JPS6047221A - Magneto-resistance effect type magnetic head - Google Patents
Magneto-resistance effect type magnetic headInfo
- Publication number
- JPS6047221A JPS6047221A JP15548283A JP15548283A JPS6047221A JP S6047221 A JPS6047221 A JP S6047221A JP 15548283 A JP15548283 A JP 15548283A JP 15548283 A JP15548283 A JP 15548283A JP S6047221 A JPS6047221 A JP S6047221A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- thin film
- width
- effect
- wmr
- 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
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
- G11B5/3916—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide
- G11B5/3919—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide the guide being interposed in the flux path
- G11B5/3922—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide the guide being interposed in the flux path the read-out elements being disposed in magnetic shunt relative to at least two parts of the flux guide structure
- G11B5/3925—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide the guide being interposed in the flux path the read-out elements being disposed in magnetic shunt relative to at least two parts of the flux guide structure the two parts being 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
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
Abstract
Description
【発明の詳細な説明】 咥業上の利用分野 本発明は磁気抵抗効果型山気ヘッドに係わる。[Detailed description of the invention] Field of commercial use The present invention relates to a magnetoresistive head.
背景技術とその問題点
磁気抵抗効果（以下Ｍ Ｉ’を効果という）型磁気へラ
ドにおいて、その磁気記録媒体との対接面に臨む磁気ギ
ャップを有する磁気回路が設けられ、この磁気回路の、
磁気記録媒体との対接面より後退した位置に設けられた
不連続部に、この不連続部を磁気的に連結するようにＭ
Ｒ効果を有する金属薄膜を配置した構成をとるようにし
たいわゆるリア型のＭＲ効果型磁気ヘッドが提案、され
ている。BACKGROUND ART AND PROBLEMS In a magnetoresistive effect (hereinafter referred to as MI' effect) type magnetic herad, a magnetic circuit having a magnetic gap facing the surface facing the magnetic recording medium is provided.
M is arranged to magnetically connect the discontinuous part to the discontinuous part provided at a position set back from the surface facing the magnetic recording medium.
A so-called rear type MR effect type magnetic head has been proposed and has a configuration in which a metal thin film having an R effect is disposed.
第１図は、このリア型のＭＲ効果型磁気ヘッドの一例の
路線的拡大断面図を示す。この場合、例えば磁性フェラ
イトのＮｉ −Ｚｎ系フェライト、Ｍｎ−Ｚｎ系フェラ
イト等より成る出性基板（１）上に、この基板＋１１が
導電性を有する場合には、これの上に５ｉ０２等の絶縁
層＋２１を介することによって、後述するＭＲ効果を有
する金属薄膜に対するバイアス磁界を与えるに供するバ
イアス磁界発生用の電流通路となる帯状の導電膜より成
るバイアス導体（３）が被着され、このバイアス導体（
３）上に、絶縁層（４）を介して例えば、Ｎｉ−Ｆｅ系
合金、或いはＮｉ −Ｃｏ系合金等のＭＩｔ効果を有す
る磁性薄膜（５）が幅ＷＭＲをもって被着される。そし
て、この磁性薄膜（５）上に薄い絶縁層（６）を介して
各一端が跨り、バイアス導体（３）及び磁性薄膜（５）
を横切る方向に延長して夫々、例えばＭｏパーマロイよ
り成り、夫々磁気回路の一部の磁気コアとなる対の磁性
層（７）及び（８）が被着される。基板（１上には、非
磁性の絶縁性保護層（９）を介して、保副基板（１０）
が接合される。一方の磁性層（７）と前方端との間には
、所要の厚さを有する非磁性のギャップスベニサ層０］
１が介在すれて前方の磁気ギャップｇが形成される。そ
してこの磁気ギャップｇが臨むように、基板（１＋、ギ
ャップスペーサ層０１）、磁性層（７）、保護層（９）
及び保護基板ｃ１０）の前方面が研摩されて磁気記録媒
体との対接面（１２）が形成される。また、磁気ギャッ
プｇを構成する磁性層（７）の後方端と、他方の磁性層
（８）の前方端とは、夫々Ｍ Ｒ効果を有する磁性薄膜
（５）上に絶縁層（６）を介して跨るように形成される
も、両端間には幅Ｗをもって離間する不連続部α３）が
形成される。両研性層（７）及び（８）の後方端及び前
方端は、ＭＲ効果を有する母性薄膜（５）の両側に夫々
絶縁層（６）の介在によって電気的には絶縁されるも、
磁気的には結合するようになされ、両磁性層（７）及び
（８）の不連続部０間が磁性薄膜（５）によって磁気的
に連結されて、基板（１）−磁気ギャップｇ−磁性層（
７）−磁性薄膜（５１−ｉ性層（８）一基板（１）の閉
磁路を形成する磁気回路が形成される。FIG. 1 shows an enlarged cross-sectional view of an example of this rear type MR effect type magnetic head. In this case, if this substrate +11 is electrically conductive, an insulating material such as 5i02 is placed on the conductive substrate (1) made of magnetic ferrite such as Ni-Zn ferrite or Mn-Zn ferrite. A bias conductor (3) made of a strip-shaped conductive film that serves as a current path for generating a bias magnetic field for applying a bias magnetic field to a metal thin film having an MR effect, which will be described later, is deposited through the layer +21, and this bias conductor (
