JPH0560166B2 - - Google Patents
Info
- Publication number
- JPH0560166B2 JPH0560166B2 JP23654486A JP23654486A JPH0560166B2 JP H0560166 B2 JPH0560166 B2 JP H0560166B2 JP 23654486 A JP23654486 A JP 23654486A JP 23654486 A JP23654486 A JP 23654486A JP H0560166 B2 JPH0560166 B2 JP H0560166B2
- Authority
- JP
- Japan
- Prior art keywords
- servo
- track
- magnetic
- thin film
- data
- 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.)
- Expired - Fee Related
Links
- 239000010409 thin film Substances 0.000 claims description 31
- 239000000758 substrate Substances 0.000 claims description 9
- 239000010408 film Substances 0.000 description 25
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 9
- 230000005415 magnetization Effects 0.000 description 8
- 238000004544 sputter deposition Methods 0.000 description 8
- 238000000992 sputter etching Methods 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229910000889 permalloy Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 101000606504 Drosophila melanogaster Tyrosine-protein kinase-like otk Proteins 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229910000702 sendust Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000007740 vapor deposition 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
-
- 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
- G11B5/3103—Structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing
-
- 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
- G11B5/3176—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps
- G11B5/3179—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps the films being mainly disposed in parallel planes
- G11B5/3183—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps the films being mainly disposed in parallel planes intersecting the gap plane, e.g. "horizontal head 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、磁気デイスク装置、磁気テープ装
置、フレキシブルデイスク装置などに用いられる
薄膜磁気ヘツドに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thin film magnetic head used in magnetic disk devices, magnetic tape devices, flexible disk devices, and the like.
近年、磁気デイスク装置の高密度化が着実に向
上している。そして高トラツク密度化が徐徐に進
行している。従来の磁気デイスク装置のトラツク
ピツチは磁気ヘツドのトラツク幅より大きく、一
つのトラツクと隣接トラツクとの間にガードバン
ドと称するデータが記録されていない部分が存在
する。このガードバンドの幅は隣接するトラツク
間のオフトラツク特性や磁気ヘツドの位置決め誤
差などを考慮して決定される。高トラツク密度に
なるに従つて薄膜ヘツドのトラツク幅は小さくな
り、その分データ信号の振幅は小さくなり、デー
タ信号のＳ／Ｎ比は小さくなるので、信頼性が劣
化する。薄膜磁気ヘツドが狭トラツク幅になるに
つれて、トラツクピツチに占めるガードバンドの
割合は大きくなつてきた。又、現在までに提案さ
れているベリードサーボ方式では隣接するデータ
信号磁化の方向が同一方向である為に相互の干渉
が大きく、ガードバンドを０にすることが出来な
かつた。
In recent years, the density of magnetic disk devices has steadily increased. And track density is gradually increasing. The track pitch of a conventional magnetic disk device is larger than the track width of a magnetic head, and there is a portion called a guard band where no data is recorded between one track and an adjacent track. The width of this guard band is determined in consideration of off-track characteristics between adjacent tracks, positioning error of the magnetic head, etc. As the track density increases, the track width of the thin film head becomes smaller, the amplitude of the data signal becomes smaller, and the S/N ratio of the data signal becomes smaller, resulting in a decrease in reliability. As the track width of thin film magnetic heads becomes narrower, the proportion of the guard band in the track pitch becomes larger. Furthermore, in the buried servo systems that have been proposed up to now, since the magnetization directions of adjacent data signals are in the same direction, mutual interference is large and it is not possible to set the guard band to zero.
前述のように従来の磁気デイスク装置の薄膜磁
気ヘツドでは、高トラツク密度化につれて、薄膜
磁気ヘツドのトラツク幅が小さくなり、トラツク
ピツチに占めるガードバンドの幅が大きくなり、
薄膜磁気ヘツドの再生出力やSNRはその分劣化
し、磁気ヘツドのトラツク位置決め精度は劣化す
るという問題があつた。
As mentioned above, in the thin film magnetic head of a conventional magnetic disk device, as the track density increases, the track width of the thin film magnetic head becomes smaller, and the width of the guard band occupying the track pitch becomes larger.
There was a problem in that the reproduction output and SNR of the thin film magnetic head deteriorated accordingly, and the track positioning accuracy of the magnetic head deteriorated accordingly.
