JP2525223B2 - Thin film head - Google Patents
Thin film headInfo
- Publication number
- JP2525223B2 JP2525223B2 JP63101561A JP10156188A JP2525223B2 JP 2525223 B2 JP2525223 B2 JP 2525223B2 JP 63101561 A JP63101561 A JP 63101561A JP 10156188 A JP10156188 A JP 10156188A JP 2525223 B2 JP2525223 B2 JP 2525223B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- thin film
- magnetic pole
- track width
- film head
- 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 - Lifetime
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/3116—Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、例えば磁気ディスク装置、磁気テープ装
置、ビデオテープレコーダ装置等に用いられる磁気ヘッ
ドに関し、特にオフトラック特性を向上した薄膜ヘッド
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in, for example, a magnetic disk device, a magnetic tape device, a video tape recorder device, etc., and more particularly to a thin film head with improved off-track characteristics.
（従来の技術） 従来の薄膜ヘッドは第１図の１と２により構成される
凸部から離れた部分でかつ中心部分で図には示してない
が２枚の磁性膜をコイルを挟んで結合した磁極部の形状
を第１図に示す。１は該凸部の長さで磁気記録媒体（以
下媒体という。）上に信号の記録されているトラック幅
を示し、２は該トラック幅を精度良く実現する為の長方
形部分の奥行きを示し、３は磁極部に発生する磁壁の内
最も媒体面に近い180度磁壁の長さである。従来の薄膜
ヘッドの設計においては３の長さが正である領域におい
てはトラック幅に対応する１の長さはヘッドの技術的限
界とはならなかった。２の長さはヘッドを研磨加工する
際の較差で決定されるものである。３の長さはヘッドの
効率を決めるもっとも大きな要因であった。１の長さが
２の長さより長い系においては十分に長い３の長さが確
保されるため、媒体対向部における磁極部の形状は問題
にならなかった。(Prior Art) In a conventional thin film head, two magnetic films are coupled with a coil sandwiched between them, although not shown in the figure at a portion apart from a convex portion constituted by 1 and 2 in FIG. 1 and at a central portion. The shape of the magnetic pole portion is shown in FIG. Reference numeral 1 denotes the length of the convex portion, which indicates a track width on which a signal is recorded on a magnetic recording medium (hereinafter referred to as medium), and 2 indicates the depth of a rectangular portion for realizing the track width with high precision. 3 is the length of the 180 degree domain wall closest to the medium surface among the domain walls generated in the magnetic pole portion. In the conventional thin film head design, the length of 1 corresponding to the track width in the region where the length of 3 is positive was not the technical limit of the head. The length of 2 is determined by the difference in polishing the head. The length of 3 was the biggest factor in determining the efficiency of the head. In the system in which the length of 1 is longer than the length of 2, a sufficiently long length of 3 is ensured, so the shape of the magnetic pole portion in the medium facing portion does not matter.
なお、従来の技術に関する文献としてつぎのものがあ
る。The following documents are related to conventional techniques.
1. 光岡、佐野、成重、華園、杉田“薄膜磁気ヘッド用
パーマロイ膜の磁区構造”、第10回応用磁気学会学術講
演概要集、1986年11月、6aA−６ 2. J.Kishigami,T,Mikazuki and Y.Koshimoto,“Analy
sis of Magnetic Domains in a Film Head",IEEE Tran
s.Magn.,MAG−22,p.1840,（1986） 3. 伊藤、岸上、越本「狭トラック薄膜ヘッドの記録再
生特性」昭和63年電子情報通信学会春季全国大会、Ｃ−
6,1988 （発明が解決しようとする課題） しかし、磁気ディスクシステムの高密度化などにより
ヘッドに対する要求が狭トラック化するにつれ１の長さ
が短くなりそれに伴い磁極部の設計においては３の長さ
が確保できないという問題点が出てきた。第２図は掛か
る条件において従来の設計で考えられる磁極部形状の一
例であるが、該磁極部に発生するドメインにおいては図
２の４で示す磁壁が観測され180度磁壁の連続により高
周波における磁束を伝達していた系と違い、媒体に最も
近い位置において180度磁壁が該180度磁壁の向いている
方向と90度変わることによる出力変動、再生波形の歪な
どの問題があった。通常の単層のNiFe磁性膜の場合、７
μｍ以下のトラック幅では第２図の磁区形状になって記
録再生効率が低下すると共に分解能が大幅に劣化すると
云う問題があった。1. Mitsuoka, Sano, Narishige, Kaen, Sugita “Magnetic domain structure of permalloy film for thin film magnetic head”, Proc. Of the 10th Japan Society for Applied Magnetics, November 1986, 6aA-6 2. , Mikazuki and Y. Koshimoto, “Analy
