JPS63231715A - Thin-film magnetic head - Google Patents
Thin-film magnetic headInfo
- Publication number
- JPS63231715A JPS63231715A JP6390487A JP6390487A JPS63231715A JP S63231715 A JPS63231715 A JP S63231715A JP 6390487 A JP6390487 A JP 6390487A JP 6390487 A JP6390487 A JP 6390487A JP S63231715 A JPS63231715 A JP S63231715A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic head
- magnetic layer
- layer
- 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
- 239000010409 thin film Substances 0.000 title claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 4
- 239000010408 film Substances 0.000 claims 2
- 238000000151 deposition Methods 0.000 claims 1
- 230000004907 flux Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
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
- G11B5/313—Disposition of layers
- G11B5/3143—Disposition of layers including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、薄膜磁気ヘッドに係り、特に、磁気ヘッドの
構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thin film magnetic head, and particularly to the structure of a magnetic head.
磁気ディスク装置は、記録密度を向上させるため、トラ
ック密度を上げる傾向にある。このため。In magnetic disk drives, there is a tendency to increase track density in order to improve recording density. For this reason.
情報を記憶する磁気ディスク上で、隣接するトラックと
の間隔が狭くなり、磁気ヘッドが、ある一つのトラック
の情報を再生する際、隣接するトラックの情報も混入し
、同時に再生してしまう。すなわち、クロストークが生
じる。これを解決する方法の一つとして、特開昭５６−
２２２０６号公報に開示がある。On a magnetic disk that stores information, the distance between adjacent tracks becomes narrower, and when a magnetic head reproduces information from one track, information from the adjacent track is mixed in and reproduced at the same time. In other words, crosstalk occurs. One way to solve this problem is to
This is disclosed in Japanese Patent No. 22206.
上記従来技術は、磁気ヘッド先端の両端近傍に、シール
ド用の磁性薄膜を形成する方法である。しかし、隣接ト
ラックと、シールド用磁性薄膜とで作る磁気回路は、磁
性体によるリターンパスがないため、磁気回路としての
効率が低い。また、高トラツク密度になると、磁気ヘッ
ド先端部は、より微細化する。このため、磁気ヘッド先
端に、磁気ヘッドと接触しない磁性薄膜を形成するには
、より高精度なプロセス技術が必要となる。The above-mentioned conventional technique is a method in which a magnetic thin film for shielding is formed near both ends of the tip of a magnetic head. However, the magnetic circuit formed by the adjacent tracks and the magnetic thin film for shielding has low efficiency as a magnetic circuit because there is no return path made of magnetic material. Furthermore, as the track density increases, the tip of the magnetic head becomes finer. Therefore, more precise process technology is required to form a magnetic thin film at the tip of the magnetic head that does not come into contact with the magnetic head.
本発明の目的は、高トラック密度、狭トラツク幅に適し
た磁気ヘッドを提供することにある。An object of the present invention is to provide a magnetic head suitable for high track density and narrow track width.
上記目的は、磁気ヘッドの先端の両端近傍に擬似磁気ヘ
ッドを配置することにより達成される。The above object is achieved by arranging pseudo magnetic heads near both ends of the tip of the magnetic head.
磁気ヘッド先端の両端近傍に配置された擬似磁気ヘッド
は、隣接トラックから発生する磁束を吸収する。すなわ
ち、隣接トラックと擬似磁気ヘッドは、一つの磁気回路
を形成し、該隣接トラックから発生した磁束は、擬似磁
気ヘッドをバイパスして隣接トランクにもどる。これに
より、磁気ヘッドの隣接トラックとのクロストークが低
減される。Pseudo magnetic heads placed near both ends of the tip of the magnetic head absorb magnetic flux generated from adjacent tracks. That is, the adjacent track and the pseudo magnetic head form one magnetic circuit, and the magnetic flux generated from the adjacent track bypasses the pseudo magnetic head and returns to the adjacent trunk. This reduces crosstalk between the magnetic head and adjacent tracks.
