JPS62262212A - Thin film magnetic head - Google Patents
Thin film magnetic headInfo
- Publication number
- JPS62262212A JPS62262212A JP10320386A JP10320386A JPS62262212A JP S62262212 A JPS62262212 A JP S62262212A JP 10320386 A JP10320386 A JP 10320386A JP 10320386 A JP10320386 A JP 10320386A JP S62262212 A JPS62262212 A JP S62262212A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic pole
- main
- pole
- magnetic
- coil
- 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 description 5
- 230000004907 flux Effects 0.000 abstract description 14
- 230000035699 permeability Effects 0.000 abstract description 8
- 230000006698 induction Effects 0.000 abstract description 2
- 229910020018 Nb Zr Inorganic materials 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
- 239000010408 film Substances 0.000 description 17
- 238000010992 reflux Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910020676 Co—N Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910000702 sendust Inorganic materials 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
- G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
-
- 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
- G11B5/17—Construction or disposition of windings
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、垂直媒体の記録・再生に用いる薄膜磁気ヘッ
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 thin film magnetic head used for recording and reproducing perpendicular media.
（従来の技術）
垂直異方性膜と高透磁率膜の２層膜よりなる垂直記録媒
体に記録・再生するためのヘッドとして第４図に示すよ
うなヘッドがある。同図はヘッドを走行方向から見たも
のであり、２１は主磁極、２２は還流磁極、２３はコイ
ルである。２４は垂直異方性膜、２５は高透磁率膜、２
６はフィルムであり、これらが垂直記録媒体２７を形成
している。還流磁極２２は主磁極２１の磁束を垂直記録
媒体２７の高透磁率膜２５に還流するものであり、コイ
ル２３は主磁極２１に巻回されている。このヘッドの動
作は、記録する場合、コイル２３に流れる信号電流によ
って生じた磁束２８は主磁極２１から高透磁率膜２５を
通って還流磁極２２から主磁極２１へ戻る。再生時には
垂直異方性膜２４の磁化から生じた磁束が同様の経路で
流れる。(Prior Art) There is a head as shown in FIG. 4 as a head for recording and reproducing information on a perpendicular recording medium consisting of a two-layered film of a perpendicular anisotropic film and a high magnetic permeability film. In this figure, the head is viewed from the running direction, and 21 is a main magnetic pole, 22 is a return magnetic pole, and 23 is a coil. 24 is a perpendicular anisotropic film, 25 is a high magnetic permeability film, 2
6 is a film, which forms a perpendicular recording medium 27. The return magnetic pole 22 returns the magnetic flux of the main pole 21 to the high magnetic permeability film 25 of the perpendicular recording medium 27, and the coil 23 is wound around the main pole 21. In the operation of this head, when recording, a magnetic flux 28 generated by a signal current flowing through the coil 23 returns from the main magnetic pole 21 to the main magnetic pole 21 through the high permeability film 25 and from the return magnetic pole 22 . During reproduction, the magnetic flux generated from the magnetization of the perpendicular anisotropic film 24 flows along a similar path.
（発明が解決しようとする問題点）
上記従来の主磁極励磁型のヘッドは開磁路構造であるた
め外部磁界をひろいやすい欠点があった。(Problems to be Solved by the Invention) The above-mentioned conventional main pole excitation type head has an open magnetic path structure, and therefore has the disadvantage of being susceptible to external magnetic fields.
すなわち、ヘッドに媒体からの信号以外に外部から磁界
２９が加わった場合、ヘッド中では磁束３０−１．３０
−２がそれぞれ主磁極２１と還流磁極２２中を流れ、主
磁極２１中を流れる磁束３０−１はコイル２３で微分さ
れノイズ電圧として検出される。主磁極２１は高透磁率
材料で作られているので外部磁界により磁束を誘起しや
すく大きなノイズを発生しやすい欠点があった。That is, when a magnetic field 29 is applied to the head from the outside in addition to the signal from the medium, the magnetic flux in the head is 30-1.30
-2 flows through the main magnetic pole 21 and the return magnetic pole 22, respectively, and the magnetic flux 30-1 flowing through the main magnetic pole 21 is differentiated by the coil 23 and detected as a noise voltage. Since the main magnetic pole 21 is made of a material with high magnetic permeability, it has the disadvantage that magnetic flux is easily induced by an external magnetic field and a large amount of noise is easily generated.
