JPH1186210A - Magnetic head and magnetic disk apparatus using the same - Google Patents

Magnetic head and magnetic disk apparatus using the same

Info

Publication number
JPH1186210A
JPH1186210A JP23558797A JP23558797A JPH1186210A JP H1186210 A JPH1186210 A JP H1186210A JP 23558797 A JP23558797 A JP 23558797A JP 23558797 A JP23558797 A JP 23558797A JP H1186210 A JPH1186210 A JP H1186210A
Authority
JP
Japan
Prior art keywords
head
recording
magnetic
magnetic pole
written
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
Application number
JP23558797A
Other languages
Japanese (ja)
Inventor
Ikuo Saito
郁夫 斎藤
Yoji Maruyama
洋治 丸山
Kazusukatsu Igarashi
万壽和 五十嵐
Yoshio Suzuki
良夫 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP23558797A priority Critical patent/JPH1186210A/en
Publication of JPH1186210A publication Critical patent/JPH1186210A/en
Pending legal-status Critical Current

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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/027—Analogue recording
    • G11B5/03—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
    • 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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09—Digital recording
    • 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
    • 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
    • G11B5/17—Construction or disposition of windings
    • 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
    • G11B5/265—Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track
    • G11B5/2652—Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track with more than one gap simultaneously operative
    • 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
    • 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
    • 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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/024—Erasing
    • 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
    • G11B5/313—Disposition of layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
    • G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
    • G11B5/3967—Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)

Abstract

PROBLEM TO BE SOLVED: To restrict a bit shift amount within a predetermined value even when a scanning density of a magnetic disk apparatus is increased by using a head provided with a demagnetization part demagnetizing in a perpendicular direction to a recording direction, i.e., in a truck width direction. SOLUTION: A recording reproduction separation type head having demagnetization magnetic poles includes an upper magnetic pole 1 of a recording head, coils 2 for exciting a magnetic field of the recording head, a lower magnetic pole 3 of the recording head, a demagnetization right magnetic pole 4, a coil 5 for exciting a demagnetization magnetic field, a shield for a magnetoresistance effect type reproduction head as well as for the lower magnetic pole of the recording head, a left demagnetization magnetic pole 6, an upper shield 7 for the magnetoresistance effect type reproduction head, an electrode 8 for supplying a current to a magnetoresistance effect type sensor and, the magnetoresistance effect type sensor 9, etc. The demagnetization magnetic pole having a function of uniforming a state of a written position is provided at the head, so that recordings written earlier are deleted to prevent a shift of a record position for information to be written later because of influences of the already written recordings.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】消磁用磁極を備えた記録再生
一体型ヘッドまたは記録再生分離型ヘッドおよびこれら
を用いた磁気ディスク装置に関する。[0001] 1. Field of the Invention [0002] The present invention relates to a recording / reproducing integrated head or a recording / reproducing separated type head having a demagnetizing magnetic pole, and a magnetic disk drive using the same.

【０００２】[0002]

【従来の技術】磁気ディスク装置では、新しい情報を記
録するにあたって特に以前に書かれた情報を、消去ヘッ
ドにより新しい情報を書く前に消去することなく、記録
ヘッドで古い情報上に直接上書きを行っていた。従来は
新しい情報の書き込みに際して、これから書き込む信号
に応じて書き込む情報の長さを調節して記録されたビッ
トの長さが一様になるように補正を行っていた。しかし
線記録密度が上がるにつれて、以前書かれていた記録の
影響を受けて、後から書かれる情報の記録位置が、本来
書かれるべき位置からずれるという現象の影響が無視で
きなくなってきた。2. Description of the Related Art In a magnetic disk apparatus, when recording new information, information previously written is directly overwritten on old information by a recording head without erasing information before writing new information by an erasing head. I was Conventionally, when writing new information, the length of information to be written is adjusted according to a signal to be written from now on, and correction is performed so that the length of recorded bits becomes uniform. However, as the linear recording density increases, the effect of the phenomenon that the recording position of the information to be written later deviates from the position where it should be originally written cannot be ignored due to the influence of the previously written recording.