sis of Magnetic Domains in a Film Head ", IEEE Tran
s.Magn., MAG-22, p.1840, (1986) 3. Ito, Kishigami, Koshimoto "Recording and reproducing characteristics of narrow track thin film head" 1988 IEICE Spring National Convention, C-
6,1988 (Problems to be solved by the invention) However, as the demand for the head becomes narrower due to the higher density of the magnetic disk system and the like, the length of 1 becomes shorter. However, there is a problem in that FIG. 2 shows an example of the shape of the magnetic pole portion that can be considered in the conventional design under the applied conditions. In the domain generated in the magnetic pole portion, the domain wall indicated by 4 in FIG. Unlike the system in which the magnetic field was transmitted, there were problems such as output fluctuation and reproduction waveform distortion due to the 180 degree domain wall changing by 90 degrees from the direction in which the 180 degree domain wall is facing at the position closest to the medium. In the case of a normal single-layer NiFe magnetic film, 7
When the track width is less than .mu.m, there is a problem that the magnetic domain shape shown in FIG.
本発明は上記の問題点を解決するためになされたもの
で、数μｍ以下のトラック幅を有する薄膜ヘッドにて安
定した良好な記録再生を行うことが目的である。The present invention has been made to solve the above problems, and an object thereof is to perform stable and good recording / reproducing with a thin film head having a track width of several μm or less.
（課題を解決するための手段） ２枚の磁性膜が磁気記録媒体のトラック幅に対応する
対向面を有し、該対向面から離れた部分でコイルを挟ん
で結合し磁極を形成する薄膜ヘッドにおいて、 前記対向面の幅をトラツク幅７μｍ以下に対応させ、
該対向面を前記磁極のヨーク部の端部に設けた 部上に
形成し、該凸部を前記２枚の磁性膜が結合する方向への
奥行き寸法が前記トラツク幅より僅かに短く、かつ、前
記磁性膜厚より短く、前記凸部のトラツク幅方向の両側
が前記磁極のヨーク部の端部に向かつて外方向に傾斜
し、前記対向面となす角度が鈍角となるように接合して
形成する。(Means for Solving the Problem) Two thin film heads each having a facing surface corresponding to the track width of a magnetic recording medium, and forming a magnetic pole by interposing a coil at a portion distant from the facing surface and forming a magnetic pole. In, the width of the facing surface is made to correspond to a track width of 7 μm or less,
The facing surface is formed on a portion provided at an end portion of the yoke portion of the magnetic pole, and the convex portion has a depth dimension in a direction in which the two magnetic films are coupled to each other, which is slightly shorter than the track width, and Shorter than the magnetic film thickness, both sides of the convex portion in the track width direction are inclined outward toward the end of the yoke portion of the magnetic pole, and are joined so that the angle formed with the facing surface is an obtuse angle. To do.
（作用） 本発明は前記の様に構成したので、従来の薄膜ヘッド
では実現不可能なトラック幅2.2μｍ程度の記録再生に
ついても、本発明を用い、磁極膜厚３μｍ、ギャップ長
0.5μｍのヘッドにおいて凸部奥行き1.5μｍとしたヘッ
ドで実験した結果、第５図に示すように全く分解能の低
下しないヘッドが得られている。本図においてトラック
幅2.2μｍの方が出力が上がっているのは実効的なトラ
ック幅が広がったためである。(Operation) Since the present invention is configured as described above, the present invention is also used for recording / reproducing with a track width of about 2.2 μm, which cannot be realized by the conventional thin film head.
As a result of an experiment with a head having a projection depth of 1.5 μm in a 0.5 μm head, a head having no deterioration in resolution was obtained as shown in FIG. In the figure, the track width of 2.2 μm increases the output because the effective track width has expanded.
（実施例） 以下、図面を用いた本発明の実施例に沿ってその動作
を説明する。(Embodiment) The operation will be described below according to an embodiment of the present invention with reference to the drawings.
