JPH0278003A - Perpendicular recording magnetic head - Google Patents
Perpendicular recording magnetic headInfo
- Publication number
- JPH0278003A JPH0278003A JP63228627A JP22862788A JPH0278003A JP H0278003 A JPH0278003 A JP H0278003A JP 63228627 A JP63228627 A JP 63228627A JP 22862788 A JP22862788 A JP 22862788A JP H0278003 A JPH0278003 A JP H0278003A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- magnetic flux
- magnetic pole
- recording medium
- recording
- 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
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 14
- 230000004907 flux Effects 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 15
- 239000011810 insulating material Substances 0.000 abstract description 5
- 238000004804 winding Methods 0.000 abstract description 3
- 238000002513 implantation Methods 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
- 229910020012 Nb—Ti Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005292 diamagnetic effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000000059 patterning 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、高密度記録に好適な垂直記録磁気ヘッドに関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a perpendicular recording magnetic head suitable for high-density recording.
（従来の技術〕
垂直磁気記録においては、より高密度な記録を実現する
ために、磁気ヘッドから発生する磁界の垂直成分が強く
、かつ磁極での勾配が急峻であることが要求される。こ
れに関連した構造として、特開昭６０−１４３４１２号
公報に記載の磁気ヘッドが報告されており、これを第２
図に示す、この場合には、主磁極１の先端の両側面に非
磁性導電部材４を取付け、主磁極端部からの記録磁束の
拡がりを防止している。(Prior Art) In perpendicular magnetic recording, in order to achieve higher density recording, it is required that the perpendicular component of the magnetic field generated from the magnetic head be strong and that the gradient at the magnetic pole be steep. As a related structure, a magnetic head described in Japanese Patent Application Laid-Open No. 143412/1983 has been reported, and this is
In this case, as shown in the figure, non-magnetic conductive members 4 are attached to both sides of the tip of the main pole 1 to prevent the recording magnetic flux from spreading from the tip of the main pole.
しかるに上記従来技術は次の２点につき配慮がされてい
ない、第１は磁束集中効果が周波数依存性をもち、低周
波領域ではその効果が小さく適用範囲が制約される。こ
れは非磁性導電部材のうず電流シールド作用からくる本
質的なものである。However, the above-mentioned conventional technology does not take into account the following two points. First, the magnetic flux concentration effect has frequency dependence, and the effect is small in the low frequency region, limiting the range of application. This is essentially due to the eddy current shielding effect of the nonmagnetic conductive member.
第２は再生時の効率の低下であり、記録媒体から生じた
再生磁束に対し非磁性導電部材が反発力を与え、巻線部
に達する磁束量が減少するからである。The second reason is a decrease in efficiency during reproduction, because the nonmagnetic conductive member applies a repulsive force to the reproduction magnetic flux generated from the recording medium, and the amount of magnetic flux reaching the winding portion is reduced.
本発明の目的は、上記した従来技術の欠点をなくし、磁
束集中効果が周波数依存せず、再生効率も低下させない
垂直記録用磁気ヘッドを提供することである。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a magnetic head for perpendicular recording in which the magnetic flux concentration effect does not depend on frequency and the reproduction efficiency does not deteriorate.
上記目的は、主磁極の先端部に、超電導材コイルを巻回
したことにより達成される。この場合のコイル形状は、
主磁極先端に密着し取囲むような渦巻状のコイルが望ま
しい。The above object is achieved by winding a superconducting material coil around the tip of the main pole. In this case, the coil shape is
A spiral coil that closely contacts and surrounds the tip of the main pole is desirable.
超電導材はその臨界温度以下にて完全反磁性を示しくマ
イスナー効果）、記録時及び再生時の磁束の流入を完全
に遮断する。従って主磁極の周囲に超電導材を配置する
ことにより、記録再生磁束の経路を主磁極端部のみに限
定することになり、きわめて分解能の高い磁気ヘッドが
得られる。かつ上記マイスナー効果は周波数と無関係に
生じ。Superconducting materials exhibit complete diamagnetic properties below their critical temperature (Meissner effect), completely blocking the inflow of magnetic flux during recording and reproduction. Therefore, by arranging the superconducting material around the main pole, the path of the recording and reproducing magnetic flux is limited to only the tip of the main pole, and a magnetic head with extremely high resolution can be obtained. And the Meissner effect mentioned above occurs regardless of frequency.