【０００３】この問題を解決するには、これから上書き
する記録位置の磁化の向きを書く前に調べるか、既に書
いてある記録を消去することによりこれから上書きする
記録位置の磁化状態を一様にしておくことが考えられ
る。In order to solve this problem, the direction of magnetization of the recording position to be overwritten is checked before writing, or the already written data is erased to make the magnetization state of the recording position to be overwritten uniform. It is possible to put.

【０００４】[0004]

【発明が解決しようとする課題】磁気ディスク装置は、
磁性体からなる磁気ディスク媒体に、電磁気的な作用を
利用して情報を書き込みあるいは書かれている情報を読
み出すものである。The magnetic disk drive is:
Information is written on or read from a magnetic disk medium made of a magnetic material by using an electromagnetic action.

【０００５】新たに書き込まれる情報の記録状態は、初
期消磁された場所または不要の情報が書き込まれている
場所に上書きされる。従って記録される情報の記録位置
は、書き込まれる情報のビットパターンと既に書かれて
いる記録の磁化状態によって定まる。[0005] The recording state of newly written information is overwritten on a place where initial demagnetization or a place where unnecessary information is written. Therefore, the recording position of the information to be recorded is determined by the bit pattern of the information to be written and the magnetization state of the already written recording.

【０００６】従来は既にディスク上に書かれている記録
ではなくて、これから書き込む信号に応じて書き込む情
報の長さを調節して記録ビットの長さが一様になるよう
に補正を行っていた。Conventionally, the length of information to be written is adjusted according to a signal to be written, instead of recording already written on a disk, and correction is performed so that the length of recording bits becomes uniform. .

【０００７】近年磁気ディスク装置の記録容量が著しく
増大したが装置としての容量は変化していない。従って
装置の記録密度、特に線記録密度の増大度が著しい。線
記録密度が上がるにつれて、以前書かれていた記録の影
響を受けて、後から書かれる情報の記録位置が、本来書
かれる位置からずれるという現象が著しくなってきた。
本来記録されるべき位置からずれると、書かれている情
報を間違って読みとる原因になる。実験より線記録密度
が１７５ｋＦＣＩを越えるとこれから書き込む信号に応
じて書き込む情報の長さを調節するだけでは補正しきれ
ないことが判明した。In recent years, the recording capacity of a magnetic disk device has increased significantly, but the capacity of the device has not changed. Therefore, the recording density of the apparatus, particularly the linear recording density, is remarkably increased. As the linear recording density increases, the phenomenon that the recording position of information to be written later deviates from the originally written position due to the influence of the previously written recording has become remarkable.
Deviations from the position where they should be recorded can cause incorrect reading of written information. From experiments, it has been found that when the linear recording density exceeds 175 kFCI, correction cannot be made by simply adjusting the length of information to be written according to a signal to be written.

【０００８】本来書かれるべき位置からのずれは既記録
の磁化の向きと位置および記録しようとしている記録の
磁化の向きに相関があるので、補正することが考えられ
るが、既記録状態と位置を検知しその後補正をするの
は、補正に時間がかかるので情報の書き込みは、一トラ
ック分遅れてしまうので時間がかかり実用的ではない。The deviation from the originally written position is correlated with the direction and position of the already recorded magnetization and the direction of the magnetization of the recording to be recorded. Detecting and correcting thereafter is time consuming, and writing information is delayed by one track, which is time consuming and impractical.

【０００９】また消磁の方向を、記録ヘッドで記録する
方向と同じにすると、消磁の方向と記録ビットの磁化の
向きが同じかどうかを判定して補正をする必要がある。If the direction of degaussing is made the same as the direction of recording by the recording head, it is necessary to determine whether the direction of degaussing and the direction of magnetization of the recording bit are the same and make a correction.