第３図は、本発明の一実施例に係わる薄膜ヘッドの磁
極部形状と、該磁極部に発生するドメイン形状を示した
図で、該薄膜ヘッドにおいては媒体対向面に最も近い媒
体対向面に突き出した凸部と、いわゆるバドミントンラ
ケット状のヨーク部が接合され、接合部において該凸部
の幅よりヨーク部の幅が広い。第３図に示すように、媒
体後部に90度磁壁が発生していないから、該磁極を用い
た薄膜ヘッドの効率が高いことは従来例の説明より明か
である。第４図に本発明による薄膜ヘッドの磁極部凸部
に発生するドメインおよび各ドメイン内の磁化の向きを
示している。本発明では第４図に示す形状において、媒
体対向部の凸部のトラック幅方向の長さ（トラック幅）
に比し該奥行きの長さが短い磁極部形状とし、かつその
奥行きの寸法をトラック幅以下でかつ磁極膜厚以下とす
る。この様にすれば、凸部側壁部に発生する磁化は第４
図に示すようにギャップを介して対向する２枚の磁極間
で中和され、該部分に発生する静磁エネルギーが大幅に
低下するから、磁性膜内に90度磁壁を構成する必要がな
くなって第４図に示すような磁区形状が構成できる。FIG. 3 is a diagram showing a magnetic pole portion shape of a thin film head according to an embodiment of the present invention and a domain shape generated in the magnetic pole portion. In the thin film head, the medium facing surface closest to the medium facing surface is shown. The protruding protrusion is joined to the so-called badminton racket-shaped yoke, and the width of the yoke is wider than the width of the protrusion at the joint. As shown in FIG. 3, since the 90 degree domain wall is not generated in the rear part of the medium, the efficiency of the thin film head using the magnetic pole is higher than that of the conventional example. FIG. 4 shows the domains generated in the convex portions of the magnetic pole portion of the thin film head according to the present invention and the direction of magnetization in each domain. In the present invention, in the shape shown in FIG. 4, the length of the convex portion of the medium facing portion in the track width direction (track width)
The depth of the magnetic pole portion is shorter than that of the magnetic pole, and the dimension of the depth is less than the track width and less than the magnetic pole film thickness. By doing so, the magnetization generated on the side wall of the convex portion is
As shown in the figure, it is neutralized between two magnetic poles facing each other through a gap, and the magnetostatic energy generated in that portion is significantly reduced, so there is no need to form a 90-degree domain wall in the magnetic film. A magnetic domain shape as shown in FIG. 4 can be formed.
第４図に示す磁極部を有する薄膜ヘッドの記録再生動
作において最も大きな問題となると予想されるのは磁極
部の凸部以外の磁極対向部におけるクロストークであ
る。しかし該磁極対向部における空域をギャップ部にお
ける空域に比し数倍にすることにより使用信号周波数に
おいて該磁極対向部における感度を十分に小さくするこ
とができるものである。It is expected that the biggest problem in the recording / reproducing operation of the thin film head having the magnetic pole portion shown in FIG. 4 is crosstalk in the magnetic pole facing portion other than the convex portion of the magnetic pole portion. However, by making the air space in the magnetic pole facing portion several times larger than the air space in the gap portion, it is possible to sufficiently reduce the sensitivity in the magnetic pole facing portion at the used signal frequency.
（発明の効果） 以上説明したように、本発明によれば媒体面に対向す
る磁極部を所定の寸法の凸部を有する形状にすることに
より、高感度・高分解能な狭トラック幅ヘッドが簡単に
実現できるから磁気記録装置の大幅な高トラック密度化
が可能となる。(Effect of the Invention) As described above, according to the present invention, a narrow track width head with high sensitivity and high resolution can be easily formed by forming the magnetic pole portion facing the medium surface into a shape having a convex portion of a predetermined size. Therefore, the track density of the magnetic recording device can be significantly increased.