また、擬似磁気ヘッドと磁気ヘッドを形成している磁性
薄膜の一部を共通とすることもできる。Furthermore, a part of the magnetic thin film forming the pseudo magnetic head and the magnetic head can be made common.
共通とした磁性薄膜は、磁気ヘッド先端部でトラック幅
相当の微細な形状にする必要がなくなり、磁気ヘッド製
造における形状の精度を低減できる。The common magnetic thin film eliminates the need to form a fine shape equivalent to the track width at the tip of the magnetic head, and can reduce the precision of the shape in manufacturing the magnetic head.
以下、本発明の一実施例を第１図ないし第３図により説
明する。基板１の上に、下部磁性層２゜コイル３．磁気
ギャップ４．上部磁性層５より、磁気ヘッドが構成され
、下部磁性層２．磁気ギャップ４．擬似上部磁性層６よ
り、擬似磁気ヘッドが構成される。第２図は、第１図に
示す磁気ヘッドの先端部の断面図である。上部磁性層５
と擬似上部磁性層６との間隔すは、磁気ギャップ４の厚
みａより大きくしておく。An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. On the substrate 1, a lower magnetic layer 2° coil 3. Magnetic gap 4. The upper magnetic layer 5 constitutes a magnetic head, and the lower magnetic layer 2. Magnetic gap 4. The pseudo upper magnetic layer 6 constitutes a pseudo magnetic head. FIG. 2 is a sectional view of the tip of the magnetic head shown in FIG. 1. Upper magnetic layer 5
The distance between the upper magnetic layer and the pseudo upper magnetic layer 6 is set to be larger than the thickness a of the magnetic gap 4.
本実施例は、磁気ヘッドと、擬似磁気ヘッドの磁性層の
一部、すなわち、下部磁性層２を共通とした例である。This embodiment is an example in which the magnetic head and a part of the magnetic layer of the pseudo-magnetic head, that is, the lower magnetic layer 2, are common.
上部磁性層５と擬似下部磁性層６は、同時に形成しても
よいが、上部磁性層２の幅Ｃが小さく、上部磁性層５の
段差部７が大きい場合、必ずしも可能ではない。この場
合、第３図に示すように、上部磁性層５を形成（ａ）し
た後、非磁性の絶縁層８を堆積し、この上に磁性層９を
堆積して（ｂ）、中央部のみを除去する（ｃ）ことで、
擬似上部磁性層６を形成することができる。The upper magnetic layer 5 and the pseudo lower magnetic layer 6 may be formed at the same time, but this is not necessarily possible when the width C of the upper magnetic layer 2 is small and the stepped portion 7 of the upper magnetic layer 5 is large. In this case, as shown in FIG. 3, after forming the upper magnetic layer 5 (a), a non-magnetic insulating layer 8 is deposited, and a magnetic layer 9 is deposited on top of this (b). By removing (c),
A pseudo upper magnetic layer 6 can be formed.
次に、第１図に示した磁気ヘッドの動作について、第４
図を用い説明する。第４図は、第１図に示した磁気ヘッ
ドが、磁気ディスク１０の情報トラック１１を再生する
際の状態を表わしている。Next, regarding the operation of the magnetic head shown in FIG.
This will be explained using figures. FIG. 4 shows the state in which the magnetic head shown in FIG. 1 is reproducing the information track 11 of the magnetic disk 10.
この際、下部磁性層２と擬似上部磁性層６からなる擬似
磁気ヘッドが磁気回路を形成し、隣接トラック１２から
発生した磁束１３は閉じる。擬似上部磁性層６の効果を
第５図を用いて説明する。At this time, the pseudo magnetic head composed of the lower magnetic layer 2 and the pseudo upper magnetic layer 6 forms a magnetic circuit, and the magnetic flux 13 generated from the adjacent track 12 is closed. The effect of the pseudo upper magnetic layer 6 will be explained using FIG. 5.