【００１０】[0010]

【課題を解決するための手段】新たに書き込まれる情報
の記録は、初期消去された場所または不要の情報が書き
込まれている場所に上書きされる。従って記録される情
報の記録位置は、書き込まれる情報のビットパターンと
既に書かれている記録の磁化状態によって定まる。書き
込まれる情報のビットパターンの影響は、書き込み時に
補正を行って、正しい位置に記録されるようにしてい
た。しかし、記録の線密度が上がってくると、既に書か
れている記録の磁化状態による記録位置の変化すなわち
ビットシフトも無視できなくなってきた。A record of newly written information is overwritten on a place where the information is initially erased or a place where unnecessary information is written. Therefore, the recording position of the information to be recorded is determined by the bit pattern of the information to be written and the magnetization state of the already written recording. The influence of the bit pattern of the information to be written is corrected at the time of writing so that the information is recorded at a correct position. However, as the recording linear density increases, the change in the recording position, that is, the bit shift due to the magnetization state of the already-written recording cannot be ignored.

【００１１】磁気ディスク装置の記録媒体に書かれる記
録の線記録密度が１７５ｋＦＣＩを越えると、従来のよ
うに以前書かれた記録の上に上書きする方法では、既に
書かれている記録の磁化状態による記録位置の変化量が
線記録密度に比例して増えて、読み出しエラーが増大す
る。書き込み速度を落とさずに、正しい記録位置に書き
込むために、新しい情報を書き込む直前に古い情報を消
去するための磁極を書き込みヘッドの前に設ける。トラ
ック幅方向に消磁する事により、記録方向による補正の
必要がなくすることができる。When the linear recording density of a recording to be written on a recording medium of a magnetic disk device exceeds 175 kFCI, the conventional method of overwriting a previously written recording depends on the magnetization state of the already written recording. The amount of change in the recording position increases in proportion to the linear recording density, and the reading error increases. In order to write to the correct recording position without reducing the writing speed, a magnetic pole for erasing old information immediately before writing new information is provided in front of the write head. Degaussing in the track width direction can eliminate the need for correction in the recording direction.

【００１２】本発明の磁気ヘッドの特徴は、既に書き込
まれている記録の影響を受けて、後から書込む情報の記
録位置のずれが起こりにくい様に先に書き込まれている
記録を消去する、すなわち書き込まれる場所の状態を一
様にする機能を持つ消磁用磁極をヘッドに設けたもので
ある。本ヘッドにより、１７５ｋＦＣＩ以上の線記録密
度では１５%を越えていたビットシフト量を５%以内に押
さえることができる。A feature of the magnetic head of the present invention is that the previously written record is erased under the influence of the already written record so that the recording position of the information to be written later is hardly shifted. That is, the head is provided with a demagnetizing magnetic pole having a function of making the state of a writing location uniform. With this head, the bit shift amount exceeding 15% at a linear recording density of 175 kFCI or more can be suppressed to within 5%.

【００１３】また、本発明の磁気ディスク装置の特徴
は、磁気記録媒体、磁気記録媒体にデータを記録しまた
記録されたデータを読み出すための磁気ヘッド、磁気記
録媒体と磁気ヘッドの相対位置を移動させるための駆動
手段、データの読み出しを行うための再生手段およびこ
れらの制御を行うための制御手段を有し、上述の記録の
方向と垂直の向きに消磁する消磁用磁極を備えたヘッド
を用いるようにしたものである。Further, the magnetic disk drive of the present invention is characterized by a magnetic recording medium, a magnetic head for recording data on the magnetic recording medium and reading the recorded data, and moving a relative position between the magnetic recording medium and the magnetic head. Using a head having a driving means for causing the data to be read out, a reproducing means for reading out the data, and a control means for controlling these, and having a demagnetizing magnetic pole for demagnetizing in the direction perpendicular to the recording direction described above. It is like that.