本発明の目的は、従来の欠点を解消し、外部磁界により
生じる誘導ノイズを、主磁極だけにコイルを巻いた場合
と比較して大幅に減少する薄膜磁気ヘッドを提供するこ
とである。SUMMARY OF THE INVENTION An object of the present invention is to provide a thin-film magnetic head that eliminates the drawbacks of the prior art and significantly reduces induced noise caused by an external magnetic field compared to a case where a coil is wound only around the main pole.
（問題点を解決するための手段）
本発明の薄膜磁気ヘッドは、主磁極とこの主磁極に磁気
的に接続した還流磁極と、前記主磁極に鎖交するコイル
よりなる垂直記録再生用の磁気ヘッドにおいて、前記コ
イルは主磁極と還流磁極に分割して巻かれ外部磁界によ
り、前記それぞれのコイルに生じる電圧がほぼ等しく逆
向きになるものである。(Means for Solving the Problems) The thin film magnetic head of the present invention has a magnetic field for perpendicular recording and reproducing, which comprises a main magnetic pole, a return magnetic pole magnetically connected to the main magnetic pole, and a coil linked to the main magnetic pole. In the head, the coil is divided into a main magnetic pole and a return magnetic pole, and an external magnetic field causes voltages generated in each coil to be approximately equal and in opposite directions.
（作 用）
外部磁界により主磁極と還流磁極中に誘起される磁束の
変化によってコイルに生じる電圧がほぼ等しく逆向きに
なるようにコイルが巻かれているので、互いに打消し合
い、はとんど検出されない。(Function) The coil is wound so that the voltages generated in the coil due to changes in the magnetic flux induced in the main magnetic pole and the return magnetic pole by an external magnetic field are almost equal and opposite in direction, so they cancel each other out and generate a high voltage. It is not detected.
一方垂直異方性膜から生じる信号磁束は、一方の磁極で
は外部磁束と同方向に、他の磁極では逆方向になるため
、信号磁束の変化によりコイルに生じる電圧は同じ向き
であり、互いに加えられるため媒体上の信号磁化を効率
よく再生できる。On the other hand, the signal magnetic flux generated from the vertically anisotropic film is in the same direction as the external magnetic flux at one magnetic pole and in the opposite direction at the other magnetic pole, so the voltages generated in the coil due to changes in the signal magnetic flux are in the same direction and are Therefore, the signal magnetization on the medium can be efficiently reproduced.
（実施例）
本発明の実施例を第１図ないし第３図に基づいて説明す
る。第１図は本発明の第１の実施例であり、ヘッド走行
方向よりヘッドを見た図である。(Example) An example of the present invention will be described based on FIGS. 1 to 3. FIG. 1 shows a first embodiment of the present invention, and is a view of the head viewed from the head running direction.
同図において、非磁性基板（図示せず）上にＣｏ −Ｎ
ｂ−Ｚｒアモルファス磁性体よりなる厚さ１．５μｍの
主磁極１と還流磁極２が形成される。主磁極１の先端の
媒体に接する部分は主磁極の厚さ損失を考慮して厚さ０
．２ｐ−に形成されており１幅は主磁極１゜還流磁極２
ともＩＯｐｍである。３はコイルであり、垂直異方性１
１４．高透磁率膜５、フ４ルム６で垂直記録媒体７を形
成している。８は磁束である。In the figure, Co-N is deposited on a non-magnetic substrate (not shown).
A main magnetic pole 1 and a reflux magnetic pole 2 having a thickness of 1.5 μm are formed from b-Zr amorphous magnetic material. The tip of main pole 1 has a thickness of 0 in consideration of the thickness loss of the main pole.
．． It is formed as 2p-, and 1 width is main magnetic pole 1° and return magnetic pole 2.
Both are IOpm. 3 is a coil, with vertical anisotropy 1
14. A perpendicular recording medium 7 is formed by the high magnetic permeability film 5 and the film 6. 8 is magnetic flux.
