JPH01303614A - Magnetic head - Google Patents

Magnetic head

Info

Publication number
JPH01303614A
JPH01303614A JP13259688A JP13259688A JPH01303614A JP H01303614 A JPH01303614 A JP H01303614A JP 13259688 A JP13259688 A JP 13259688A JP 13259688 A JP13259688 A JP 13259688A JP H01303614 A JPH01303614 A JP H01303614A
Authority
JP
Japan
Prior art keywords
magnetic
material layer
magnetic material
ferrite core
gap
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
JP13259688A
Other languages
Japanese (ja)
Inventor
Masahiro Sugimori
杉森 昌弘
Toshio Umehara
梅原 敏男
Hiromitsu Ito
浩光 伊藤
Hirofumi Mochizuki
広文 望月
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.)
FDK Corp
Original Assignee
FDK 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 FDK Corp filed Critical FDK Corp
Priority to JP13259688A priority Critical patent/JPH01303614A/en
Publication of JPH01303614A publication Critical patent/JPH01303614A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent the generation of a pseudo gap and to improve the joint strength of ferrite cores by providing a thermally stable magnetic material layer between a magnetic metallic film and the one ferrite core. CONSTITUTION:The magnetic metallic film 7 is interposed between the magnetic metallic film 4' and the I-shaped ferrite core 1. The magnetic metallic film 7 is formed of a thermally stable magnetic material; for example, Fe is used. The magnetic material layer 7 is, therefore, stable even to the heat generated at the time of joining the two ferrite cores by bonding glass 6 and the boundary between the magnetic material layer 7 and the ferrite cores 1, 2 is maintained in the stable state. The possibility of generating the pseudo gap by the nonmagnetic material part formed between both is eliminated in this way and the joint strength is increased.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は、磁気ヘッドに係り、より具体的にはギャッ
プに飽和磁束密度の大きい磁性金属膜を介在させたメタ
ルインギャップ式の磁気ヘッドの改良に関するものであ
る。
Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a magnetic head, and more specifically to a metal-in-gap type magnetic head in which a magnetic metal film with a high saturation magnetic flux density is interposed in the gap. It is about improvement.

(従来の技術) 近年、磁気ディスク装置における記録の高密度化の要請
から、ギャップ部分に高飽和磁束密度の金属性薄膜を用
いたMIG (メタルインギャップ)ヘッドが研究・開
発されている。そして、この種の磁気ヘッドの一例を示
すと、第3図のようになっている。
(Prior Art) In recent years, due to the demand for higher recording density in magnetic disk devices, research and development have been conducted on MIG (metal-in-gap) heads that use a metallic thin film with a high saturation magnetic flux density in the gap portion. An example of this type of magnetic head is shown in FIG. 3.

すなわち、同図に示すように、細長な角柱状のI型フェ
ライトコア1と、略コ字状のU型フェライトコア2とを
組み合わせてギャップ3を形成するのであるが、この時
、I型フェライトコア1のギャップ対向面にスパッタリ
ング等によって飽和密度の高い磁性金属膜4を形成して
おくとともに、さらにこの磁性金属膜4とU型フェライ
トコア2の対向面との間に非磁性材である高融点ガラス
5を介在させる。そして、この高融点ガラス5がデータ
の読み書きなどを行う実質的なギャップ部となる。さら
に、I型フェライトコア1とU型フェライトコア2のギ
ヤツブ3近傍部分を低融点ガラスからなるボンディング
カラス6でもって接着−体化させる。
That is, as shown in the figure, a gap 3 is formed by combining an elongated prismatic I-type ferrite core 1 and a substantially U-shaped U-shaped ferrite core 2. A magnetic metal film 4 with high saturation density is formed by sputtering or the like on the surface of the core 1 facing the gap, and a high density non-magnetic material is further formed between the magnetic metal film 4 and the surface facing the U-shaped ferrite core 2. A melting point glass 5 is interposed. This high melting point glass 5 becomes a substantial gap portion for reading and writing data. Furthermore, the portions of the I-type ferrite core 1 and the U-type ferrite core 2 near the gear 3 are bonded together using a bonding glass 6 made of low-melting glass.