【００１４】[0014]

【発明の実施の形態】以下本発明の詳細を実施例を用い
て説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below using embodiments.

【００１５】（実施例１）図１は、本発明の基本的な考
えに従ってつくられた消磁用磁極を備えた録再分離型ヘ
ッドの模式的斜視図である。図２は、本ヘッドの模式的
断面図である。図３は、本ヘッドの模式的上面図であ
る。(Embodiment 1) FIG. 1 is a schematic perspective view of a recording / reproducing separation type head having a demagnetizing magnetic pole formed according to the basic idea of the present invention. FIG. 2 is a schematic sectional view of the head. FIG. 3 is a schematic top view of the head.

【００１６】記録ヘッドの上部磁極１、記録ヘッドの磁
界を励起するためのコイル２、記録ヘッドの下部磁極
３、消磁用の右側磁極４、消磁用の磁界を励起するため
のコイル５、記録ヘッド下部磁極兼磁気抵抗効果型再生
ヘッド用シールド５、消磁用の左側磁極６、磁気抵抗効
果型再生ヘッド用上部シールド７、磁気抵抗効果型セン
サーに電流を供給するための電極８、磁気抵抗効果型セ
ンサー９、および磁気抵抗効果型再生ヘッド用下部シー
ルド１０は、基盤１１の酸化シリコン膜上にスパッタに
より作成されたパーマロイ膜である。An upper magnetic pole 1 of the recording head, a coil 2 for exciting the magnetic field of the recording head, a lower magnetic pole 3, a right magnetic pole 4 for demagnetization, a coil 5 for exciting the demagnetizing magnetic field, a recording head Lower magnetic pole and magnetoresistive effect reproducing head shield 5, Left magnetic pole 6 for demagnetization, Upper shield 7 for magnetoresistive effect reproducing head, Electrode 8 for supplying current to magnetoresistive sensor, Magnetoresistive effect The sensor 9 and the lower shield 10 for the magnetoresistive read head are permalloy films formed on the silicon oxide film of the substrate 11 by sputtering.

【００１７】また磁気抵抗効果型再生ヘッド用磁気抵抗
効果型センサにセンス電流を供給する電極８はタングス
テンでスパッタにより作成したものである。The electrode 8 for supplying a sense current to the magnetoresistive sensor for the magnetoresistive read head is formed by sputtering with tungsten.

【００１８】なお記録ヘッドの諸元はギャップ長０．２
μｍ、トラック幅は２．４μｍ、コイルの巻き数は２０
ターンである。The recording head has a gap length of 0.2.
μm, track width is 2.4 μm, and the number of coil turns is 20
It is a turn.

【００１９】（実施例２）実施例１で作成した消磁部付
きのヘッドの記録特性を、ＭＦＭを用いて評価した。測
定に使用した磁気ディスクは、Ｃｏ−Ｃｒ−Ｔa系のス
パッタ媒体である。媒体の飽和磁化は５５０ｅｍｕ／ｃ
ｃ、保磁力は２４４０Ｏｅ、膜厚は２６ｎｍである。(Example 2) The recording characteristics of the head with a demagnetizing section prepared in Example 1 were evaluated using MFM. The magnetic disk used for the measurement is a Co-Cr-Ta sputter medium. The saturation magnetization of the medium is 550 emu / c
c, the coercive force is 2440 Oe, and the film thickness is 26 nm.

【００２０】記録ヘッドの諸元は、ギャップ長０．２μ
ｍ、トラック幅２．４μｍ、コイルの巻き数２０ターン
で、ヘッドと媒体間の浮上高さ６５ｎｍ、周速１５．９
ｍ／秒の条件でダイビットを記録した。The specifications of the recording head are as follows.
m, the track width is 2.4 μm, the number of turns of the coil is 20 turns, the flying height between the head and the medium is 65 nm, and the peripheral speed is 15.9.
The dibit was recorded under the condition of m / sec.

