JPH022209B2 - - Google Patents
Info
- Publication number
- JPH022209B2 JPH022209B2 JP12933682A JP12933682A JPH022209B2 JP H022209 B2 JPH022209 B2 JP H022209B2 JP 12933682 A JP12933682 A JP 12933682A JP 12933682 A JP12933682 A JP 12933682A JP H022209 B2 JPH022209 B2 JP H022209B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic permeability
- thin film
- magnetic field
- high magnetic
- 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.)
- Expired
Links
- 230000035699 permeability Effects 0.000 claims description 44
- 239000010409 thin film Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 20
- 230000005415 magnetization Effects 0.000 claims description 18
- 239000000696 magnetic material Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910002555 FeNi Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は記録媒体に垂直方向に記録・再生を行
う垂直磁化記録用ヘツ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 perpendicular magnetization recording head that performs recording and reproduction in a direction perpendicular to a recording medium.
従来例の構成とその問題点
高密度に磁化記録を行う方式として垂直磁化記
録方式が提案されている（たとえば特開昭52−
134706号公報、特開昭53−3209号公報参照）。こ
の方式は記録された磁化の反磁界が少く、高密度
に磁化記録できる特長があるが、垂直異方性を有
する記録媒体を必要とすると共に垂直方向の磁界
の強い垂直磁化記録用ヘツドを必要とする。第１
図は従来提案されている垂直磁化記録用ヘツドの
一例である。主磁極１は非磁性材料７で挾込まれ
た高透磁率薄膜２を有し、その薄膜２の先端は記
録媒体５の表面にある垂直異方性磁性膜６に近接
している。補助磁極３は書込また読出をするコイ
ル４を有し、主磁極１に対して媒体５の反対側に
ある。高透磁率薄膜２の先端により垂直異方性磁
性層６を信号に応じて磁化して磁気記録する。読
出しは逆に磁性層６の磁化で高透磁率薄膜２を磁
化して読出す。一般に垂直磁化記録用ヘツドは記
録・再生する磁極先端に強い垂直方向の磁界を必
要とするため、上記以外の構成例でも高透磁率薄
膜２を使用する。この様な高透磁率薄膜２を有す
る垂直磁化記録用ヘツドは高透磁率薄膜２に平行
に加わる外部磁界Hexによりヘツド出力が影響を
受け低下する欠点を有する。第２図の曲線Ａは上
記外部磁界Hexに対してヘツド出力（相対値）が
低下する実験結果である。曲線Ａより0.5Oe程度
の外部磁界によりヘツド出力が低下するが、この
程度の外部磁界は地磁気およびヘツド付近の磁気
記録装置部品や機器により加わる。第３図は代表
的な高透磁率薄膜である蒸着パーマロイ薄膜
（0.7μｍ厚み）の外部磁界Hexに対する透磁率の
変化の実測値である。1Oe程度の外部磁界Hexに
より透磁率が低下する。外部磁界Hexによる垂直
ヘツドの出力低下は高透磁率薄膜２の磁気飽和に
よる透磁率の低下が原因であるが、一般的に他の
高透磁率材料（センダスト、アモルフアス材料、
フエライト）などでも薄膜では弱い磁界で容易に
磁気飽和して透磁率が低下する。Conventional structure and its problems A perpendicular magnetization recording method has been proposed as a method for performing high-density magnetization recording (for example,
134706, JP-A-53-3209). This method has the advantage of having a small demagnetizing field for recorded magnetization and can record magnetization at high density, but it requires a recording medium with perpendicular anisotropy and a perpendicular magnetization recording head with a strong perpendicular magnetic field. shall be. 1st
The figure shows an example of a conventionally proposed perpendicular magnetization recording head. The main pole 1 has a high magnetic permeability thin film 2 sandwiched between non-magnetic materials 7, and the tip of the thin film 2 is close to a perpendicularly anisotropic magnetic film 6 on the surface of a recording medium 5. The auxiliary pole 3 has a coil 4 for writing and reading and is on the opposite side of the medium 5 to the main pole 1. The perpendicular anisotropic magnetic layer 6 is magnetized by the tip of the high magnetic permeability thin film 2 according to a signal to perform magnetic recording. Conversely, reading is performed by magnetizing the high permeability thin film 2 with the magnetization of the magnetic layer 6. Generally, a perpendicular magnetization recording head requires a strong perpendicular magnetic field at the tip of the magnetic pole for recording and reproducing, so the high magnetic permeability thin film 2 is used in configurations other than those described above. A perpendicular magnetization recording head having such a high magnetic permeability thin film 2 has a drawback that the head output is affected by the external magnetic field Hex applied in parallel to the high magnetic permeability thin film 2 and is reduced. Curve A in FIG. 2 is an experimental result in which the head output (relative value) decreases with respect to the external magnetic field Hex. According to curve A, the head output decreases due to an external magnetic field of about 0.5 Oe, but this external magnetic field is applied by the earth's magnetism and magnetic recording device parts and equipment near the head. FIG. 3 shows actual measured values of the change in magnetic permeability of a vapor-deposited permalloy thin film (0.7 μm thick), which is a typical high magnetic permeability thin film, in response to an external magnetic field Hex. Magnetic permeability decreases due to external magnetic field Hex of about 1 Oe. The decrease in the output of the vertical head due to the external magnetic field Hex is caused by the decrease in magnetic permeability due to magnetic saturation of the high magnetic permeability thin film 2, but generally other high magnetic permeability materials (sendust, amorphous material,
A thin film such as ferrite (ferrite) is easily magnetically saturated in a weak magnetic field and its permeability decreases.
