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JPS62120616A - Magnetoresistive head - Google Patents

Magnetoresistive head

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Publication number
JPS62120616A
JPS62120616AJP25971285AJP25971285AJPS62120616AJP S62120616 AJPS62120616 AJP S62120616AJP 25971285 AJP25971285 AJP 25971285AJP 25971285 AJP25971285 AJP 25971285AJP S62120616 AJPS62120616 AJP S62120616A
Authority
JP
Japan
Prior art keywords
thin film
stripe
head
parts
stripes
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
Application number
JP25971285A
Other languages
Japanese (ja)
Inventor
Toshihiko Ota
大田 俊彦
Hiroaki Yoda
博明 與田
Masahito Imai
雅人 今井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba CorpfiledCriticalToshiba Corp
Priority to JP25971285ApriorityCriticalpatent/JPS62120616A/en
Publication of JPS62120616ApublicationCriticalpatent/JPS62120616A/en
Pendinglegal-statusCriticalCurrent

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Abstract

PURPOSE:To form an MR head prevented from the generation of Barkhausen noise by arranging an insulating soft magnetic film between magneto-resistance effect elements arranged with an interval so as to be superposed to the end parts of the elements. CONSTITUTION:Stripes 11, 12 consisting of MR films are formed on the same line and the end parts of thin films 13-15 consisting of NiZn ferrite are superposed to the end parts of the stripes 11, 12. The thin film 13, the stripe 11, the thin film 14, the stripe 12, and the thin film 15 are magnetically connected with each other. Thereby, a magnetic wall is generated only in the thin film parts 13, 15 and there exists no magnetic wall on the stripes 11, 12 to be the element parts. Consequently, Barkhausen noise does not generate at all on the stripe parts 11, 12. Since the thin films 13-15 consist of an insulating material, the thin film 13-15 are electrically insulated from leads 16, 17 and 18, 19 and the leads 16, 18 e.g. can be set up to equal potential.

Description

Translated fromJapanese
【発明の詳細な説明】[Detailed description of the invention]

〔発明の技術分野〕本発明は磁気抵抗効果形ヘッドに関する。〔発明の技術的背景〕の相対速度が小さい場合でも大きな出力の得られる磁束
応答形ヘッドとして、磁気抵抗効果形ヘッドが注目され
ている。このヘッドはFeNi等の強磁性膜の′電気抵
抗が外部磁界によシ変化すること(磁気抵抗効果)を利
用して信号磁界の変化を電気抵抗の変化として検出する
ものである。の形状としては通常第2図に示すようなものがあげられ
る。すなわち、厚さ300X乃至1000XのFeNi
膜のストライブ(1)をその長手方向が磁化容易軸とな
るようにパターンニングし、記録媒体からの磁界Hが上
dごストライブ(1)の幅方向に印加されるよう配置す
る。ところで、ストライブ(1)は通常の方法では単磁
正膜とならず、膜の磁気的二ネルギーが最小となる様な
磁区構造を有する。例えば第3図に示すように環流構造
をとる。このような磁壁(2)があれば、外部磁界Hに
対して不連続的な磁壁移動が生じ、必らずノイズ(バル
ク・・ウゼンノイズ)となる。なお、ストライブ(1)
の+[Wを長さlよシ十分小さくすれば、形状異方性に
より単磁区構造をとりやすくなるが、端子の磁壁は決し
てなくならない。(第4図のように磁壁(3)が発生す
る。)〔背景技術の問題点〕第2図に示したヘッドの場合、トラック幅Wよシもスト
ライプ(1)の長さlを十分長くとることばよシ、スト
ライプ(1)の端部の抵抗が検出されない構造とするこ
とも可能である。そして、これによりバルクハウゼンノ
イズも生じさせないようにできる。しかしながら、マル
チトラックヘッドのようにMRヘッドが隣接して並置さ
れる構造を有する場合には長さlを十分に大きくするこ
とはできない。そこで、マルチトラックヘッドにおいて
MR部をすべて連結させて1つのストライプ(4)とし
各トラック毎にリード線(5)を接続する方法(第5図
参照)も考えられる。し25ふしながら、端子に共通ア
ースを接続することができないため、このような方法は
電気的に複雑となってしまう。〔発明の目的〕本発明は上述した点に鑑みてなされたもので、バルクハ
ウゼンノイズの発生がないMRヘッドを提供することを
目的とする。〔発明の概要〕本発明はマルチトラック形のMR,ヘクト
[Technical Field of the Invention] The present invention relates to a magnetoresistive head. [Technical Background of the Invention] A magnetoresistive head is attracting attention as a magnetic flux responsive head that can provide a large output even when the relative velocity of the magnetic head is small. This head detects changes in a signal magnetic field as changes in electrical resistance by utilizing the fact that the electrical resistance of a ferromagnetic film such as FeNi changes due to an external magnetic field (magnetoresistive effect). The shape shown in FIG. 2 is usually cited. That is, FeNi with a thickness of 300X to 1000X
The film stripe (1) is patterned so that its longitudinal direction is the axis of easy magnetization, and arranged so that the magnetic field H from the recording medium is applied in the width direction of the upper stripe (1). By the way, the stripe (1) does not become a monomagnetic positive film by a normal method, but has a magnetic domain structure such that the magnetic binary energy of the film is minimized. For example, as shown in FIG. 3, a circulation structure is adopted. If such a domain wall (2) exists, discontinuous domain wall movement occurs in response to the external magnetic field H, which inevitably results in noise (bulk noise). Furthermore, Strive (1)
If +[W of +[W is made sufficiently smaller than the length l, it becomes easier to obtain a single domain structure due to shape anisotropy, but the domain wall of the terminal never disappears. (Domain wall (3) is generated as shown in Fig. 4.) [Problems in the background art] In the case of the head shown in Fig. 2, the track width W and the length l of the stripe (1) are made sufficiently long. In other words, it is also possible to have a structure in which the resistance at the end of the stripe (1) is not detected. This also makes it possible to prevent Barkhausen noise from occurring. However, when the MR head has a structure in which MR heads are juxtaposed adjacent to each other, such as a multi-track head, the length l cannot be made sufficiently large. Therefore, a method (see FIG. 5) may be considered in which all the MR sections in the multi-track head are connected to form one stripe (4) and a lead wire (5) is connected to each track. However, such a method is electrically complex since the terminals cannot be connected to a common ground. [Object of the Invention] The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide an MR head that does not generate Barkhausen noise. [Summary of the invention] The present invention provides a multi-track type MR, a hector.