【００２１】（実施例３）図４(a)及び(b)は、本発明の
磁気ディスク装置の一実施例の模式図である。複数枚の
磁気記録媒体２１が、スピンドル軸に取り付けられてお
り、磁気記録媒体駆動系２２により高速回転される。こ
の磁気記録媒体２１の記録面に対して上記いずれかの実
施例で製造した消磁ヘッドを持つ磁気ヘッド２３が配置
されており、そのうちの１個は位置決め用サーボヘッド
として作用する。消磁ヘッドを備えた磁気ヘッド２３
は、磁気ヘッド駆動系２４により磁気ディスクの半径方
向に移動される。(Embodiment 3) FIGS. 4A and 4B are schematic views of an embodiment of a magnetic disk drive according to the present invention. A plurality of magnetic recording media 21 are mounted on a spindle shaft and rotated at high speed by a magnetic recording medium drive system 22. A magnetic head 23 having a degaussing head manufactured in any of the above embodiments is arranged on the recording surface of the magnetic recording medium 21, and one of them functions as a positioning servo head. Magnetic head 23 with degaussing head
Is moved in the radial direction of the magnetic disk by the magnetic head drive system 24.

【００２２】またデータの記録再生信号を処理する記録
再生信号処理系２５等が設けられており、記録電流の反
転タイミングの記録補償量の制御等の信号処理を行って
いる。消磁ヘッドの消磁方向と逆方向の磁化を記録する
場合に、記録ヘッドの記録電流の反転タイミングの記録
補償量を、消磁方向と逆方向から消磁方向へ記録する場
合の記録補償量に比べて約５％位相を進めるように設定
をおこなった。A recording / reproducing signal processing system 25 for processing data recording / reproducing signals is provided, and performs signal processing such as control of a recording compensation amount at a reversal timing of a recording current. When recording magnetization in the direction opposite to the degaussing direction of the degaussing head, the recording compensation amount at the reversal timing of the recording current of the recording head is approximately smaller than the recording compensation amount when recording from the direction opposite to the degaussing direction to the degaussing direction. The setting was made to advance the phase by 5%.

【００２３】この磁気ディスク装置を用いて、上記実施
例で製造した消磁ヘッドを備えた磁気ヘッドにより書き
込み読み出しを行ったところ、いずれも読み誤り率が消
磁ヘッドを設けない装置よりも低かった。When writing and reading were performed by using the magnetic disk device and the magnetic head having the degaussing head manufactured in the above embodiment, the reading error rate was lower than that of the device without the degaussing head.

【００２４】本実施例では、記録ヘッドとして磁気誘導
型ヘッド、再生ヘッドとしてＭＲヘッドの録再分離型ヘ
ッドを用いたが、磁気誘導型の記録再生ヘッドを用いた
録再一体型ヘッドでも同様の効果が得られている。また
本実施例では、面内記録について述べたが、垂直記録に
ついても同様の効果が確かめられている。また本実施例
では直流消磁を行った場合について述べたが、交流消磁
によっても同様の効果が確かめられている。In this embodiment, a recording / reproducing separation type head using a magnetic induction type head as a recording head and an MR head as a reproducing head is used. The effect has been obtained. In the present embodiment, the in-plane recording has been described, but the same effect has been confirmed for the perpendicular recording. In this embodiment, the case where DC degaussing is performed has been described, but the same effect has been confirmed by AC degaussing.

【００２５】（実施例４）前実施例のヘッドのほかに以
下の構造のヘッドを作成した。第５図はその消磁部の上
面図である。図６は、本ヘッドの模式的断面図である。
図７は、本ヘッドの模式的断面構造図である。Embodiment 4 In addition to the head of the previous embodiment, a head having the following structure was prepared. FIG. 5 is a top view of the degaussing section. FIG. 6 is a schematic sectional view of the head.
FIG. 7 is a schematic sectional structural view of the head.

