
- 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
- G11B2005/0002—Special dispositions or recording techniques
- G11B2005/0005—Arrangements, methods or circuits
- G11B2005/0008—Magnetic conditionning of heads, e.g. biasing
-
- 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
- G11B2005/0002—Special dispositions or recording techniques
- G11B2005/0005—Arrangements, methods or circuits
- G11B2005/001—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
- G11B2005/0013—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation
- G11B2005/0016—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation of magnetoresistive transducers
Landscapes
- Magnetic Heads (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は高い磁気抵抗効果を有す
る多層磁気抵抗効果膜を用いた磁気記録再生装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus using a multilayer magnetoresistive film having a high magnetoresistive effect.
【０００２】[0002]
【従来の技術】磁気記録の高密度化に伴い、再生用磁気
ヘッドに用いる磁気抵抗効果材料として、高い磁気抵抗
効果を示す材料が求められている。そこで、Dieny らに
よるフィジカル・レビュー・Ｂ(Pysical Review B)，第
４３巻，第１号，１２９７〜１３００ページに記載の
「軟磁性多層膜における巨大磁気抵抗効果」(GiantMagn
etoresistance in Soft Ferromagnetic Multilayers)の
ように２層の磁性層を非磁性層で磁気的に分離し、一方
の磁性層に反強磁性層からの交換バイアス磁界を印加す
る方法が考案された。この多層膜では、２層の磁性層の
磁化の向きが平行の時に電気抵抗率が低く、磁化の向き
が反平行の時に電気抵抗率が高い。印加する磁界の高さ
により、２層の磁性層の磁化の向きのなす角度が変化す
ることにより磁気抵抗効果が生じる。この材料を用いる
ことにより高い感度を有する磁気抵抗効果素子が得ら
れ、このため、高性能磁気ディスク装置への応用が考え
られている。2. Description of the Related Art As the magnetic recording density increases, a material having a high magnetoresistive effect is required as a magnetoresistive effect material used for a reproducing magnetic head. Therefore, “Giant Magnetoresistance Effect in Soft Magnetic Multilayer Film” described in Physical Review B by Vol.
A method has been devised in which two magnetic layers are magnetically separated by a non-magnetic layer and an exchange bias magnetic field from an antiferromagnetic layer is applied to one magnetic layer, such as etoresistance in Soft Ferromagnetic Multilayers. In this multilayer film, the electrical resistivity is low when the magnetization directions of the two magnetic layers are parallel, and the electrical resistivity is high when the magnetization directions are antiparallel. The magnetoresistive effect is generated by changing the angle formed by the magnetization directions of the two magnetic layers depending on the height of the applied magnetic field. By using this material, a magnetoresistive effect element having high sensitivity can be obtained, and therefore application to a high performance magnetic disk device is considered.
【０００３】[0003]
【発明が解決しようとする課題】上述のように、多層膜
には反強磁性層が含まれている。使用する反強磁性層の
ネール温度は１５０〜２５０℃程度であることが多い。
磁気ディスク装置は、それ自体が発熱し、また、磁気抵
抗効果素子もセンス電流によるジュール熱を発生する。
これらの熱により、反強磁性層がネール温度以上になる
と、本来持っていたスピン配列を失い、隣りあう磁性層
に印加される交換バイアス磁界の向きおよび強さが変化
する。実際には、反強磁性層がネール温度以上に加熱さ
れることは少ない。しかし、反強磁性層は、ネール温度
より低い温度でも、加熱により一部の原子のスピンの向
きが変化する。従って、長い期間、磁気抵抗効果素子を
使用すると、磁気抵抗効果素子の性能が劣化する。As described above, the multilayer film contains the antiferromagnetic layer. The Neel temperature of the antiferromagnetic layer used is often about 150 to 250 ° C.
The magnetic disk device itself generates heat, and the magnetoresistive effect element also generates Joule heat due to the sense current.