本目的は上記問題点を改善したベリードサーボ
方式用薄膜磁気ヘツドを提供することにある。 The object of the present invention is to provide a thin film magnetic head for a buried servo system which improves the above-mentioned problems.
本発明のベリードサーボ方式用薄膜磁気ヘツド
は、非磁性基板のスライダーと、このスライダー
の側面に設けられたサーボ再生用エレメントと、
前記側面に設けられそれぞれのギヤツプが前記サ
ーボ再生用エレメントのギヤツプと45度の角度を
なして互いのギヤツプが90度の角度をなす２つの
データ記録再生用エレメントとを含んで構成され
る。
The buried servo type thin film magnetic head of the present invention includes a slider made of a non-magnetic substrate, a servo reproduction element provided on the side surface of the slider,
The device includes two data recording and reproducing elements provided on the side surface, each gap forming an angle of 45 degrees with the gap of the servo reproducing element, and the gaps forming an angle of 90 degrees with each other.
本発明のベリードサーボ方式用薄膜磁気ヘツド
はスライダーの側面に２つのデータ記録再生用薄
膜エレメントを配置し、該データ記録再生用薄膜
エレメントのギヤツプの方向はお互いに90度に角
度を有し、隣接するトラツクごとに２つのデータ
記録再生用薄膜エレメントが交互に用いられ、該
データ記録再生用薄膜エレメントのギヤツプの方
向に対して45度の方向を有した１つのサーボ記録
用薄膜エレメントによりサーボ信号を得るのに用
いられる。従つて隣接するトラツクに記録された
磁化遷移の方向はお互いに90度の角度を有する為
に、各トラツクのデータ信号再生時には隣接する
トラツクのデータ信号は再生されない。このよう
に隣接トラツクの磁化方向が90度だけ相違する
と、隣接トラツクのデータ信号の影響は無視出来
る為に隣接トラツク間のガードバンドを０にする
ことが出来る。又サーボ信号は同一側面上のサー
ボ再生用薄膜エレメントによりデータ信号と同一
トラツクのサーボ層より再生される。本薄膜磁気
ヘツドを位置決め精度が高いベリードサーボ方式
と合わせて、用いればガードバンドを０にするこ
とが出来るので、そのガード分だけデータ信号の
トラツク幅を大きく出来、その結果データ信号の
再生信号振幅やSNRを大きくすることが出来る。
The thin film magnetic head for buried servo system of the present invention has two thin film elements for data recording and reproducing arranged on the side surface of the slider, the gap directions of the thin film elements for data recording and reproducing are at an angle of 90 degrees to each other, and adjacent Two data recording/reproducing thin film elements are used alternately for each track, and a servo signal is obtained by one servo recording thin film element having a direction of 45 degrees with respect to the gap direction of the data recording/reproducing thin film element. used for. Therefore, since the directions of magnetization transitions recorded in adjacent tracks are at an angle of 90 degrees to each other, when data signals of each track are reproduced, data signals of adjacent tracks are not reproduced. When the magnetization directions of adjacent tracks differ by 90 degrees in this way, the influence of the data signals of the adjacent tracks can be ignored, so the guard band between adjacent tracks can be set to zero. Also, the servo signal is reproduced from the servo layer on the same track as the data signal by a thin film element for servo reproduction on the same side. If this thin-film magnetic head is used in conjunction with a buried servo system with high positioning accuracy, the guard band can be set to 0, so the track width of the data signal can be increased by the guard, and as a result, the reproduced signal amplitude of the data signal can be increased by the guard band. It is possible to increase the SNR.
以下、第一図に示す一実施例により本発明のベ
リードサーボ方式用薄膜磁気ヘツドを説明する。
The thin film magnetic head for buried servo system of the present invention will be explained below with reference to an embodiment shown in FIG.
