JPS61120313A - Thin film magnetic head - Google Patents
Thin film magnetic headInfo
- Publication number
- JPS61120313A JPS61120313A JP24000584A JP24000584A JPS61120313A JP S61120313 A JPS61120313 A JP S61120313A JP 24000584 A JP24000584 A JP 24000584A JP 24000584 A JP24000584 A JP 24000584A JP S61120313 A JPS61120313 A JP S61120313A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- groove
- thin film
- depth
- 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.)
- Pending
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
- G11B5/312—Details for reducing flux leakage between the electrical coil layers and the magnetic cores or poles or between the magnetic cores or poles
-
- 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
- G11B5/31—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)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、ＤＡＴ等の磁気記録再生装置に用いる薄膜磁
気ヘッド（記録用インダクテイプヘッド）に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a thin film magnetic head (recording inductance head) used in a magnetic recording/reproducing device such as a DAT.
（口１ 従来の技術
一般に、磁気記録再生装置に用いる磁気ヘッドとしては
記録ヘッドと再生ヘッドが必要であることは言うまでも
ないが、ＶＴＲ等のように記録と再生を兼ねた所謂録再
兼用ヘッドが用いられる場合が多い。ところが、固定ヘ
ッド方式ＤＡＴ（ディジタル・オーディオ・テープレコ
ーダー）ではその記録に原理的に従来のバルクヘッドと
同じインダクティプヘッドが用いられ、その再生に磁気
押抗効果型ヘッド（ＭＲヘッド）が用いられている。そ
して、この固定ヘッド方式ＤＡ’Ｉ’に用いる記録用ヘ
ッドとして近年薄膜磁気ヘッドが有望視されている。こ
れは、高いトラック密度が比較的容易に実現でき、しか
も量産性の点からも有利であると考えられているからで
ある。(1) Conventional technology Generally speaking, it goes without saying that a magnetic head used in a magnetic recording/reproducing device requires a recording head and a reproducing head. However, fixed head DATs (digital audio tape recorders) use an inductive head, which is basically the same as a conventional bulk head, for recording, and use a magnetic force effect head ( In recent years, thin film magnetic heads have been seen as a promising recording head for use in this fixed head type DA'I'.This is because high track density can be achieved relatively easily. Moreover, it is considered to be advantageous from the point of view of mass production.
（ハ）発明が解決しようとする問題点
即ち、第９図に示すのが従来の薄膜磁気ヘッドの一例で
あり、このような構造のヘッドの場合Ａ部での磁束の漏
洩が大きいだけでなく下部磁性体基板（１）と上部磁性
体層（２＋との間隔が全範囲にわたって大きくないため
に磁気ギャップ部（３）への磁束の到達廊が低いと云わ
れてきた（例えば、特公昭５９−３１７６９号公報参照
）。尚、（４）は導体コイル層、（５１は絶縁層である
。この点を改善するため第１０図に示すように下部磁性
体基板（ＩＩにガラス等の非磁性材（６１が充填される
溝（７）ｔ−形成した薄膜磁気ヘッドが提案されている
。その他、磁束の漏洩だけでなく上部磁性体層の磁気特
性の劣化を防ぐためにもポリイミド系樹脂等を用いて平
坦化を図ったり、コイルを積層型にするなどして部分的
に大きな磁束の漏れはなくなって来ている。(c) Problems to be solved by the invention: Figure 9 shows an example of a conventional thin-film magnetic head, and in a head with such a structure, not only is there a large leakage of magnetic flux at the part A; It has been said that because the distance between the lower magnetic substrate (1) and the upper magnetic layer (2+) is not large over the entire range, the passage of magnetic flux to the magnetic gap (3) is low (for example, (Refer to Publication No. 31769). Note that (4) is a conductive coil layer, and (51 is an insulating layer.) In order to improve this point, as shown in FIG. A thin film magnetic head has been proposed in which a groove (7) T is filled with a material (61).In addition, polyimide resin or the like is used to prevent not only leakage of magnetic flux but also deterioration of the magnetic properties of the upper magnetic layer. The large leakage of magnetic flux has been eliminated in some areas by flattening the coils and making the coils laminated.
