JPH0448415A - Magnetic head - Google Patents

Magnetic head

Info

Publication number
JPH0448415A
JPH0448415A JP15445190A JP15445190A JPH0448415A JP H0448415 A JPH0448415 A JP H0448415A JP 15445190 A JP15445190 A JP 15445190A JP 15445190 A JP15445190 A JP 15445190A JP H0448415 A JPH0448415 A JP H0448415A
Authority
JP
Japan
Prior art keywords
thin film
film layer
thickness
magnetic
trailing side
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
JP15445190A
Other languages
Japanese (ja)
Inventor
Yasushi Kanai
靖 金井
Hiroe Takano
高野 弘恵
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.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric Co Ltd
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 Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Priority to JP15445190A priority Critical patent/JPH0448415A/en
Publication of JPH0448415A publication Critical patent/JPH0448415A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To improve a recording characteristic by forming a thin film layer constituted of a magnetic metal on the surfaces of both magnetic cores at a trailing side and a leading side, and making the thickness of the thin film layer at the trailing side thicker than that of the thin film layer at the leading side. CONSTITUTION:A thin film layer 3a is formed on the surface of a magnetic core 1a at the trailing side, and also a thin film 3b is formed on the surface of a magnetic core 1b at the leading side. Cosequently, this magnetic head can keep the thickness of these entire thin film layers 3a and 3b to be thick even when the thickness of respective thin film layers 3a and 3b is not so thick. Therefore, the increases of an eddy current loss and a film stress generated remarkably when the thickness of the single thin film layer is only made large are surpressed so that the recording characteristic can be improved. Also, the thickness of the thin film layer 3a at the trailing side is larger than that of the thin film layer 3b at the leading side. Thus, the recording characteristic can be improved further.

Description

【発明の詳細な説明】 「産業上の利用分野」 本発明は、いわゆるメタルインギャップ型の磁気ヘッド
、すなわち、磁気ギャップ内に磁性金属の薄膜層を設け
た形式の磁気ヘッドに関するものである。
DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a so-called metal-in-gap magnetic head, that is, a magnetic head in which a thin film layer of magnetic metal is provided within a magnetic gap.

「従来の技術およびその課題」 固定ディスク用の磁気ヘッドとして、!6図に示すメタ
ルインギャップ型といわれる形式のものが知られている
。これは、フェライトからなる一対の磁気コアli、l
bのうち、トレーリング側の磁気コア11の表面に、ク
ロム等の下地層2を介してたとえばF s−A I−3
i系合金(センダスト)、パーマロイ、アモルファス金
属等の磁性金属からなる薄膜層3を設けるとともに、そ
の磁性金属の薄膜層3とリーディング側の磁気コアlb
の間に、Sin、等からなるギャップ層4により磁気ギ
ャップを形成した構成のものである。上記の下地層2は
、薄膜層3の磁気コア11への拡散を防止するとともに
、2次ギャップ対策として設けられるが、これは省略さ
れることもある。
"Conventional technology and its problems" As a magnetic head for fixed disks! A so-called metal-in-gap type shown in FIG. 6 is known. This consists of a pair of magnetic cores li, l made of ferrite.
For example, F s-A I-3 is applied to the surface of the magnetic core 11 on the trailing side of b through an underlayer 2 such as chromium.
A thin film layer 3 made of a magnetic metal such as i-based alloy (Sendust), permalloy, amorphous metal, etc. is provided, and the thin film layer 3 of the magnetic metal and the magnetic core lb on the leading side are provided.
In between, a magnetic gap is formed by a gap layer 4 made of, for example, Sin. The underlayer 2 is provided to prevent the thin film layer 3 from diffusing into the magnetic core 11 and to prevent the secondary gap, but it may be omitted in some cases.

ところで、上記のようなメタルインギャップ型の磁気ヘ
ッドでは、薄膜層3の厚みを大きくすると原理的には記
録特性が向上するはずであるが、実際には、薄膜層3を
単に厚くすることでは記録特性がそれほど向上するもの
ではないことが確認されている。その理由は定かではな
いが、薄膜層3の厚みが大きくなるにつれて渦電流損が
増大するため、まI;、ガラスポンディングの際の熱変
形に起因して膜応力が増大するためではないか、と考え
られている。
By the way, in the metal-in-gap type magnetic head as described above, recording characteristics should be improved in principle by increasing the thickness of the thin film layer 3, but in reality, simply increasing the thickness of the thin film layer 3 does not improve the recording characteristics. It has been confirmed that the recording characteristics are not significantly improved. The reason for this is not clear, but it may be because eddy current loss increases as the thickness of the thin film layer 3 increases, or because film stress increases due to thermal deformation during glass bonding. ,It is believed that.