(発明が解決しようとする課題) しかしながら、上記した従来の磁気ヘッドでは、ボンデ
ィングガラス6にて両フェライトコア1゜2を接着する
際に、低融点ガラスを溶融しなければならず、その際に
生じる熱によりl型フェライトコア1と磁性金属膜4間
の界面が不安定状態となり、その部分に非磁性材層が形
成されてしまう。
(Problem to be Solved by the Invention) However, in the conventional magnetic head described above, when bonding both ferrite cores 1.2 with the bonding glass 6, the low melting point glass must be melted. The generated heat makes the interface between the l-type ferrite core 1 and the magnetic metal film 4 unstable, and a non-magnetic material layer is formed at that portion.

すると、ギャップ3内には磁性金属膜4を挟んでその両
側に非磁性材部が位置されることになり、これら両非磁
性材部がギャップ(性能の大小は問わず)としての機能
を有してしまう。
Then, non-magnetic material parts are placed in the gap 3 on both sides of the magnetic metal film 4, and both of these non-magnetic material parts have a function as a gap (regardless of its performance). Resulting in.

その結果、第4図に示すように磁気ヘッドと記憶媒体の
相対的移動に対する出力電圧の変化が綺麗な波形となら
ず、歪みを生じてしまうという問題を有する(疑似ギャ
ップの発生)。そして、この歪みは上記したl型フェラ
イトコア1と磁性金属膜4との間に生じる非磁性材層の
存在が原因である。
As a result, as shown in FIG. 4, there is a problem in that changes in the output voltage due to the relative movement of the magnetic head and the storage medium do not have a clean waveform, resulting in distortion (occurrence of a pseudo gap). This distortion is caused by the presence of the non-magnetic material layer between the above-mentioned l-type ferrite core 1 and the magnetic metal film 4.

また、上述したようにl型フェライトコア1と磁性金属
膜4間の界面の不安定化により、両者間での結合状態が
低下し、l型フェライトコア1゜U型フェライトコア2
間の接着力の低下をきたし、両フェライトコア1.2の
剥離を生じるおそれがあるという問題もある。
In addition, as described above, due to the instability of the interface between the l-type ferrite core 1 and the magnetic metal film 4, the bonding state between the two deteriorates, and the l-type ferrite core 1° and the U-type ferrite core 2
There is also a problem in that the adhesive force between the two ferrite cores 1.2 may decrease, and the two ferrite cores 1.2 may peel off.

この問題を解決するため、l型フェライトコア1と磁性
金属膜4との間に、Fe−Ni層を介在させる技術が提
案されている(日本応用磁気学会誌Vo1.lI、 N
o、2.1987第105〜108頁)。
In order to solve this problem, a technique has been proposed in which an Fe-Ni layer is interposed between the l-type ferrite core 1 and the magnetic metal film 4 (Japanese Journal of Applied Magnetics Vol. 1.lI, N
o, 2.1987, pp. 105-108).

この構成による磁気ヘッドでは、確かにFe−Ni層と
I型フェライトコア1間並びに金属膜4とFe−Ni層
間における界面での不安定化という問題は解決できるも
のの、以下のごとき新たな問題を生じる。
Although the magnetic head with this configuration can certainly solve the problem of instability at the interface between the Fe-Ni layer and the I-type ferrite core 1 and between the metal film 4 and the Fe-Ni layer, it also introduces the following new problems. arise.