この様に、磁束の漏れを極力避けるためには溝を設けた
方が良いとされてきたが、溝を設けたことによる記録性
能の向上は溝のないものに比べて左程著しいものではな
かった。In this way, it has been thought that it is better to provide grooves in order to avoid leakage of magnetic flux as much as possible, but the improvement in recording performance due to grooves is not as remarkable as on the left compared to one without grooves. Ta.
（ロ）問題点を解決するための手段
本発明は上記した問題点を解決するために、非磁性材で
充填された溝を有する下部磁性体基板の上部に導体コイ
ル層と、上部磁性体層等を形成した薄膜磁気ヘプトにか
いて、磁気ギャップ部のデプスエンド点と上下磁性体接
合点との中点を境にしてデプスエンド側の平均溝深さを
上下磁性体接合側の平均溝深さよりも深くするようにし
たものである。(b) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a conductive coil layer and an upper magnetic layer on the upper part of a lower magnetic substrate having a groove filled with a non-magnetic material. In a thin film magnetic heptite formed with It was designed to be deeper than it is.
（ホ）作 用
上記した本発明薄膜磁気ヘッドでは、導体コイル層下方
の下部磁性体基板に施した溝をデプスエンド側と上下磁
性体接合側とに分けて磁束の漏れ易いデプスエンド側の
方を上下磁性体接合−よりも深くすることによって、磁
気ギヤツブ部以外での漏れ磁束を大幅に減少し、且つ上
下磁性体接合側での下部磁性体層への起磁力を大きくす
ると同時に平均磁路長も小さくし、磁気ギャップ部での
磁束密度を高め記録磁場が大きくなるよう作用する。(E) Function In the above-described thin film magnetic head of the present invention, the groove formed in the lower magnetic substrate below the conductive coil layer is divided into the depth end side and the upper and lower magnetic body junction side, so that the groove is divided into the depth end side where magnetic flux tends to leak. By making the upper and lower magnetic material junctions deeper than the upper and lower magnetic material junctions, leakage magnetic flux outside the magnetic gear part is significantly reduced, and at the same time, the magnetomotive force toward the lower magnetic layer on the upper and lower magnetic material junction sides is increased, and at the same time, the average magnetic path is By making the length smaller, the magnetic flux density at the magnetic gap portion is increased and the recording magnetic field is increased.
（へ）実施例 以下、本発明の一実施例について因面と共に説明する。(f) Example Hereinafter, one embodiment of the present invention will be described along with its details.
尚、従来と同一構成要素については同一の図書を附すと
共にその説明を省略する。Note that the same reference materials will be attached to the same components as in the prior art, and the explanation thereof will be omitted.