還流磁極２の先端は垂直異方性膜４への磁界の集中を避
けるために、媒体摺動面より８ｐ■さがっている。主磁
極１と還流磁極２の断面積は等しいので、外部磁界９に
よりそれぞれの磁極に誘起される磁束１０−１．１０−
２はほぼ等しいと考えられ、コイル３の巻数はそれぞれ
同じ＜１．５ターンである。The tip of the return magnetic pole 2 is lowered by 8p from the medium sliding surface in order to avoid concentration of the magnetic field on the perpendicular anisotropic film 4. Since the cross-sectional areas of the main magnetic pole 1 and the return magnetic pole 2 are equal, the magnetic flux 10-1.10- induced in each magnetic pole by the external magnetic field 9
2 are considered approximately equal, and the number of turns of the coils 3 is the same in each case <1.5 turns.
本発明のヘッドでは、従来例のヘッドと比べてコイルの
総巻数が等しい場合、媒体に垂直方向の外部磁界によっ
て生じるノイズは１／ｌＯ以下である。In the head of the present invention, when the total number of turns of the coil is the same as in the conventional head, the noise generated by the external magnetic field perpendicular to the medium is 1/1O or less.
第２図は本発明の第２の実施例である。同図はヘッドの
トラック幅方向に垂直な断面図である。FIG. 2 shows a second embodiment of the invention. This figure is a cross-sectional view of the head perpendicular to the track width direction.
フオトセラムなどの非磁性基板ｌｌ上にＡ６０３やＳ１
０．などの非磁性絶縁材１２．１３を介してセンダスト
やアモルファス磁性材からなる主磁極１４が形成される
。主磁極１４の厚さは２ｐ■で、先端は０．３μ閣に形
成されている。さらに主磁極１４と同様の材料で厚さ４
ｐ園の還流磁極１５が形成される。主磁極１４にはＡＱ
やＣｕなどからなるコイル１６−１が巻かれ還流磁極１
５にはコイル１６−２が巻かれる。還流磁極１５の厚さ
は主磁極１４の厚さの２倍であり、コイル１６−１の巻
数２ターンに対してコイル１６−２の巻数は４ターンで
ある。さらに図示しないが、非磁性の保護膜を介して保
護カバーを接着してヘッドとなる０本実施例のヘッドも
外部磁界により発生するノイズが小さい。A603 or S1 on a non-magnetic substrate such as photoceram
0. A main magnetic pole 14 made of sendust or an amorphous magnetic material is formed via a non-magnetic insulating material 12, 13 such as. The thickness of the main magnetic pole 14 is 2p, and the tip is formed to have a thickness of 0.3μ. Furthermore, it is made of the same material as the main magnetic pole 14 and has a thickness of 4 mm.
A p-type reflux magnetic pole 15 is formed. Main magnetic pole 14 has AQ
A coil 16-1 made of copper or Cu is wound around the reflux magnetic pole 1.
A coil 16-2 is wound around the coil 5. The thickness of the return magnetic pole 15 is twice the thickness of the main magnetic pole 14, and the number of turns of the coil 16-2 is 4 turns compared to 2 turns of the coil 16-1. Furthermore, although not shown, the head of this embodiment, which is formed by adhering a protective cover via a non-magnetic protective film, also has low noise generated by external magnetic fields.
上記実施例では、コイルの巻数は磁極の断面積に反比例
して決められたが、実際には磁極の形状により外部磁界
の影響が最小になるように調節される。In the above embodiment, the number of turns of the coil was determined in inverse proportion to the cross-sectional area of the magnetic pole, but in reality it is adjusted depending on the shape of the magnetic pole so that the influence of the external magnetic field is minimized.
また、第２の実施例では還流磁極１５に巻いたコイル１
６−２は主磁極に巻いたコイル１６−１と平行であった
が、第３図に示すように還流磁極のつけ根の部分に巻い
たコイル１７−２でも同様な効果が得られる。In addition, in the second embodiment, the coil 1 wound around the return magnetic pole 15
6-2 is parallel to the coil 16-1 wound around the main magnetic pole, but the same effect can be obtained with a coil 17-2 wound around the base of the return magnetic pole as shown in FIG.
（発明の効果）
本発明によれば、主磁極と還流磁極に巻いたコイルの巻
数を適当に選ぶことにより、外部磁界により生じる誘導
ノイズを主磁極だけにコイルを巻いた従来例と比較して
大幅に減らすことができる。(Effects of the Invention) According to the present invention, by appropriately selecting the number of turns of the coil wound around the main magnetic pole and the return magnetic pole, induction noise caused by an external magnetic field can be reduced compared to the conventional example in which a coil is wound only around the main magnetic pole. can be significantly reduced.