すなわち、Fe−Niは、500℃近辺に磁気的な変態
点を持つのに対し、両コア1.4を接合する高融点ガラ
スを溶融する際の温度は600℃以上である。そのため
、その作業温度によってFe−Ni自体の透磁率が略ゼ
ロとなり、非磁性材となってしまう。従って、上記した
疑似ギャップの発生を充分に抑制することができない。
That is, while Fe-Ni has a magnetic transformation point around 500°C, the temperature at which the high melting point glass joining both cores 1.4 is melted is 600°C or higher. Therefore, the magnetic permeability of Fe-Ni itself becomes approximately zero depending on the working temperature, and it becomes a non-magnetic material. Therefore, the occurrence of the above-mentioned pseudo gap cannot be sufficiently suppressed.

この発明は、上記した問題点に鑑みてなされたもので、
その目的とするところは、疑似ギャップの発生を防止す
るとともに、2つのフェライトコア間の接合の強固な磁
気ヘッドを提供するにある。
This invention was made in view of the above-mentioned problems.
The purpose is to prevent the occurrence of pseudo gaps and to provide a magnetic head with a strong bond between two ferrite cores.

(課題を解決するための手段) 上記した目的を達成するため、本発明にかかる磁気ヘッ
ドでは、2つのフェライトコアを組み合わせたギャップ
をボンディングガラスで接合するとともに、該ギャップ
内に磁性金属膜を備えた磁気ヘッドにおいて、該磁性金
属膜と該フェライトコアとの間に熱的に安定な磁性材層
を配設した。
(Means for Solving the Problems) In order to achieve the above-mentioned object, in the magnetic head according to the present invention, a gap between two ferrite cores is bonded using bonding glass, and a magnetic metal film is provided in the gap. In the magnetic head, a thermally stable magnetic material layer was provided between the magnetic metal film and the ferrite core.

そして、好ましくは、上記熱的に安定な磁性材層が、F
e、Ni、Fe−3t並びにFe−C。
Preferably, the thermally stable magnetic material layer is F
e, Ni, Fe-3t and Fe-C.

のうち、いずれか1つの材質から形成することである。It is to be formed from any one of these materials.

(作 用) 本発明では、熱的に安定な磁性材層を磁性金属膜とフェ
ライトコアとの間に配設したため、2つのフェライトコ
アをボンディングガラスにて接合する時に発生する熱に
よっても上記磁性材層は安定であり、磁性材層とフェラ
イトコア間の界面も安定状態を維持する。その結果、両
者間に非磁性材部が形成されて疑似ギャップを生じるお
それもなく、また、接合強度も強固なものとなる。
(Function) In the present invention, since the thermally stable magnetic material layer is disposed between the magnetic metal film and the ferrite core, the heat generated when bonding the two ferrite cores with bonding glass can also cause the magnetic The material layer is stable, and the interface between the magnetic material layer and the ferrite core also maintains a stable state. As a result, there is no possibility that a non-magnetic material portion will be formed between the two to create a pseudo gap, and the bonding strength will also be strong.

一方、磁性金属膜と磁性材層との間は、両者はともに磁
性材であるため、たとえ熱が加えられたとしても両者間
の界面は磁気的に安定状態を維持する。
On the other hand, since both the magnetic metal film and the magnetic material layer are made of magnetic materials, the interface between them maintains a magnetically stable state even if heat is applied.

(実 施 例) 以下、本発明の好適な実施例について添付図面を参照に
して説明する。
(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

第1図は本発明の一実施例を示す要部拡大図である。同
図に示すように、基本的には従来と同様に、l型フェラ
イトコア1とU型フェライトコア2との対向面間に形成
されるギャップ3部分に磁性金属膜4′と高融点ガラス
5を介装させている。
FIG. 1 is an enlarged view of essential parts showing an embodiment of the present invention. As shown in the figure, basically as in the conventional case, a magnetic metal film 4' and a high melting point glass 5 is interposed.

そして、本実施例では、磁性金属膜4′としてはセンダ
ストを用いている。
In this embodiment, sendust is used as the magnetic metal film 4'.