第１図は従来の薄膜ヘッドに用いられていた磁極部の平
面図、 第２図は従来の狭トラック幅ヘッドを実現したドメイン
形状を示す平面図、 第３図は本発明の一実施例における薄膜ヘッドの磁極部
形状及び該磁極部に発生するドメイン形状を示す平面
図、 第４図は、第３図に示した磁極部のドメイン及磁化の向
きを示す斜視図、 第５図は、本発明を用いた薄膜ヘッドの記録再生特性
図。 １……凸部の長さ、２……凸部の奥行きの長さ、３……
180度磁壁の長さ、４……媒体対抗面に最も近い180度磁
壁の長さ、５……ドメイン内の磁化の向き、６……側面
方向に漏れる磁束、７……凸部に置ける磁化の向き、８
……２つの凸部の距離、９……磁壁（二点鎖線で示した
もの）。FIG. 1 is a plan view of a magnetic pole portion used in a conventional thin film head, FIG. 2 is a plan view showing a domain shape which realizes a conventional narrow track width head, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a plan view showing the shape of a magnetic pole portion of a thin film head and a domain shape generated in the magnetic pole portion. FIG. 4 is a perspective view showing the domain and magnetization direction of the magnetic pole portion shown in FIG. FIG. 6 is a recording / reproducing characteristic diagram of a thin film head using the invention. 1 ... Convex length, 2 ... Convex depth, 3 ...
Length of 180 degree domain wall, 4 ... Length of 180 degree domain wall closest to the medium facing surface, 5 ... Direction of magnetization in domain, 6 ... Magnetic flux leaking in lateral direction, 7 ... Magnetization that can be placed on convex portion Orientation, 8
...... Distance between two convex portions, 9 ... Domain wall (shown by a chain double-dashed line).
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭59−139119（ＪＰ，Ａ) 特開 昭62−229511（ＪＰ，Ａ) 特開 昭63−298808（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-59-139119 (JP, A) JP-A-62-229511 (JP, A) JP-A-63-298808 (JP, A)
Claims (1)
に対応する対向面を有し、該対向面から離れた部分でコ
イルを挟んで結合し、磁極を形成する薄膜ヘッドにおい
て、 前記対向面の幅をトラツク幅７μｍ以下に対応させ、該
対向面を前記磁極のヨーク部の端部に設けた凸部上に形
成し、該凸部を前記２枚の磁性膜が結合する方向への奥
行き寸法が前記トラツク幅より僅かに短く、かつ、前記
磁性膜厚より短く、前記凸部のトラツク幅方向の両側が
前記磁極のヨーク部の端部に向かつて外方向に傾斜し、
前記対向面となす角度が鈍角となるように接合して形成
してなるこを特徴とする薄膜ヘッド。1. A thin film head in which two magnetic films have opposing surfaces corresponding to the track width of a magnetic recording medium, and a coil is sandwiched at a portion apart from the opposing surfaces to form a magnetic pole. The width of the facing surface is made to correspond to a track width of 7 μm or less, the facing surface is formed on a convex portion provided at the end of the yoke portion of the magnetic pole, and the convex portion is formed in a direction in which the two magnetic films are coupled. The depth dimension of the track is slightly shorter than the track width, and is shorter than the magnetic film thickness, and both sides of the protrusion in the track width direction are inclined outward toward the end of the yoke part of the magnetic pole,
A thin film head, characterized in that the thin film head is formed by joining the surfaces so as to form an obtuse angle with the facing surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63101561A JP2525223B2 (en) | 1988-04-25 | 1988-04-25 | Thin film head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63101561A JP2525223B2 (en) | 1988-04-25 | 1988-04-25 | Thin film head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01271906A JPH01271906A (en) | 1989-10-31 |
| JP2525223B2 true JP2525223B2 (en) | 1996-08-14 |
Family
ID=14303828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63101561A Expired - Lifetime JP2525223B2 (en) | 1988-04-25 | 1988-04-25 | Thin film head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2525223B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000105907A (en) | 1998-07-30 | 2000-04-11 | Tdk Corp | Thin film magnetic head and manufacture thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59139119A (en) * | 1983-01-25 | 1984-08-09 | Seiko Epson Corp | Magnetic head |
| JPS62229511A (en) * | 1986-03-31 | 1987-10-08 | Hitachi Ltd | Thin film magnetic head |
| JPS63298808A (en) * | 1987-05-29 | 1988-12-06 | Fujitsu Ltd | Thin film magnetic head |
-
1988
- 1988-04-25 JP JP63101561A patent/JP2525223B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01271906A (en) | 1989-10-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |