JPS61127103A - Manufacture of magnetic head - Google Patents
Manufacture of magnetic headInfo
- Publication number
- JPS61127103A JPS61127103A JP59247739A JP24773984A JPS61127103A JP S61127103 A JPS61127103 A JP S61127103A JP 59247739 A JP59247739 A JP 59247739A JP 24773984 A JP24773984 A JP 24773984A JP S61127103 A JPS61127103 A JP S61127103A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- amorphous
- heat treatment
- magnetic field
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000000696 magnetic material Substances 0.000 claims abstract description 30
- 230000003068 static effect Effects 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 abstract description 53
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000011162 core material Substances 0.000 description 11
- 230000035699 permeability Effects 0.000 description 11
- 238000010791 quenching Methods 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15316—Amorphous metallic alloys, e.g. glassy metals based on Co
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
- 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、アモルファス磁性材を使用した磁気ヘッドの
製法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a magnetic head using an amorphous magnetic material.
、〔従来の技術〕
アモルファス磁性材を、磁気ヘッドのコア材として使用
する場合、製造されたままの状態では、一般的に透磁率
が低いため、熱処理を施してその透磁率の改善を図って
いる。この熱処理方法として、例えば、ウォーター・ク
エンチ法（Ｗ、Ｑ、法）がある（特開昭５９−１４６０
９ ）。ウォーター・クエンチ法とは、結晶化温度Ｔｘ
がキュリ一温度Ｔｃより高いアモルファス磁性材に対す
る熱処理方法であり、キュリ一温度Ｔｅよりは高いが結
晶化温度Ｔｘよりは低い温度で適当な時間保持し、その
後急冷する方法である。従来のこのような熱処理方法は
、アモルファス磁性板作製時に生じる歪などによる異方
性を充分除去して透磁率を主面内で等方的に上げ、これ
により磁気ヘッドの電磁変換特性を向上させようとする
目的及び効果を有する。, [Prior Art] When an amorphous magnetic material is used as the core material of a magnetic head, it generally has low magnetic permeability in the as-manufactured state, so heat treatment is performed to improve the magnetic permeability. There is. As this heat treatment method, for example, there is a water quench method (W, Q, method) (Japanese Patent Application Laid-Open No. 59-1460
9). The water quench method is based on the crystallization temperature Tx
is a heat treatment method for an amorphous magnetic material that is higher than the Curie temperature Tc, and is a method in which the material is held at a temperature higher than the Curie temperature Te but lower than the crystallization temperature Tx for an appropriate period of time, and then rapidly cooled. This conventional heat treatment method sufficiently removes the anisotropy caused by distortion that occurs during the production of amorphous magnetic plates, increases the magnetic permeability isotropically within the main surface, and thereby improves the electromagnetic conversion characteristics of the magnetic head. It has the purpose and effect of
従来、上述したようなウォーター・クエンチ法を施して
透磁率を向上させたアモルファス磁性材を使用して磁気
ヘッドを製造しても、加熱工程により透磁率の劣化が生
じるため、磁気ヘッドの電磁変換特性す劣化するとい５
問題点があった。また、ウォーター・クエンチ法を施す
ことができ々いアモルファス磁性材は、そのままでは磁
気特性が不足しているため、磁気ヘッドのコア材として
は利用できないという問題点もあった。Conventionally, even if a magnetic head is manufactured using an amorphous magnetic material whose permeability has been improved by applying the water quench method as described above, the permeability deteriorates due to the heating process, so electromagnetic conversion of the magnetic head is required. Characteristics deteriorate 5
There was a problem. In addition, amorphous magnetic materials that cannot be subjected to water quenching have insufficient magnetic properties and cannot be used as core materials for magnetic heads.
本発明は、・上記問題点の解決を可能とする磁気ヘッド
の製法を提供するものである。The present invention provides a method for manufacturing a magnetic head that makes it possible to solve the above problems.
本発明は、磁気ヘッドを構成するアモルファス磁性材層
をこのアモルファス磁性材層の主面に沿った一定方向の
静磁場中で熱処理することを特徴とする磁気ヘッドの製
法である。The present invention is a method for manufacturing a magnetic head, characterized in that an amorphous magnetic material layer constituting the magnetic head is heat-treated in a static magnetic field in a constant direction along the main surface of the amorphous magnetic material layer.
上記静磁場中熱処理は、磁気へツＰの製造における加熱
工程の中の最後の加熱工程時（例えばギャップスペーサ
の接着時）又はその後のブロック状態の時又は切断後の
チップ状態の時のいずれかにおいて行うことができる。The above-mentioned heat treatment in a static magnetic field is carried out either during the final heating step of the heating steps in manufacturing the magnetic sheet P (for example, when adhering a gap spacer), during the subsequent block state, or during the chip state after cutting. This can be done at
この静磁場中熱処理は、そのヘッドに有効な方向に磁界
を印加して加熱するものである。この場合、磁界の大き
さはアモルファス磁性材の反磁界に抗する大きさとし、
加熱温度Ｔは静磁場中熱処理前の加熱工程の温度をＴｏ
としたとき、Ｔ）Ｔｏとすることが必要である。This heat treatment in a static magnetic field involves heating the head by applying a magnetic field in an effective direction. In this case, the magnitude of the magnetic field should be large enough to resist the demagnetizing field of the amorphous magnetic material,
Heating temperature T is the temperature of the heating process before heat treatment in a static magnetic field.
Then, it is necessary to set T)To.
処理時間は、加熱によるアモルファス磁性材の熱劣化が
進行しない程度の長さとする。The treatment time is set to such a length that thermal deterioration of the amorphous magnetic material due to heating does not proceed.
また、この静磁場中熱処理は、磁気ヘッドの製造工程に
おける全ての加熱工程において施すこともできる。この
場合は、加熱時にアモルファス磁性材層の主面に沿った
一定方向に磁界を加えればよい。Further, this heat treatment in a static magnetic field can also be performed in all heating steps in the manufacturing process of the magnetic head. In this case, a magnetic field may be applied in a fixed direction along the main surface of the amorphous magnetic material layer during heating.
磁気ヘッドを構成するアモルファス磁性材層をその主面
に沿った一定方向の静磁場中で熱処理してヘッドコア面
内に印加磁界方向を軸とする一軸磁気異方性を積極的に
誘起させる。これにより、高周波域での透磁率に方向性
を持たせることができ、磁気ヘッドの高周波域での電磁
変換特性が向上する。これは、磁気ヘッドの高周波域に
おける電磁変換特性が、コア材であるアモルファス磁性
材層の磁気特性（透磁率）の大小だけによって決まるの
ではなく、アモルファス磁性材層には磁気ヘッドの電磁
変換特性を向上させるのに最も有効な方向が存在するた
め、本発明ではアモルファス磁性材層の主面に沿った一
定方向の静磁場中で熱処理を施して磁性材層に異方性を
つけることにより、この方向性を利用したものである。The amorphous magnetic material layer constituting the magnetic head is heat-treated in a static magnetic field oriented in a constant direction along its main surface to actively induce uniaxial magnetic anisotropy with the direction of the applied magnetic field as the axis within the head core plane. As a result, the magnetic permeability in the high frequency range can be given directionality, and the electromagnetic conversion characteristics of the magnetic head in the high frequency range are improved. This is because the electromagnetic conversion characteristics of a magnetic head in the high frequency range are determined not only by the magnitude of the magnetic properties (magnetic permeability) of the amorphous magnetic material layer that is the core material, but also because the amorphous magnetic material layer has the electromagnetic conversion characteristics of the magnetic head. Since there is a direction that is most effective for improving the magnetic material layer, in the present invention, by applying heat treatment in a static magnetic field in a fixed direction along the main surface of the amorphous magnetic material layer to impart anisotropy to the magnetic material layer, This direction is utilized.
実施例１
第１図に示すように、組成がＦｓ ４Ｃ０７０Ｓ １１
７Ｂｇのアモルファス磁性材層よりなる磁気コア（１）
を有する磁気へッドチッグ例えばビデオへッドテッグ（
２）を両磁極、即ちＮ極（３）及びＳ極（４）の間に配
して、所定磁界を印加しながら熱処理を施す。（５）は
、ガート０材である。この場合のビデオヘッドチップ（
２）の配し方は、アモルファス磁性材層による磁気コア
（１）の主面と磁界の方向（６）とが平行となるように
し、且つギャップｇのデグメ方向と磁界の方向（６）と
が平行となるようＫする。具体的な処理条件は、印加磁
界が４０００Ｇ 、加熱温度が２５０℃、処理時間が３
０分である。Example 1 As shown in FIG. 1, the composition is Fs 4C070S 11
Magnetic core (1) consisting of a 7Bg amorphous magnetic material layer
For example, a video headteg (
2) is placed between the two magnetic poles, that is, the N pole (3) and the S pole (4), and heat treatment is performed while applying a predetermined magnetic field. (5) is Girt 0 material. Video head chip in this case (
The arrangement in 2) is such that the main surface of the magnetic core (1) made of the amorphous magnetic material layer is parallel to the direction of the magnetic field (6), and the degme direction of the gap g is parallel to the direction of the magnetic field (6). K so that they are parallel. The specific processing conditions include an applied magnetic field of 4000G, a heating temperature of 250℃, and a processing time of 3.
It is 0 minutes.
第３図に本磁気ヘッドの上記熱処理前及び熱処理後にお
ける再生特性の変化を測定した結果を示す。曲線Ａが熱
処理前の再生出力、曲線Ｂが熱処理後の再生出力である
。このグラフから、１〜７ＭＨｚの範囲において、上記
静磁場中熱処理を施すことＫより磁気ヘッドの再生出力
が向上したことがわかる。FIG. 3 shows the results of measuring changes in the reproducing characteristics of the present magnetic head before and after the heat treatment. Curve A is the reproduction output before heat treatment, and curve B is the reproduction output after heat treatment. From this graph, it can be seen that in the range of 1 to 7 MHz, the reproduction output of the magnetic head was improved by applying the heat treatment in the static magnetic field.
また、第４図に本磁気ヘッドの上記熱処理前及び熱処理
後におけるインダクタンスの変化を測定した結果を示す
。曲線Ｃが熱処理前のインダクタンス、曲線りが熱処理
後のインダクタンスである。Further, FIG. 4 shows the results of measuring the change in inductance of the present magnetic head before and after the heat treatment. The curve C is the inductance before heat treatment, and the curved line is the inductance after heat treatment.
このグラフから、上記静磁場中熱処理を施すことによす
磁気ヘッドのインダクタンスが向上し、従って実効的な
透磁率も向上することがわかる。From this graph, it can be seen that the inductance of the magnetic head is improved by performing the heat treatment in the static magnetic field, and therefore the effective magnetic permeability is also improved.
なお、この実施例において使用したＦ＠４ＣＯ７０Ｓ１
１７Ｂｇのアモルファス磁性材は、Ｔｃ＜Ｔｘであるた
め、クォーター・クエンチ法を施すことができる材料で
あり、従来から磁気ヘッドのコア材として使用されてい
るものである。クォーター・クエンチを施した場合、第
５図に示すヒステリシス曲線（曲線Ｊ）が得られる。In addition, F@4CO70S1 used in this example
Since Tc<Tx, the 17Bg amorphous magnetic material is a material to which the quarter quench method can be applied, and has been conventionally used as a core material of magnetic heads. When quarter quenching is applied, a hysteresis curve (curve J) shown in FIG. 5 is obtained.
