JPH0191384A - Thin film magnetic head assembling body - Google Patents
Thin film magnetic head assembling bodyInfo
- Publication number
- JPH0191384A JPH0191384A JP24710687A JP24710687A JPH0191384A JP H0191384 A JPH0191384 A JP H0191384A JP 24710687 A JP24710687 A JP 24710687A JP 24710687 A JP24710687 A JP 24710687A JP H0191384 A JPH0191384 A JP H0191384A
- Authority
- JP
- Japan
- Prior art keywords
- thin film
- slider
- stripe
- magnetic
- magnetic 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 55
- 230000000694 effects Effects 0.000 claims description 6
- 239000000428 dust Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract 1
- 230000006378 damage Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Landscapes
- Magnetic Heads (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は簿膜磁気ヘッド組立体に関し、特に磁気ディス
ク装置に用いられ薄膜磁気ヘッドスライダと磁気ディス
ク板との接触障害事故を未然に検出できる薄膜磁気ヘッ
ド組立体に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a thin film magnetic head assembly, and is particularly used in a magnetic disk device, and is capable of detecting contact failure accidents between a thin film magnetic head slider and a magnetic disk plate. The present invention relates to a thin film magnetic head assembly.
従来の一般的薄膜磁気ヘッド組立体について第２図を用
いて説明する。A conventional general thin film magnetic head assembly will be explained with reference to FIG.
第２図は従来の薄膜磁気ヘッド組立体中の薄膜磁気ヘッ
ドスライダ１と磁気ディスク板２との使用状態での位置
関係を示す断面図である。薄膜磁気ヘッドスライダ１は
磁気ディスク板２と図示するｈの浮上量を保って浮上し
ている。この浮上量りは薄膜磁気ヘッドスライダ１の後
端部つまり薄膜素子３がある部分で最も小さい。このた
め、ゴミあるいは磁気ディスク板上の突起などは多くの
場合、前記後端部に衝突し薄膜素子３を傷付は著しくは
簿膜磁気ヘッドスライダ１そのものの浮上機能を低下せ
しめる。最後には薄膜磁気ヘッドスライダ１と磁気ディ
スク板２が定常的に接触、摩耗するようになり、正常な
記録再生動作が不可能になる。また場合によってはすで
にデータの記録しである磁性面を傷付は永久的にデータ
の読み出しが不可能になることもある。FIG. 2 is a cross-sectional view showing the positional relationship between the thin-film magnetic head slider 1 and the magnetic disk plate 2 in a conventional thin-film magnetic head assembly during use. The thin film magnetic head slider 1 is floating with the magnetic disk plate 2 at a flying height h shown in the figure. The flying height is smallest at the rear end of the thin-film magnetic head slider 1, that is, at the portion where the thin-film element 3 is located. Therefore, in many cases, dust or protrusions on the magnetic disk plate collide with the rear end, damaging the thin film element 3 and significantly reducing the flying function of the film magnetic head slider 1 itself. Eventually, the thin film magnetic head slider 1 and the magnetic disk plate 2 come into constant contact and wear, making normal recording and reproducing operations impossible. In some cases, if the magnetic surface on which data is already recorded is damaged, it may become permanently impossible to read the data.
上述した従来の薄膜磁気ヘッド組立体では何らかの原因
で浮上が不可能になり磁気ディスク板を傷付は始めても
直ちにその状態を検出すること１よ不可能であった。検
出できるのは唯一、データを再生しようとして全く再生
が不可能であった場合であるが、この場合にはすでに磁
気ディスク板の磁性面は傷付いており回復は不可能であ
る。In the conventional thin-film magnetic head assembly described above, even if flying becomes impossible for some reason and the magnetic disk plate begins to be damaged, it is impossible to immediately detect this condition. The only case that can be detected is when an attempt is made to reproduce data but it is not possible to reproduce it at all, but in this case the magnetic surface of the magnetic disk plate has already been damaged and recovery is impossible.
このように従来の薄膜磁気ヘッド組立体では磁気ディス
ク板を傷付は始めてもその状況を磁気ディスク装置の外
部より知ることは不可能であり。As described above, in the conventional thin film magnetic head assembly, even if the magnetic disk plate is damaged, it is impossible to know the situation from outside the magnetic disk drive.
データ自体が損なわれて始めて事故が判明するという欠
点がある。The drawback is that an accident is only discovered when the data itself is damaged.
本発明の目的は前記問題点を解消した磁気ヘッド組立体
を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head assembly that eliminates the above-mentioned problems.
本発明は磁歪定数の絶対値が５ Ｘ １０−’より大き
く、かつ磁気抵抗効果を持つ磁性薄膜パターンを具備し
た薄膜磁気ヘッドスライダと、前記磁性薄膜パターンの
機械的振動に起因する電気抵抗変化を電気信号に変換す
る回路とを有することを特徴とする薄膜磁気ヘッド組立
体である。The present invention provides a thin-film magnetic head slider having a magnetic thin-film pattern with an absolute value of a magnetostriction constant larger than 5 x 10-' and having a magnetoresistive effect, and a thin-film magnetic head slider having a magnetic thin-film pattern having an absolute value of a magnetostriction constant of more than 5 x 10-', and a magnetic thin-film head slider having a magnetoresistive effect. 1. A thin film magnetic head assembly characterized by having a circuit for converting into an electric signal.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の薄膜磁気ヘッド組立体中に含まれる薄
膜磁気ヘッドスライダを示す斜視図である。第１図にお
いて、スライダ４の後端に位置する薄膜素子５は従来と
同様に磁性薄膜、絶縁物。FIG. 1 is a perspective view showing a thin film magnetic head slider included in the thin film magnetic head assembly of the present invention. In FIG. 1, the thin film element 5 located at the rear end of the slider 4 is a magnetic thin film or an insulator as in the conventional case.
コイル導電膜を積層して形成される。ここで、従来と異
なる点は薄膜素子の形成プロセスと同等の技術により作
成されたＮｉＦｅに代表される磁気抵抗効果を有し磁性
薄膜ストライプ６を有することにある。本実施例では磁
性薄膜ストライプ６の両端からの引き出しパターンは端
子７に電気的に接続され、さらに端子７よりリード線を
介して薄膜磁気ヘッドスライダ外部へ導かれる。The coil is formed by laminating conductive films. Here, the difference from the conventional method is that it has a magnetic thin film stripe 6 having a magnetoresistive effect represented by NiFe, which is made using the same technology as the thin film element forming process. In this embodiment, the lead patterns from both ends of the magnetic thin film stripe 6 are electrically connected to a terminal 7, and further guided from the terminal 7 to the outside of the thin film magnetic head slider via a lead wire.
磁気抵抗効果を有する磁性薄膜は一般的に外部磁場によ
り磁性薄膜内部の磁化状態が変化し、その結果電気抵抗
が変化する性質を持つ。内部の磁化状態の変化は外部磁
場のみによって生じるのみならず、もしその磁性薄膜の
磁歪定数が大きな場合には外部より加わった力による磁
性簿膜の微小な歪によっても起きろる。本実施例ではこ
の原理を応用し磁歪定数の絶対値が５Ｘ１０−’以上の
磁性薄膜ストライプ６をスライダ４の後端に配置し。A magnetic thin film having a magnetoresistive effect generally has the property that the magnetization state inside the magnetic thin film changes due to an external magnetic field, and as a result, the electrical resistance changes. Changes in the internal magnetization state are caused not only by an external magnetic field, but also by minute distortions in the magnetic thin film due to external forces if the magnetostriction constant of the magnetic thin film is large. In this embodiment, this principle is applied to arrange a magnetic thin film stripe 6 having an absolute value of a magnetostriction constant of 5X10-' or more at the rear end of the slider 4.
スライダ４に加わる振動を検出しようとするものである
。This is intended to detect vibrations applied to the slider 4.
今、ゴミ、異物等の原因によりスライダ４が正常に浮上
できなくなり磁気ディスク板２に接触し始めると数１０
１１ｚから数１０ＫＨｚの衝撃振動がスライダ４に加わ
る。Now, if the slider 4 is unable to fly normally due to dust, foreign matter, etc. and starts to come into contact with the magnetic disk plate 2, the number of
Shock vibrations from 11z to several tens of KHz are applied to the slider 4.
この振動は微少にスライダ４をたわませたり、よじった
りし、結果的に磁性薄膜ストライプ６を歪ませる。この
微少な歪により磁性薄膜ストライプ６の電気抵抗が変化
し、外部より電流を供給しておけば電圧の変化として検
出することができる。This vibration slightly bends or twists the slider 4, resulting in distortion of the magnetic thin film stripe 6. This minute strain causes a change in the electrical resistance of the magnetic thin film stripe 6, which can be detected as a change in voltage if a current is supplied from the outside.
第３図は前記磁性薄膜ストライプ６の電気抵抗変化を検
出する回路の概念を示している。電圧源８により磁性薄
膜ストライプ６に電流が供給され、歪による磁性薄膜ス
トライプ６の抵抗変化は電圧変化となりアンプ９により
増幅される。アンプ９よりの出力は検波器１０により極
性がそろえられコンパレータ１１により前以て定めであ
る設定電圧１２と比較され、設定電圧１２を超える変化
があった場合に端子１３に出力される。FIG. 3 shows the concept of a circuit for detecting changes in electrical resistance of the magnetic thin film stripe 6. A current is supplied to the magnetic thin film stripe 6 by a voltage source 8, and a change in resistance of the magnetic thin film stripe 6 due to strain becomes a voltage change and is amplified by an amplifier 9. The polarity of the output from the amplifier 9 is aligned by a detector 10 and compared with a predetermined set voltage 12 by a comparator 11. If there is a change exceeding the set voltage 12, the output is output to a terminal 13.
」−記原理によりスライダ４に加わる機械的な衝撃力に
よる振動を電気信号として取り出すことができる、また
第３図に概念的に示した回路は集積回路化することによ
り非常に小さくでき、従来より用いられている磁気ヘッ
ド用書込再生ＩＣのチップ上に無理なく付加できる。こ
のような複合ＩＣを簿膜磁気ヘッド組立体中に具備する
ことにより薄膜磁気ヘッド組立体中に複数個のスライダ
を有する場合でもそれぞれのスライダの有する磁性薄膜
ストライプ６よりの信号をよりコンパクトな構成で処理
することができる。” - Based on the principle described above, vibrations caused by the mechanical impact force applied to the slider 4 can be extracted as an electrical signal.The circuit conceptually shown in Figure 3 can be made extremely small by integrating it, and is much smaller than the conventional circuit. It can be easily added to the chip of the write/reproduce IC for the magnetic head currently in use. By providing such a composite IC in the thin film magnetic head assembly, even if the thin film magnetic head assembly has a plurality of sliders, the signals from the magnetic thin film stripes 6 of each slider can be arranged in a more compact structure. can be processed with.
以上説明したように本発明はスライダに磁性薄膜ストラ
イプを有し、この磁性薄膜ストライプに加わる機械的振
動による電気抵抗の変化を検出する集積回路を具備する
ことにより、スライダと磁気ディスク板との接触を電気
信号としてとらえることができる。磁気ディスク装置内
で本発明の薄膜磁気ヘッド組立体を使う場合、通常の書
込再生動作以外は常に前記検出用の集積回路よりの信号
をモニタしていることが望ましい。このようにすること
でスライダが磁気ディスク板を損傷させるほどの大きな
障害を起こす前に、スライダと磁気ディスク板の軽い接
触が発生した段階で障害の進行を知ることができる。前
記の接触に相当する信号が検出された場合、その発生装
置の記憶データをできるだけ早く他のバックアップメモ
リへ移送すると共にその後新規データの記憶を中止する
。As explained above, the present invention has a magnetic thin film stripe on the slider, and is equipped with an integrated circuit that detects changes in electrical resistance due to mechanical vibrations applied to the magnetic thin film stripe, so that contact between the slider and the magnetic disk plate is prevented. can be interpreted as an electrical signal. When using the thin film magnetic head assembly of the present invention in a magnetic disk drive, it is desirable to constantly monitor the signal from the detection integrated circuit except during normal write/reproduce operations. By doing this, it is possible to know the progress of a failure at the stage when a light contact between the slider and the magnetic disk plate occurs, before the slider causes a major failure that would damage the magnetic disk plate. If a signal corresponding to said contact is detected, the stored data of the generating device is transferred as soon as possible to another backup memory and storage of new data is then stopped.
このような処理ルーチンをコントローラ内のＲＯＭに粗
み込んでおくことにより、貴重な情報の破壊及び信頼性
の低下した記憶装置へのデータ蓄積を未然に防ぐことが
できる効果を有するものである。By storing such a processing routine in the ROM in the controller, it is possible to prevent the destruction of valuable information and the accumulation of data in an unreliable storage device.
第１図は本発明の薄膜磁気ヘッド組立体の中に含まれる
薄膜磁気ヘッドスライダを示す斜視図、第２図は従来の
薄膜磁気ヘッド組立体の中の薄膜磁気ヘッドスライダと
磁気ディスク板との使用状態での位置関係を示す断面図
、第３図は本発明において磁性薄膜ストライプの電気抵
抗変化を検出する回路図である。FIG. 1 is a perspective view showing a thin film magnetic head slider included in a thin film magnetic head assembly of the present invention, and FIG. 2 is a perspective view showing a thin film magnetic head slider and a magnetic disk plate in a conventional thin film magnetic head assembly. FIG. 3 is a cross-sectional view showing the positional relationship in use, and is a circuit diagram for detecting a change in electrical resistance of the magnetic thin film stripe in the present invention.
Claims (1)
、かつ磁気抵抗効果を持つ磁性薄膜パターンを具備した
薄膜磁気ヘッドスライダと、前記磁性薄膜パターンの機
械的振動に起因する電気抵抗変化を電気信号に変換する
回路とを有することを特徴とする薄膜磁気ヘッド組立体
。(1) A thin-film magnetic head slider equipped with a magnetic thin-film pattern whose absolute value of magnetostriction constant is larger than 5×10^-^6 and which has a magnetoresistive effect, and an electric resistance caused by mechanical vibration of the magnetic thin-film pattern. 1. A thin film magnetic head assembly comprising: a circuit for converting changes into electrical signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24710687A JPH0191384A (en) | 1987-09-30 | 1987-09-30 | Thin film magnetic head assembling body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24710687A JPH0191384A (en) | 1987-09-30 | 1987-09-30 | Thin film magnetic head assembling body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0191384A true JPH0191384A (en) | 1989-04-11 |
Family
ID=17158519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24710687A Pending JPH0191384A (en) | 1987-09-30 | 1987-09-30 | Thin film magnetic head assembling body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0191384A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6181520B1 (en) | 1997-07-04 | 2001-01-30 | Fujitsu Limited | Head slider and disk unit having contact detection means |
| US7564649B2 (en) * | 2005-04-27 | 2009-07-21 | Seagate Technology Llc | Head assembly having a sensing element to provide feedback for head-media instability |
| US8310779B2 (en) | 2005-04-27 | 2012-11-13 | Seagate Technology Llc | Head assembly having a sensing element |
-
1987
- 1987-09-30 JP JP24710687A patent/JPH0191384A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6181520B1 (en) | 1997-07-04 | 2001-01-30 | Fujitsu Limited | Head slider and disk unit having contact detection means |
| US7564649B2 (en) * | 2005-04-27 | 2009-07-21 | Seagate Technology Llc | Head assembly having a sensing element to provide feedback for head-media instability |
| US8310779B2 (en) | 2005-04-27 | 2012-11-13 | Seagate Technology Llc | Head assembly having a sensing element |
| US8837075B2 (en) | 2005-04-27 | 2014-09-16 | Seagate Technology Llc | Head assembly with head-media spacing control |
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