ここで本発明では、上記磁性金属膜4′とI型フェライ
トコア1との間に磁性薄膜層7を介設している。そして
、この磁性薄膜層7は、熱的に安定な磁性材料から形成
され、例えばFeが用いられる。また、Feの替わりに
Ni、Fe−Si或いはFe−Co等種々の材質のもの
を用いることができる。
In the present invention, a magnetic thin film layer 7 is interposed between the magnetic metal film 4' and the I-type ferrite core 1. The magnetic thin film layer 7 is made of a thermally stable magnetic material, such as Fe. Further, instead of Fe, various materials such as Ni, Fe-Si, or Fe-Co can be used.

そして、これら各種の材料はいずれも磁気的な変態点が
900℃以上と高く、たとえ、高融点ガラスを溶融する
作業温度下でも磁気的に変化しない。
All of these various materials have high magnetic transformation points of 900° C. or higher, and do not change magnetically even under the working temperature of melting high melting point glass.

また、この磁性薄膜層7を形成するには、例えば、I型
フェライトコア1の表面にスパッタリング等により磁性
薄膜層7を形成し、さらにその磁性薄膜層7の表面にセ
ンダストをスパッタリングにより形成する。以後、通常
の工程にしたがって、磁気ヘッドを製造する。
In order to form the magnetic thin film layer 7, for example, the magnetic thin film layer 7 is formed on the surface of the I-type ferrite core 1 by sputtering or the like, and sendust is further formed on the surface of the magnetic thin film layer 7 by sputtering. Thereafter, a magnetic head is manufactured according to normal processes.

(発明の効果) 以上のように、本発明に係る磁気ヘッドでは、磁性金属
膜と一方のフェライトコアとの間に熱的に安定な磁性材
層を設けたため、2つのフェライトコアを接合する際に
用いるボンディングガラスの溶融時に生じる熱によって
も上記磁性材層は磁気的に安定状態を維持する。さらに
、その磁性材層とフェライトコア間の界面も安定状態を
維持し、非磁性部分を形成しない。その結果、第2図に
示すように、その磁気ヘッドの出力波形は歪みのない綺
麗なものとなる(疑似ギャップが発生しない)また、上
記のように磁性材層とフェライトコア間の界面の状態が
安定であるため、両者間の接合強度も低下することなく
、2つのフェライトコアは強固に接合させる。
(Effects of the Invention) As described above, in the magnetic head according to the present invention, since the thermally stable magnetic material layer is provided between the magnetic metal film and one of the ferrite cores, when the two ferrite cores are joined together, The magnetic material layer maintains a magnetically stable state even with the heat generated during melting of the bonding glass used in the process. Furthermore, the interface between the magnetic material layer and the ferrite core also maintains a stable state and does not form a non-magnetic portion. As a result, as shown in Figure 2, the output waveform of the magnetic head becomes clear and distortion-free (no pseudo-gap occurs), and as described above, the state of the interface between the magnetic material layer and the ferrite core is is stable, the two ferrite cores are firmly joined together without reducing the joining strength between them.

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

第1図は本発明に係る磁気ヘッドの好適な一実施例を示
す要部拡大図、第2図はその特性を示すグラフ、第3図
は従来の磁気ヘッドを示す図、第4図はその特性を示す
グラフである。 1・・・I型フェライトコア 2・・・U型フェライトコア 3・・・ギャップ     4′・・・磁性金属膜5・
・・高融点ガラス   6・・・ボンディングガラス7
・・・磁性材層 特許出願人      富士電気化学株式会社代 理 
人      弁理士 −色 健 輔同       
 弁理士 松 本 雅 利第2図 一特開 第4図 一一一
FIG. 1 is an enlarged view of main parts showing a preferred embodiment of the magnetic head according to the present invention, FIG. 2 is a graph showing its characteristics, FIG. 3 is a diagram showing a conventional magnetic head, and FIG. 4 is a diagram showing its characteristics. It is a graph showing characteristics. 1... I-type ferrite core 2... U-type ferrite core 3... Gap 4'... Magnetic metal film 5...
...High melting point glass 6...Bonding glass 7
...Magnetic material layer patent applicant Fuji Electrochemical Co., Ltd. Representative
Person Patent Attorney - Ken Sukedo Iro
Patent Attorney Masatoshi Matsumoto Figure 2-1 JP-A Figure 4-111