以上述べた様に従来の高透磁率薄膜２を有する
垂直磁化記録用ヘツドは弱い外部磁界Hexにより
出力が大幅に低下する欠点があつた。 As described above, the conventional perpendicular magnetization recording head having the high magnetic permeability thin film 2 has the disadvantage that the output is significantly reduced by a weak external magnetic field Hex.
発明の目的
本発明はこの問題点を解決するため外部磁界
Hexの影響を少なくし、外乱ノイズ磁界の影響を
少なくした構成の垂直磁化記録用ヘツドを提供す
ることを目的とする。Purpose of the Invention The present invention aims to solve this problem by applying an external magnetic field.
It is an object of the present invention to provide a perpendicular magnetization recording head having a configuration that reduces the influence of Hex and the influence of a disturbance noise magnetic field.
発明の構成
本発明は、高透磁率薄膜を非磁性材料で取り囲
んだ構造の主磁極を有し、前記主磁極の少なくと
も一辺に接触または近接して高透磁率材料を設け
ることにより外部磁界の影響を少なくしたもので
ある。Structure of the Invention The present invention has a main magnetic pole having a structure in which a high magnetic permeability thin film is surrounded by a non-magnetic material, and the high magnetic permeability material is provided in contact with or in the vicinity of at least one side of the main magnetic pole, so that the influence of an external magnetic field can be reduced. It is a reduction of .
実施例の説明
第４図は本発明の一実施例で従来例の第１図と
同一部分には同一番号を付けて示した。高透磁率
薄膜２を非磁性材料７で挾込んだ主磁極１の回り
を高透磁率材料８で包む構成により外部磁界Hex
の影響を少くしている。この場合高透磁率材料８
は例えば、フエライト、FeNi系合金、CoZr系ア
モルフアス合金など透磁率の高い材料が良く、ま
た非磁性材料７はネオセラムなどガラス、アルミ
ナ及びその他の無機セラミツクなどが好ましい。
第５図の曲線Ｂは本発明の構成による外部磁界
Hexに対してのヘツド出力を示す。図には比較の
ため第２図に示した従来例の曲線Ａも示すが、従
来例の曲線Ａに比較して６倍以上の外部磁界によ
つてもヘツド出力が低下しない。これは第４図
で、高透磁率薄膜２よりも周囲の高透磁率材料８
の磁気抵抗が小さいため、外部磁界Hexによる磁
力線が大部分高透磁率材料８を通り、高透磁率薄
膜２を通過しない。このために外部磁界Hexによ
る透磁率の低下が少く、ヘツド出力も低下しな
い。本実施例において高透磁率材料８は必ずしも
主磁極１の周囲を完全に包まなくても高透磁率薄
膜２を通る上記磁力線が低下すれば良い。したが
つて高透磁率材料８は主磁極１の少なくとも一辺
に存在すれば効果を有する。DESCRIPTION OF THE EMBODIMENT FIG. 4 shows an embodiment of the present invention, in which the same parts as in FIG. 1 of the conventional example are given the same numbers. External magnetic field Hex
The impact of In this case high permeability material 8
For example, a material with high magnetic permeability such as ferrite, FeNi-based alloy, or CoZr-based amorphous alloy is preferable, and the non-magnetic material 7 is preferably glass such as Neoceram, alumina, or other inorganic ceramics.
Curve B in FIG. 5 shows the external magnetic field according to the configuration of the present invention.
Shows head output for Hex. The figure also shows curve A of the conventional example shown in FIG. 2 for comparison, and compared to curve A of the conventional example, the head output does not decrease even with an external magnetic field six times or more stronger. This is shown in Figure 4, where the surrounding high magnetic permeability material 8 is higher than the high magnetic permeability thin film 2.
