JPS62298016A - Magnetic disk device - Google Patents
Magnetic disk deviceInfo
- Publication number
- JPS62298016A JPS62298016A JP14054986A JP14054986A JPS62298016A JP S62298016 A JPS62298016 A JP S62298016A JP 14054986 A JP14054986 A JP 14054986A JP 14054986 A JP14054986 A JP 14054986A JP S62298016 A JPS62298016 A JP S62298016A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- servo
- layer
- magnetic head
- 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
- 239000000758 substrate Substances 0.000 abstract description 12
- 229910000684 Cobalt-chrome Inorganic materials 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 5
- 239000010952 cobalt-chrome Substances 0.000 abstract description 5
- 238000004544 sputter deposition Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 229910052681 coesite Inorganic materials 0.000 abstract description 3
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 3
- 229910052682 stishovite Inorganic materials 0.000 abstract description 3
- 229910052905 tridymite Inorganic materials 0.000 abstract description 3
- 239000004642 Polyimide Substances 0.000 abstract description 2
- 229920001721 polyimide Polymers 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 17
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 2
- 229910000889 permalloy Inorganic materials 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229910000702 sendust Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910015140 FeN Inorganic materials 0.000 description 1
- 229910003266 NiCo Inorganic materials 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000000992 sputter etching Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on 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
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/488—Disposition of heads
- G11B5/4886—Disposition of heads relative to rotating disc
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
Description
【発明の詳細な説明】
発明の詳細な説明
（産業上の利用分野）
本発明は磁気ディスク装置に関し、特に磁気２重層ディ
スクを用いた磁気ヘッド位置決め方式に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a magnetic disk device, and more particularly to a magnetic head positioning system using a magnetic double layer disk.
（従来の技術）
従来、リジッド磁気ディスク装置はサーボ面サーボ方式
が、主流となっているが゛、このサーボ面サーボ方式は
同一シャフトに実装された複数個の磁気ディスクの中の
一面をサーボ用ディスクとして用い、そのサーボ用ディ
スクのサーボ情報により他のデータ用ディスク上の磁気
ヘッドを位置決めする方式である。(Prior technology) Conventionally, the servo surface servo method has been the mainstream for rigid magnetic disk drives. However, this servo surface servo method uses one surface of multiple magnetic disks mounted on the same shaft for servo use. This is a method in which the magnetic head is used as a disk and the servo information of the servo disk is used to position the magnetic head on another data disk.
又最近の磁気ディスク装置ではヘッド位置決め精度を上
げるためにデータ面サーボ方式が種々検討されている。Furthermore, in recent magnetic disk drives, various data surface servo systems are being studied in order to improve head positioning accuracy.
データ面サーボ方式の中、一方はセクターサーボ方式で
あり、他方はベリードサーボ方式である。セクターサー
ボ方式はデータ面をセクターに分け、そのセクターの一
部分にサーボ情報をあらかじめ記録しておく方式であり
、ベリードサーボ方式は磁気ディスクの磁性媒体を上層
と下層に分けて、上層にデータ情報を、下層にサーボ情
報を記録して、その下層のサーボ情報によりヘッドの位
置決めを行なう方式である。′次にフレキシブル磁気デ
ィスク装置はステ・ツブモータ等を用いてサーボコント
ロールを行なわない方式が大部分である。しがしながら
高線密度が進むにつれて、１〜ラック密度を上げる必要
が生じ、現在セクターサーボ方式が用いられる様になっ
てきた。Among the data surface servo systems, one is the sector servo system and the other is the buried servo system. The sector servo method is a method in which the data surface is divided into sectors and servo information is pre-recorded in some of the sectors.The buried servo method is a method in which the magnetic medium of the magnetic disk is divided into an upper layer and a lower layer, and data information is recorded in the upper layer. This is a method in which servo information is recorded in the lower layer and the head is positioned using the servo information in the lower layer. 'Next, most flexible magnetic disk drives do not use servo control using a step motor or the like. However, as the linear density progresses, it becomes necessary to increase the rack density by one to one, and the sector servo system is now being used.