第５図は、第４図のｖ−■矢視断面を表わし、（イ）は
、擬似上部磁性層６がない場合、（ロ）は、擬似上部磁
性層６がある場合を表わす。FIG. 5 shows a cross section taken along the line v--■ in FIG. 4, and (a) shows the case where the pseudo upper magnetic layer 6 is not present, and (b) shows the case where the pseudo upper magnetic layer 6 is present.
第５図（イ）の場合、隣接トラック１２から出た磁束１
３は、下部磁性体を通り、コイル３と鎖交した後、空気
中、又は、上部磁性層２を通ってもどってくる。このた
め、コイル３と鎖交した磁束１３は、再生信号に混入す
る。In the case of Fig. 5 (a), the magnetic flux 1 emitted from the adjacent track 12
3 passes through the lower magnetic material, interlinks with the coil 3, and then returns through the air or through the upper magnetic layer 2. Therefore, the magnetic flux 13 interlinked with the coil 3 is mixed into the reproduced signal.
ところが第５図（ロ）の場合、擬似磁性層６の存在によ
り、隣接トラック１２から出た磁束１３は、下部磁性層
２と擬似上部磁性層６からなる磁気回路を通ってもどる
。このため、コイル３に鎖交する磁束１３の再生信号へ
の混入が大きく低減される。However, in the case of FIG. 5B, due to the presence of the pseudo magnetic layer 6, the magnetic flux 13 emitted from the adjacent track 12 returns through the magnetic circuit consisting of the lower magnetic layer 2 and the upper pseudo magnetic layer 6. Therefore, the mixing of the magnetic flux 13 interlinking with the coil 3 into the reproduced signal is greatly reduced.
本実施例によれば、磁気ヘッド先端の両端に配置された
擬似磁気ヘッドにより、隣接トラック１２の情報の混入
が大きく低減できる効果がある。According to this embodiment, the pseudo magnetic heads placed at both ends of the tip of the magnetic head have the effect of greatly reducing the mixing of information from adjacent tracks 12.
また、第１図に示す磁気ヘッドのトラック幅は、第２図
に示す上部磁性層５の幅Ｃのみで決定され、下部磁性層
２の形状に依存しない。よって、第３図に示す磁気ヘッ
ドの形成方法を含め、上部磁性層５のみを高精度に形成
すればよいことになり、特に狭いトラック幅の磁気ヘッ
ドの製造工程の簡易化を図る効果もある。Further, the track width of the magnetic head shown in FIG. 1 is determined only by the width C of the upper magnetic layer 5 shown in FIG. 2, and does not depend on the shape of the lower magnetic layer 2. Therefore, including the method for forming the magnetic head shown in FIG. 3, it is only necessary to form the upper magnetic layer 5 with high precision, which has the effect of simplifying the manufacturing process of a magnetic head with a particularly narrow track width. .
また、下部磁性層２を上部磁性層５の幅よりも十分広く
なし得るので、コイル３等を下部磁性層２上の平坦な部
分に形成できる点も、磁気ヘッドの製造工程を簡易化す
る効果が大きい。Furthermore, since the lower magnetic layer 2 can be made sufficiently wider than the upper magnetic layer 5, the coil 3 and the like can be formed on a flat part of the lower magnetic layer 2, which has the effect of simplifying the manufacturing process of the magnetic head. is large.
本発明者らの実験では、擬似磁気ヘッドを設けない場合
、隣接トラック１２の情報の混入は、再生信号の出力の
約−割が検出された。これに対し、擬似磁気ヘッドを設
けると、隣接トラック１２の情報の混入は１０％〜３３
％に低減され、再生信号の出力に比べ、１％〜３％にな
った。これは、ディジタル磁気記録の再生では、十分に
低減された量である。In experiments conducted by the present inventors, when no pseudo-magnetic head was provided, information from adjacent tracks 12 was detected to be mixed in at approximately -0% of the output of the reproduced signal. On the other hand, if a pseudo magnetic head is provided, the information on the adjacent track 12 will be mixed in by 10% to 33%.