非磁性基板２（AlTiC基板上にAl2O3膜をスパ
ツタ法で成膜し、該Al2O3膜を研磨した基板）の
側面に、コイル４，５の下側半分の3μmのCu膜
を電気めつき法及びイオンミリング法により形成
した後、コイル４，５の下側半分の上に0.5μmの
Al2O3膜をスパツタ法により形成した。該Al2O3
膜の上にNiFeからなる磁気抵抗効果素子１８を
蒸着及びイオンミリング法により形成し、磁気抵
抗効果素子１８の電極１９をスパツタ及びイオン
ミリング法により形成した後、磁極６，９及び１
７の半分を形成する為に膜厚10μmのパーマロイ
膜をスパツタ法により成膜し、イオンミリング法
によりギヤツプ７，８をそれぞれエツチング（角
度45度）し、ギヤツプ２５を垂直エツチング（90
度）した。 A 3 μm Cu film is placed on the side surface of the non-magnetic substrate 2 (a substrate on which an Al 2 O 3 film is formed by sputtering on an AlTiC substrate and the Al 2 O 3 film is polished) on the lower half of the coils 4 and 5. was formed by electroplating and ion milling, and then a 0.5μm layer was formed on the lower half of the coils 4 and 5.
An Al 2 O 3 film was formed by sputtering. The Al 2 O 3
A magnetoresistive element 18 made of NiFe is formed on the film by vapor deposition and ion milling, and an electrode 19 of the magnetoresistive element 18 is formed by sputtering and ion milling.
7, a permalloy film with a thickness of 10 μm was formed by a sputtering method, gaps 7 and 8 were etched (at an angle of 45 degrees) using an ion milling method, and gap 25 was etched vertically (at an angle of 90 degrees).
degree).
次に磁極６及び９の半分の上にギヤツプ７，８
にAl2O3膜を0.3μmだけスパツタ法及びイオンミ
リング法により形成した後、磁極６，９及び１７
の残りの半分の磁極１５，１６，１７を形成する
為に膜厚10μmのパーマロイ膜をスパツタ法によ
り成膜し、イオンミリング法により磁極１５，１
６及び１７の形状に加工した。その後、磁極６，
９，１５，１６，１７の上に絶縁層として0.5μm
のAl2O3膜を形成し、コイル４，５の上側半分を
該絶縁層Al2O3膜の上にスパツタ法により3μmの
Cu膜を成膜しイオンミリング法により形成した。
次にコイル４，５のリード線接続部分のみに電気
めつき法により膜厚10μmのCu膜を形成した。該
Cu膜のコイル端子を形成した後、膜厚30μmの
AlOの保護膜３をスパツタ法により形成した。こ
のように形成したウエーハをスライダー加工、研
磨して、非磁性基板２のようなスライダーの形状
に加工した後、ジンバル１等を取り付けてアツセ
ンブリーを行なつてベリードサーボ方式用薄膜磁
気ヘツドを作製した。 Next, gap 7, 8 is placed on top of half of magnetic poles 6 and 9.
After forming an Al 2 O 3 film of 0.3 μm by sputtering and ion milling, magnetic poles 6, 9 and 17 were
In order to form the remaining half of the magnetic poles 15, 16, 17, a permalloy film with a thickness of 10 μm was formed by a sputtering method, and the magnetic poles 15, 1 were formed by an ion milling method.
It was processed into shapes of 6 and 17. After that, magnetic pole 6,
0.5 μm as an insulating layer on 9, 15, 16, 17
An Al 2 O 3 film of 3 μm is formed on the insulating layer Al 2 O 3 film, and the upper half of the coils 4 and 5 is sputtered onto the insulating Al 2 O 3 film.
A Cu film was formed using the ion milling method.
Next, a Cu film with a thickness of 10 μm was formed only on the lead wire connecting portions of the coils 4 and 5 by electroplating. Applicable
After forming the coil terminal of Cu film, a film thickness of 30 μm was
A protective film 3 of AlO was formed by sputtering. The wafer thus formed was subjected to slider processing and polishing to form a slider shape similar to the nonmagnetic substrate 2, and then gimbals 1 and the like were attached and assembled to produce a thin film magnetic head for buried servo system.
磁極６，１５並びに９，１６からなる２つのデ
ータ記録再生エレメントのギヤツプの方向は、上
述のギヤツプ７，８の斜めエツチングにより互に
90度の角度をなし、それぞれのギヤツプは磁極１
７からなるサーボ再生エレメントのギヤツプと±
45度だけ相違する。 The directions of the gaps of the two data recording/reproducing elements consisting of the magnetic poles 6, 15 and 9, 16 are mutually controlled by the diagonal etching of the gaps 7, 8 mentioned above.