（発明が解決しようとする問題点）
前記の従来の技術に示したサーボ面サーボ方式において
、サーボ用磁気ヘッドとデータ用磁気ヘッドが別々のデ
ィスク板上に配置されているために、ディスク間の周囲
温度の相違により熱膨張の差を生じ、ヘッド位置決め精
度を上げることが困難であるという問題点を有していた
。又セクターサーボ方式においては、１トラツクをセク
ターに分けて、部分的にサーボ情報を取り出すために、
サーボ情報が入力される部分以外はトラック・サーボが
出来ないという問題点を有していた。この問題点は特に
磁気ヘッドのシーク動作を高速で行なうときに顕在化し
、さらに高トラツク密度時にも大きな問題点となる。(Problems to be Solved by the Invention) In the servo surface servo method shown in the above-mentioned prior art, since the servo magnetic head and the data magnetic head are arranged on separate disk plates, The problem is that differences in ambient temperature cause differences in thermal expansion, making it difficult to improve head positioning accuracy. In addition, in the sector servo method, one track is divided into sectors, and in order to partially extract servo information,
There was a problem in that track servo was not possible in areas other than the area where servo information was input. This problem becomes particularly apparent when the magnetic head performs a seek operation at high speed, and also becomes a major problem when the track density is high.
フレキシブル磁気ディスク装置ではヘッドとディスクが
常に接触しているので、ヘッドは種々の方向に種々の力
を常に受けている。従ってセクターサーボ方式の様に間
欠的にサーボ情報を取り出す方式はセクターサーボ情報
の書かれていない領域ではサーボ情報を取り出すことが
出来ない為ヘッド位置決め精度に限界を生じるという問
題点を有していた。In a flexible magnetic disk device, the head and disk are always in contact with each other, so the head is constantly subjected to various forces in various directions. Therefore, a method such as the sector servo method that extracts servo information intermittently has the problem that servo information cannot be extracted in areas where sector servo information is not written, resulting in a limit to head positioning accuracy. .
次に近年注目されている垂直記録媒体をべり−ドサーボ
方式用磁気２重層ディスクとして用いた場合、従来の様
なリング型磁気ヘッドとの組み合わせにおいてはサーボ
情報がダイパルス波形となり、このダイパルス波形は高
調波成分を多く含む。ベリードサーボ方式においてサー
ボ情報が高調波成分を含むことはその分データ情報の信
号品質を劣化させるという問題点を有している９本発明
の目的は前述の問題点を改善した垂直磁気２重層ディス
クを用いた磁気ディスク装置を提供することにある。Next, when a perpendicular recording medium, which has been attracting attention in recent years, is used as a magnetic double layer disk for a curved servo system, when combined with a conventional ring-type magnetic head, the servo information becomes a dipulse waveform, and this dipulse waveform has a high pitch. Contains many wave components. In the buried servo system, if the servo information contains harmonic components, there is a problem that the signal quality of the data information is degraded. An object of the present invention is to provide a magnetic disk device using the present invention.
（問題点を解決するための手段）
本発明の磁気ディスク装置は非磁性基板上に非磁性層を
介して垂直磁気異方性を有する磁性膜を２層構造に形成
した垂直磁気２重層磁気ディスクと、磁気抵抗効果型磁
気ヘッドを含む磁気ヘッドを備えた磁気ディスク装置で
ある。すなわち垂直磁気２重層ディスクの下層磁性膜を
サーボ情報用とし、上層磁性膜をデータ情報用として用
いて、それらのデータ・サーボ情報を磁気抵抗効果型磁
気ヘッドにより再生し、そのサーボ及びデータ情報をフ
ィルタにより分離し、該サーボ情報により位置誤差信号
を作成し、該位置誤差信号によりアク千ユエータ（例え
ばボイスコイルモータ〉を制御し、磁気抵抗効果型磁気
ヘッドを所定のトラックに位置決めをする。(Means for Solving the Problems) The magnetic disk device of the present invention is a perpendicular magnetic double-layer magnetic disk in which a magnetic film having perpendicular magnetic anisotropy is formed in a two-layer structure on a non-magnetic substrate via a non-magnetic layer. This is a magnetic disk device equipped with a magnetic head including a magnetoresistive magnetic head. In other words, the lower magnetic film of the perpendicular magnetic double layer disk is used for servo information, and the upper magnetic film is used for data information.The data and servo information are reproduced by a magnetoresistive magnetic head, and the servo and data information are reproduced. A position error signal is created using the servo information, and an actuator (for example, a voice coil motor) is controlled by the position error signal to position the magnetoresistive magnetic head on a predetermined track.