先ず、本発明者は磁束の漏れを少なくする目的で下部磁
性体基板に溝を形成した薄膜磁気ヘッドの記録性能が溝
のないものに比べて左程向上しない原因を追究するため
に、薄膜磁気ヘッドの記録時に訃ける磁束の流れ及び密
度をコンピューターを使って解析した。即ち、コンビ、
−ターによるシミュレーション解析を行なった結果１例
えば第１０図のような溝（７）を有する薄膜磁気ヘッド
に〉いては第１１図のように磁束のほとんどがコア内を
流れていることが判った。一方、第１０図の溝部分を無
くした第１２図のような一般的な薄膜磁気ヘッドにおい
ては第１３図のように導体コイル層（４）、特に磁気ギ
ャップ部（３１に近い部分での磁束の漏れがかなり多い
ことが判った。これらを比較してみると磁束の磁気ギャ
ップ部（３１への到達率は明らかに溝（７）ｔ−有する
場合の方が高いが、溝の無い場合には導体コイル層（４
）からすぐ下に存在する下部磁性体基板（１１へ大きな
起磁力が与えられるだけでなく平均磁路長も短かくなる
ことで全磁束量が多くなるために、到達率が低くても結
果的に磁気ギャップ部（３）での磁束密度はあまり変わ
らないと謂うことが判った。First, in order to investigate the reason why the recording performance of a thin-film magnetic head in which grooves are formed in the lower magnetic substrate for the purpose of reducing leakage of magnetic flux is not as improved as that of a head without grooves, the inventor developed a thin-film magnetic head. A computer was used to analyze the flow and density of magnetic flux that occurs during recording with the head. That is, the combination
As a result of a simulation analysis using a microcontroller, it was found that, for example, in a thin-film magnetic head with grooves (7) as shown in Fig. 10, most of the magnetic flux flows within the core, as shown in Fig. 11. . On the other hand, in a general thin-film magnetic head as shown in FIG. 12, in which the groove portion of FIG. It was found that there was quite a lot of leakage. Comparing these results, it is clear that the rate of magnetic flux reaching the magnetic gap (31) is higher in the case with the groove (7) t-, but in the case without the groove. is the conductor coil layer (4
), which is located directly below the lower magnetic substrate (11), not only gives a large magnetomotive force to the lower magnetic substrate (11), but also shortens the average magnetic path length, increasing the total magnetic flux, so even if the arrival rate is low, the result is It was found that the magnetic flux density at the magnetic gap portion (3) does not change much.
以上のことから、溝を有する薄膜磁気ヘッドの磁気ギャ
ップ部での磁束密度を大きくするためには、磁気ギヤツ
ブ部以外での磁束の漏れを極力抑えた状態で、導体コイ
ル層からの起磁力が下部磁性体基板になるべく大きく働
くように、且つ平均磁路長ができるだけ短かくなるよう
にすることが必要である。そこで、本発明者は磁気ギャ
ップ部のデプスエンド点に近い側での磁束の漏れが特に
多いという事実に着目して、そのデプスエンド点０と上
下磁性体接合点Ｐとの中点Ｑｆ、境にして溝をデプスエ
ンド側と上下磁性体接合側とに分けて、デプスエンド側
における溝の大きさく平均溝深さ）は大きく、上下磁性
体接合側の溝の大きさく平均溝深さ）は小さくすること
によって、磁気ギヤツブ部以外での磁束の漏れを極力抑
えると同時に下部磁性体基板への起磁力を大きくし且つ
平均磁路長も短かくするようにしたものである。From the above, in order to increase the magnetic flux density at the magnetic gap part of a thin-film magnetic head with grooves, the magnetomotive force from the conductor coil layer must be suppressed as much as possible while minimizing leakage of magnetic flux outside the magnetic gear part. It is necessary to make the magnetic path as large as possible on the lower magnetic substrate and to make the average magnetic path length as short as possible. Therefore, the present inventor focused on the fact that the leakage of magnetic flux is particularly large on the side near the depth end point of the magnetic gap part, and determined the midpoint Qf between the depth end point 0 and the upper and lower magnetic material junction point P, and The groove is divided into the depth end side and the upper and lower magnetic material joining sides, and the groove size (average groove depth) on the depth end side is large, and the groove size and average groove depth) on the upper and lower magnetic material joining side is large. By making it small, leakage of magnetic flux outside the magnetic gear part is suppressed as much as possible, and at the same time, the magnetomotive force to the lower magnetic substrate is increased, and the average magnetic path length is also shortened.