Since the magnetic resistance is small, most of the magnetic lines of force due to the external magnetic field Hex pass through the high magnetic permeability material 8 and do not pass through the high magnetic permeability thin film 2. For this reason, the decrease in magnetic permeability due to the external magnetic field Hex is small, and the head output does not decrease. In this embodiment, the high magnetic permeability material 8 does not necessarily need to completely surround the main magnetic pole 1 as long as the above-mentioned lines of magnetic force passing through the high magnetic permeability thin film 2 are reduced. Therefore, if the high magnetic permeability material 8 is present on at least one side of the main pole 1, it will have an effect.
また高透磁率材料８は図のように主磁極１に接
触して設ける必要はなく、主磁極１の近傍に設け
ても良い。 Further, the high magnetic permeability material 8 does not need to be provided in contact with the main magnetic pole 1 as shown in the figure, but may be provided near the main magnetic pole 1.
さらに高透磁率薄膜２と高透磁率材料８は高透
磁率な材料で磁気的に直接に接続しない方が外部
磁界の磁力線が高透磁率薄膜２を通る量が少く、
磁気シールド効果が大きい。第６図は他の実施例
で、第４図の実施例と同一部分は同じ番号を付け
て示した。本実施例は、主磁極励磁型ヘツドの例
で高透磁率薄膜２を非磁性材料７で挾込んだ主磁
極１の先端の溝９にコイル４を巻いて電気信号を
入力または出力する主磁極１を有する。上記主磁
極１の周囲は高透磁率材料８により、包み前述の
実施例と同様に外部磁界Hexによる磁束が高透磁
率材料８を大部分通り、高透磁率薄膜２を通過し
ないため、外部磁界Hexの影響を少くしている。
本実施例においてはコイルが高透磁率材料８で包
まれるため、外部磁界Hexの影響が少いだけでな
く、外部からのノイズの原因となる外乱ノイズ磁
界に対してもそのノイズ磁界による外乱磁束が高
透磁率材料８を通り、コイル中を通らないためノ
イズが減少する。 Furthermore, if the high magnetic permeability thin film 2 and the high magnetic permeability material 8 are made of high magnetic permeability materials and are not directly connected magnetically, the amount of magnetic force lines of the external magnetic field passing through the high magnetic permeability thin film 2 will be smaller.
Great magnetic shielding effect. FIG. 6 shows another embodiment, in which the same parts as in the embodiment of FIG. 4 are designated by the same numbers. This embodiment is an example of a main magnetic pole excitation type head, in which a coil 4 is wound around a groove 9 at the tip of a main magnetic pole 1 in which a high magnetic permeability thin film 2 is sandwiched between non-magnetic materials 7, and an electric signal is input or output from the main magnetic pole. 1. The main magnetic pole 1 is surrounded by a high magnetic permeability material 8, and as in the previous embodiment, most of the magnetic flux due to the external magnetic field Hex passes through the high magnetic permeability material 8 and does not pass through the high magnetic permeability thin film 2, so that the external magnetic field Reduces the influence of Hex.
In this embodiment, since the coil is wrapped with the high magnetic permeability material 8, not only is the influence of the external magnetic field Hex small, but also the disturbance magnetic flux due to the noise magnetic field is suppressed against the disturbance noise magnetic field that causes external noise. passes through the high magnetic permeability material 8 and does not pass through the coil, reducing noise.
発明の効果
以上のように本発明は、高透磁率薄膜を非磁性
材料で挾み込んだ構造の主磁極の少なくとも一辺
に接触または近接して、高透磁率材料を設けた垂
直磁化記録用ヘツドであり、外部磁界Hexによる
影響を少なくするとともに、外乱ノイズ磁界の影
響を少なくする利点を有する。Effects of the Invention As described above, the present invention provides a perpendicular magnetization recording head in which a high magnetic permeability material is provided in contact with or in close proximity to at least one side of a main pole having a structure in which a high magnetic permeability thin film is sandwiched between nonmagnetic materials. This has the advantage of reducing the influence of the external magnetic field Hex as well as the influence of the disturbance noise magnetic field.
第１図は従来の垂直磁化記録用ヘツドの概略構
成図、第２図は第１図に示すヘツドに対する外部
磁界Hexに対するヘツド出力を示す図、第３図は
外部磁界Hexに対する高透磁率薄膜の透磁率の変
化を示す図、第４図は本発明の一実施例である補
助磁極励磁型の垂直磁化記録用ヘツドの概略構成
図、第５図は第４図に示すヘツドに対する外部磁
界Hexに対するヘツド出力を示す図、第６図は本
発明の他の実施例である主磁極励磁型垂直磁化記
録用ヘツドの構成図である。
１……主磁極、２……高透磁率薄膜、３……補
助磁極、４……コイル、５……記録媒体、６……
垂直異方性磁性層、７……非磁性材料、８……高
透磁率材料、９……溝。
Figure 1 is a schematic configuration diagram of a conventional perpendicular magnetization recording head, Figure 2 is a diagram showing the head output in response to an external magnetic field Hex for the head shown in Figure 1, and Figure 3 is a diagram showing the head output of the head shown in Figure 1 in response to an external magnetic field Hex. FIG. 4 is a schematic diagram of an auxiliary magnetic pole excitation type perpendicular magnetization recording head according to an embodiment of the present invention, and FIG. 5 shows changes in magnetic permeability for the head shown in FIG. FIG. 6 is a diagram showing the head output, and is a block diagram of a main pole excitation type perpendicular magnetization recording head which is another embodiment of the present invention. 1... Main magnetic pole, 2... High magnetic permeability thin film, 3... Auxiliary magnetic pole, 4... Coil, 5... Recording medium, 6...