When the antiferromagnetic layer has a Neel temperature or higher due to these heats, the spin alignment originally possessed is lost, and the direction and strength of the exchange bias magnetic field applied to the adjacent magnetic layer are changed. In reality, the antiferromagnetic layer is rarely heated above the Neel temperature. However, in the antiferromagnetic layer, the spin directions of some atoms are changed by heating even at a temperature lower than the Neel temperature. Therefore, if the magnetoresistive effect element is used for a long period of time, the performance of the magnetoresistive effect element deteriorates.
【０００４】本発明の目的は、磁気抵抗効果素子の性能
を回復する機構を備えた磁気ディスク装置を提供するこ
とにある。An object of the present invention is to provide a magnetic disk device having a mechanism for recovering the performance of the magnetoresistive effect element.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、上述のよ
うな多層膜を用いた磁気ディスク装置について鋭意研究
を重ねた結果、上記多層膜を磁界中で熱処理する機構を
設けることにより、初期の性能を維持した磁気ディスク
装置を得ることができることを見出し、本発明を完成す
るに至った。DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted extensive studies on a magnetic disk device using a multilayer film as described above, and as a result, by providing a mechanism for heat-treating the multilayer film in a magnetic field, The inventors have found that it is possible to obtain a magnetic disk device that maintains the initial performance, and have completed the present invention.
【０００６】すなわち、複数層の磁性層を非磁性層で分
割し、少なくとも１層の磁性層に反強磁性層からの交換
バイアス磁界が印加されており、少なくとも１層の磁性
層に反強磁性層からの交換バイアス磁界は直接には印加
されていない多層膜を用いた磁気抵抗効果素子を有する
磁気ディスク装置において、上記多層膜を何らかの手段
でネール温度以上に加熱し、その冷却過程で、磁気抵抗
効果素子の磁界検出方向とほぼ平行に磁界を印加する。
この磁界中熱処理を定期的に磁気ディスク装置内で行う
ことにより、磁気抵抗効果素子の初期の性能を維持する
ことができる。That is, a plurality of magnetic layers are divided by non-magnetic layers, and the exchange bias magnetic field from the antiferromagnetic layer is applied to at least one magnetic layer, and at least one magnetic layer is antiferromagnetic. In a magnetic disk device having a magnetoresistive effect element using a multilayer film to which an exchange bias magnetic field from a layer is not directly applied, the multilayer film is heated to a Neel temperature or higher by some means, and in the cooling process, A magnetic field is applied substantially parallel to the magnetic field detection direction of the resistance effect element.
By periodically performing the heat treatment in the magnetic field in the magnetic disk device, the initial performance of the magnetoresistive effect element can be maintained.
【０００７】[0007]
【作用】多層膜をネール温度以上に加熱し、その冷却過
程において、磁気抵抗効果素子の磁界検出方向とほぼ平
行に磁界を印加することにより、反強磁性層のスピン配
列を初期状態に戻す。このスピン配列の初期化により、
磁気抵抗効果素子の初期の性能を維持することができ
る。The multi-layer film is heated to the Neel temperature or higher, and in the cooling process, a magnetic field is applied substantially parallel to the magnetic field detection direction of the magnetoresistive effect element to return the spin alignment of the antiferromagnetic layer to the initial state. By the initialization of this spin array,
The initial performance of the magnetoresistive effect element can be maintained.
【０００８】[0008]
【実施例】以下に本発明について、図表を用いながら具
体的に説明する。The present invention will be specifically described below with reference to the drawings.