90 degree angle, each gap is magnetic pole 1
The gap and ± of the servo playback element consisting of 7
They differ by only 45 degrees.
磁極６および１５並びに９および１６からなる
２つのデータ記録再生用薄膜エレメントは非磁性
基板２の一側面、すなわち磁気ヘツドスライダー
の一側面にあるので、同一トラツク上にあり、こ
の２つのデータ記録再生用薄膜エレメントをトラ
ツクごとに交互に使用して（あるトラツクで磁極
６，１５からなるデータ記録再生用エレメントを
使用した時は、そのトラツクに隣接するトラツク
では磁極９，１６からなるデータ記録再生用エレ
メントを使用する。）データ信号の記録再生を行
なう。 The two data recording/reproducing thin film elements consisting of magnetic poles 6 and 15 and 9 and 16 are located on one side of the nonmagnetic substrate 2, that is, on one side of the magnetic head slider, so they are on the same track, and these two data recording/reproducing elements (When a data recording and reproducing element consisting of magnetic poles 6 and 15 is used in a certain track, a data recording and reproducing element consisting of magnetic poles 9 and 16 is used in the adjacent track.) (Using elements.) Performs recording and playback of data signals.
このようにすることにより磁気デイスク上の隣
接するトラツクの記録磁化の方向はお互に90度を
なし、前述のガードバンドを０にして記録再生を
行なうことが出来る。ガードバンドを０に出来る
理由は２つのデータ記録再生用エレメントのギヤ
ツプの相対的角度が90度となつている為に一方の
データ記録再生用薄膜エレメントで１つのトラツ
クのデータ信号を再生するとき、隣接する両側の
トラツクからのデータ信号磁束は90度だけ方向が
ずれているので前述の一方のデータ記録再生用エ
レメントには再生出力として現われず、オントラ
ツクのデータ信号だけが再生されることになるた
めである。 By doing this, the recording magnetization directions of adjacent tracks on the magnetic disk are at 90 degrees to each other, and recording and reproduction can be performed with the aforementioned guard band set to 0. The reason why the guard band can be set to 0 is that the relative angle of the gap between the two data recording and reproducing elements is 90 degrees, so when one track's data signal is reproduced with one data recording and reproducing thin film element, Since the data signal magnetic fluxes from the adjacent tracks on both sides are deviated in direction by 90 degrees, they do not appear as playback output on one of the data recording/playback elements mentioned above, and only the data signal of the on-track is played back. It is.
又、このとき磁気ヘツドの位置決めは前述の２
つのデータ記録再生用薄膜エレメントと同一側面
上にある磁極１７からなる１つのサーボ再生用薄
膜エレメントの再生出力を用いて行なう。サーボ
再生用薄膜エレメントのギヤツプの方向は２つの
データ記録再生用薄膜エレメントのギヤツプの方
向と45度ずれており、サーボ信号はデイスクの円
周方向に磁化されているので、サーボ信号はデー
タ信号により影響を受けない。この為にサーボ信
号のSNRは向上し、その分磁気ヘツドの位置決
め精度は向上するので、ガードバンドを０に近ず
けることが出来る。 Also, at this time, the positioning of the magnetic head is performed in accordance with the above-mentioned 2.
This is performed using the reproduction output of one thin film element for servo reproduction, which is composed of the magnetic pole 17 on the same side as the thin film element for data recording and reproduction. The direction of the gap of the thin film element for servo reproduction is 45 degrees different from the direction of the gap of the two thin film elements for data recording and reproduction, and the servo signal is magnetized in the circumferential direction of the disk, so the servo signal is Not affected. For this reason, the SNR of the servo signal improves, and the positioning accuracy of the magnetic head improves accordingly, making it possible to bring the guard band closer to zero.
第１図において、本実施例のベリードサーボ方
式用薄膜磁気ヘツドを用いて、磁気デイスク１０
の上に、（ｎ−１）データトラツク１１、ｎデー
タトラツク１２、（ｎ＋１）データトラツク１３
の順にデータ記録した場合の磁化の状態を矢印で
示した。ここで（ｎ−１）データトラツク１１と
（ｎ＋１）データトラツク１３には磁極６，１５
でデータの記録再生がなされ、ｎデータトラツク
には磁極９，１６でデータの記録再生がなされ
た。又その時の磁気ヘツドの位置決めは磁極１７
及び磁気抵抗効果素子１８によりサーボ層のサー
ボトラツク２１，２２，２３，２４等から再生さ
れたサーボ信号によりなされた。 In FIG. 1, the thin film magnetic head for buried servo system of this embodiment is used to drive a magnetic disk 10.