%, which is 1% to 3% compared to the output of the reproduced signal. This is a sufficiently reduced amount for reproduction of digital magnetic recording.
本発明によれば、磁気ヘッドが情報トラックを再生する
際、隣接トラックの情報の混入が、低減できる。According to the present invention, when a magnetic head reproduces an information track, it is possible to reduce the mixing of information from adjacent tracks.
第１図は、本発明の一実施例の斜視図、第２図は、第１
図の断面図、第３図は、磁気ヘッド形成プロセス説明図
、第４図は、磁気ヘッドの再生動作の説明図、第５図は
、第４図のＶ−■矢視断面図である。
１・・・基板、２・・・下部磁性層、３・・・コイル、
４・・・磁気ギャップ、５・・・上部磁性層、６・・・
擬似上部磁性層。FIG. 1 is a perspective view of one embodiment of the present invention, and FIG. 2 is a perspective view of an embodiment of the present invention.
3 is an explanatory diagram of the magnetic head forming process, FIG. 4 is an explanatory diagram of the reproducing operation of the magnetic head, and FIG. 5 is a sectional diagram taken along the line V--■ in FIG. 4. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Lower magnetic layer, 3... Coil,
4... Magnetic gap, 5... Upper magnetic layer, 6...
Pseudo top magnetic layer.
Claims (1)
、所定の順序で堆積、形成して得られる磁気ヘッドにお
いて、 前記磁気ヘッドの先端の両端近傍に、前記磁性薄膜によ
り形成された磁気ギャップをもち、かつ少なくとも一枚
の前記磁性薄膜がコイルを周回しない擬似磁気ヘッドを
配置したことを特徴とする薄膜磁気ヘッド。 ２、特許請求の範囲第１項において、 前記磁気ヘッドと、前記擬似磁気ヘッドを形成している
前記磁性薄膜の一部を共通とするか、または、磁気的に
独立の前記磁性薄膜とする構造を特徴とする薄膜磁気ヘ
ッド。[Scope of Claims] 1. A magnetic head obtained by depositing and forming a magnetic thin film, an electrically insulating film, an electrically conductive film, etc. on a substrate in a predetermined order, in the vicinity of both ends of the tip of the magnetic head, A thin film magnetic head characterized in that a pseudo magnetic head is disposed having a magnetic gap formed by the magnetic thin film and in which at least one of the magnetic thin films does not revolve around a coil. 2. In claim 1, a structure in which a part of the magnetic thin film forming the magnetic head and the pseudo magnetic head is common, or the magnetic thin film is magnetically independent. A thin film magnetic head featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6390487A JPS63231715A (en) | 1987-03-20 | 1987-03-20 | Thin-film magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6390487A JPS63231715A (en) | 1987-03-20 | 1987-03-20 | Thin-film magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63231715A true JPS63231715A (en) | 1988-09-27 |
Family
ID=13242775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6390487A Pending JPS63231715A (en) | 1987-03-20 | 1987-03-20 | Thin-film magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63231715A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0333347A2 (en) * | 1988-03-16 | 1989-09-20 | Quantum Corporation | Magnetic read and write head with side shields |
| US6906893B2 (en) | 2002-10-08 | 2005-06-14 | Hitachi Global Storage Technologies | Magnetic head coil and structure for protecting same during pole notch processing |
-
1987
- 1987-03-20 JP JP6390487A patent/JPS63231715A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0333347A2 (en) * | 1988-03-16 | 1989-09-20 | Quantum Corporation | Magnetic read and write head with side shields |
| US6906893B2 (en) | 2002-10-08 | 2005-06-14 | Hitachi Global Storage Technologies | Magnetic head coil and structure for protecting same during pole notch processing |
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