JPH02270106A - thin film magnetic head - Google Patents
thin film magnetic headInfo
- Publication number
- JPH02270106A JPH02270106A JP1091328A JP9132889A JPH02270106A JP H02270106 A JPH02270106 A JP H02270106A JP 1091328 A JP1091328 A JP 1091328A JP 9132889 A JP9132889 A JP 9132889A JP H02270106 A JPH02270106 A JP H02270106A
- Authority
- JP
- Japan
- Prior art keywords
- thin film
- conductive coil
- magnetoresistive element
- magnetic
- magnetic pole
- 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
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/3967—Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read
Landscapes
- Magnetic Heads (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は磁気記録装置の磁気ヘッドに間するもので、特
に記録及び再生兼用であり、高再生出力、低記録電流を
もつ薄膜磁気ヘッドに間するものである。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a magnetic head of a magnetic recording device, and is particularly applicable to a thin film magnetic head that is used for both recording and reproduction, and has a high reproduction output and a low recording current. It is something.
従来の技術
従来の澤膜ヘッドの構造を第２図、第３図に基づき説明
する。BACKGROUND OF THE INVENTION The structure of a conventional saw film head will be explained with reference to FIGS. 2 and 3.
第２図は巻線型薄膜ヘッドの一例を示しその断面図であ
る０図示のごとく下部磁性体磁極２と、その上にギャッ
プ層３を介して形成される第１の絶縁層４と、その上に
形成される導電コイル５と、その上に形成される第２の
絶縁層６と、その上に形成される上部磁性体磁極９とを
積層して構成される。FIG. 2 is a cross-sectional view of an example of a wire-wound thin film head. As shown in FIG. The conductive coil 5 is formed by laminating a conductive coil 5, a second insulating layer 6 formed thereon, and an upper magnetic pole 9 formed thereon.
第２図のごとき巻線型のヘッドにおいては、その再生出
力を増大させるには媒体との相対速度を増加させるか巻
線数を増加させねばならず、その製造技術は限界に近づ
きつつある。In the wire-wound head shown in FIG. 2, in order to increase its reproduction output, it is necessary to increase the relative speed with the medium or increase the number of windings, and the manufacturing technology is approaching its limit.
このような問題を解決するために、第３図に示すような
巻線型と磁気抵抗効果型を合わせた薄膜磁気ヘッドが提
案されている（特開昭６ｌ−４８１１６）。In order to solve this problem, a thin film magnetic head combining a wire-wound type and a magnetoresistive type as shown in FIG. 3 has been proposed (Japanese Patent Laid-Open No. 61-48116).
この磁気ヘッドは、第２図に示した巻線型のヘッドの磁
気回路を形成する下部磁性体磁極２あるいは上部磁性体
磁極９の一部に磁気抵抗効果素子７が挿入されたもので
あり、記録は導電コイル５に通電して行い、再生は磁気
抵抗効果素子７によるものである。このような複合型の
ヘッドでは再生出力は巻線型に比較して約１０倍大きく
、しかも記録も可能である。This magnetic head has a magnetoresistive element 7 inserted into a part of the lower magnetic pole 2 or the upper magnetic pole 9 forming the magnetic circuit of the wire-wound head shown in FIG. is performed by energizing the conductive coil 5, and reproduction is performed by the magnetoresistive element 7. In such a composite type head, the reproduction output is about 10 times greater than that of the wire-wound type head, and it is also capable of recording.
発明が解決しようとする課題
しかし、磁気抵抗効果型のヘッドにおいては再生出力の
直線性を良くするためにバイアス磁界が必要である。前
記従来例では、導電コイルに微小電流を流すことによっ
てこれを行なうことが提案されているが、このとき同時
に発生する磁気ギャップからの漏れ磁界によって、記録
媒体に記録された信号磁化が再生中に減磁するおそれが
ある。Problems to be Solved by the Invention However, a magnetoresistive head requires a bias magnetic field in order to improve the linearity of the reproduction output. In the conventional example, it is proposed that this is done by passing a minute current through the conductive coil, but the leakage magnetic field from the magnetic gap that occurs at the same time causes the signal magnetization recorded on the recording medium to change during playback. There is a risk of demagnetization.
本発明は前記磁気ヘッドの課題を解決した高性能な薄膜
磁気ヘッドを提供することを目的とするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a high-performance thin film magnetic head that solves the above problems of the magnetic head.
課題を解決するための手段
本発明は、下部磁性体磁極、第１の絶縁層、導電コイル
、第２の絶縁層、上部磁性体磁極が順次積層して形成さ
れた薄膜磁気ヘッドにおいて、前記下部磁性体磁極およ
び上部磁性体磁極で形成される磁気回路の一部に磁気抵
抗効果素子が挿入され、前記導電コイルのうち前記磁気
抵抗効果素子に近接した部分のみに通電できるリードが
前記導電コイルに接続され、前記磁気抵抗効果素子のバ
イアス磁界発生用として使用される薄膜磁気ヘッドであ
る。Means for Solving the Problems The present invention provides a thin film magnetic head formed by sequentially laminating a lower magnetic pole, a first insulating layer, a conductive coil, a second insulating layer, and an upper magnetic pole. A magnetoresistive element is inserted into a part of a magnetic circuit formed by a magnetic pole and an upper magnetic pole, and a lead that can energize only a portion of the conductive coil that is close to the magnetoresistive element is connected to the conductive coil. A thin film magnetic head is connected to the magnetoresistive element and used for generating a bias magnetic field for the magnetoresistive element.
作用
本発明は、記録時は導電コイル全体に通電することによ
り、磁気ギャップからは大きな漏れ磁界が発生し、記録
媒体に記録できる。一方、再生時には導電コイルのうち
磁気抵抗効果素子に近接した部分のみに通電できるため
、磁気抵抗効果素子に効率良くバイアス磁界が印加でき
、磁気ギャップからの漏れ磁界は減少する。このため記
録媒体に記録された信号磁化の再生時の減磁は抑えられ
る。In the present invention, during recording, by energizing the entire conductive coil, a large leakage magnetic field is generated from the magnetic gap, and recording can be performed on the recording medium. On the other hand, during reproduction, only the part of the conductive coil that is close to the magnetoresistive element can be energized, so that a bias magnetic field can be efficiently applied to the magnetoresistive element, and the leakage magnetic field from the magnetic gap is reduced. Therefore, demagnetization during reproduction of signal magnetization recorded on the recording medium can be suppressed.
実施例
以下に、本発明の実施例について図面を参照しながら説
明する。Examples Examples of the present invention will be described below with reference to the drawings.
第１図（Ａ）、（Ｂ）、（Ｃ）は本発明のＮ膜磁気ヘッ
ドを示すものであって、同図（Ａ）は平面図、同図（Ｂ
）は同図（Ａ）のＡ−Ａ断面、同図（Ｃ）は同図（Ａ）
のＢ−Ｂ断面である。第１図中で、第２〜第３図と同一
記号は同一構成要素を示す。第１図において、基板１の
上に下部磁性体磁極２を形成し、所定形状にバターニン
グする。FIGS. 1(A), 1(B), and 1(C) show an N-film magnetic head of the present invention, in which FIG. 1(A) is a plan view and FIG.
) is the A-A cross section of the same figure (A), and the same figure (C) is the same figure (A)
This is a cross section taken along line B-B. In FIG. 1, the same symbols as in FIGS. 2 and 3 indicate the same components. In FIG. 1, a lower magnetic pole 2 is formed on a substrate 1 and patterned into a predetermined shape.
次に、前記下部磁性体磁極２上のへラドギャップが構成
される部分に、所定厚のギャップ層３を形成し、その上
に第１の絶縁Ｎ４を形成し、その上に導電コイル５を形
成する。更に、第２の絶！ｌＮ６を形成し、その上に磁
気抵抗効果素子７およびそのリード８および上部磁性体
磁極９を形成する。Next, a gap layer 3 of a predetermined thickness is formed on the lower magnetic pole 2 at a portion where the Herad gap is formed, a first insulation N4 is formed on it, and a conductive coil 5 is placed on it. Form. Furthermore, the second absolute! 1N6 is formed, and the magnetoresistive element 7, its leads 8, and the upper magnetic pole 9 are formed thereon.
次に第２の絶縁層６にスルーホールｌＯを形成し、リー
ド１１を接続する。なお、磁気抵抗効果素子７に効率良
くバイアス磁界が印加できるように磁気抵抗効果素子７
の直下にある第２の絶縁層６はできるだけ薄くすること
が望ましい。Next, a through hole IO is formed in the second insulating layer 6, and a lead 11 is connected thereto. Note that the magnetoresistive element 7 is designed to efficiently apply a bias magnetic field to the magnetoresistive element 7.
It is desirable to make the second insulating layer 6 directly below as thin as possible.
以上の各薄膜プロセスにおいて、下部磁性体磁極２およ
び上部磁性体磁極９としてはパーマロイ、センダスト、
アモルファスなどの真空蒸着膜もしくはスパッタ膜が、
磁気抵抗効果素子材料としてはパーマロイやＮｉ−Ｃｏ
の真空蒸着膜もしくはスパッタ膜が、また導電コイル層
、リードとしては、Ｃｕ、 ＡＩ、Ａｕなどの真空蒸着
膜もしくは電着膜が、絶縁層としてはＳｉＯ２やＡｌ２
Ｏ３のスパッタ膜もしくはフォトレジスト等の有機絶縁
材が適する。In each of the above thin film processes, the lower magnetic pole 2 and the upper magnetic pole 9 are made of permalloy, sendust,
Vacuum deposited film or sputtered film such as amorphous
Permalloy and Ni-Co are used as magnetoresistive element materials.
A vacuum-deposited film or a sputtered film of Cu, AI, Au, etc. is used as the conductive coil layer and the lead, and a vacuum-deposited film or electrodeposited film of Cu, AI, Au, etc. is used as the insulating layer.
An organic insulating material such as an O3 sputtered film or a photoresist is suitable.
次に、上記実施例の動作について述べる。Next, the operation of the above embodiment will be described.
記録時は、導電コイル層
気ギャップ３からの漏れ磁界で記録媒体を磁化する。こ
のとき導電コイル５に接続されたり一部１１は電気的に
閏の状態にしておく。再生時は、導電コイル５に接続さ
′れたリード１１に微小電流を流して磁気抵抗効果素子
７にバイアス磁界を印加して再生する。このとき導電コ
イル５は信号電流を流す回路とは接続されていない状態
にしておく。During recording, the recording medium is magnetized by the leakage magnetic field from the conductive coil layer gap 3. At this time, the part 11 connected to the conductive coil 5 is kept in an electrically connected state. During reproduction, a minute current is passed through the lead 11 connected to the conductive coil 5 to apply a bias magnetic field to the magnetoresistive element 7 for reproduction. At this time, the conductive coil 5 is kept in a state where it is not connected to a circuit through which a signal current flows.
このようにして磁気記録及び再生を行う。In this way, magnetic recording and reproduction are performed.
発明の効果
本発明によれば、記録効率のよい巻線型薄膜磁気ヘッド
と、再生出力の高い磁気抵抗効果型ヘツドが併設され、
記録および再生が同一ヘッドで行なわれる薄膜磁気ヘッ
ドにおいて、バイアス磁界発生用の導電コイルとして、
記録磁界発生用の導電コイルのうち磁気抵抗効果素子に
近接した部分のみを使用するので、磁気抵抗効果素子に
効率良くバイアス磁界が印加でき、再生時に磁気ギャッ
プからの漏れ磁界によって記録媒体に記録された信号磁
化を減磁することが抑えられる。またバイアス磁界発生
用としての導電層あるいは別のバイアス磁界印加手段を
設ける必要が無いので構造および製造工程が簡略になる
という長所を有する。Effects of the Invention According to the present invention, a wire-wound thin film magnetic head with high recording efficiency and a magnetoresistive head with high reproduction output are installed together,
In a thin film magnetic head where recording and reproduction are performed with the same head, as a conductive coil for generating a bias magnetic field,
Since only the part of the conductive coil for generating the recording magnetic field that is close to the magnetoresistive element is used, a bias magnetic field can be efficiently applied to the magnetoresistive element, and during reproduction, the magnetic field leaked from the magnetic gap is used to record on the recording medium. Demagnetization of signal magnetization can be suppressed. Further, since there is no need to provide a conductive layer for generating a bias magnetic field or a separate bias magnetic field applying means, it has the advantage that the structure and manufacturing process are simplified.
第１図は本発明にかかる薄膜磁気ヘッドの一実施例を示
す図、第２図および第３図は従来例を示す断面図である
。
１・・・基板、２・・・下部磁性体磁極、３・・・ギャ
ップ層、４．６・・・絶縁層、５・・・導電コイル、７
・・・磁気抵抗効果素子、８．１１・・・リード、９・
・・上部磁性体磁極、１０・・・スルーホール。
代理人の氏名 弁理士 粟野重孝はか１名第１図
（Ｂ）
（Ｃ）FIG. 1 is a diagram showing an embodiment of a thin film magnetic head according to the present invention, and FIGS. 2 and 3 are sectional views showing a conventional example. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Lower magnetic pole, 3... Gap layer, 4.6... Insulating layer, 5... Conductive coil, 7
... Magnetoresistive element, 8.11... Lead, 9.
...Top magnetic pole, 10...Through hole. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure 1
(B) (C)
Claims (1)
縁層、上部磁性体磁極が順次積層して形成された薄膜磁
気ヘッドにおいて、前記下部磁性体磁極および上部磁性
体磁極で形成される磁気回路の一部に磁気抵抗効果素子
が挿入され、前記導電コイルのうち前記磁気抵抗効果素
子に近接した部分のみに通電できるリードが前記導電コ
イルに接続され、前記磁気抵抗効果素子のバイアス磁界
発生用として使用されることを特徴とする薄膜磁気ヘッ
ド。In a thin film magnetic head formed by sequentially laminating a lower magnetic pole, a first insulating layer, a conductive coil, a second insulating layer, and an upper magnetic pole, the lower magnetic pole and the upper magnetic pole may A magnetoresistive element is inserted into a part of a magnetic circuit, and a lead that can conduct electricity only to a portion of the conductive coil that is close to the magnetoresistive element is connected to the conductive coil, and the bias magnetic field of the magnetoresistive element is A thin film magnetic head characterized in that it is used for generation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1091328A JPH02270106A (en) | 1989-04-11 | 1989-04-11 | thin film magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1091328A JPH02270106A (en) | 1989-04-11 | 1989-04-11 | thin film magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02270106A true JPH02270106A (en) | 1990-11-05 |
Family
ID=14023384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1091328A Pending JPH02270106A (en) | 1989-04-11 | 1989-04-11 | thin film magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02270106A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6001535A (en) * | 1993-07-22 | 1999-12-14 | Agfa Gevaert Ag | Monomers with cyclic carbonate groups |
-
1989
- 1989-04-11 JP JP1091328A patent/JPH02270106A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6001535A (en) * | 1993-07-22 | 1999-12-14 | Agfa Gevaert Ag | Monomers with cyclic carbonate groups |
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