【０００９】［実施例１］多層膜の積層構造を図４に示
す。本実施例では、基板１１としてＡｌ2Ｏ3・ＴｉＣを
主成分とする焼結体を用いた。バッファ層１２は、厚さ
５ｎｍのＨｆを用いた。磁性層１３および１５は、それ
ぞれ、厚さ７ｎｍおよび２ｎｍのＮｉ−１６ａｔ％Ｆｅ
−１８ａｔ％Ｃｏ 合金を用いた。非磁性層１４は、厚
さ２.５ｎｍのＣｕを用い、反強磁性層１６は、厚さ１
０ｎｍのＦｅ−４０ａｔ％Ｍｎ合金を用いた。保護層１
７は、厚さ５ｎｍのＨｆを用いた。Example 1 FIG. 4 shows a laminated structure of a multilayer film. In this example, a sintered body containing Al 2 O 3 .TiC as a main component was used as the substrate 11. For the buffer layer 12, Hf having a thickness of 5 nm was used. The magnetic layers 13 and 15 have a thickness of 7 nm and 2 nm of Ni-16 at% Fe, respectively.
A -18 at% Co alloy was used. The nonmagnetic layer 14 is made of Cu having a thickness of 2.5 nm, and the antiferromagnetic layer 16 is made to have a thickness of 1 nm.
A 0 nm Fe-40 at% Mn alloy was used. Protective layer 1
For No. 7, Hf having a thickness of 5 nm was used.
【００１０】上述の多層膜を磁気抵抗効果材料とした磁
気ヘッドを作製した。磁気ヘッドの構造を以下に示す。
図５は記録再生分離型ヘッドの一部分を切断した場合の
斜視図である。多層膜５１をシールド層５２，５３で挾
んだ部分が再生ヘッドとして働き、コイル５４を挾む下
部磁極５５，上部磁極５６の部分が記録ヘッドとして働
く。また、電極５８には、Ｃｒ／Ｃｕ／Ｃｒという多層
構造の材料を用いた。A magnetic head using the above-mentioned multilayer film as a magnetoresistive effect material was manufactured. The structure of the magnetic head is shown below.
FIG. 5 is a perspective view when a part of the recording / reproducing separated type head is cut. A portion of the multilayer film 51 sandwiched by the shield layers 52 and 53 functions as a reproducing head, and portions of the lower magnetic pole 55 and the upper magnetic pole 56 that sandwich the coil 54 function as a recording head. Further, a material having a multilayer structure of Cr / Cu / Cr is used for the electrode 58.
【００１１】以下にこのヘッドの作製方法を示す。The manufacturing method of this head will be described below.
【００１２】Ａｌ2Ｏ3・ＴｉＣを主成分とする焼結体を
スライダ用の基板５７とした。シールド層，記録磁極に
はスパッタリング法で形成したＮｉ−Ｆｅ合金を用い
た。各磁性膜の膜厚は、以下のようにした。上下のシー
ルド層５２，５３は１.０ μｍ、下部磁極５５，上部磁
極５６は３.０μｍ 、各層間のギャップ材はスパッタリ
ングで形成したＡｌ2Ｏ3を用いた。ギャップ層の膜厚
は、シールド層と磁気抵抗効果素子間で０.２μｍ，記
録磁極間では０.４μｍとした。さらに再生ヘッドと記
録ヘッドの間隔は約４μｍとし、このギャップもＡｌ2
Ｏ3で形成した。コイル５４には膜厚３μｍのＣｕを使
用した。また、多層膜の電極間方向の長さを1.0μｍ、
それと直角方向（磁気抵抗効果素子の磁界検出方向）の
長さを０.７μｍとした。A sintered body containing Al 2 O 3 .TiC as a main component was used as the substrate 57 for the slider. A Ni-Fe alloy formed by a sputtering method was used for the shield layer and the recording magnetic pole. The thickness of each magnetic film was as follows. The upper and lower shield layers 52 and 53 were 1.0 μm, the lower magnetic pole 55 and the upper magnetic pole 56 were 3.0 μm, and the gap material between the layers was Al 2 O 3 formed by sputtering. The thickness of the gap layer was 0.2 μm between the shield layer and the magnetoresistive element, and 0.4 μm between the recording magnetic poles. Further, the distance between the reproducing head and the recording head is set to about 4 μm, and this gap is also made of Al 2
Formed with O 3 . Cu having a film thickness of 3 μm was used for the coil 54. In addition, the length between the electrodes of the multilayer film is 1.0 μm,
The length in the direction perpendicular to that (direction of detecting the magnetic field of the magnetoresistive effect element) was set to 0.7 μm.