3) A magnetic thin film (5) having a MIt effect, such as a Ni--Fe alloy or a Ni--Co alloy, is deposited on the insulating layer (4) with a width WMR. The bias conductor (3) and the magnetic thin film (5) are then straddled at one end over the magnetic thin film (5) via a thin insulating layer (6).
A pair of magnetic layers (7) and (8) made of, for example, Mo permalloy and each serving as a magnetic core of a part of the magnetic circuit are deposited extending in the transverse direction. A protective substrate (10) is placed on the substrate (1 through a non-magnetic insulating protective layer (9)).
are joined. Between one magnetic layer (7) and the front end, there is a non-magnetic gap thin layer 0 having the required thickness.
1 intervening to form a front magnetic gap g. Then, so that this magnetic gap g faces, the substrate (1+, gap spacer layer 01), magnetic layer (7), protective layer (9)
The front surface of the protective substrate c10) is polished to form a surface (12) that faces the magnetic recording medium. Furthermore, the rear end of the magnetic layer (7) constituting the magnetic gap g and the front end of the other magnetic layer (8) are formed by forming an insulating layer (6) on a magnetic thin film (5) having an MR effect. Although the discontinuous portion α3) is formed so as to straddle the discontinuous portion, a discontinuous portion α3) is formed between both ends thereof and is spaced apart by a width W. Although the rear ends and front ends of the ampholytic layers (7) and (8) are electrically insulated by the interposition of insulating layers (6) on both sides of the mother thin film (5) having an MR effect,
The discontinuous portions 0 of both magnetic layers (7) and (8) are magnetically connected by the magnetic thin film (5), and the substrate (1) - magnetic gap g - magnetic layer(
7) - Magnetic thin film (51-i) A magnetic circuit forming a closed magnetic path of one substrate (1) is formed.
このような構成によるＭＲ効果型磁気ヘッドにおいて、
信頼性を確保するためには、すなわち、磁気媒体との対
接による摩耗によっても、磁気ギャップｇが消滅すると
とがないように、この磁気ギャップｇのギ・ヤツブデプ
ス（深さ）ｄは、できるだけ犬に選定することが望まし
いが、このギャップデプスｄを犬にすることは、感度及
びＳ／Ｈの低下を来す。第２図は、このギャップデプス
ｄと出力との関係を示したもので、これによれば、感度
とギャップデプスとは反比例の関係にある。例えば、初
期のギャップデプスが１５μｍである場合についてみる
と、ＭＲ薄膜近傍の構造によって例えば２ｄＢの出力損
をしているとすると、これをギャップデプスに換算する
と、３．２μｍ程度損をしていることになり、これを寿
命に換算すると、その摩耗が１μｍ／１０００時間であ
るとするとき、 ３２００時間の損をすることになる。In the MR effect type magnetic head with such a configuration,
In order to ensure reliability, that is, to prevent the magnetic gap g from disappearing due to wear due to contact with the magnetic medium, the gear depth d of the magnetic gap g should be set as low as possible. Although it is desirable to select the gap depth d to be a dog, setting the gap depth d to a dog results in a decrease in sensitivity and S/H. FIG. 2 shows the relationship between the gap depth d and the output, and it shows that the sensitivity and the gap depth are inversely proportional. For example, in the case where the initial gap depth is 15 μm, if the structure near the MR thin film causes an output loss of, for example, 2 dB, then converting this to gap depth results in a loss of approximately 3.2 μm. Therefore, when converting this into lifespan, assuming that the wear is 1 μm/1000 hours, there will be a loss of 3200 hours.
