JPS6252710A - Thin film magnetic head - Google Patents
Thin film magnetic headInfo
- Publication number
- JPS6252710A JPS6252710A JP19106785A JP19106785A JPS6252710A JP S6252710 A JPS6252710 A JP S6252710A JP 19106785 A JP19106785 A JP 19106785A JP 19106785 A JP19106785 A JP 19106785A JP S6252710 A JPS6252710 A JP S6252710A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- pole piece
- magnetic pole
- layer
- width
- 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
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/3113—Details for improving the magnetic domain structure or avoiding the formation or displacement of undesirable magnetic domains
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関し、特に電磁誘導効果を利
用して磁気記録媒体への読み書きを行なう薄膜ヘッドに
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thin film magnetic head, and more particularly to a thin film head that uses electromagnetic induction effects to read from and write to a magnetic recording medium.
薄膜磁気ヘッドにおいては、応答の早い磁化回転を利用
するために、磁気媒体面の法線方向に垂直に磁化容易軸
が向くように磁気異方性をつける。In a thin film magnetic head, in order to utilize magnetization rotation with a quick response, magnetic anisotropy is provided so that the axis of easy magnetization is oriented perpendicular to the normal direction of the magnetic medium surface.
しかし、磁極片の端部においては自由磁荷が発生しない
ように還流磁区が生じ、磁気媒体面の法線と平行な方向
に向く磁化が現われる。However, at the end of the magnetic pole piece, a reflux magnetic domain is generated so that free magnetic charges are not generated, and magnetization appears in a direction parallel to the normal to the magnetic medium surface.
第４図は従来の薄膜磁気ヘッドの磁極片およびその磁区
構造の例を磁気媒体側から見た斜視図である。Ｒ／Ｗギ
ャップ３をはさむ下部磁極片１および上部磁極片２に還
流磁区４の現われるようすが示しである。矢印は磁化の
向きを表わしている。FIG. 4 is a perspective view of an example of the magnetic pole piece and its magnetic domain structure of a conventional thin film magnetic head, viewed from the magnetic medium side. The figure shows how the reflux magnetic domain 4 appears in the lower magnetic pole piece 1 and the upper magnetic pole piece 2 that sandwich the R/W gap 3. The arrow represents the direction of magnetization.
上述した従来の薄膜磁気ヘッドは、磁極片の端部に現わ
れる還流磁区のために磁気効率が低下し、またはなはだ
しい場合には磁壁移動による波形ひずみ現象を伴う。こ
れらの現象は高トランク密度化のために磁極片の幅を小
さくするほど顕著になる０
本発明は磁化の向きの循環による自由磁荷の発生を阻止
した薄膜磁気ヘッド金提供するものである。In the conventional thin-film magnetic head described above, the magnetic efficiency decreases due to the reflux magnetic domain appearing at the end of the pole piece, or in severe cases, waveform distortion occurs due to domain wall movement. These phenomena become more pronounced as the width of the magnetic pole piece is made smaller in order to achieve higher trunk density.The present invention provides a thin film magnetic head which prevents the generation of free magnetic charges due to circulation of magnetization direction.
本発明の薄膜磁気ヘッドは、第１の磁性層と、該磁性層
よりトラック幅方向に幅の狭い非磁性層と、該非磁性層
よりトラック幅方向に幅が広くかつ周端部で第１の磁性
層と接続する第２の磁性層から成る磁極片を有すること
を特徴とするものである０
〔実施例〕
次に、本発明について図面を参照して説明する。The thin-film magnetic head of the present invention includes a first magnetic layer, a non-magnetic layer narrower in the track width direction than the magnetic layer, and a first magnetic layer wider in the track width direction than the non-magnetic layer at the peripheral edge. The present invention is characterized by having a magnetic pole piece made of a second magnetic layer connected to the magnetic layer.Examples Next, the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の磁極片を磁気媒体側から見
た斜視図である。下部磁極片１１と上部磁極片１２はと
もにほぼ同一の形をしておシ、両磁極片１１，１２は該
磁極片よ如も幅２ａだけ狭い非磁性層１４を介して第１
．第２の両磁性層１３，１５を接続している。両磁性層
１．３．１５は幅ａの端部において直接接続する。FIG. 1 is a perspective view of a magnetic pole piece according to an embodiment of the present invention, viewed from the magnetic medium side. Both the lower magnetic pole piece 11 and the upper magnetic pole piece 12 have substantially the same shape, and both magnetic pole pieces 11 and 12 are connected to the first magnetic pole piece through a non-magnetic layer 14 which is narrower than the magnetic pole piece by a width 2a.
．． Both second magnetic layers 13 and 15 are connected. Both magnetic layers 1.3.15 are directly connected at the ends of width a.
このような構成は、薄膜形成技術およびフメトリソグラ
フィ技術あるいはエツチング技術により容易に作ること
ができる。。Such a structure can be easily fabricated by thin film formation technology, fluorometry lithography technology, or etching technology. .
本発明の構成による磁極片においては、還流磁区なしに
自由磁荷の現われない磁化構造をとＺ、ことができる。In the magnetic pole piece according to the configuration of the present invention, a magnetization structure in which free magnetic charges do not appear without a circulating magnetic domain can be formed.
すなわち、この場合、磁気異方性を磁気媒体の法線に垂
直な方向に付与することにより、磁極片断面図全表わす
第２図に矢印で示したように磁化の向きを閉じた形に循
環させることができる。That is, in this case, by imparting magnetic anisotropy in a direction perpendicular to the normal line of the magnetic medium, the direction of magnetization is circulated in a closed form as shown by the arrow in Figure 2, which shows the entire cross-sectional view of the magnetic pole piece. can be done.
幅ａは磁性層の厚さと同程度であることが好ましい。ま
た非磁性層の厚さは磁性層より薄いことが必要であシ、
１０００ Ｘあるいはそれ以下であることが好ましい。It is preferable that the width a is approximately the same as the thickness of the magnetic layer. Also, the thickness of the non-magnetic layer needs to be thinner than the magnetic layer.
Preferably it is 1000X or less.
第４図は本発明のいま一つの実施例の斜視図で、垂直磁
気記録用の主磁極に用いた例を示す。この場合も第１の
磁性層２３と非磁性層２４と第２の磁性層２５とを積層
することにより、磁化の向きを循環させている。２６は
コイルである。FIG. 4 is a perspective view of another embodiment of the present invention, showing an example in which it is used as a main pole for perpendicular magnetic recording. In this case as well, the direction of magnetization is circulated by laminating the first magnetic layer 23, the nonmagnetic layer 24, and the second magnetic layer 25. 26 is a coil.
以上説明したように本発明は、磁化の向きが循環して自
由磁荷が生じないように磁極片を構成することにより、
猿流礎区が発生しないようにして効率の低下および波形
ひずみを防ぐことができる。As explained above, the present invention can achieve
It is possible to prevent a drop in efficiency and a waveform distortion by preventing the occurrence of a flowing foundation zone.
環流磁区の発生（寸単に磁性層と非磁性層全多数積層す
るだけでも抑えられるが、本発明の構成は全く自由磁荷
を生じないため、さらに効率が増すことができる効果？
有するものである。The generation of circulating magnetic domains (which can be suppressed simply by laminating all the magnetic layers and non-magnetic layers, but the structure of the present invention does not generate any free magnetic charges, so the efficiency can be further increased.)
It is something that you have.