本発明は上記の事情に鑑みてなされたもので、記録特性
をより向上させ得るメタルインギャップ型の磁気ヘッド
を提供することを目的とするものである。
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a metal-in-gap type magnetic head that can further improve recording characteristics.

「課題を解決するための手段」 本発明は、対の磁気コア間に形成したギャップ内に磁性
金属からなる薄膜層を設けてなるメタルインギャップ型
の磁気ヘッドにおいて、前記薄膜層を双方の磁気コアの
表面にそれぞれ形成してそれら薄膜層間にギャップを形
成するとともに、トレーリング側の薄膜層の厚みをリー
ディング側の薄膜層の厚みに比して大きくしてなること
を特徴とするものである。
"Means for Solving the Problems" The present invention provides a metal-in-gap type magnetic head in which a thin film layer made of a magnetic metal is provided in a gap formed between a pair of magnetic cores. The thin film layer is formed on the surface of the core to form a gap between the thin film layers, and the thickness of the thin film layer on the trailing side is larger than that of the thin film layer on the leading side. .

「実施例」 以下、本発明に係る磁気ヘッドの一実施例を第1図を参
照して説明する。
"Embodiment" Hereinafter, an embodiment of the magnetic head according to the present invention will be described with reference to FIG.

本実施例の磁気ヘッドはメタルインギャップ型のもので
あって、磁気ギャップ内に2層の薄膜層3s、3bがギ
ャップ層4を挟んで設けられた構成となっている。すな
わち、トレーリング側の磁気コア11およびリーディン
グ側の磁気コア1bの双方の表面に、従来の磁気ヘッド
における薄膜層3と同様のたとえばF e−A Is 
i系合金(センダスト)、パーマロイ、アモルファス金
属等の磁性金属からなる薄膜層3!、3bが、それぞれ
下地層2゜2としてのクロム層を介して形成され、それ
ら薄膜層3i、3b間にギャップ層4によるギャップが
形成された構成とされている。そして、本実施例の磁気
ヘッドにおいては、トレーリング側の薄膜層3aの厚み
が、リーディング側の薄膜層3bの厚みに比して大きく
なるようされている。
The magnetic head of this embodiment is of a metal-in-gap type, and has a structure in which two thin film layers 3s and 3b are provided within the magnetic gap with a gap layer 4 in between. That is, on the surfaces of both the magnetic core 11 on the trailing side and the magnetic core 1b on the leading side, a film similar to the thin film layer 3 in the conventional magnetic head, for example, Fe-A Is is applied.
Thin film layer 3 made of magnetic metal such as i-based alloy (sendust), permalloy, amorphous metal, etc. , 3b are formed through a chromium layer as a base layer 2.2, and a gap is formed between the thin film layers 3i and 3b by a gap layer 4. In the magnetic head of this embodiment, the thickness of the thin film layer 3a on the trailing side is larger than the thickness of the thin film layer 3b on the leading side.

なお、リーディング側の磁気コア1!と薄膜層3aとの
間、トレーリング側の磁気コアlbと薄膜層3bとの間
に設けた下地層2.2は省略することも可能である。
In addition, magnetic core 1 on the leading side! It is also possible to omit the underlayer 2.2 provided between the magnetic core lb on the trailing side and the thin film layer 3b, and between the magnetic core lb on the trailing side and the thin film layer 3b.

上記のように、トレーリング側の磁気コア11の表面に
薄膜層31を形成するのみならず、リーディング側の磁
気コア1bの表面にも薄膜層3bを形成することにより
、この磁気ヘッドでは、各薄膜層3a、3bの厚みをそ
れほど大きくせずともそれら薄膜層3z、3b全体での
厚みを大きく確保することができ、それによって、単一
の薄膜層の厚みを単に大きくする場合においては顕著に
生じる渦電流損の増大や膜応力の増大が抑制され、その
結果、第6図に示した従来のものに比して記録特性を向
上させることができる。
As described above, in this magnetic head, by forming not only the thin film layer 31 on the surface of the magnetic core 11 on the trailing side but also the thin film layer 3b on the surface of the magnetic core 1b on the leading side, each Even if the thickness of the thin film layers 3a and 3b is not increased so much, the thickness of the entire thin film layers 3z and 3b can be ensured to be large, and thereby, when the thickness of a single thin film layer is simply increased, Increases in eddy current loss and film stress that occur are suppressed, and as a result, recording characteristics can be improved compared to the conventional one shown in FIG.