実施例２
第２図に示すように、組成がＦｓ４Ｃｏ７２Ｓｌ １３
Ｂ９のアモルファス磁性材層よりなる磁気コア（１）を
有する磁気ヘッドチップ例えばビデオヘッドチップ（２
）をＮ毬（３）及びＳ極（４）間に配して、所定磁界を
印加しながら熱処理を施す。この場合のビデオヘッドチ
ップ（２）の配し方は、アモルファス磁性材層による磁
気コア（１）の主面と磁界の方向（６）とが平行となる
ようにし、且つトラック方向と磁界の方向（６）とが平
行となるようにする。具体的な処理条件は、印加磁界が
４０００Ｇ 、加熱温度が２５０℃、処理時間が・３０
分である。Example 2 As shown in Figure 2, the composition was Fs4Co72Sl 13
A magnetic head chip, for example, a video head chip (2) having a magnetic core (1) made of a B9 amorphous magnetic material layer.
) is placed between the north pole (3) and the south pole (4), and heat treatment is performed while applying a predetermined magnetic field. In this case, the video head chip (2) is arranged so that the main surface of the magnetic core (1) made of an amorphous magnetic material layer is parallel to the direction of the magnetic field (6), and the track direction and the direction of the magnetic field are parallel to each other. (6) and are parallel to each other. The specific processing conditions are: applied magnetic field of 4000G, heating temperature of 250°C, and processing time of 30°C.
It's a minute.
第６図に本磁気ヘッドの上記熱処理前及び熱処理後にお
ける再生特性の変化を測定した結果を示す。曲線Ｅが熱
処理前の再生出力、曲線Ｆが熱処理後の再生出力である
。このグラフから、１〜７ＭＨｚの範囲において、上記
静磁場中熱処理を施すことにより磁気ヘッドの再生出力
が向上したことがわかる。FIG. 6 shows the results of measuring changes in reproduction characteristics of the present magnetic head before and after the heat treatment. Curve E is the reproduction output before heat treatment, and curve F is the reproduction output after heat treatment. From this graph, it can be seen that in the range of 1 to 7 MHz, the reproduction output of the magnetic head was improved by performing the heat treatment in the static magnetic field.
第７図に７５０ｋＨｚでの記録特性の変化を測定した結
果を示す。曲縁Ｇが静磁場中熱処理前の記録レベル、曲
線Ｈが静磁場中熱処理後の記録レベルである。飽和領域
においては、両者とも同じ記録レベルとなるが、飽和し
ない領域では上記静磁場中熱処理によって透磁率μが上
がるため、記録特性も向上する。FIG. 7 shows the results of measuring changes in recording characteristics at 750 kHz. The curved edge G is the recording level before heat treatment in a static magnetic field, and the curve H is the recording level after heat treatment in a static magnetic field. In the saturated region, both have the same recording level, but in the non-saturated region, the magnetic permeability μ is increased by the heat treatment in the static magnetic field, so that the recording characteristics are also improved.
第８図にインダクタンスの変化を測定した結果を示す。Figure 8 shows the results of measuring changes in inductance.
曲線Ｋが熱処理前のインダクタンス、曲線りが熱処理後
のインダクタンスである。このグラフからも、上記静磁
場中熱処理を施すことによりインダクタンスが向上する
ことがわかる。The curve K is the inductance before heat treatment, and the curved line is the inductance after heat treatment. This graph also shows that the inductance is improved by performing the heat treatment in the static magnetic field.
なお、このＦ・４ＣＯ７□８１．３Ｂ、のアモルファス
磁性材は、Ｔｃ＞ＴＩであるためクォーター・クエンチ
を施すことができない材料であり、製造したままの状態
では第５図のようなヒステリシス曲線（曲線工）を示す
。Note that this amorphous magnetic material F・4CO7□81.3B is a material that cannot be quarter-quenched because Tc>TI, and in the as-manufactured state it has a hysteresis curve ( curved work).