【００１３】上述の磁気ヘッドを用い、磁気ディスク装
置を作製した。装置の構造を図１に示す。磁気記録媒体
２１には、残留磁束密度０.７５Ｔ のＣｏ−Ｎｉ−Ｐｔ
−Ｔａ系合金からなる材料を用いた。磁気記録媒体２１
は磁気記録媒体駆動部２２により回転する。磁気ヘッド
２３は磁気ヘッド駆動部２４により、磁気記録媒体２１
の無い部分にも移動できる。本発明の磁気ディスク装置
は、他に、記録再生信号処理系２５，磁界中熱処理機構
２６，電磁石２７，電源２８を有する。磁界中熱処理機
構２６を用いる時は、図２のように、磁気ヘッド２３は
電磁石２７の中央部に移動する。A magnetic disk device was manufactured using the above magnetic head. The structure of the device is shown in FIG. The magnetic recording medium 21 contains Co-Ni-Pt having a residual magnetic flux density of 0.75T.
A material made of a Ta-based alloy was used. Magnetic recording medium 21
Is rotated by the magnetic recording medium drive unit 22. The magnetic head 23 is driven by the magnetic head drive unit 24.
You can also move to the part without. The magnetic disk device of the present invention further includes a recording / reproducing signal processing system 25, a magnetic field heat treatment mechanism 26, an electromagnet 27, and a power supply 28. When the heat treatment mechanism 26 in the magnetic field is used, the magnetic head 23 moves to the center of the electromagnet 27 as shown in FIG.
【００１４】磁界中熱処理機構２６の一例を図３に示
す。本実施例では、磁気ヘッド２３を加熱する手段とし
てレーザ光２９を用いた。レーザ光２９は、レーザ源３
１より発生し、光学系３０により収束され、電磁石２７
の穴を通過し、磁気ヘッド２３に入射する。なお、この
実施例では、加熱手段としてレーザ光を用いたが、他の
手段、例えば、赤外線，ヒータなどを用いることもでき
る。また、磁界印加機構として、電磁石を用いたが、永
久磁石による磁界印加などの他の方法を用いても良い。An example of the heat treatment mechanism 26 in a magnetic field is shown in FIG. In this embodiment, the laser beam 29 is used as a means for heating the magnetic head 23. The laser light 29 is generated by the laser source 3
1 is generated, is converged by the optical system 30, and the electromagnet 27
Then, the light enters the magnetic head 23. In this embodiment, laser light is used as the heating means, but other means such as infrared rays or a heater can be used. Further, although the electromagnet is used as the magnetic field applying mechanism, another method such as applying a magnetic field by a permanent magnet may be used.
【００１５】多層膜を用いた磁気抵抗効果型ヘッドの再
生出力を維持する方法は、特開平6−314417号公報のよ
うに、多層膜に磁界のみを印加する方法が考案されてい
る。しかし、特開平6−314417 号公報に記載の方法は、
保磁力の異なる２種類の磁性層を積層したタイプの多層
膜には非常に有効と考えられるが、本発明に用いた反強
磁性層を用いた多層膜の温度による経時変化を回復する
方法は不十分である。反強磁性層中のスピンの向きを揃
えるには、本発明のように、多層膜を加熱することが必
要である。As a method of maintaining the reproduction output of a magnetoresistive head using a multilayer film, a method of applying only a magnetic field to the multilayer film has been devised, as disclosed in Japanese Patent Laid-Open No. 6-314417. However, the method described in JP-A-6-314417 is
Although it is considered to be very effective for a multilayer film of a type in which two types of magnetic layers having different coercive forces are laminated, a method of recovering the change with time of the multilayer film using the antiferromagnetic layer used in the present invention is Is insufficient. In order to align the spin directions in the antiferromagnetic layer, it is necessary to heat the multilayer film as in the present invention.