【００２６】記録ヘッドの上部磁極１、記録ヘッドの磁
界を励起するためのコイル２、消磁用の右側磁極４、消
磁用の磁界を励起するためのコイル５、記録ヘッド下部
磁極兼磁気抵抗効果型再生ヘッド用上部シールド１２、
消磁用の左側磁極６、磁気抵抗効果型再生ヘッド用上部
シールド７、磁気抵抗効果型センサーに電流を供給する
ための電極８、磁気抵抗効果型センサー９、および磁気
抵抗効果型再生ヘッド用下部シールド１０は、基盤１１
の酸化シリコン膜上にスパッタにより作成されたパーマ
ロイ膜である。消磁用の右側磁極４、消磁用の磁界を励
起するためのコイル５、消磁用の左側磁極６を１、２、
３、８、９、１０、１１、１２から構成された記録再生
一体型ヘッド１３を張り合わせたものである。An upper magnetic pole 1 of the recording head, a coil 2 for exciting the magnetic field of the recording head, a right magnetic pole 4 for degaussing, a coil 5 for exciting the demagnetizing magnetic field, a lower magnetic pole of the recording head and a magnetoresistive effect type Upper shield 12 for reproducing head,
Left pole 6 for demagnetization, upper shield 7 for magnetoresistive read head, electrode 8 for supplying current to magnetoresistive sensor, magnetoresistive sensor 9, and lower shield for magnetoresistive read head 10 is the base 11
Is a permalloy film formed by sputtering on the silicon oxide film. The right magnetic pole 4 for demagnetization, the coil 5 for exciting the demagnetizing magnetic field, and the left magnetic pole 6 for degaussing are 1, 2,
A recording / reproducing integrated head 13 composed of 3, 8, 9, 10, 11, and 12 is attached.

【００２７】（実施例５）実施例４で作成した消磁部付
きのヘッドの記録特性を、ＭＦＭを用いて評価した。測
定に使用した磁気ディスクは、Ｃｏ−Ｃｒ−Ｔa系のス
パッタ媒体である。媒体の飽和磁化は５５０ｅｍｕ／ｃ
ｃ、保磁力は２４４０Ｏｅ、膜厚は２６ｎｍである。(Example 5) The recording characteristics of the head having a demagnetizing section prepared in Example 4 were evaluated using MFM. The magnetic disk used for the measurement is a Co-Cr-Ta sputter medium. The saturation magnetization of the medium is 550 emu / c
c, the coercive force is 2440 Oe, and the film thickness is 26 nm.

【００２８】記録ヘッドの諸元は、ギャップ長０．２μ
ｍ、トラック幅２．４μｍ、コイルの巻き数２０ターン
で、ヘッドと媒体間の浮上高さ６５ｎｍ、周速１５．９
ｍ／秒の条件でダイビットを記録した。The recording head has a gap length of 0.2 μm.
m, the track width is 2.4 μm, the number of turns of the coil is 20 turns, the flying height between the head and the medium is 65 nm, and the peripheral speed is 15.9.
The dibit was recorded under the condition of m / sec.

【００２９】[0029]

【発明の効果】本発明によれば、トラック幅方向に消磁
する消磁部を備えたヘッドを用いて記録を行うことによ
り、１７５ｋＦＣＩを越えると従来のヘッドでは１５%
を越えるビットシフト量であったが、磁気ディスク装置
の線密度を上げてもビットシフトの量を５%以内に押さ
えることができ、従来の信号処理を用いて読み誤りの少
ない磁気ディスク装置が得られた。According to the present invention, recording is performed using a head provided with a demagnetizing portion for demagnetizing in the track width direction.
However, even if the linear density of the magnetic disk device was increased, the bit shift amount could be kept within 5%, and a magnetic disk device with few reading errors could be obtained using the conventional signal processing. Was done.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明のトラック幅方向に消磁用磁極を有する
録再一体型ヘッドの一例の模式的斜視図である。FIG. 1 is a schematic perspective view of an example of a recording / reproducing integrated head having a demagnetizing magnetic pole in a track width direction according to the present invention.