【おいて、間隔をもって配置された磁気抵抗効果素子(MR素子)の間に素子端部と重なり合うようにしようにしたものである。これによりMR素子内に磁区が存在せず、電気的にも従来通り各素子のリード端子の一方を共通アースとすることができる。〔発明の実施例〕In this case, the end portions of the magnetoresistive elements (MR elements) are overlapped with each other between the magnetoresistive elements (MR elements) arranged at intervals. As a result, no magnetic domain exists within the MR element, and electrically, one of the lead terminals of each element can be used as a common ground as before.[Embodiments of the invention]

以下、本発明の一実施例を第1図にもとづいて説明する
。第1図は2トラツクのM几ヘッドの一実施例でアル0σ
υ、α2はMR膜のストライプであり、同一線上に形成
されている。113) 、α(1)、α9はN1znフ
エライトよシなる薄膜でおシ、それらの端部はストライ
ブa9.圓の端部に重なり合っている0まだ、αe乃至
(11はこのMRヘッドのリードである。第1図の如きヘッドによれば、磁気的に薄膜a3)、ス
トライプα1)、薄膜I、バストイプ11z1薄膜a9
は連結される。従って、磁壁は薄膜Q3 、1!19部
分にのみ発生し、素子部であるストライプ[11) 、
α2には磁壁が存在しない。よって、上記ストライプa
】)、α2部分にはバルクハウゼンノイズは全く発生し
ないっまた、薄膜α9.任る。α9は絶縁体であるため
、リードσω、 (17)とu81. (1!1とは電
気的に絶縁されている0従って、例えばリードaυとα
秒とを等電位にさせることが可能である。なお、第1図のヘッドのストライプσB、α■の形ビー
ムスバッター法が適しており、パターンニングの方法と
しては薄膜0→、1→、(1つが形成される部分以外の
部分をフォトレジストで覆い、基板ae全全面膜形成し
た後にフォトレジストを取り除くリフト法が適している
。〔発明の効果〕以上述べたように本発明によれば、パルクツ・クー4i
フ/イズの発生がないマルチヘッド形の磁気抵抗効果形
ヘッドを供給できる。
An embodiment of the present invention will be described below with reference to FIG. Figure 1 shows an example of a 2-track M-type head with an angle of 0σ.
υ and α2 are stripes of the MR film, which are formed on the same line. 113), α(1), α9 are thin films made of N1zn ferrite, and their ends are striped a9. 0, αe to (11) overlapping the ends of the circle are the leads of this MR head. According to the head as shown in Fig. 1, magnetically thin film a3), stripe α1), thin film I, and bust type 11z1 thin film a9
are concatenated. Therefore, the domain wall occurs only in the thin film Q3, 1!19 part, and the stripe [11), which is the element part,
There is no domain wall in α2. Therefore, the above stripe a
]), Barkhausen noise does not occur at all in the α2 part, and the thin film α9. Leave it to me. Since α9 is an insulator, lead σω, (17) and u81. (1! 1 is electrically insulated 0 Therefore, for example, leads aυ and α
It is possible to make the second and the second equipotential. Note that the beam batter method in the form of stripes σB and α■ of the head shown in Figure 1 is suitable, and the patterning method is to use photoresist to cover the areas other than the areas where the thin films 0→, 1→, (1) are formed. A lift method in which the photoresist is removed after covering and forming a film on the entire surface of the substrate is suitable. [Effects of the Invention] As described above, according to the present invention, the
It is possible to provide a multi-head type magnetoresistive head that does not cause noise.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明になる磁気抵抗効果素子兵ヘッドの一実
