JP4653924B2 - Magnetic head for perpendicular recording and magnetic disk drive equipped with the same - Google Patents
Magnetic head for perpendicular recording and magnetic disk drive equipped with the same Download PDFInfo
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【０００１】
【発明の属する技術分野】
本発明は、垂直記録用磁気ヘッドとその作製方法及びその垂直記録用磁気ヘッドを搭載した磁気ディスク装置に関するものである。
【０００２】
【従来の技術】
磁気ディスク装置では、記録媒体上のデ−タは磁気ヘッドによって読み書きされる。磁気ディスクの単位面積当たりの記録容量を多くするためには、面記録密度を高密度化する必要がある。しかしながら、現状の面内記録方式では、記録されるビット長が小さくなると、媒体の磁化の熱揺らぎのために面記録密度があげられない問題がある。この問題の解決のために媒体に垂直な方向に磁化信号を記録する垂直記録方式がある。
垂直記録方式には、記録媒体として軟磁性の裏打層を備えた二層垂直媒体を用いる方式と、裏打層を有さない単層垂直媒体を用いる方式の２種類があるが、記録媒体として二層垂直媒体を用いる場合には、主磁極と補助磁極とを備えたいわゆる単磁極ヘッドを用いて記録を行う必要がある。また、記録密度の向上のためには、垂直記録においてもトラック密度と線記録密度を向上する必要があるが、トラック密度向上のためには、磁気ヘッドの狭トラック化が必須である。
一方、狭トラック化が進むにつれて記録電流非印加時に主磁極の残留磁化により発生する残留磁界が大きくなるという現象がある。このような現象は、例えば、46th Annual Conference on Magnetism and Magnetic Materials の講演番号ＡＢ-１０で報告されている。図２には、記録電流をオフした際に、主磁極に残留する磁化により発生する磁界（以下、残留磁界と略す）と記録トラック幅との関係を示した。残留磁界が大きくなると、残留磁界が垂直記録媒体上の記録情報を消去するという問題が生じ、高密度記録を実現する際の大きな障害となる。
特開２００１−２９１２１２号には、ヘッドの磁極形状を矩形にし、その伸張化を抑えることにより、残留磁界の発生を抑制する技術が開示されている。
【０００３】
【発明が解決しようとする課題】
特開２００１−２９１２１２号公報に記載の磁気ヘッドは、記録磁極に磁束絞り部分がないため大きな磁界強度の記録磁界が発生できない。
【０００４】
そこで、本発明は、記録磁界強度を減少させずに垂直記録媒体上の記録情報が消去するという問題が生じない垂直記録用磁気ヘッドとその垂直記録用磁気ヘッドを搭載した磁気ディスク装置を提供するものである。
【０００５】
【課題を解決するための手段】
本発明では、主磁極と補助磁極とを備えた記録ヘッドと、再生素子を備えた再生ヘッドとを有し、前記主磁極において浮上面に平行な断面積が浮上面に向かって減少する絞込み部分を有し、該絞込み部分の最も浮上面に近い位置から主磁極浮上面までの距離を、主磁極浮上面の面積で割った比が0より大きくかつ0.002[nm-1]より小さい構造とする。絞り込み部があるため、絞り込み部が無い構造の磁気ヘッドに比べてより大きな強度の記録磁界を発生できる。また、上記の比を0より大きくかつ0.002[nm-1]より小さい範囲にすることにより、残留磁化の向きがABS面と平行になるように還流するようになるため、残留磁界を抑制する事ができる。
本発明の発明者らは、主磁極先端の磁化状態をマイクロマグネティックスシミュレーションを用いて計算し、前記主磁極と補助磁極とを備えた記録ヘッドと、再生素子を備えた再生ヘッドとを有し、前記主磁極において浮上面に平行な断面積が浮上面に向かって減少する絞込み部分を有し、該絞込み部分の最も浮上面に近い位置から主磁極浮上面までの距離と、主磁極浮上面の面積の比が0より大きくかつ0.002[nm-1]より小さい構造であれば残留磁界を記録磁界強度１０％以下に低減できることを見いだした。このような主磁極形状の単磁極型ヘッドを用いることにより、残留磁界により垂直記録媒体上の記録情報が消去するという問題が生じない垂直記録用磁気ヘッドを提供できる。さらに、このような単磁極型ヘッドを搭載することにより、従来よりもトラック密度の向上した磁気ディスク装置を提供できる。