それに加えて、この磁気ヘッドでは、トレーリング側の
薄膜層3直の厚みをリーディング側の薄膜層3bの厚み
に比して大きくしたことによって、以下の実験例に示す
ように、それら薄膜層31,3bの厚みの合計値が一定
であっても上記とは逆の場合、つまり、リーディング側
の薄膜層31の厚みをトレーリング側の薄膜層3bの厚
みに比して大きくする場合に比して、より一層の記録特
性の向上を実現できるものである。
In addition, in this magnetic head, by making the thickness of the thin film layer 3 on the trailing side larger than the thickness of the thin film layer 3b on the leading side, as shown in the following experimental example, these thin film layers 3b , 3b is constant, but in the opposite case, that is, when the thickness of the thin film layer 31 on the leading side is made larger than the thickness of the thin film layer 3b on the trailing side. As a result, further improvement in recording characteristics can be realized.

(実験例) トレーリング側の薄膜層3Jの厚みTRを3.0μmと
し、リーディング側の薄膜層3bの厚みLEを1.5μ
mとした本発明品の記録特性(起磁力に対する記録磁界
の大きさ)を、スペーシングを4段階(0,15μm、
0.2μ騙、0,25μ膳、0.3μm)にとり計算機
/ユミレーVヨンを行った。薄膜層3m、3bはFt−
AI−5i系合金により形成し、それらの飽和磁束密度
Bsを9,800、透磁率μをl 、OOOとした。ま
た、ギャップ長GLを0゜4μ履、ギャップデプスGD
を6.0μlとしt二。
(Experiment example) The thickness TR of the thin film layer 3J on the trailing side is 3.0 μm, and the thickness LE of the thin film layer 3b on the leading side is 1.5 μm.
The recording characteristics (the magnitude of the recording magnetic field relative to the magnetomotive force) of the product of the present invention were set to m, and the spacing was set to 4 stages (0, 15 μm,
0.2 μm, 0.25 μm, and 0.3 μm) were tested using a computer. Thin film layers 3m and 3b are Ft-
It was formed from an AI-5i alloy, and its saturation magnetic flux density Bs was 9,800, magnetic permeability μ was 1, and OOO. In addition, the gap length GL is 0°4μ, and the gap depth GD
Add 6.0 μl of t2.

その結果を第2図に示し、第3図に磁界急峻度θHx/
axの最大値とそのときの磁界強度Hzを示す。
The results are shown in Figure 2, and Figure 3 shows the magnetic field steepness θHx/
The maximum value of ax and the magnetic field strength Hz at that time are shown.

また、本発明品とは逆に、トレーリング側の薄膜層31
の厚みTRを15μm、リーディング側の薄膜層3bの
厚みLEを3.0μmとし、その他は本発明品と同様と
した比較対象品の記録磁界の飽和特性を第4図に示し、
第5図に磁界急峻度の特性を示す。
Moreover, contrary to the product of the present invention, the thin film layer 31 on the trailing side
FIG. 4 shows the saturation characteristics of the recording magnetic field of a comparative product with a thickness TR of 15 μm, a thickness LE of the leading side thin film layer 3b of 3.0 μm, and other conditions similar to those of the present invention.
Figure 5 shows the characteristics of magnetic field steepness.

@2図〜第5図から明らかなように、トレーリング側の
薄膜層3!の厚みをリーディング側の薄膜層3bの厚み
より大きくした本発明品の磁気ヘッドでは、比較対象品
に比して記録特性がより層内上していることが確認され
た。
@As is clear from Figures 2 to 5, the thin film layer 3 on the trailing side! It was confirmed that in the magnetic head of the present invention in which the thickness of the thin film layer 3b was larger than that of the leading side thin film layer 3b, the recording characteristics were improved within the layer compared to the comparative product.

「発明の効果」 以上で詳細に説明したように、本発明の磁気ヘッドは、
トレーリング側およびリーディング側の磁気コアの双方
の表面に磁性金属からなる薄膜層を形成するとともに、
トレーリング側の薄膜層の厚みをリーディング側の薄膜
層の厚みに比して大きくしてなるものであるから、磁気
コアの片側にのみ薄膜層を形成する場合に比して、また
、リーディング側の薄膜層の厚みをトレーリング側の薄
膜層の厚みメこ比して大きくする場合に比して、そnぞ
れ記録特性を向上させることができる、という優れた効
果を奏する。
"Effects of the Invention" As explained in detail above, the magnetic head of the present invention has the following features:
In addition to forming a thin film layer of magnetic metal on the surfaces of both the trailing side and leading side magnetic cores,
Since the thickness of the thin film layer on the trailing side is made larger than the thickness of the thin film layer on the leading side, compared to the case where a thin film layer is formed only on one side of the magnetic core, the thickness of the thin film layer on the leading side Compared to the case where the thickness of the thin film layer on the trailing side is made larger than the thickness of the thin film layer on the trailing side, the recording characteristics can be improved in each case.