【図２】本発明のトラック幅方向に消磁用磁極を有する
録再一体型ヘッドの一例の模式的断面図である。FIG. 2 is a schematic sectional view of an example of a recording / reproducing integrated head having a demagnetizing magnetic pole in a track width direction according to the present invention.

【図３】本発明の消磁用磁極を有する録再一体型ヘッド
の一例の模式的上面図である。FIG. 3 is a schematic top view of an example of a recording / reproducing integrated head having a demagnetizing magnetic pole according to the present invention.

【図４】本発明の磁気ディスク装置の一実施例の模式図
である。FIG. 4 is a schematic view of one embodiment of the magnetic disk drive of the present invention.

【図５】本発明の磁気ディスク装置の一実施例の消磁部
の上面図である。FIG. 5 is a top view of a degaussing section of the magnetic disk drive according to one embodiment of the present invention.

【図６】本発明の磁気ディスク装置の一実施例の消磁用
磁極を備えたヘッドの模式的断面図である。FIG. 6 is a schematic sectional view of a head having a demagnetizing magnetic pole according to an embodiment of the magnetic disk drive of the present invention.

【図７】本発明の磁気ディスク装置の一実施例のヘッド
の模式的構造断面図である。FIG. 7 is a schematic structural sectional view of a head of one embodiment of the magnetic disk drive of the present invention.

【符号の説明】[Explanation of symbols]

１…記録ヘッド上部磁極、２…記録ヘッド用コイル消磁
用コイル、３…記録ヘッド下部磁極、４…消磁用右側磁
極、５…消磁用コイル、６…消磁用左側磁極、７…磁気
抵抗効果型再生ヘッド用上部シールド、８…磁気抵抗効
果型再生ヘッド用電極、９…磁気抵抗効果型センサ、１
０…磁気抵抗効果型再生ヘッド用下部シールド、１１…
基盤、１２…記録ヘッド下部磁極兼磁気抵抗効果型再生
ヘッド用上部シールド、１３…録再一体型ヘッド、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
号処理部。DESCRIPTION OF SYMBOLS 1 ... Recording head upper magnetic pole, 2 ... Recording head coil degaussing coil, 3 ... Recording head lower magnetic pole, 4 ... Demagnetizing right magnetic pole, 5 ... Demagnetizing coil, 6 ... Demagnetizing left magnetic pole, 7 ... Magnetoresistance effect type Upper shield for reproducing head, 8 ... electrode for magnetoresistive effect reproducing head, 9 ... magnetoresistive sensor, 1
0: lower shield for magnetoresistive read head, 11:
Substrate, 12: lower magnetic pole of recording head and upper shield for magnetoresistive effect reproducing head, 13: integrated recording / reproducing head, 21
... magnetic recording medium, 22 ... magnetic recording medium driving unit, 23 ... magnetic head, 24 ... magnetic head driving unit, 25 ... recording / reproducing signal processing unit.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 良夫 東京都国分寺市東恋ケ窪一丁目280番地 株式会社日立製作所中央研究所内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshio Suzuki 1-280 Higashi Koigakubo, Kokubunji-shi, Tokyo Inside the Central Research Laboratory, Hitachi, Ltd.