例えば、第１図に示すように上下磁性体接合点Ｐからデ
プスエンド点０へ近づくにつれて溝（７１ｔ−深くして
行く構造にすると、溝のない場合に比べて磁気ギャップ
部（３１以外での磁束の漏れを極めて少なくすることが
出来ると共に、全域が深い溝の場合に比して下部磁性体
基板（１１への起磁力を大きく且つ平均磁路長を短かく
することが出来、その結果磁気ギャップ部での磁束密度
が高くなり、強い記録磁場が得られるようになり、記録
効率が著しく向上される。また、第２図〜第７図は他の
実施例を示し、図示のような各溝形状によっても略同じ
様な効果を発揮させることが出来る。尚、溝の側壁形状
のうちデプスエンド点側は左程問題はないが、上下磁性
体合点側はギャップ突き合わせ面に垂直若しくはそれに
近い構造にするとその壁面に磁荷が発生し易くなりその
結果反磁場が生じて起磁力が減少するため極力避けるべ
きである。For example, if the groove (71t) is made deeper as it approaches the depth end point 0 from the upper and lower magnetic material junction point P as shown in Fig. 1, the magnetic gap portion (other than 31 Not only can leakage of magnetic flux be extremely reduced, but also the magnetomotive force to the lower magnetic substrate (11) can be increased and the average magnetic path length can be shortened, compared to the case where the entire area is a deep groove. The magnetic flux density at the gap part becomes high, a strong recording magnetic field can be obtained, and the recording efficiency is significantly improved.Furthermore, FIGS. 2 to 7 show other embodiments, and each of the Approximately the same effect can be achieved depending on the shape of the groove.In addition, the depth end point side of the side wall shape of the groove is not as problematic as the one on the left, but the side where the upper and lower magnetic materials meet is perpendicular to or close to the gap abutment surface. This structure should be avoided as much as possible because magnetic charges are likely to be generated on the wall surface, resulting in a demagnetizing field and a decrease in magnetomotive force.
以上本実施例では、基板として磁性体を用いた構造を示
してきたが、第８図の様に非磁性体基板（１１に溝（７
）ｔ−設けてその上に下部磁性体層（８）を形成し、窪
んだ部分に非磁性材（６）ｔ−充填したものによっても
同等の効果が得られることは云うまでもない。In this embodiment, a structure using a magnetic material as the substrate has been shown, but as shown in FIG.
It goes without saying that the same effect can be obtained by forming a lower magnetic layer (8) on the lower magnetic layer (8) and filling the recessed portion with a non-magnetic material (6).
（ト： 発明の効果
上述した如く本発明薄膜磁気ヘッドに依れば、起磁力印
加用としての導体コイル層の下方に位置する下部磁性体
基板に設ける溝を溝全域で同じ深さＫするのではなく、
磁気ギャップ部のデプスエンド点と上下磁性体接合点と
の中点を境にして上下磁性体接合ａｔ平均的に浅くして
いるので、磁気ギヤツブ部以外での漏洩磁束を少なく保
ちながら、下部磁性体基板への起磁力を大きくし且つ平
均磁路長も短くすることが出来、そのため磁気ギャップ
部での磁束密度が高くなって強い記録磁場が得られるよ
うになり、記録効率が着しく向上される。(G: Effects of the Invention As described above, according to the thin film magnetic head of the present invention, the groove provided in the lower magnetic substrate located below the conductor coil layer for applying magnetomotive force can be made to have the same depth K throughout the groove. not,
Since the upper and lower magnetic material junctions are made shallower on average with the depth end point of the magnetic gap part and the midpoint of the upper and lower magnetic material junction points as a border, the lower magnetic material is It is possible to increase the magnetomotive force on the body substrate and shorten the average magnetic path length, which increases the magnetic flux density at the magnetic gap part and allows a strong recording magnetic field to be obtained, significantly improving recording efficiency. Ru.