【０００６】
【発明の実施の形態】
（実施例１）
以下、図面を用いて本発明を説明する。図３は本発明を用いた磁気ディスク装置の概念の概略図である（但し、図の拡大倍率は均一では無い）。磁気ディスク装置は、磁気ディスク１１上に、サスペンションアーム１２の先端に固定されたスライダー１３に搭載された磁気ヘッド１４によって磁化信号の記録再生を行なう。図４に垂直記録用磁気ヘッドと磁気ディスクとの関係の概略図を示す（但し、図の拡大倍率は均一では無い）。図５には、垂直記録の概略図を示す。主磁極からでた磁界は記録層、裏打ち層を通り、補助磁極である上部シールド３に入る磁気回路を形成し、記録層に磁化パターンを記録する。記録層と裏打層の間には中間層が形成されている場合もある。
図６は一般的な単磁極ヘッドのトラック中心位置での記録磁界分布を示している。縦軸は記録磁界強度の最大値で規格化してある。図６より、補助磁極には主磁極で発生する記録磁界の最大値に対して１０％〜２０％程度の磁界が発生していることが分かるが、補助磁極によっては記録後消去の問題は発生していない。例えば、補助磁極のトラック幅方向の長さは主磁極よりもかなり大きいが、補助磁極から発生する残留磁界によって隣接トラックが消去されるような現象は起きていない。従って、主磁極の残留磁界強度を、補助磁極で発生する記録磁界の最小値である１０％（主磁極で発生する最大磁界に対して）以下にできれば、記録後消去は完全に防止できると考えられる。
図１は、主磁極において浮上面に平行な断面積が浮上面に向かって減少する絞込み部分の最も浮上面に近い位置から主磁極浮上面までの距離と、主磁極浮上面の面積との比と残留磁界強度の関係を示した図である。縦軸は、同じ構造のヘッドの記録磁界強度で規格化した値である。図７には主磁極において浮上面に平行な断面積が浮上面に向かって減少する絞込み部分の最も浮上面に近い位置から主磁極浮上面までの距離３３を示している。主磁極において浮上面に平行な断面積が浮上面に向かって減少する絞込み部分の最も浮上面に近い位置から主磁極浮上面までの距離と、主磁極浮上面の面積との比を0.002[nm-1]より小さい構造にすることにより、残留磁界強度を記録電流印加時に補助磁極から発生する磁界強度と同等以下の１０％程度に低減できる。これは、主磁極において浮上面に平行な断面積が浮上面に向かって減少する絞込み部分の最も浮上面に近い位置から主磁極浮上面までの距離と、主磁極浮上面の面積との比を小さくすることにより、残留磁化が磁極内で浮上面に平行に還流するためである。
図８は比が大きい場合の残留磁化状態を計算した結果であり、ディスク回転方向から見た磁化状態である。図９は比が小さい場合の残留磁化状態を計算した結果であり、残留磁化が磁極内で浮上面に平行に還流し、これにより残留磁化の垂直成分が減少する事を見出した。図９(a)はディスク回転方向から見た磁化状態、図９(ｂ)は浮上面の磁化状態である。
（実施例２）
本実施例に記載の発明は、主磁極と補助磁極とを備えた記録ヘッドと、再生素子を備えた再生ヘッドとを有し、前記主磁極において浮上面に平行な断面積が浮上面に向かって減少する絞込み部分を有し、該絞込み部分の最も浮上面に近い位置から主磁極浮上面までの距離と、主磁極記録トラック幅との比が0より大きくかつ0.33以下の構造であることを特徴とする垂直磁気記録用単磁極ヘッドである。図１０に残留磁界強度の減少を示した。縦軸は、同じ構造のヘッドの記録磁界強度で規格化した値である。
（実施例３）
本実施例に記載の発明は、主磁極と補助磁極とを備えた記録ヘッドと、再生素子を備えた再生ヘッドとを有し、前記主磁極において浮上面に平行な断面積が浮上面に向かって減少する絞込み部分を有し、該絞込み部分の最も浮上面に近い位置から主磁極浮上面までの距離と、主磁極ディスク回転方向の膜厚との比が0より大きくかつ0.33以下の構造であることを特徴とする垂直磁気記録用単磁極ヘッドである。
（実施例４）
本実施例に記載の発明は、主磁極と補助磁極を有する記録ヘッドと磁気抵抗効果型再生素子を備えた単磁極型の記録再生ヘッドを搭載した磁気ヘッドスライダであり、前記主磁極が実施例１、２、３で示した構造を有することを特徴とする磁気ヘッドスライダである。
【０００７】
本実施例の磁気ヘッドスライダの概略は図３に示されている。
（実施例５）
本実施例に記載の発明は、主磁極と補助磁極を有する記録ヘッドと磁気抵抗効果型再生素子を備えた単磁極型の記録再生ヘッドを搭載した磁気ヘッドスライダと、磁気ヘッドスライダを支持するジンバルと、ジンバルを固定するサスペンションとを備えたヘッド・アッセンブリであって、前記主磁極が実施例１、２、３で示した構造を有することを特徴とするヘッド・アッセンブリである。