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

第1図は本発明の一実施例に係る磁気ヘッドの磁気ギャ
ップ部の拡大断面図、第2図はこの磁気ヘッドの記録磁
界の飽和特性を示す図、@3図はこの磁気ヘッドの記録
磁界急峻度を示す図、第4図は比較対象品の記録磁界の
飽和特性を示す図、第5図はその比較対象品の記録磁界
急峻度を示す図、第6図は従来の磁気ヘッドの磁気ギャ
ップ部の拡大断面図である。 11・・・・・・トレーリング側の磁気コア、1b・・
・・・・リーディング側の磁気コア、2・・・・・・下
地層、 31・・・・・・トレーリング側の薄膜層、3b・・・
・・・リーディング側の薄膜層、4・・・・・・ギャッ
プ層。 出願人  アルプス電気株式会社 代表者 片 岡 政 隆 第3図 第5図 第2図 (起 磁 力) 第4図 (起 磁 力) [AT] [AT]
Fig. 1 is an enlarged sectional view of the magnetic gap portion of a magnetic head according to an embodiment of the present invention, Fig. 2 is a diagram showing the saturation characteristics of the recording magnetic field of this magnetic head, and Fig. 3 is a diagram showing the recording magnetic field of this magnetic head. Figure 4 is a diagram showing the saturation characteristics of the recording magnetic field of the comparative product, Figure 5 is a diagram showing the recording magnetic field steepness of the comparative product, and Figure 6 is the magnetic field of the conventional magnetic head. FIG. 3 is an enlarged sectional view of a gap portion. 11... Trailing side magnetic core, 1b...
...Magnetic core on the leading side, 2...Underlayer, 31...Thin film layer on the trailing side, 3b...
... Thin film layer on the leading side, 4... Gap layer. Applicant Alps Electric Co., Ltd. Representative Masataka Kataoka Figure 3 Figure 5 Figure 2 (Magnetomotive force) Figure 4 (Magnetomotive force) [AT] [AT]

Claims (1)

【特許請求の範囲】[Claims] 対の磁気コア間に形成したギャップ内に磁性金属からな
る薄膜層を設けてなるメタルインギャップ型の磁気ヘッ
ドにおいて、前記薄膜層を双方の磁気コアの表面にそれ
ぞれ形成してそれら薄膜層間にギャップを形成するとと
もに、トレーリング側の薄膜層の厚みをリーディング側
の薄膜層の厚みに比して大きくしてなることを特徴とす
る磁気ヘッド。
In a metal-in-gap magnetic head in which a thin film layer made of magnetic metal is provided in a gap formed between a pair of magnetic cores, the thin film layer is formed on the surface of both magnetic cores, and a gap is formed between the thin film layers. 1. A magnetic head characterized in that the thickness of the thin film layer on the trailing side is larger than the thickness of the thin film layer on the leading side.
JP15445190A 1990-06-13 1990-06-13 Magnetic head Pending JPH0448415A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15445190A JPH0448415A (en) 1990-06-13 1990-06-13 Magnetic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15445190A JPH0448415A (en) 1990-06-13 1990-06-13 Magnetic head

Publications (1)

Publication Number Publication Date
JPH0448415A true JPH0448415A (en) 1992-02-18

Family

ID=15584510

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15445190A Pending JPH0448415A (en) 1990-06-13 1990-06-13 Magnetic head

Country Status (1)

Country Link
JP (1) JPH0448415A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55157121A (en) * 1979-05-19 1980-12-06 Nippon Telegr & Teleph Corp <Ntt> Magnetic head core
JPS60160008A (en) * 1984-01-17 1985-08-21 エヌ・ベー・フイリツプス・フルーイランペンフアブリケン Magnetic head

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55157121A (en) * 1979-05-19 1980-12-06 Nippon Telegr & Teleph Corp <Ntt> Magnetic head core
JPS60160008A (en) * 1984-01-17 1985-08-21 エヌ・ベー・フイリツプス・フルーイランペンフアブリケン Magnetic head

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