第１図は本発明薄膜磁気ヘッドの一実施例を示す断面図
、第２図、第３図、第４図、第５図、第６図、第７図及
び第８図は夫々本発明薄膜磁気ヘッドの他の実施例を示
す断面図、第９図は従来の薄膜磁気ヘッドの一例を示す
断面図、第１０図は従来の溝付き薄膜磁気ヘッドを示す
断面図、第１１図はその磁束の流れを示す図、第１２図
は一般的な溝なし薄膜磁気ヘッドを示す平面図、第１３
（１１°°°下部磁性体基板・ （２）″′°上部磁性
−・１３１ ・・・磁気ギャップ部、 （７）・・・溝
。FIG. 1 is a cross-sectional view showing one embodiment of the thin film magnetic head of the present invention, and FIGS. 2, 3, 4, 5, 6, 7, and 8 show the thin film magnetic head of the present invention 9 is a sectional view showing an example of a conventional thin film magnetic head, FIG. 10 is a sectional view showing a conventional grooved thin film magnetic head, and FIG. 11 is a sectional view showing its magnetic flux. 12 is a plan view showing a general grooveless thin film magnetic head, and FIG. 13 is a diagram showing the flow of the process.
(11°°°Lower magnetic substrate, (2)'''° Upper magnetic substrate, 131...Magnetic gap portion, (7)...Groove.
Claims (1)
の上部に導体コイル層と、上部磁性体層を形成した薄膜
磁気ヘッドにおいて、磁気ギャップ部のデプスエンド点
と上下磁性体接合点との中点を境にしてデプスエンド側
の平均溝深さを上下磁性体接合側の平均溝深さよりも深
くする事を特徴とした薄膜磁気ヘッド。(1) In a thin film magnetic head in which a conductor coil layer and an upper magnetic layer are formed on the lower magnetic substrate having a groove filled with a non-magnetic material, the depth end point of the magnetic gap portion and the upper and lower magnetic material junction points A thin film magnetic head characterized in that the average groove depth on the depth end side is deeper than the average groove depth on the upper and lower magnetic material joining sides, with the midpoint as the border.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24000584A JPS61120313A (en) | 1984-11-14 | 1984-11-14 | Thin film magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24000584A JPS61120313A (en) | 1984-11-14 | 1984-11-14 | Thin film magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61120313A true JPS61120313A (en) | 1986-06-07 |
Family
ID=17053043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24000584A Pending JPS61120313A (en) | 1984-11-14 | 1984-11-14 | Thin film magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61120313A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS646816U (en) * | 1987-07-02 | 1989-01-13 | ||
| EP0444903A2 (en) * | 1990-02-28 | 1991-09-04 | Sumitomo Special Metals Co., Ltd. | Thin-film perpendicular magnetic recording and reproducing head |
| EP0501617A2 (en) * | 1991-02-27 | 1992-09-02 | International Business Machines Corporation | Thin film magnetic read/write head |
| EP0762388A2 (en) * | 1995-09-12 | 1997-03-12 | Thomson-Csf | Magnetic recording/reproducing head |
-
1984
- 1984-11-14 JP JP24000584A patent/JPS61120313A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS646816U (en) * | 1987-07-02 | 1989-01-13 | ||
| JPH0530573Y2 (en) * | 1987-07-02 | 1993-08-05 | ||
| EP0444903A2 (en) * | 1990-02-28 | 1991-09-04 | Sumitomo Special Metals Co., Ltd. | Thin-film perpendicular magnetic recording and reproducing head |
| EP0501617A2 (en) * | 1991-02-27 | 1992-09-02 | International Business Machines Corporation | Thin film magnetic read/write head |
| EP0501617A3 (en) * | 1991-02-27 | 1994-04-27 | Ibm | |
| EP0762388A2 (en) * | 1995-09-12 | 1997-03-12 | Thomson-Csf | Magnetic recording/reproducing head |
| FR2738657A1 (en) * | 1995-09-12 | 1997-03-14 | Thomson Csf | MAGNETIC RECORDING / READING HEAD |
| EP0762388A3 (en) * | 1995-09-12 | 1997-03-19 | Thomson-Csf | Magnetic recording/reproducing head |
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