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】記録用ヘッドと再生用ヘッドが一体化され
た録再一体型ヘッドまたは記録用ヘッドと再生用ヘッド
が分離された録再分離型ヘッドの記録用ヘッドの磁極に
対し垂直な方向に配置した消磁用磁極を有することを特
徴とする磁気ヘッド。1. A direction perpendicular to a magnetic pole of a recording / reproducing integrated head in which a recording head and a reproducing head are integrated, or a recording / reproducing separated head in which a recording head and a reproducing head are separated. A magnetic head, comprising: a demagnetizing magnetic pole disposed in the magnetic head. 【請求項２】上記消磁用磁極により構成される空隙がト
ラック幅とほぼ等しいことを特徴とする請求項１記載の
磁気ヘッド。2. A magnetic head according to claim 1, wherein a gap defined by said demagnetizing magnetic pole is substantially equal to a track width. 【請求項３】磁気記録媒体、磁気記録媒体にデータを記
録・再生するための磁気ヘッド、該磁気記録媒体と磁気
ヘッドの相対位置を移動させるための駆動手段、データ
の読み出しを行うための再生手段およびこれらの制御を
行うための制御手段を有する磁気ディスク装置におい
て、記録用ヘッドと再生用ヘッドが一体化された録再一
体型ヘッドまたは記録用ヘッドと再生用ヘッドが分離さ
れた録再分離型ヘッドの記録用ヘッドの磁極に対し垂直
な方向に配置した消磁用磁極を有する磁気ヘッドを用い
たことを特徴とする磁気ディスク装置。3. A magnetic recording medium, a magnetic head for recording / reproducing data on / from the magnetic recording medium, a driving means for moving a relative position between the magnetic recording medium and the magnetic head, and a reproducing for reading data. Recording / reproducing head in which a recording head and a reproducing head are integrated or a recording / reproducing separation in which a recording head and a reproducing head are separated. A magnetic disk drive using a magnetic head having a demagnetizing magnetic pole arranged in a direction perpendicular to a magnetic pole of a recording head of a die head. 【請求項４】上記消磁用磁極により構成される空隙がト
ラック幅とほぼ等しいことを特徴とする請求項３記載の
磁気ヘッド。4. A magnetic head according to claim 3, wherein a gap formed by said demagnetizing magnetic pole is substantially equal to a track width.
JP23558797A 1997-09-01 1997-09-01 Magnetic head and magnetic disk apparatus using the same Pending JPH1186210A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23558797A JPH1186210A (en) 1997-09-01 1997-09-01 Magnetic head and magnetic disk apparatus using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23558797A JPH1186210A (en) 1997-09-01 1997-09-01 Magnetic head and magnetic disk apparatus using the same

Publications (1)

Publication Number Publication Date
JPH1186210A true JPH1186210A (en) 1999-03-30

Family

ID=16988219

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23558797A Pending JPH1186210A (en) 1997-09-01 1997-09-01 Magnetic head and magnetic disk apparatus using the same

Country Status (1)

Country Link
JP (1) JPH1186210A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100416611B1 (en) * 2002-02-14 2004-02-05 삼성전자주식회사 A head and method for writing data and driving system for adapting it
US6839200B2 (en) * 1990-04-16 2005-01-04 Hitachi, Ltd. Combination perpendicular magnetic head having shield material formed at both ends of an upper pole of a write element
US6995950B2 (en) * 2001-04-09 2006-02-07 Maxtor Corporation Transverse biased shields for perpendicular recording to reduce stray field sensitivity
SG123658A1 (en) * 2004-12-28 2006-07-26 Toshiba Kk Head amplifier circuit with function for degaussing residual magnetism of recording head

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6839200B2 (en) * 1990-04-16 2005-01-04 Hitachi, Ltd. Combination perpendicular magnetic head having shield material formed at both ends of an upper pole of a write element
US6995950B2 (en) * 2001-04-09 2006-02-07 Maxtor Corporation Transverse biased shields for perpendicular recording to reduce stray field sensitivity
KR100416611B1 (en) * 2002-02-14 2004-02-05 삼성전자주식회사 A head and method for writing data and driving system for adapting it
SG123658A1 (en) * 2004-12-28 2006-07-26 Toshiba Kk Head amplifier circuit with function for degaussing residual magnetism of recording head
US7460324B2 (en) 2004-12-28 2008-12-02 Kabushiki Kaisha Toshiba Head amplifier circuit with function for degaussing residual magnetism of recording head

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