【００１６】本発明の磁気ディスク装置の再生出力の経
時変化について調べた。結果を図６に示す。図６におい
て、６１は磁界中熱処理機構を用いない時の出力変化で
ある。図のように、再生出力は時間とともに低下する。
これは、多層膜の反強磁性層のスピンの向きがばらつい
たためと考えられる。これに対し、図６の６２のよう
に、１５０時間測定後、磁界中熱処理を行った場合に
は、再生出力は回復する（但し、図６には、磁界中熱処
理の時間は含まれない）。実際の磁気ディスク装置で
は、使用時間がある一定値を過ぎたら、自動的に磁界中
熱処理を行うか、磁気ディスク装置の使用者が、任意に
磁界中熱処理を行う。The change with time of the reproduction output of the magnetic disk device of the present invention was examined. FIG. 6 shows the results. In FIG. 6, 61 is a change in output when the heat treatment mechanism in a magnetic field is not used. As shown, the reproduction output decreases with time.
It is considered that this is because the spin directions of the antiferromagnetic layers of the multilayer film varied. On the other hand, as shown by 62 in FIG. 6, when the heat treatment in the magnetic field is performed after the measurement for 150 hours, the reproduction output is recovered (however, the heat treatment time in the magnetic field is not included in FIG. 6). . In an actual magnetic disk device, when the usage time exceeds a certain value, heat treatment in a magnetic field is automatically performed, or a user of the magnetic disk device arbitrarily performs heat treatment in a magnetic field.
【００１７】[0017]
【発明の効果】本発明によれば、スピン配列の初期化に
より、磁気抵抗効果素子の初期の性能を維持することが
できる。この磁界中熱処理を定期的に磁気ディスク装置
内で行うことにより、磁気ディスク装置は初期の性能を
維持することができる。According to the present invention, the initial performance of the magnetoresistive element can be maintained by initializing the spin alignment. By periodically performing the heat treatment in the magnetic field in the magnetic disk device, the magnetic disk device can maintain the initial performance.
【図１】本発明の磁気ディスク装置の説明図。FIG. 1 is an explanatory diagram of a magnetic disk device of the present invention.
【図２】本発明の磁気ディスク装置における磁界中熱処
理状態における磁気ヘッドの位置を示す説明図。FIG. 2 is an explanatory view showing the position of a magnetic head in a heat treatment state in a magnetic field in the magnetic disk device of the present invention.
【図３】本発明の磁気ディスク装置における磁界中熱処
理機構の説明図。FIG. 3 is an explanatory diagram of a heat treatment mechanism in a magnetic field in the magnetic disk device of the present invention.
【図４】本発明の磁気ディスク装置に用いた多層膜の構
造を示す断面図。FIG. 4 is a sectional view showing the structure of a multilayer film used in the magnetic disk device of the present invention.
【図５】本発明の磁気ディスク装置に用いた磁気ヘッド
の構造を示す斜視図。FIG. 5 is a perspective view showing the structure of a magnetic head used in the magnetic disk device of the present invention.
【図６】本発明の磁気ディスク装置の再生出力の経時変
化を示す特性図。FIG. 6 is a characteristic diagram showing a change over time in reproduction output of the magnetic disk device of the present invention.
２１…磁気記録媒体、２２…磁気記録媒体駆動部、２３
…磁気ヘッド、２４…磁気ヘッド駆動部、２５…記録再
生信号処理系、２６…磁界中熱処理機構、２７…電磁
石、２８…電源。21 ... Magnetic recording medium, 22 ... Magnetic recording medium drive unit, 23
... magnetic head, 24 ... magnetic head drive section, 25 ... recording / reproducing signal processing system, 26 ... magnetic field heat treatment mechanism, 27 ... electromagnet, 28 ... power supply.