Claims (1)

【特許請求の範囲】[Claims] (1)2つのフェライトコアを組み合わせたギャップを
ボンディングガラスで接合するとともに、該ギャップ内
に磁性金属膜を備えた磁気ヘッドにおいて、該磁性金属
膜と該フェライトコアとの間に熱的に安定な磁性材層を
配設してなることを特徴とする磁気ヘッド。(2)上記
熱的に安定な磁性材層が、Fe、Ni、Fe−Si並び
にFe−Coのうち、いずれか1つの材質からなること
を特徴とする請求項1記載の磁気ヘッド。
(1) In a magnetic head in which a gap in which two ferrite cores are combined is bonded with bonding glass and a magnetic metal film is provided in the gap, there is a thermally stable gap between the magnetic metal film and the ferrite core. A magnetic head comprising a magnetic material layer. (2) The magnetic head according to claim 1, wherein the thermally stable magnetic material layer is made of any one of Fe, Ni, Fe-Si, and Fe-Co.
JP13259688A 1988-06-01 1988-06-01 Magnetic head Pending JPH01303614A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13259688A JPH01303614A (en) 1988-06-01 1988-06-01 Magnetic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13259688A JPH01303614A (en) 1988-06-01 1988-06-01 Magnetic head

Publications (1)

Publication Number Publication Date
JPH01303614A true JPH01303614A (en) 1989-12-07

Family

ID=15085039

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13259688A Pending JPH01303614A (en) 1988-06-01 1988-06-01 Magnetic head

Country Status (1)

Country Link
JP (1) JPH01303614A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0254405A (en) * 1988-08-18 1990-02-23 Matsushita Electric Ind Co Ltd Magnetic head
JPH035906A (en) * 1989-06-02 1991-01-11 Matsushita Electric Ind Co Ltd Magnetic head
EP0700033A2 (en) * 1994-08-26 1996-03-06 Aiwa Co., Ltd. Side-mounted thin film magnetic head and method of fabrication thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61287015A (en) * 1985-06-14 1986-12-17 Hitachi Ltd Magentic head
JPS6339106A (en) * 1986-08-02 1988-02-19 Sony Corp Magnetic head
JPS6381609A (en) * 1986-09-26 1988-04-12 Tdk Corp Magnetic head
JPS63279404A (en) * 1987-05-12 1988-11-16 Sumitomo Special Metals Co Ltd Composite type magnetic head
JPS63285715A (en) * 1987-05-18 1988-11-22 Sanyo Electric Co Ltd Magnetic head

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61287015A (en) * 1985-06-14 1986-12-17 Hitachi Ltd Magentic head
JPS6339106A (en) * 1986-08-02 1988-02-19 Sony Corp Magnetic head
JPS6381609A (en) * 1986-09-26 1988-04-12 Tdk Corp Magnetic head
JPS63279404A (en) * 1987-05-12 1988-11-16 Sumitomo Special Metals Co Ltd Composite type magnetic head
JPS63285715A (en) * 1987-05-18 1988-11-22 Sanyo Electric Co Ltd Magnetic head

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0254405A (en) * 1988-08-18 1990-02-23 Matsushita Electric Ind Co Ltd Magnetic head
JPH035906A (en) * 1989-06-02 1991-01-11 Matsushita Electric Ind Co Ltd Magnetic head
EP0700033A2 (en) * 1994-08-26 1996-03-06 Aiwa Co., Ltd. Side-mounted thin film magnetic head and method of fabrication thereof
EP0700033A3 (en) * 1994-08-26 1996-05-22 Aiwa Co Side-mounted thin film magnetic head and method of fabrication thereof
US5777824A (en) * 1994-08-26 1998-07-07 Aiwa Research And Development, Inc. Side-disposed thin film magnetic head and method of fabrication thereof

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