第１図は本発明の第１の実施例のヘッドの正面図、第２
図および第３図は本発明の第２の実施例のヘッドの断面
図、第４図は従来のヘッドの正面図である。
１．１４・・・主磁極、２．１５・・・還流磁極。
３ 、１６−１ 、１６−２ 、１７−１ 、１７−２
・・・コイル。
４・・・垂直異方性膜、 ５・・・高透磁率膜、６・・
・フィルム、 ７・・・垂直記録媒体。
８ 、１０−１ 、１０−２・・・磁束、 ９・・・外
部磁界、１１・・・非磁性基板、 １２．１３・・・非
磁性絶縁材。
特許出願人 松下電器産業株式会社
第１図
１０−１．１０−２、− ｍＭ。
第２図
第４図
料２９FIG. 1 is a front view of the head of the first embodiment of the present invention, and FIG.
3 and 3 are cross-sectional views of a head according to a second embodiment of the present invention, and FIG. 4 is a front view of a conventional head. 1.14... Main magnetic pole, 2.15... Return magnetic pole. 3, 16-1, 16-2, 17-1, 17-2
···coil. 4... Vertical anisotropic film, 5... High magnetic permeability film, 6...
・Film, 7... Perpendicular recording medium. 8, 10-1, 10-2...Magnetic flux, 9...External magnetic field, 11...Nonmagnetic substrate, 12.13...Nonmagnetic insulating material. Patent applicant Matsushita Electric Industrial Co., Ltd. Figure 1 10-1.10-2, -mM. Figure 2 Figure 4 Fee 29
Claims (1)
記主磁極に鎖交するコイルよりなる垂直記録再生用の磁
気ヘッドにおいて、前記コイルは主磁極と還流磁極に分
割して巻かれ、外部磁界により、前記おのおののコイル
に生じる電圧がほぼ等しく逆向きであることを特徴とす
る薄膜磁気ヘッド。In a magnetic head for perpendicular recording and reproducing that includes a main magnetic pole, a return magnetic pole magnetically connected to the main magnetic pole, and a coil interlinked with the main magnetic pole, the coil is divided into the main pole and the return magnetic pole and is wound. . A thin film magnetic head, characterized in that voltages generated in each of the coils by an external magnetic field are approximately equal and in opposite directions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10320386A JPS62262212A (en) | 1986-05-07 | 1986-05-07 | Thin film magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10320386A JPS62262212A (en) | 1986-05-07 | 1986-05-07 | Thin film magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62262212A true JPS62262212A (en) | 1987-11-14 |
Family
ID=14347959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10320386A Pending JPS62262212A (en) | 1986-05-07 | 1986-05-07 | Thin film magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62262212A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0353304A1 (en) * | 1987-12-28 | 1990-02-07 | Nippon Hoso Kyokai | Thin-film magnetic head and method of producing the same |
| EP0360978A2 (en) * | 1988-09-27 | 1990-04-04 | Fujitsu Limited | A thin film magnetic head for perpendicular recording and reproducing |
| GB2407201A (en) * | 2003-10-17 | 2005-04-20 | Alps Electric Co Ltd | Perpendicular magnetic head with reduced fringing |
-
1986
- 1986-05-07 JP JP10320386A patent/JPS62262212A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0353304A1 (en) * | 1987-12-28 | 1990-02-07 | Nippon Hoso Kyokai | Thin-film magnetic head and method of producing the same |
| EP0353304A4 (en) * | 1987-12-28 | 1991-07-03 | Nippon Hoso Kyokai | Thin-film magnetic head and method of producing the same |
| EP0360978A2 (en) * | 1988-09-27 | 1990-04-04 | Fujitsu Limited | A thin film magnetic head for perpendicular recording and reproducing |
| GB2407201A (en) * | 2003-10-17 | 2005-04-20 | Alps Electric Co Ltd | Perpendicular magnetic head with reduced fringing |
| GB2407201B (en) * | 2003-10-17 | 2007-05-23 | Alps Electric Co Ltd | Magnetic head |
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