本発明の磁気ヘッド位置決め方式に用いられる垂直磁気
２重層ディスクにおいて基板はアルミニウム合金基板上
にめっきされたＮｉＰを平面研摩したものやアルミニウ
ムを陽極酸化したアルマイト基板等のリジットディスク
用基板及びポリイミド、ポリエステル、ポリアミド等の
フレキシブル基板が適し、該基板上に形成されるサーボ
用磁性層にはバリウムフエライ■・の塗布型磁性膜、Ｃ
ｏＣｒ等のスパッタ膜や蒸着膜及びＣｏ−Ｎｉ−Ｍｒ−
Ｐ、 Ｃｏ−Ｎｉ−Ｍｎ−Ｒｅ−Ｐ等のめっき膜等が適
している。該サーボ用磁性層の上の非磁性層としては５
ｊ０２． Ａ Ｑ ２０３゜Ｃｕ、Ｔｉ等のスパッタ膜
やスピンコード膜が、該非磁性層の上のデータ用磁性層
としてはサーボ用磁性層の保磁力より小さい保磁力を有
するバリウムフェライトの塗布型磁性膜、ＣｏＣｒ等の
スパッタ膜や蒸着膜及びＣｏ−Ｎｉ−１４ｎ−Ｐ、Ｃｏ
−Ｎｉ−Ｍｎ−Ｒｅ−Ｐ等のめっき膜等が適している。In the perpendicular magnetic double-layer disk used in the magnetic head positioning method of the present invention, the substrate is made of a rigid disk substrate such as a surface-polished NiP plated on an aluminum alloy substrate or an alumite substrate made of anodized aluminum, or a rigid disk substrate such as polyimide or polyester. , a flexible substrate made of polyamide, etc. is suitable, and the servo magnetic layer formed on the substrate is a coated magnetic film of barium ferrite, C
Sputtered film or vapor deposited film such as oCr and Co-Ni-Mr-
Plating films such as P, Co-Ni-Mn-Re-P, etc. are suitable. The non-magnetic layer on the servo magnetic layer is 5
j02. A Q 203° Sputtered film or spin code film of Cu, Ti, etc. is used as a data magnetic layer on the non-magnetic layer to form a barium ferrite coated magnetic film having a coercive force smaller than that of the servo magnetic layer. Sputtered films and vapor deposited films such as CoCr, Co-Ni-14n-P, Co
A plating film such as -Ni-Mn-Re-P is suitable.
該データ用磁性層の上に５ｉ０２．ＡＱ ２０３．ＣＩ
等のスパッタ膜やスピンコード膜、Ｎｉ酸化膜、Ｃｏ−
Ｐ酸化膜等が用いられる。次に本発明に用いられる磁気
抵抗効果型磁気ヘッドはＡＱ ＴｉＣ，フェライト、等
の非磁性基板上に形成され、再生用ギャップを有するヨ
ーク材料にはＮｉＦｅ、センダスト等の結晶質軟磁性材
料やＣｏＺｒ。5i02. on the data magnetic layer. AQ 203. C.I.
etc., sputtered film, spin code film, Ni oxide film, Co-
A P oxide film or the like is used. Next, the magnetoresistive magnetic head used in the present invention is formed on a non-magnetic substrate such as AQ TiC or ferrite, and the yoke material having the reproduction gap is made of a crystalline soft magnetic material such as NiFe or Sendust, or CoZr. .
ＣｏＺｒＮｂ等の非晶質材料が用いられ、磁気抵抗効果
素子としてはＮｉＦｅ、ＮｉＣｏ等が適している。さら
に記録用エレメントはヨーク付磁気抵抗効果素子と同一
平面に形成し、磁極としては、ＮｉＦｅのメッキ膜やＣ
ｏＺｒ 、 ＣｏＺｒＮｂ 、センダスト、パーマロイ
、ＦｅＮ等のスパッタ膜等が適し、コイルはＣｕ、メッ
キ膜、Ｃｕ、Ａｕ、 ＡＱ等のスパッタ膜等が適してい
る。An amorphous material such as CoZrNb is used, and NiFe, NiCo, etc. are suitable as the magnetoresistive element. Furthermore, the recording element is formed on the same plane as the magnetoresistive element with a yoke, and the magnetic pole is made of NiFe plated film or C
Sputtered films of oZr, CoZrNb, sendust, permalloy, FeN, etc. are suitable, and for the coil, Cu, plated films, sputtered films of Cu, Au, AQ, etc. are suitable.