第９図Ａ−Ｃに、磁気ヘッドの製造において熱劣化する
可能性のある加熱工程の例を示す。第９図人に示すよう
に、ガード材ａηのブロックとアモルファス磁性材層（
６）とを積層接着する際の加熱工程、一点鎖線Ｘで示す
部分から切断し、一方に巻線溝（至）を加工した後（第
９図Ｂ）、第９図Ｃに示すようにギャップスペーサα◆
を挾んでガラス融着する際の加熱工程等において熱劣化
が生じる。第９図Ｃの一点鎖線Ｙは、個々の磁気へラド
チップに切断する際の切断箇所である。従って、本発明
に係る静磁場中熱処理は、最後の加熱工程が終った後、
或は各加熱工程又は最後の加熱工程において施せば良い
。FIGS. 9A to 9C show examples of heating steps that may cause thermal deterioration in the manufacture of magnetic heads. As shown in Figure 9, a block of guard material aη and an amorphous magnetic material layer (
6) and the heating process when laminating and adhering the two, cut from the part indicated by the dashed line Spacer α◆
Thermal deterioration occurs during the heating process when sandwiching and fusing the glass. The dot-dash line Y in FIG. 9C is the cutting location when cutting into individual magnetic helad chips. Therefore, in the static magnetic field heat treatment according to the present invention, after the final heating step,
Alternatively, it may be applied at each heating step or at the last heating step.
従来コア材として一般に用いられている、Ｔｃ＜Ｔｘの
アモルファス磁性材より成る磁気ヘッドは、製造工程に
おける加熱処理の際、透磁率が劣化するという問題点が
あったが、本発明に係る静磁場中熱処理を施すことによ
り、透磁率の劣化が防止され、高周波域における電磁変
換特性の向上を図ることができる。また、Ｔｃ＞Ｔｘで
あり、磁気特性不足であるためコア材として用いられな
かったアモルファス材も本発明に係る靜ａ場中熱処理を
施すことＫよりｔ５Ｉｉ変換特性の向上が図れるため、
高周波用磁気ヘッドに利用することができる。Conventionally, magnetic heads made of amorphous magnetic materials with Tc<Tx, which are generally used as core materials, have had the problem that magnetic permeability deteriorates during heat treatment in the manufacturing process. By performing medium heat treatment, deterioration of magnetic permeability can be prevented and electromagnetic conversion characteristics in a high frequency range can be improved. In addition, since Tc>Tx, amorphous materials that were not used as core materials due to insufficient magnetic properties can be improved in t5Ii conversion characteristics by applying the in-situ heat treatment according to the present invention.
It can be used in high frequency magnetic heads.
第１図及び第２図は本発明に係る静磁場中熱処理方法を
示す斜視図、第３図及び第６図は実施例の磁気ヘッドと
比較例の再生出力を測定したグラフ、第４図及び第８図
は実施例の磁気ヘッドと比較例のインダクタンスを測定
したグラフ、第５図は実施例の磁束密度を測定したグラ
フ、第７図は実施例の記録レベルを測定したグラフ、第
９図Ａ〜Ｃは磁気ヘッドの製造工程において静磁場中熱
処理を施す必要のある工程を示す斜視図である。
（１）はアモルファス磁性材層、（２）はビデオへラド
チップである。
第１図 第２図
第３図
周波数〔ＭＨｚＥ
第５図
第６図
周波数［ＨＨ２］
言（ｌｅｆｔ 電 ：Ｌ＜ｍ１０１ｙｓｏｈ第８図1 and 2 are perspective views showing the heat treatment method in a static magnetic field according to the present invention, FIGS. 3 and 6 are graphs measuring the reproduction output of the magnetic head of the example and the comparative example, and FIGS. Figure 8 is a graph measuring the inductance of the magnetic head of the example and the comparative example, Figure 5 is a graph measuring the magnetic flux density of the example, Figure 7 is a graph measuring the recording level of the example, and Figure 9. A to C are perspective views showing steps that require heat treatment in a static magnetic field in the manufacturing process of a magnetic head. (1) is an amorphous magnetic material layer, and (2) is a video rad chip. Fig. 1 Fig. 2 Fig. 3 Frequency [MHzE Fig. 5 Fig. 6 Frequency [HH2] Word (left electric: L<m101ysoh Fig. 8
Claims (1)
ファス磁性材層の主面に沿つた一定方向の静磁場中で熱