Perpendicular anisotropic magnetic layer, 7... non-magnetic material, 8... high magnetic permeability material, 9... groove.
Claims (1)
の主磁極を有し、前記主磁極の少なくとも一辺に
接触または近接して、高透磁率材料を設けたこと
を特徴とする垂直磁化記録用ヘツド。 ２ 主磁極のまわりに、電気信号を入出力するコ
イルを設けたことを特徴とする特許請求の範囲第
１項記載の垂直磁化記録用ヘツド。[Claims] 1. A main magnetic pole having a structure in which a high magnetic permeability thin film is sandwiched between non-magnetic materials, and a high magnetic permeability material is provided in contact with or near at least one side of the main magnetic pole. Features of perpendicular magnetization recording head. 2. The perpendicular magnetization recording head according to claim 1, further comprising a coil for inputting and outputting electric signals around the main magnetic pole.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57129336A JPS5919213A (en) | 1982-07-23 | 1982-07-23 | Vertically magnetized recording head |
| US06/409,895 US4745509A (en) | 1981-08-21 | 1982-08-20 | Magnetic head with improved supporter for perpendicular magnetization recording |
| DE3231286A DE3231286C2 (en) | 1981-08-21 | 1982-08-23 | Magnetic head for deep or vertical magnetization |
| US07/127,538 US4796134A (en) | 1981-08-21 | 1987-11-30 | Magnetic head with improved supporter for perpendicular magnetization recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57129336A JPS5919213A (en) | 1982-07-23 | 1982-07-23 | Vertically magnetized recording head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5919213A JPS5919213A (en) | 1984-01-31 |
| JPH022209B2 true JPH022209B2 (en) | 1990-01-17 |
Family
ID=15007083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57129336A Granted JPS5919213A (en) | 1981-08-21 | 1982-07-23 | Vertically magnetized recording head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5919213A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0483904U (en) * | 1990-11-30 | 1992-07-21 | ||
| JPH0823612A (en) * | 1994-07-05 | 1996-01-23 | Masaru Kogyo Kk | Underfloor wiring tool |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3586827T2 (en) * | 1984-12-03 | 1993-03-25 | Olympus Optical Co | Vertical magnet head. |
-
1982
- 1982-07-23 JP JP57129336A patent/JPS5919213A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0483904U (en) * | 1990-11-30 | 1992-07-21 | ||
| JPH0823612A (en) * | 1994-07-05 | 1996-01-23 | Masaru Kogyo Kk | Underfloor wiring tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5919213A (en) | 1984-01-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4646184A (en) | Magnetic head for recording and reproduction | |
| US4639810A (en) | Magnetic head for perpendicular magnetization | |
| JPH022209B2 (en) | ||
| JPH022207B2 (en) | ||
| JPS6341125B2 (en) | ||
| JPH0327963B2 (en) | ||
| JP2701748B2 (en) | Magnetoresistive element and bias applying method thereof | |
| JPS6394413A (en) | Shield for magnetic field induction transducer | |
| JPH08203032A (en) | Magnetoresistive effect reproducing head | |
| JPH0426907A (en) | Magneto-resistance effect type head | |
| JPS5936330B2 (en) | magnetic head | |
| JP2658868B2 (en) | Magnetoresistive element and reproducing method thereof | |
| JPS61196418A (en) | thin film magnetic head | |
| JP2658872B2 (en) | Magnetoresistance effect element | |
| JPH05266437A (en) | Magnetoresistive head | |
| JPH0444803B2 (en) | ||
| JPH0320803B2 (en) | ||
| JPS60113317A (en) | Composite type vertical magnetic recording medium | |
| JPH02198011A (en) | Magnetic head | |
| JPH0897487A (en) | Magnetoresistance effect device and its reproducing method | |
| JPH0490101A (en) | perpendicular magnetic recording device | |
| JPS58102321A (en) | magnetic head | |
| JPS60133517A (en) | Magnetoresistive head | |
| JPS58125216A (en) | Perpendicular magnetization recording head | |
| JPS63108521A (en) | Magneto-resistance effect type thin film head |