第１図は本発明の第１の実施例を示す斜視図、第２図は
本発明の磁極片の断面図、第３図は本発明の他の実施例
を示す斜視図、第４図は従来の薄膜磁気ヘッドの磁極片
の斜視図である。
１３．２３・・・第１の磁性層、１４ｒ２４・・・非磁
性層、１５＋２５・・・第２の磁性層。
特許出願人 日本電気株式会社 −
代 理 人 弁理士菅野 中、］）
＼卦８
第１図
第２図
第３図FIG. 1 is a perspective view showing a first embodiment of the invention, FIG. 2 is a sectional view of a magnetic pole piece of the invention, FIG. 3 is a perspective view showing another embodiment of the invention, and FIG. 4 is a perspective view showing a first embodiment of the invention. FIG. 2 is a perspective view of a magnetic pole piece of a conventional thin film magnetic head. 13.23...First magnetic layer, 14r24...Nonmagnetic layer, 15+25...Second magnetic layer. Patent Applicant: NEC Corporation - Agent: Patent Attorney Naka Kanno ]) ＼卦8 Figure 1 Figure 2 Figure 3
Claims (1)
幅の狭い非磁性層と、該非磁性層よりトラック幅方向に
幅が広くかつ周端部で第１の磁性層と接続する第２の磁
性層からなる磁極片を有することを特徴とする薄膜磁気
ヘッド。(1) A first magnetic layer, a nonmagnetic layer narrower in the track width direction than the magnetic layer, and a nonmagnetic layer wider in the track width direction than the nonmagnetic layer and connected to the first magnetic layer at the peripheral edge. A thin film magnetic head characterized in that it has a magnetic pole piece made of a second magnetic layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19106785A JPS6252710A (en) | 1985-08-30 | 1985-08-30 | Thin film magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19106785A JPS6252710A (en) | 1985-08-30 | 1985-08-30 | Thin film magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6252710A true JPS6252710A (en) | 1987-03-07 |
Family
ID=16268322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19106785A Pending JPS6252710A (en) | 1985-08-30 | 1985-08-30 | Thin film magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6252710A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH038105A (en) * | 1989-06-05 | 1991-01-16 | Hitachi Ltd | Magnetic head |
| US5108837A (en) * | 1987-12-04 | 1992-04-28 | Digital Equipment Corporation | Laminated poles for recording heads |
| US5331728A (en) * | 1989-11-07 | 1994-07-26 | International Business Machines Corporation | Method of fabricating magnetic thin film structures with edge closure layers |
| WO2000025306A1 (en) * | 1998-10-23 | 2000-05-04 | Seagate Technology Inc. | A merged read/write head for a disk drive |
| US7394620B2 (en) | 2003-04-28 | 2008-07-01 | Kabushiki Kaisha Toshiba | Perpendicular magnetic recording head and magnetic disc apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5960721A (en) * | 1982-09-30 | 1984-04-06 | Fujitsu Ltd | Thin film type magnetic head |
-
1985
- 1985-08-30 JP JP19106785A patent/JPS6252710A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5960721A (en) * | 1982-09-30 | 1984-04-06 | Fujitsu Ltd | Thin film type magnetic head |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5108837A (en) * | 1987-12-04 | 1992-04-28 | Digital Equipment Corporation | Laminated poles for recording heads |
| JPH038105A (en) * | 1989-06-05 | 1991-01-16 | Hitachi Ltd | Magnetic head |
| US5331728A (en) * | 1989-11-07 | 1994-07-26 | International Business Machines Corporation | Method of fabricating magnetic thin film structures with edge closure layers |
| WO2000025306A1 (en) * | 1998-10-23 | 2000-05-04 | Seagate Technology Inc. | A merged read/write head for a disk drive |
| GB2370683A (en) * | 1998-10-23 | 2002-07-03 | Seagate Technology Llc | A merged read/write head for a disk drive |
| GB2370683B (en) * | 1998-10-23 | 2003-04-02 | Seagate Technology Llc | A merged read/write head for a disk drive |
| US7394620B2 (en) | 2003-04-28 | 2008-07-01 | Kabushiki Kaisha Toshiba | Perpendicular magnetic recording head and magnetic disc apparatus |
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