On top of this, (n-1) data track 11, n data track 12, (n+1) data track 13
The arrows indicate the state of magnetization when data is recorded in this order. Here, (n-1) data track 11 and (n+1) data track 13 have magnetic poles 6, 15.
Data was recorded and reproduced using the magnetic poles 9 and 16 on the n data track. Also, the positioning of the magnetic head at that time is magnetic pole 17.
and servo signals reproduced from the servo tracks 21, 22, 23, 24, etc. of the servo layer by the magnetoresistive element 18.
なお、本発明のベリードサーボ方式用薄膜磁気
ヘツドに於いて、スライダー基板には、例えば
AlOTiC、SiCや非磁性フエライトが適し、側面
に形成される薄膜記録再生用エレメントの磁極に
は、例えばCoZr、CoTa、CoZrNb等の非晶質軟
磁性膜やパーマロイ、センダスト等の結晶質軟磁
性膜等が適し、又コイル及び電極には、例えば
Cu、Au、Al等のめつきやスパツタ膜が適し、こ
れらを保護する為の保護膜には、例えばAl2O3
膜、SiO2等のスパツタ膜が適している。 In addition, in the thin film magnetic head for buried servo system of the present invention, the slider substrate includes, for example,
AlOTiC, SiC, and non-magnetic ferrite are suitable.For the magnetic pole of the thin film recording/reproducing element formed on the side surface, for example, an amorphous soft magnetic film such as CoZr, CoTa, CoZrNb, or a crystalline soft magnetic film such as Permalloy or Sendust. etc. are suitable, and for coils and electrodes, e.g.
Plating or sputtering films of Cu, Au, Al, etc. are suitable, and protective films to protect them include, for example, Al 2 O 3
Film, sputtered film such as SiO 2 is suitable.
本発明のベリードサーボ方式用薄膜磁気ヘツド
は、スライダーの一側面、すなわち同一トラツク
上にギヤツプの角度が90度相違する２つの記録再
生エレメントと１つのサーボ再生用エレメントと
を有し、サーボ再生用エレメントにより再生され
たサーボ情報により薄膜磁気ヘツドをトラツクに
位置決めし、その状態で、２つの記録再生エレメ
ントをトラツクごとに交互に用いる。従つて隣接
するトラツクに記録されたデータ信号の磁化方向
はお互に90度の角度を有し、１つの記録再生エレ
メントで１つのトラツクを再生している時は隣接
するトラツクのデータ信号は再生されないので、
隣接トラツクとのガードバンドを０にすることが
出来る。
The buried servo type thin film magnetic head of the present invention has two recording/reproducing elements with gap angles different by 90 degrees and one servo reproducing element on one side of a slider, that is, on the same track. The thin film magnetic head is positioned on the track using the servo information reproduced by the servo information, and in this state, the two recording/reproducing elements are used alternately for each track. Therefore, the magnetization directions of data signals recorded on adjacent tracks are at an angle of 90 degrees to each other, and when one track is being reproduced by one recording/reproducing element, the data signals of adjacent tracks are not reproduced. So,
The guard band with adjacent tracks can be set to 0.
又磁気ヘツドな位置決めは同一トラツク上のサ
ーボ再生用エレメントにより磁気デイスクのサー
ボ層から再生されるサーボ信号を用いてなされ、
そのサーボ信号磁化はデータ信号磁化とは45度の
角度を有しているのでサーボ信号とデータ信号の
干渉がない為に、サーボ信号のＳ／Ｎは大きく取
れ、磁気ヘツド位置決めを高精度に出来る（実際
に製作したヘツドで位置決め精度を0.1μmに出来
た）。 Further, positioning of the magnetic head is performed using a servo signal reproduced from the servo layer of the magnetic disk by a servo reproduction element on the same track.
Since the servo signal magnetization has a 45 degree angle with the data signal magnetization, there is no interference between the servo signal and the data signal, so the S/N of the servo signal can be large and the magnetic head can be positioned with high accuracy. (We were able to achieve a positioning accuracy of 0.1μm with the actually manufactured head).