施例を示す斜視図、第2図は従来の磁気抵抗形ヘッドの
一例を示す斜視図、第3図乃至第5図は第2図の磁気抵
抗形ヘッドの問題点を説明するだめの図である、11 、12・・・磁気抵抗効果素子。13乃至15・・・絶縁性軟磁性膜、16乃至19・・・リード。代理人 弁理士  則 近 憲 佑同  宇治 弘第1図第2図第3図14 図
FIG. 1 is a perspective view showing an embodiment of a magnetoresistive head according to the present invention, FIG. 2 is a perspective view showing an example of a conventional magnetoresistive head, and FIGS. 11, 12... Magnetoresistive elements. 13 to 15... Insulating soft magnetic film, 16 to 19... Lead. Agent Patent Attorney Nori Ken Chika Yudo Hiroshi UjiFigure 1Figure 2Figure 3Figure 14Figure

Claims (1)

Translated fromJapanese
【特許請求の範囲】[Claims]素子の長手方向に間隔をもって配置された複数の磁気抵
抗効果素子と、これらの隣接素子間に配置され、隣接素
子の対向する端部の上部にその両端部がそれぞれ重なる
如くして形成された絶縁性軟磁性膜と、前記複数の磁気
抵抗効果素子のそれぞれの両端部に接続されたリードと
を具備したことを特徴とする磁気抵抗効果形ヘッド。
A plurality of magnetoresistive elements arranged at intervals in the longitudinal direction of the element, and an insulator arranged between these adjacent elements so that both ends of the elements overlap the opposing ends of the adjacent elements. 1. A magnetoresistive head comprising: a magnetic soft magnetic film; and leads connected to both ends of each of the plurality of magnetoresistive elements.
JP25971285A1985-11-211985-11-21 Magnetoresistive headPendingJPS62120616A (en)

Priority Applications (1)

Application NumberPriority DateFiling DateTitle
JP25971285AJPS62120616A (en)1985-11-211985-11-21 Magnetoresistive head

Applications Claiming Priority (1)

Application NumberPriority DateFiling DateTitle
JP25971285AJPS62120616A (en)1985-11-211985-11-21 Magnetoresistive head

Publications (1)

Publication NumberPublication Date
JPS62120616Atrue JPS62120616A (en)1987-06-01

Family

ID=17337890

Family Applications (1)

Application NumberTitlePriority DateFiling Date
JP25971285APendingJPS62120616A (en)1985-11-211985-11-21 Magnetoresistive head

Country Status (1)

CountryLink
JP (1)JPS62120616A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication numberPriority datePublication dateAssigneeTitle
JPH054307U (en)*1991-06-171993-01-22株式会社村田製作所 Magnetic sensor
US5905611A (en)*1992-11-301999-05-18Kabushiki Kaisha ToshibaThin film magnetic head responsive to spin-dependent scattering

Cited By (4)

* Cited by examiner, † Cited by third party
Publication numberPriority datePublication dateAssigneeTitle
JPH054307U (en)*1991-06-171993-01-22株式会社村田製作所 Magnetic sensor
US5905611A (en)*1992-11-301999-05-18Kabushiki Kaisha ToshibaThin film magnetic head responsive to spin-dependent scattering
US6046891A (en)*1992-11-302000-04-04Kabushiki Kaisha ToshibaThin film head
US6172858B1 (en)1992-11-302001-01-09Kabushiki Kaisha ToshibaThin film head

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