また、例えば１．５ｄＢの損をしているとすると、これ
は２．４μｍ程度のギャップデプスの損で寿命にして２
４００時間損することになる。For example, if the loss is 1.5 dB, this is a gap depth loss of about 2.4 μm, which is 2 times the lifespan.
You will lose 400 hours.
発明の目的
本発明は、ＭＲ効果型磁気ヘッドにおいて、上述した関
係に着目して、実質的にＭＩ（効果薄膜近傍に係わるＳ
／Ｎをその最大値から１．５ｄＢの損失内にとどめる構
成をとり、このようにすることによって実質的に、ギャ
ップデプスの損を小とし、磁気ヘッドの信頼性、寿命の
向上をはかるものである。OBJECTS OF THE INVENTION The present invention focuses on the above-mentioned relationship in an MR effect type magnetic head, and aims to substantially improve MI (S related to the vicinity of the effect thin film).
/N within a loss of 1.5 dB from its maximum value. By doing so, the loss of gap depth is substantially reduced and the reliability and life of the magnetic head are improved. be.
発明の概要
本発明においては、磁気ギャップを有しこの磁気ギャッ
プが磁気記録媒体との対接面に臨んで設けられた磁気回
路を有し、この磁気回路には、幅Ｗを有する不連続部が
設けられ、この不連続部には、これら間を磁気的に連結
するようにこの不連続部間に差し渡って不連続部の両端
と磁気的に結合するように幅ＷＭＲを有するＭＲ効果を
有する磁性薄膜を配置する構成を採るものである。そし
て、特に本発明においては、上述した磁気回路の不連続
部の幅Ｗと、ＭＲ効果を有する感性薄膜の幅ＷＭＲとを
、
４
−ＷＭＲりＷ ＜−ＷＭＲ・・・・（１）５
の関係に選定することによって、このＭＲ効果の碍性薄
膜近傍に係わる要素によって決るＳ／Ｎの最大値より１
．５ｄＢ以内にその損失をとどめる。SUMMARY OF THE INVENTION The present invention includes a magnetic circuit having a magnetic gap, the magnetic gap facing a surface facing a magnetic recording medium, and a discontinuous portion having a width W in the magnetic circuit. is provided in the discontinuous portion, and an MR effect having a width WMR is provided in the discontinuous portion so as to span between the discontinuous portions so as to magnetically connect the discontinuous portion and to magnetically couple with both ends of the discontinuous portion. This configuration adopts a configuration in which a magnetic thin film having a magnetic thin film is disposed. In particular, in the present invention, the width W of the discontinuous portion of the magnetic circuit described above and the width WMR of the sensitive thin film having the MR effect are defined as follows: 4 - WMR W < - WMR (1) 5 1 from the maximum S/N value determined by the factors related to the vicinity of the strong thin film of this MR effect.
．． Keep the loss within 5dB.
実施例
本発明においては、例えば第１図で説明したと同様の構
造とする。Embodiment In the present invention, a structure similar to that described in FIG. 1 is used, for example.
尚、ＭＲ効果を有する磁性薄膜（５）は、ＭＲ効果が正
常な範囲で薄い２００Ｘ程度とされる。The magnetic thin film (5) having an MR effect has a thickness of about 200X, which is within the normal range of the MR effect.
ここで、磁気ヘッドの感度を決定する要因は種々あり、
磁気ギャップｇのギャップ長や、ギャップデプスも、こ
の感度に影智を与えるが、これらは、夫々周波数特性や
、前述した寿命によって決定され、磁気回路を構成する
第１図における磁気コアとなる対の磁性層（７）及び（
８）とＭＲ効果を有する感性薄膜（５）との間に介在さ
れる絶縁層（６）の厚さが、歩留り等を考慮した範囲で
薄くされる。There are various factors that determine the sensitivity of a magnetic head.
The gap length and gap depth of the magnetic gap g also have an influence on this sensitivity, but these are determined by the frequency characteristics and the aforementioned lifetime, respectively. magnetic layer (7) and (
8) and the sensitive thin film (5) having an MR effect, the thickness of the insulating layer (6) is reduced within a range that takes into account yield and the like.
この構造において本発明においては、Ｍ Ｒ効果を有す
る磁性薄膜（５）の幅ＷＭＲと、Ｓ気回路の不連続部の
幅Ｗとの関係を前記（１１式の関係に特定する。In this structure, in the present invention, the relationship between the width WMR of the magnetic thin film (5) having the MR effect and the width W of the discontinuous portion of the S air circuit is specified as the relationship expressed by equation (11) above.
すなわち、今、上述の構造において、Ｍ Ｒ効果を有す
る磁性薄膜（５）の幅ＷＭＲを夫々３μｍ、５μｍ。That is, in the above structure, the width WMR of the magnetic thin film (5) having the MR effect is 3 μm and 5 μm, respectively.
７μｍとしたときの夫々の８気回路の不連続部の幅Ｗと
Ｓ／Ｎとを測定すると夫々第３図、第４図及び第５図に
示すようになり、いずれのｔμ合においても、Ｗ二２
ＷＭＲの時にＳ／Ｎは最大となる。そして、この部分で
の損失を１．５ ｄ Ｂ以内にとどめるとすると、前記
（１１式の、
丁Ｗ独＜ｗ＜ＷＭＲ
となり、ここに本発明においてこの構成に特定する所以
があるのである。When the width W and the S/N of the discontinuous part of each 8-air circuit are measured when the width is 7 μm, they are shown in FIGS. 3, 4, and 5, and for any tμ, W22
The S/N is maximum during WMR. If the loss in this part is to be kept within 1.5 dB, then in the equation (11), the following equation holds true: WMR<w<WMR, which is the reason why this configuration is specified in the present invention.
発明の効果
上述したように本発明においては、いわゆるリア型のＭ
Ｒ効果型磁気ヘッドにおいて、前記（１）式の構成をと
ることによって最大のＳ／Ｎから１．５ｄＢ以内の損失
にとどめるものであり、このようにして冒頭に述べた理
由から、結果的に信頼性、寿命の向上をはかることがで
きるのである。Effects of the Invention As mentioned above, in the present invention, the so-called rear type M
In the R-effect magnetic head, by adopting the configuration of equation (1) above, the loss is kept within 1.5 dB from the maximum S/N, and for the reason stated at the beginning, as a result, This makes it possible to improve reliability and service life.
第１図は本発明を適用する磁気抵抗効果型８気ヘッドの
一例の路線的拡大断面図、第２図はその磁気ギャップの
ギャップデプスと出力との関係を示す曲線図、第３図な
いし第５図は夫々磁気回路の不連続部の幅・とＳ／Ｎと
の関係の測定結果を示す曲線図である。
ｉｌ＋は基板、（５）は山気抵抗効果を有する磁性薄膜
、（７）及び（８）はａ気回路を構成する宙性層、０３
はその不連続部、ｇは磁気ギャップである。
第１図
デ゛ブスｄ（メ五ｍ）
第５図
ｗ−（Ａｍ）FIG. 1 is an enlarged cross-sectional view of an example of a magnetoresistive 8-air head to which the present invention is applied, FIG. 2 is a curve diagram showing the relationship between the gap depth of the magnetic gap and the output, and FIGS. FIG. 5 is a curve diagram showing the measurement results of the relationship between the width of the discontinuous portion of the magnetic circuit and the S/N. il+ is the substrate, (5) is a magnetic thin film having a mountain resistance effect, (7) and (8) are interstitial layers forming the a-air circuit, 03
is the discontinuity and g is the magnetic gap. Figure 1 Debs d (Me 5m) Figure 5 w-(Am)
Claims (1)
対接面に臨んで設けられた磁気回路を有し、該磁気回路
には幅Ｗを有する不連続部が設けられ、該不連続部と磁
気的に結合するように、幅ＷＭＲを有する磁気抵抗効果
を有する磁性薄膜が設けられて成り、上記磁気回路の不
連続部の幅Ｗと、上記磁性薄膜の幅ｗＭＲとが、 ４ −ＷＭＲ≦Ｗく了ＷＭＲ の関係を満足するように選定された磁気抵抗効果型磁気