これらのことからデータ信号のトラツク幅をガ
ードバンド分だけ大きく出来る為に、再生される
データ信号振幅は従来のガードバンド分だけ増加
し、SNRも20〜30パーセント増加させることが
出来る。 For these reasons, the track width of the data signal can be increased by the amount of the guard band, so the amplitude of the reproduced data signal can be increased by the amount of the conventional guard band, and the SNR can also be increased by 20 to 30 percent.
第１図は本発明の一実施例のベリードサーボ方
式用薄膜磁気ヘツド（保護膜３を透視した状態で
示す）と磁気デイスク（一部破断）とを模式的に
示す斜視図である。
図において、１はジンバル、２は非磁性基板
（スライダー）、３は保護膜、４，５はコイル、
６，９，１５，１６はデータ記録再生用エレメン
トの磁極、７，８はギヤツプ、１０は磁気デイス
ク、１１は（ｎ−１）データトラツク、１２はｎ
データトラツク、１３は（ｎ＋１）データトラツ
ク、１４は磁性膜、１７はサーボ再生用エレメン
トの磁極、１８は磁気抵抗効果素子、１９は電
極、２５はサーボ再生用磁極のギヤツプ、２０は
サーボ層、２１は（ｎ−１）サーボトラツク、２
２はｎサーボトラツク、２３は（ｎ＋１）サーボ
トラツク、２４は（ｎ＋２）サーボトラツクであ
る。
FIG. 1 is a perspective view schematically showing a buried servo type thin-film magnetic head (shown with a protective film 3 seen through) and a magnetic disk (partially cut away) according to an embodiment of the present invention. In the figure, 1 is a gimbal, 2 is a non-magnetic substrate (slider), 3 is a protective film, 4 and 5 are coils,
6, 9, 15, 16 are magnetic poles of data recording/reproducing elements, 7, 8 are gaps, 10 is a magnetic disk, 11 is (n-1) data track, 12 is n
13 is a (n+1) data track, 14 is a magnetic film, 17 is a magnetic pole of a servo reproducing element, 18 is a magnetoresistive element, 19 is an electrode, 25 is a gap of a servo reproducing magnetic pole, 20 is a servo layer, 21 is (n-1) servo track, 2
2 is an n servo track, 23 is an (n+1) servo track, and 24 is an (n+2) servo track.
Claims (1)
の側面に設けられたサーボ再生用エレメントと、
前記側面に設けられそれぞれのギヤツプが前記サ
ーボ再生用エレメントのギヤツプと45度の角度を
なして互いのギヤツプが90度の角度をなす２つの
データ記録再生用エレメントとを含むことを特徴
とするベリードサーボ方式用薄膜磁気ヘツド。1. A slider made of a non-magnetic substrate, a servo playback element provided on the side of this slider,
A buried servo comprising two data recording and reproducing elements provided on the side surface, each gap forming an angle of 45 degrees with the gap of the servo reproducing element, and the gaps forming an angle of 90 degrees with each other. Thin-film magnetic head for the system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23654486A JPS6391817A (en) | 1986-10-03 | 1986-10-03 | Thin film magnetic head for buried servo-system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23654486A JPS6391817A (en) | 1986-10-03 | 1986-10-03 | Thin film magnetic head for buried servo-system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6391817A JPS6391817A (en) | 1988-04-22 |
| JPH0560166B2 true JPH0560166B2 (en) | 1993-09-01 |
Family
ID=17002239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23654486A Granted JPS6391817A (en) | 1986-10-03 | 1986-10-03 | Thin film magnetic head for buried servo-system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6391817A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6413213A (en) * | 1987-07-07 | 1989-01-18 | Hitachi Maxell | Magnetic recording system |
| US7317596B2 (en) * | 2005-06-21 | 2008-01-08 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic recording disk drive having read head with high cross-track resolution and disk with low bit-aspect-ratio |
| US8169743B2 (en) | 2007-07-20 | 2012-05-01 | Hitachi Global Storage Technologies, Netherlands B.V. | Minimizing slider vibration effects on a magnetic transducer |
-
1986
- 1986-10-03 JP JP23654486A patent/JPS6391817A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6391817A (en) | 1988-04-22 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |