JPS62285212A - Thin film magnetic head - Google Patents
Thin film magnetic headInfo
- Publication number
- JPS62285212A JPS62285212A JP12717386A JP12717386A JPS62285212A JP S62285212 A JPS62285212 A JP S62285212A JP 12717386 A JP12717386 A JP 12717386A JP 12717386 A JP12717386 A JP 12717386A JP S62285212 A JPS62285212 A JP S62285212A
- Authority
- JP
- Japan
- Prior art keywords
- gap
- magnetic
- thin film
- tip
- 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 abstract description 19
- 239000000758 substrate Substances 0.000 claims description 12
- 230000000630 rising effect Effects 0.000 claims 1
- 229920006395 saturated elastomer Polymers 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000007740 vapor deposition 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
- G11B5/3116—Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks
-
- 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
Abstract
Description
【発明の詳細な説明】 ３、発明の詳細な説明 〈産業上の利用分野〉 本発明は、記録効率が常に良好で且つ使用ある。[Detailed description of the invention] 3. Detailed description of the invention <Industrial application field> The present invention always has good recording efficiency and is easy to use.
〈従来の技術〉
近年、薄膜磁気ヘッドが実用化されつつある。この薄膜
磁気ヘッドによれば、バルクヘッドでは実現できなかっ
た大幅な記録密度の向上が図れる。<Prior Art> In recent years, thin film magnetic heads have been put into practical use. According to this thin film magnetic head, it is possible to achieve a significant improvement in recording density that could not be achieved with a bulk head.
薄膜磁気ヘッドを作製する際には１次のような相反する
条件を満たす必要がある。即ち、
（ａ） 効率よく記録するためにはギャップの先端が
磁気飽和していなければならない。このとき、ギャップ
デプスが長ずざると、どんな大きな記録電流を流しても
ギャップ先端が磁気飽和しない。結局、ギャップデプス
が短い方が磁気飽和しやすく高い記録効率を確保できる
。When manufacturing a thin film magnetic head, it is necessary to satisfy contradictory conditions such as the first order. That is, (a) For efficient recording, the tip of the gap must be magnetically saturated. At this time, unless the gap depth is long, the tip of the gap will not be magnetically saturated no matter how large the recording current is applied. After all, the shorter the gap depth, the easier magnetic saturation will occur and higher recording efficiency can be ensured.
（ｂ） 薄膜磁気ヘッドは、使用するにつれ、記録媒
体との接触によりギャップ先端から摩耗していく。した
がって使用寿命の観点から１４ ン、−２−イ３ｔイ
岬五でぽ−、−←上ｔセエ（−−セッ〈発明が解決しよ
うとする問題点〉
ところで従来では、上記（ａ） 、 （ｂ）の条件はわ
かってはいたが、両条件の均衡を保ち記録効率が常に良
くて使用寿命も可及的に長くなるようギャップデプスを
決めることができなかった。このため従来では、経験等
によりギャップデプスを決めていた。よって、ある種の
薄膜磁気ヘッドでは記録効率を重視するあまり使用寿命
が犠牲になり、また他の薄膜磁気ヘッドでは逆の事情が
生じる、という問題があった。(b) As the thin film magnetic head is used, it wears out from the tip of the gap due to contact with the recording medium. Therefore, from the point of view of service life, 14, -2, 3t, 5, -← upper t (-) (Problems to be solved by the invention) Conventionally, the above (a), ( Although the condition b) was known, it was not possible to determine the gap depth in such a way that both conditions were balanced, recording efficiency was always high, and the usable life was as long as possible.For this reason, in the past, based on experience, etc. Therefore, with some thin film magnetic heads, the emphasis on recording efficiency comes at the expense of service life, and with other thin film magnetic heads, the opposite occurs.
本発明は、上記実情に鑑み、まず第一に記録効率が良好
で更に使用寿命も長い薄膜磁気ヘッドを提供することを
目的とする。SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a thin film magnetic head that has good recording efficiency and a long service life.
〈問題点を解決するための手段〉
上記目的を達成する本発明の構成は、薄膜磁気ヘッドに
おいて、磁性層のギャップ形成部の傾斜に沿う延長線と
ギャップの延長線との交点を含みこの交点よりもコイル
側にギャップの先端が位置するよう構成したことを特徴
とする。<Means for Solving the Problems> The structure of the present invention that achieves the above object includes, in a thin film magnetic head, an intersection between an extension line along the slope of the gap forming portion of the magnetic layer and an extension line of the gap; The tip of the gap is located closer to the coil than the coil.
く実 施 例〉 以下、本発明の実施例を図面に基づき詳細に説明する。Example of implementation Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
第１図は本発明の実施例を示す断面図であり、第２図は
その平面図である。両図に示すように、薄膜磁気ヘッド
１は、蒸着、スパッタリング、フォトエツチング技術な
どの薄膜形成技術を用いて、磁性基板２上に、絶縁層３
、コイル４．磁性層５を形成した構造となっている。こ
のうちコイル４はスパイラル状になっている。また磁性
層５のコンタクト部５ａは磁性基板２から立ち上がって
おり、そもって傾斜している。そしてギャップ形成部５
ｂと磁性基板２との間でギャップ６が形成されている。FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a plan view thereof. As shown in both figures, the thin-film magnetic head 1 includes an insulating layer 3 formed on a magnetic substrate 2 using a thin film forming technique such as vapor deposition, sputtering, or photo-etching.
, coil 4. It has a structure in which a magnetic layer 5 is formed. Among these, the coil 4 has a spiral shape. Further, the contact portion 5a of the magnetic layer 5 stands up from the magnetic substrate 2 and is therefore inclined. and gap forming part 5
A gap 6 is formed between the magnetic substrate 2 and the magnetic substrate 2.
なお磁性層５の厚さｔは、どの部分でも等しくなってい
る。Note that the thickness t of the magnetic layer 5 is the same in all parts.
この実施例では、磁性層Ｓの基端Ａは、コンタクト部５
ａの傾斜ａａ’の延長と磁性基板２の表面との交点に位
置している。基端Ａの位置がこの位置からコイル４側に
寄ると磁気抵抗が増し磁気特性が低下し、また二点鎖線
で示すようにコイル４から離れるとその分だけコイル４
が大きく回るようにしなければならず形状が大きくなる
。したがって基端Ａは図示の位置が最適である。In this embodiment, the base end A of the magnetic layer S is connected to the contact portion 5.
It is located at the intersection of the extension of the slope aa' of a and the surface of the magnetic substrate 2. As the position of the proximal end A approaches the coil 4 side from this position, the magnetic resistance increases and the magnetic properties decrease, and as it moves away from the coil 4 as shown by the two-dot chain line, the coil 4
must be rotated widely, resulting in a large shape. Therefore, the optimal position for the proximal end A is as shown in the figure.
またこの実施例では、ギャップ６の先端Ｂは、ギャップ
形成部５ｂの傾斜ｂｂ’の延長とギャップ線との交点に
位置している。このときギャップデプスはｄ （−８
８’）となっている。詳細なデータは後述するが、ギャ
ップデプスがｄ以下となるよう形成したときにはギャッ
プ６の先端は磁気飽和して記録効率は良いが、図中二点
鎖線で示すようにギャップデプス１！７’ｄを越えるよ
う形成したときにはギャップ６の先端は磁気飽和せず記
録効率は低い。結局、本実施例ではギャップデプスがギ
ャップデプスがｄから平になるまで使用でき使用寿命も
長い。なお、当初のギャップデプスをｄより小さくした
ときには、良好な記録効率は確保できるものの、ｄより
小さくした分だけ使用寿命が短くなる。Further, in this embodiment, the tip B of the gap 6 is located at the intersection of the extension of the slope bb' of the gap forming portion 5b and the gap line. At this time, the gap depth is d (-8
8'). Detailed data will be described later, but when the gap depth is formed to be less than d, the tip of the gap 6 is magnetically saturated and the recording efficiency is good, but as shown by the two-dot chain line in the figure, the gap depth is 1!7'd. When the gap 6 is formed so as to exceed this value, the tip of the gap 6 is not magnetically saturated and the recording efficiency is low. After all, in this embodiment, the gap depth can be used until the gap depth becomes flat from d, and the service life is long. Note that when the initial gap depth is made smaller than d, good recording efficiency can be ensured, but the service life is shortened by the amount made smaller than d.
ここで、ギャップデプスが長く、ギャップの先端位置が
、ギャップ形成部の傾斜に沿う延長線とギャップの延長
線との交点よりも先に位置する薄膜磁気ヘッドの磁化分
布を第３図〜第７図に示す。検査対象とした薄膜磁気ヘ
ッドは、磁性基板の厚さがｌｏ［μ譜］であり磁性層の
厚さが４［μ謂］となっている。この薄膜磁気ヘッドに
おいて、記録電流値ｉ（ゼロ−ピーク値）が Ｉ［ｆｆ
１Ａ］ ５［１１１Ａ］、１０［１１１Ａ］。Here, the magnetization distribution of a thin film magnetic head with a long gap depth and a tip position of the gap located beyond the intersection of an extension line along the slope of the gap forming part and an extension line of the gap is shown in FIGS. 3 to 7. As shown in the figure. In the thin-film magnetic head that was tested, the thickness of the magnetic substrate was lo [μ], and the thickness of the magnetic layer was 4 [μ]. In this thin film magnetic head, the recording current value i (zero-peak value) is I[ff
1A] 5 [111A], 10 [111A].
２０ ［ｍＡ］ 、４０ ［ｍＡ］ （７） ）ニー
ｔ！ （７Ｃｉｆｆ 化分８ ヲ、有限要素法を用いて
解析し、角ブロックでの磁束密度ＢＡを示している。20 [mA], 40 [mA] (7)) knee
T! (7Ciff Bake 8 wo, analyzed using the finite element method and shows the magnetic flux density BA in a corner block.
これら第３図〜第７図よりわかるように、ギャップデプ
スがｄより長いと、記録電流を１．１ど＾士咎／１．プ
凌、イお、プル６乏ｈ（よ乍伯珀しないことが理解され
る。したがって、磁気飽和が生じ記録効率が良好となる
のは、ギャップデプスがｄ以下であるということが判明
する。そして良好な記録効率を確保しつつ使用寿命が最
大となる条件は、ギャップデプスがｄであると決定され
る。As can be seen from these FIGS. 3 to 7, when the gap depth is longer than d, the recording current is reduced to 1.1 mm/1. It is understood that there is no difference between the magnetic field and the magnetic field. Therefore, it is clear that magnetic saturation occurs and the recording efficiency is good when the gap depth is d or less. The gap depth is determined to be d as the condition for maximizing the service life while ensuring good recording efficiency.
〈発明の効果〉
以上、実施例とともに具体的に説明したように本発明に
よれば、記録効率が良好で且つ使用寿命の長い薄膜磁気
ヘッドが実現できる。<Effects of the Invention> As described above in detail with the embodiments, according to the present invention, a thin film magnetic head with good recording efficiency and long service life can be realized.
第１図は本発明の実施例を示す断面図、第２図はその平
面図、第３図〜第７図μ磁化分布を示す解析図である。
図面中、
１は薄膜磁気ヘット、
２は磁性基板、
３は絶縁層、
４はコイル、
５は磁性層、
５ａはコンタクト部、
５ｂはギャップ形成部、
６はギャップである。FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIGS. 3 to 7 are analytical diagrams showing μ magnetization distribution. In the drawings, 1 is a thin film magnetic head, 2 is a magnetic substrate, 3 is an insulating layer, 4 is a coil, 5 is a magnetic layer, 5a is a contact portion, 5b is a gap forming portion, and 6 is a gap.
Claims (1)
イルと、このコイルを跨ぐようにコンタクト部が磁性基
板の表面から立ち上がるとともにギャップ形成部が磁性
基板の表面に向い所定角度をもって傾斜しギャップ形成
部と磁性基板との間でギャップを形成している磁性層と
、を有する薄膜磁気ヘッドにおいて、 磁性層のギャップ形成部の傾斜に沿う延長線とギャップ
の延長線との交点を含みこの交点よりもコイル側にギャ
ップの先端が位置するように構成したことを特徴とする
薄膜磁気ヘッド。[Claims] A flat magnetic substrate, a coil formed on the surface of the magnetic substrate, a contact portion rising from the surface of the magnetic substrate so as to straddle the coil, and a gap forming portion facing the surface of the magnetic substrate. In a thin film magnetic head having a magnetic layer that is inclined at a predetermined angle to form a gap between the gap forming part and the magnetic substrate, an extension line along the inclination of the gap forming part of the magnetic layer and an extension line of the gap; 1. A thin film magnetic head characterized in that the tip of the gap is located closer to the coil than the intersection point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12717386A JPS62285212A (en) | 1986-06-03 | 1986-06-03 | Thin film magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12717386A JPS62285212A (en) | 1986-06-03 | 1986-06-03 | Thin film magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62285212A true JPS62285212A (en) | 1987-12-11 |
Family
ID=14953472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12717386A Pending JPS62285212A (en) | 1986-06-03 | 1986-06-03 | Thin film magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62285212A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61110320A (en) * | 1984-11-02 | 1986-05-28 | Fujitsu Ltd | Production of thin-film magnetic head |
-
1986
- 1986-06-03 JP JP12717386A patent/JPS62285212A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61110320A (en) * | 1984-11-02 | 1986-05-28 | Fujitsu Ltd | Production of thin-film magnetic head |
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