ヘッド。[Claims] A magnetic circuit having a magnetic gap, the gap facing a surface facing a magnetic recording medium, and a discontinuous portion having a width W is provided in the magnetic circuit. A magnetic thin film having a magnetoresistive effect having a width WMR is provided so as to be magnetically coupled to the discontinuous portion, and a width W of the discontinuous portion of the magnetic circuit and a width wMR of the magnetic thin film are provided. A magnetoresistive magnetic head selected such that the following relationship is satisfied:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15548283A JPS6047221A (en) | 1983-08-25 | 1983-08-25 | Magneto-resistance effect type magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15548283A JPS6047221A (en) | 1983-08-25 | 1983-08-25 | Magneto-resistance effect type magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6047221A true JPS6047221A (en) | 1985-03-14 |
Family
ID=15607006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15548283A Pending JPS6047221A (en) | 1983-08-25 | 1983-08-25 | Magneto-resistance effect type magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6047221A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9638347B2 (en) | 2015-03-11 | 2017-05-02 | Waterworks Technology Development Organization Co., Ltd. | Device for blocking a flow passage using an inflatable bag |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5123125A (en) * | 1974-08-20 | 1976-02-24 | Matsushita Electric Ind Co Ltd | JIKI HETSUDO |
| JPS529413A (en) * | 1975-07-11 | 1977-01-25 | Matsushita Electric Ind Co Ltd | Magnetic head |
| JPS58115620A (en) * | 1981-12-28 | 1983-07-09 | Hitachi Ltd | Magnetic flux detection type magnetic head |
-
1983
- 1983-08-25 JP JP15548283A patent/JPS6047221A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5123125A (en) * | 1974-08-20 | 1976-02-24 | Matsushita Electric Ind Co Ltd | JIKI HETSUDO |
| JPS529413A (en) * | 1975-07-11 | 1977-01-25 | Matsushita Electric Ind Co Ltd | Magnetic head |
| JPS58115620A (en) * | 1981-12-28 | 1983-07-09 | Hitachi Ltd | Magnetic flux detection type magnetic head |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9638347B2 (en) | 2015-03-11 | 2017-05-02 | Waterworks Technology Development Organization Co., Ltd. | Device for blocking a flow passage using an inflatable bag |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0204902B1 (en) | Yoke type magnetic transducer head utilizing a magnetoresistance effect | |
| EP0669608A1 (en) | Planar head having separate read and write gaps | |
| US4679107A (en) | Magnetic transducer head utilizing magnetoresistance effect | |
| JPS6114572B2 (en) | ||
| US5880911A (en) | Magnetoresistive effect element | |
| US4700252A (en) | Magnetic thin film head | |
| JPS62192017A (en) | Magnetic head | |
| JPS6047221A (en) | Magneto-resistance effect type magnetic head | |
| JP2505465B2 (en) | Yoke type thin film magnetic head | |
| GB2095888A (en) | Magnetic transducer heads | |
| EP0113980B1 (en) | Magnetic transducer heads utilising magnetoresistance effect | |
| JP2507710B2 (en) | Yoke type thin film magnetic head | |
| EP0482642A2 (en) | Composite magnetoresistive thin-film magnetic head | |
| JPS61177616A (en) | Thin film magnetic head | |
| US4654739A (en) | Thin film magnetic head for reproducing perpendicular magnetization | |
| JPH0441415B2 (en) | ||
| JPS626420A (en) | Thin film magnetic head | |
| JPS62102411A (en) | Magneto-resistance effect head | |
| JPS5925282B2 (en) | magnetoresistive head | |
| JPH0546945A (en) | Polishing method for thin film magnetic head | |
| JPS626421A (en) | Thin film magnetic head | |
| JPH0516642Y2 (en) | ||
| JPS6050712A (en) | Magneto-resistance effect type thin film magnetic head | |
| JPH06223333A (en) | Magnetoresistance-effect playback head | |
| JPH1083518A (en) | Magnetoresistive effect type magnetic head |