処理することを特徴とする磁気ヘッドの製法。1. A method for manufacturing a magnetic head, comprising heat-treating an amorphous magnetic material layer constituting the magnetic head in a static magnetic field in a constant direction along the main surface of the amorphous magnetic material layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59247739A JPS61127103A (en) | 1984-11-22 | 1984-11-22 | Manufacture of magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59247739A JPS61127103A (en) | 1984-11-22 | 1984-11-22 | Manufacture of magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61127103A true JPS61127103A (en) | 1986-06-14 |
Family
ID=17167946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59247739A Pending JPS61127103A (en) | 1984-11-22 | 1984-11-22 | Manufacture of magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61127103A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61131213A (en) * | 1984-11-27 | 1986-06-18 | エヌ・ベー・フイリツプス・フルーイランペンフアブリケン | Magnetic head |
| JPS62276810A (en) * | 1986-02-24 | 1987-12-01 | Toshiba Corp | Manufacture of high-permeability magnetic core |
| JPH02116005A (en) * | 1988-10-25 | 1990-04-27 | Matsushita Electric Ind Co Ltd | Magnetic head |
| US4944805A (en) * | 1987-09-10 | 1990-07-31 | Fuji Photo Film Co., Ltd. | Method of heat treatment amorphous soft magnetic film layers to reduce magnetic anisotropy |
| US5503686A (en) * | 1994-03-16 | 1996-04-02 | Fuji Electric Co., Ltd. | Heat treatment method for thin film magnetic head |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53146922A (en) * | 1977-05-30 | 1978-12-21 | Hitachi Ltd | Heat treating method for amorphous metal body in magnetic field |
| JPS5441221A (en) * | 1977-09-09 | 1979-04-02 | Hitachi Ltd | Amorphous alloy and stabilizing method for magnetic characteristics theereof |
| JPS54160221A (en) * | 1978-06-08 | 1979-12-18 | Matsushita Electric Ind Co Ltd | Magnetic head and production thereof |
| JPS56163519A (en) * | 1980-05-17 | 1981-12-16 | Matsushita Electric Ind Co Ltd | Production of magnetic head |
-
1984
- 1984-11-22 JP JP59247739A patent/JPS61127103A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53146922A (en) * | 1977-05-30 | 1978-12-21 | Hitachi Ltd | Heat treating method for amorphous metal body in magnetic field |
| JPS5441221A (en) * | 1977-09-09 | 1979-04-02 | Hitachi Ltd | Amorphous alloy and stabilizing method for magnetic characteristics theereof |
| JPS54160221A (en) * | 1978-06-08 | 1979-12-18 | Matsushita Electric Ind Co Ltd | Magnetic head and production thereof |
| JPS56163519A (en) * | 1980-05-17 | 1981-12-16 | Matsushita Electric Ind Co Ltd | Production of magnetic head |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61131213A (en) * | 1984-11-27 | 1986-06-18 | エヌ・ベー・フイリツプス・フルーイランペンフアブリケン | Magnetic head |
| JPS62276810A (en) * | 1986-02-24 | 1987-12-01 | Toshiba Corp | Manufacture of high-permeability magnetic core |
| US4944805A (en) * | 1987-09-10 | 1990-07-31 | Fuji Photo Film Co., Ltd. | Method of heat treatment amorphous soft magnetic film layers to reduce magnetic anisotropy |
| JPH02116005A (en) * | 1988-10-25 | 1990-04-27 | Matsushita Electric Ind Co Ltd | Magnetic head |
| US5503686A (en) * | 1994-03-16 | 1996-04-02 | Fuji Electric Co., Ltd. | Heat treatment method for thin film magnetic head |
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