Claims (5)
磁性層に反強磁性層からの交換バイアス磁界が印加さ
れ、他方の磁性層には反強磁性層からの交換バイアス磁
界は直接には印加されていない多層構造をなす磁気抵抗
効果材料を用いた磁気抵抗効果素子を有する磁気ディス
ク装置において、上記磁気ディスク装置が上記磁気抵抗
効果素子に磁界中熱処理を行う機構を有することを特徴
とする磁気ディスク装置。1. Two magnetic layers are divided by a non-magnetic layer, an exchange bias magnetic field from an antiferromagnetic layer is applied to one magnetic layer, and an exchange bias from the antiferromagnetic layer is applied to the other magnetic layer. In a magnetic disk device having a magnetoresistive effect element using a magnetoresistive effect material having a multilayer structure in which a magnetic field is not directly applied, the magnetic disk device has a mechanism for performing heat treatment in the magnetic field on the magnetoresistive effect element. A magnetic disk device characterized by the above.
の磁界の発生が電磁石による磁気ディスク装置。2. The magnetic disk device according to claim 1, wherein a magnetic field is generated when performing heat treatment in a magnetic field by an electromagnet.
の磁界の発生が永久磁石による磁気ディスク装置。3. The magnetic disk device according to claim 1, wherein the magnetic field is generated by the heat treatment in the magnetic field by a permanent magnet.
の温度が上記反強磁性層のネール温度以上である磁気デ
ィスク装置。4. The magnetic disk device according to claim 3, wherein the temperature for the heat treatment in the magnetic field is equal to or higher than the Neel temperature of the antiferromagnetic layer.
中熱処理を行う際の加熱がレーザ光による磁気ディスク
装置。5. A magnetic disk device according to claim 1, 2, 3 or 4, wherein heating during heat treatment in a magnetic field is performed by laser light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7185291A JPH0935213A (en) | 1995-07-21 | 1995-07-21 | Magnetic disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7185291A JPH0935213A (en) | 1995-07-21 | 1995-07-21 | Magnetic disk device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0935213A true JPH0935213A (en) | 1997-02-07 |
Family
ID=16168293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7185291A Pending JPH0935213A (en) | 1995-07-21 | 1995-07-21 | Magnetic disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0935213A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6128160A (en) * | 1997-06-30 | 2000-10-03 | Kabushiki Kaisha Toshiba | Head device having spin-valve read head for use in a disk storage apparatus |
| EP1134729A2 (en) * | 2000-03-14 | 2001-09-19 | Kabushiki Kaisha Toshiba | Magnetic head and magnetic recording and reproducing system |
| JP2007193901A (en) * | 2006-01-20 | 2007-08-02 | Hitachi Computer Peripherals Co Ltd | Method and apparatus for correcting pin rotation |
| JP2009004023A (en) * | 2007-06-21 | 2009-01-08 | Sharp Corp | Magnetic recording and reproducing system |
-
1995
- 1995-07-21 JP JP7185291A patent/JPH0935213A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6128160A (en) * | 1997-06-30 | 2000-10-03 | Kabushiki Kaisha Toshiba | Head device having spin-valve read head for use in a disk storage apparatus |
| US6462897B1 (en) | 1997-06-30 | 2002-10-08 | Kabushiki Kaisha Toshiba | Head device having spin-valve read head for use in a disk storage apparatus |
| EP1134729A2 (en) * | 2000-03-14 | 2001-09-19 | Kabushiki Kaisha Toshiba | Magnetic head and magnetic recording and reproducing system |
| EP1134729A3 (en) * | 2000-03-14 | 2002-08-07 | Kabushiki Kaisha Toshiba | Magnetic head and magnetic recording and reproducing system |
| US6636390B2 (en) | 2000-03-14 | 2003-10-21 | Kabushiki Kaisha Toshiba | Magnetic head and magnetic recording and reproducing system |
| JP2007193901A (en) * | 2006-01-20 | 2007-08-02 | Hitachi Computer Peripherals Co Ltd | Method and apparatus for correcting pin rotation |
| JP2009004023A (en) * | 2007-06-21 | 2009-01-08 | Sharp Corp | Magnetic recording and reproducing system |
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