低周波域でも同様に作用する。It works similarly in the low frequency range.
一方本発明では、上記超電導材が記録再生信号コイルを
兼用している。即ちコイルの位置は記録媒体に最も近接
しているので、特に再生時の磁束漏洩に伴う出力低下を
なくすことができる。On the other hand, in the present invention, the superconducting material also serves as a recording/reproducing signal coil. That is, since the coil is located closest to the recording medium, it is possible to eliminate a drop in output due to magnetic flux leakage, especially during reproduction.
以下本発明の実施例を第１図により説明す、る。 Embodiments of the present invention will be described below with reference to FIG.
（ａ）は本発明の垂直記録磁気ヘッドのＡ−Ａ ’断面
図、（ｂ）は平面図を示す。その構成は、主磁極１１と
これを挟む補助コア１２と超電導コイル１４からなる。(a) is a sectional view taken along the line AA' of the perpendicular recording magnetic head of the present invention, and (b) is a plan view thereof. Its structure consists of a main pole 11, an auxiliary core 12 sandwiching the main pole 11, and a superconducting coil 14.
超電導コイル１４は主磁極１１の先端すなわち記録媒体
１５に面した側に、平面スパイラル状に配置してあり、
コイル間隙は絶縁材１４で充てんしである。各部分の材
料と寸法は次の通りである。主磁極１１は、Ｇｏ−Ｎｂ
−Ｚｒ磁性薄膜で厚さ０．３μｍ、トラック幅２０μｍ
であり、補助コア１２はＭｎＺｎフェライトを用いた。The superconducting coil 14 is arranged in a planar spiral shape at the tip of the main pole 11, that is, on the side facing the recording medium 15.
The coil gap is filled with an insulating material 14. The materials and dimensions of each part are as follows. The main magnetic pole 11 is Go-Nb
-Zr magnetic thin film, thickness 0.3μm, track width 20μm
The auxiliary core 12 is made of MnZn ferrite.
超電導コイル１３はＮｂ−Ｔｉ合金薄膜をパターニング
して形成した。コイル厚１μｍ、コイル幅１０μｍ、コ
イル間隙１μｍ１巻数２０ターンとした。絶縁材１４に
は、アルミナ膜を用いて、記録媒体１５と対向するコイ
ル表面にも絶縁材の層を設けた。The superconducting coil 13 was formed by patterning an Nb-Ti alloy thin film. The coil thickness was 1 μm, the coil width was 10 μm, the coil gap was 1 μm, and the number of turns was 20. An alumina film was used as the insulating material 14, and an insulating material layer was also provided on the coil surface facing the recording medium 15.
次にその動作を説明する。超電導材Ｎｂ−Ｔｉを臨界温
度に保つため、ヘッド全体は液体ヘリウム（−２６９℃
）で冷却する。記録時には、超電導コイル１３で励磁さ
れた磁束は、すべて主磁極１１を通過して記録媒体１５
に向かう。超電導コイル１３はそれ自身マイスナー効果
を有するので磁束はここを通過できない、コイル間隙１
６は微小に設計し、かつ隣接コイルの磁界同志がここで
打消し合うので、コイル間隙１６からの磁束漏洩は微量
である１次に再生時の動作であるが、記録時と同様に超
電導コイル１３のマイスナー効果のため記録媒体１５か
らの再生磁束はすべて主磁極１１を通過する。この際超
電導コイル１３は主磁極１１の先端に配置しであるので
、主磁極の途中で磁束漏洩があったとしても、ヘッドに
向う磁束をほぼ１００％再生信号として取出すことがで
き、超電導材を採用したことによる出力低下は生じない
。上記マイスナー効果は渦電流効果とは本質的に異なり
、その磁束反発効果は周波数に依存せず常に存在する。Next, its operation will be explained. In order to maintain the superconducting material Nb-Ti at a critical temperature, the entire head is heated with liquid helium (-269°C
) to cool. During recording, all magnetic flux excited by the superconducting coil 13 passes through the main magnetic pole 11 and reaches the recording medium 15.