（作用）
本発明は垂直磁気２重層ディスクを用い、同一の磁気デ
ィスク面からサーボ情報を得ているのでサーボ面サーボ
方式の様に熱膨張による大きな磁気ヘッド位置決め誤差
はない。又常時サーボ情報が得られるために、常に磁気
ヘッドの位置を制御できるので、セクターサーボ方式の
様に制御出来ない部分を有していない。従ってフレキシ
ブル磁気ディスク装置の様に常に種々の方向に種々の力
を受けている場合でも、本発明を用いれば常にサーボ情
報が得られるために精度よい磁気ヘッド位置決めが可能
となる。(Function) Since the present invention uses a perpendicular magnetic double layer disk and obtains servo information from the same magnetic disk surface, there is no large magnetic head positioning error due to thermal expansion unlike in the servo surface servo system. Also, since servo information is always available, the position of the magnetic head can be controlled at all times, so unlike the sector servo system, there is no part that cannot be controlled. Therefore, even when a flexible magnetic disk device is always subjected to various forces in various directions, by using the present invention, accurate magnetic head positioning is possible because servo information can always be obtained.
さらに磁気抵抗効果型磁気ヘッドを用いているために、
サーボ層及びデータ層からのサーボ信号及びデータ信号
はインダクティブ型磁気ヘッドで再生した場合の様なダ
イパルス波形とならず、通常の単極性の孤立波とするこ
とが出来る為に、データ信号とサーボ信号を周波数軸上
で分離するベリードサーボ方式において、データ信号と
サーボ信号との干渉が軽減される。Furthermore, since a magnetoresistive magnetic head is used,
The servo signal and data signal from the servo layer and data layer do not have a dipulse waveform like when reproduced by an inductive magnetic head, but can be a normal unipolar solitary wave, so the data signal and servo signal In the buried servo method, which separates the signals on the frequency axis, interference between the data signal and the servo signal is reduced.
（実施例）
以下第１図に示す実施例により本発明の磁気ディスク装
置を説明する。(Embodiment) The magnetic disk device of the present invention will be explained below with reference to the embodiment shown in FIG.
ポリイミドのフレキシブルな基板１１の上に膜厚０．５
μｍのＣｏＣｒ垂直磁気記録媒体のサーボ層１０をスパ
ッタ法により形成し、該サーボ層の上に０．１μｒｎの
５ｉ０２スバ・ツタ膜の非磁性層９を形成した後、該非
磁性層の上に膜厚０．３μＩｎのＣｏＣｒ垂直記録媒体
のデータ層８をスパッタ法により形成し、さらに該デー
タ層８の上に０．０２μｍ（７）Ｓｉ０２スパツタ膜の
保護１１５！ ７を形成して、垂直磁気２重層ディスク
を製作した。A film with a thickness of 0.5
A servo layer 10 of a CoCr perpendicular magnetic recording medium with a thickness of μm is formed by sputtering, and a nonmagnetic layer 9 of a 0.1 μrn 5i02 spruce ivy film is formed on the servo layer. A data layer 8 of a CoCr perpendicular recording medium having a thickness of 0.3 .mu.In is formed by sputtering, and a 0.02 .mu.m (7) Si02 sputtered film is further formed on the data layer 8 for protection 115! 7 to fabricate a perpendicular magnetic double layer disk.
次に磁気ヘッド１は走行方向（垂直磁気記録媒体の円周
方向）に平行になるスライダー側面に記録用エレメント
２とヨーク付磁気抵抗効果素子６゜５とを有する構造の
ものを作製した。即ち磁気ヘッド１の基板としてＡ Ｑ
２０．、ＴｉＣのセラミック基板を用いて記録用エレ
メント２として従来のめっきパーマロイの磁極を形成し
、その記録再生ギャップを１．０μｍとし、再生用の磁
気抵抗効果素子５としては膜厚４０口λで蒸着法により
作製し、ヨーク６は、スパッタ法とイオンミリング法に
より形成した。ヨーク６の再生ギャップ１２は０．２μ
ｍとした９これらを加工、アッセンブリーしてフロッピ
ディスク用磁気ヘッドを作製した。以上の方法により作
製した磁気ヘッド１のトラック巾は記録用エレメント２
及びヨーク６の膜厚となり、本実施例ではその膜厚を３
μｍとした。以上の垂直磁気２重層ディスクとヨーク付
磁気抵抗効果型磁気ヘットを用いて磁気ヘッドの位置決
めを行なった。Next, a magnetic head 1 having a structure having a recording element 2 and a yoke-equipped magnetoresistive element 6.5 on the side surface of a slider parallel to the running direction (circumferential direction of the perpendicular magnetic recording medium) was manufactured. That is, as the substrate of the magnetic head 1, AQ
20. A conventional plated permalloy magnetic pole was formed as the recording element 2 using a TiC ceramic substrate, and the recording/reproducing gap was set to 1.0 μm, and the magnetoresistive element 5 for reproduction was deposited with a film thickness of 40 μm. The yoke 6 was formed by a sputtering method and an ion milling method. The reproduction gap 12 of the yoke 6 is 0.2μ
A magnetic head for a floppy disk was fabricated by processing and assembling these pieces. The track width of the magnetic head 1 manufactured by the above method is the recording element 2
and the film thickness of the yoke 6, and in this embodiment, the film thickness is 3
It was set as μm. The magnetic head was positioned using the perpendicular magnetic double layer disk and the yoke-equipped magnetoresistive magnetic head.
即ち該磁気ヘッド１を磁気ヘッド用アームにより磁気ヘ
ッド位置決めモータに接続し、該磁気抵抗効果素子５に
より再生されたサーボ及びデータ信号をフィルタ回路に
よりデータ及びサーボ信号にそれぞれ分離し、その分離
されたサーボ信号より位置誤差信号を作成し、該位置誤
差信号を用いて、前記磁気ヘッド位置決めモータを制御
することにより磁気ヘッドの位置決めを行なった。That is, the magnetic head 1 is connected to a magnetic head positioning motor by a magnetic head arm, and the servo and data signals reproduced by the magnetoresistive element 5 are separated into data and servo signals by a filter circuit, and the separated A position error signal was created from the servo signal, and the magnetic head was positioned using the position error signal to control the magnetic head positioning motor.
（発明の効果）
本発明の垂直磁気２重層ディスクな用いた磁気へ・ソド
位置決め方式は磁気抵抗効果型磁気ヘッドにより再生し
ているために、サーボ信号の再生波形はリンク型磁気へ
・ソドによる再生波形の様にダイパルス波形とはならず
、高調波成分が少ないためにデータ信号の信号品質を劣
化させることかなかった。さらに同一のディスク面、同
一トラ・ツク上からサーボ情報を得るために熱膨張によ
る位置決め誤差は非常に小さく、常時サーボ情報を得る
ことができるために高速動作時及び高トラツク密度時の
位置決め精度は±０．ＩＪｔｍとなり、非常に高精度と
なった。本発明により従来のサーボ無しサーボ面サーボ
方式及び、セクターサーボ方式が有する問題点をすべて
解決することができた。本発明を用いて、トう・ツク密
度５０００ＴＰＩが可能となった。(Effects of the Invention) Since the perpendicular magnetic double layer disk of the present invention uses a magnetic positioning method that uses a magnetoresistive magnetic head for reproduction, the reproduced waveform of the servo signal is determined by the link type magnetic field. Unlike the reproduced waveform, the waveform did not become a dipulse waveform, and since there were few harmonic components, the signal quality of the data signal did not deteriorate. Furthermore, since servo information is obtained from the same disk surface and the same track, positioning errors due to thermal expansion are extremely small, and since servo information can be obtained at all times, positioning accuracy during high-speed operation and high track density is ±0. IJtm, resulting in extremely high accuracy. The present invention has solved all the problems of the conventional servo-less servo surface servo system and sector servo system. Using the present invention, a tow density of 5000 TPI has become possible.
第１図は本発明の磁気ディスク装置の一例を示す概略図
。FIG. 1 is a schematic diagram showing an example of a magnetic disk device of the present invention.
Claims (1)
る２つの垂直磁気異方性を有する磁性層が形成された磁
気ディスクと、磁気抵抗効果型ヘッドを含む磁気ヘッド
とを備えたことを特徴とする磁気ディスク装置。It is characterized by comprising a magnetic disk on which two magnetic layers having perpendicular magnetic anisotropy are formed, each serving as a data layer and a servo layer, with a nonmagnetic layer interposed therebetween, and a magnetic head including a magnetoresistive head. magnetic disk device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14054986A JPS62298016A (en) | 1986-06-16 | 1986-06-16 | Magnetic disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14054986A JPS62298016A (en) | 1986-06-16 | 1986-06-16 | Magnetic disk device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62298016A true JPS62298016A (en) | 1987-12-25 |
Family
ID=15271256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14054986A Pending JPS62298016A (en) | 1986-06-16 | 1986-06-16 | Magnetic disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62298016A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03142707A (en) * | 1989-10-27 | 1991-06-18 | Hitachi Ltd | Positioning system for discrete medium and magnetic storage |
-
1986
- 1986-06-16 JP JP14054986A patent/JPS62298016A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03142707A (en) * | 1989-10-27 | 1991-06-18 | Hitachi Ltd | Positioning system for discrete medium and magnetic storage |
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