Head to. The superconducting coil 13 itself has a Meissner effect, so magnetic flux cannot pass through it, and the coil gap 1
6 is designed to be very small, and the magnetic fields of adjacent coils cancel each other out, so the magnetic flux leakage from the coil gap 16 is minute.This is the operation during primary reproduction, but the superconducting coil is used in the same way as during recording. All the reproducing magnetic flux from the recording medium 15 passes through the main magnetic pole 11 due to the Meissner effect of 13. At this time, since the superconducting coil 13 is placed at the tip of the main magnetic pole 11, even if there is magnetic flux leakage in the middle of the main magnetic pole, almost 100% of the magnetic flux toward the head can be extracted as a reproduced signal, and the superconducting material There is no reduction in output due to adoption. The Meissner effect is essentially different from the eddy current effect, and its magnetic flux repulsion effect always exists regardless of frequency.
従って本発明によれば低周波もしくは直流信号に対して
も有効に作用する。以上の動作により記録、再生時とも
に磁束を主磁極に集中できるので記録密度の点で分解能
を向上できる。Therefore, according to the present invention, it works effectively even on low frequency or DC signals. The above operation allows magnetic flux to be concentrated on the main pole during both recording and reproduction, thereby improving resolution in terms of recording density.
上記実施例では超電導材料としてＮｂ−Ｔｉ合金を用い
たため、液体ヘリウムによる冷却が必要となる。しかし
現在各研究機関に於て液体窒素温度、あるいはそれ以上
で動作可能なセラミクス超電導材料の報告がなされおり
、将来的には室温動作も期待されている。このような高
温動作形超電導材料を採用すれば１本発明の垂直記録磁
気ヘッドはより簡単な構成で安価に実現できることは明
らかである。In the above embodiment, since Nb-Ti alloy was used as the superconducting material, cooling with liquid helium is required. However, various research institutes are currently reporting ceramic superconducting materials that can operate at liquid nitrogen temperatures or higher, and room temperature operation is also expected in the future. It is clear that the perpendicular recording magnetic head of the present invention can be realized with a simpler structure and at lower cost by employing such a high temperature operating superconducting material.
以上述べたように本発明によれば、磁束集中効果が周波
数依存せず、再生効率も低下させない垂直記録用磁気ヘ
ッドを実現できる。As described above, according to the present invention, it is possible to realize a perpendicular recording magnetic head in which the magnetic flux concentration effect does not depend on frequency and the reproduction efficiency does not deteriorate.
第１図（、）は本発明の垂直記録磁気ヘッドの一実施例
の断面図、（ｂ）は同じく平面図、第２図は従来の垂直
記録磁気ヘッドの構成図である。
１１・・・主磁極、１２・・・補助コア、１３・・・超
電導コイル、１４・・・絶縁材、１５・・・記録媒体。1(a) is a sectional view of an embodiment of the perpendicular recording magnetic head of the present invention, FIG. 1(b) is a plan view thereof, and FIG. 2 is a configuration diagram of a conventional perpendicular recording magnetic head. DESCRIPTION OF SYMBOLS 11... Main magnetic pole, 12... Auxiliary core, 13... Superconducting coil, 14... Insulating material, 15... Recording medium.
Claims (1)
録磁気ヘッドに於て、記録媒体に面するる主磁極端部に
超電導材からなる渦巻状のコイルを巻回したことを特徴
とする垂直記録磁気ヘッド。1. A perpendicular recording magnetic head consisting of a main pole, an auxiliary core, and a signal coil, characterized in that a spiral coil made of superconducting material is wound around the main pole end facing the recording medium. Recording magnetic head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63228627A JPH0278003A (en) | 1988-09-14 | 1988-09-14 | Perpendicular recording magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63228627A JPH0278003A (en) | 1988-09-14 | 1988-09-14 | Perpendicular recording magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0278003A true JPH0278003A (en) | 1990-03-19 |
Family
ID=16879304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63228627A Pending JPH0278003A (en) | 1988-09-14 | 1988-09-14 | Perpendicular recording magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0278003A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8730622B2 (en) | 2012-01-20 | 2014-05-20 | Kabushiki Kaisha Toshiba | Disk drive with spoiler having shield member |
-
1988
- 1988-09-14 JP JP63228627A patent/JPH0278003A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8730622B2 (en) | 2012-01-20 | 2014-05-20 | Kabushiki Kaisha Toshiba | Disk drive with spoiler having shield member |
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