【０００８】
本実施例のヘッド・アッセンブリの概略は図３に示されているサスペンションアーム１２と磁気ヘッドスライダを組み合わせたものである。図では省略しているが、ジンバルはサスペンションアーム１２の先端部に接合されている。したがって、サスペンションアームとは別の部品であるが、サスペンションアーム１２の先端部に一体形成されていることもある。
（実施例６）
本実施例に記載の発明は、二層垂直磁気記録媒体と、単磁極型記録再生ヘッドと、記録媒体を一定方向に回転駆動する駆動装置とを備えた磁気ディスク装置であって、前記主磁極が実施例１、２、３で示した構造を有することを特徴とする磁気ディスク装置である。狭トラック化において記録後消去のない磁気ディスク装置を製造することができる。
【０００９】
【発明の効果】
垂直記録用磁気ヘッドの主磁極において浮上面に平行な断面積が浮上面に向かって減少する絞込み部分を有し、該絞込み部分の最も浮上面に近い位置から主磁極浮上面までの距離と、主磁極浮上面の面積との比が0より大きくかつ0.002[nm-1]より小さい構造にすることにより、記録後の記録磁極の残留磁化により発生する残留磁界により垂直記録媒体上の記録情報が消去するという問題が生じない垂直記録用磁気ヘッドを提供でき、さらに、これを用いた磁気ディスク装置を得ることができる。
【図面の簡単な説明】
【図１】本発明による単磁極ヘッドの残留磁界の減少を示した図。
【図２】従来の単磁極ヘッドの残留磁界の増加を示した図。
【図３】本発明の実施の形態における磁気ディスク装置の概念の概略図である（但し、拡大倍率は均一ではない）。
【図４】本発明の実施の形態における垂直記録用磁気ヘッドと磁気ディスクとの関係の概略図（但し、拡大倍率は均一ではない）。
【図５】垂直記録の概略図（但し、拡大倍率は均一ではない）。
【図６】一般的な単磁極ヘッドからトラック中心位置での記録磁界分布を示した図。
【図７】本発明による単磁極ヘッドの寸法比の概略を説明した図。（但し、拡大倍率は均一ではない）
【図８】従来の単磁極ヘッドの残留磁化状態の計算結果を示した図。（但し、拡大倍率は均一ではない）
【図９】本発明による単磁極ヘッドの残留磁化状態の計算結果を示した図。（但し、拡大倍率は均一ではない）
【図１０】本発明による単磁極ヘッドの別の残留磁界の減少を示した図。
【符号の説明】
１…主磁極、２…コイル、３…補助磁極、４…主磁極膜厚、５…記録トラック幅、７…再生素子、８…下部シールド、１１…磁気ディスク、１２…サスペンションアーム、１３…磁気ヘッドスライダー、１４…磁気ヘッド、１５…ロータリーアクチュエータ、１６…記録ヘッド、１７…ディスク回転方向、１８…再生ヘッド、１９…記録層、２０…裏打ち層、２１…浮上面、２３…ディスク半径方向、２４…トレーリング側、２５…リーディング側、２７…レジスト、２８…無機絶縁膜、２９…磁性膜 、３０…空気流出端、３１…空気流入端、３２…浮上面に最も近い絞り込み部分、３３…浮上面に最も近い絞り込み部分から浮上面までの距離、３４…主磁極浮上面、３５…主磁極浮上面膜厚。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a perpendicular recording magnetic head, a method of manufacturing the perpendicular recording magnetic head, and a magnetic disk device on which the perpendicular recording magnetic head is mounted.
[0002]
[Prior art]
In a magnetic disk device, data on a recording medium is read and written by a magnetic head. In order to increase the recording capacity per unit area of the magnetic disk, it is necessary to increase the surface recording density. However, the current in-plane recording method has a problem that if the recorded bit length is small, the surface recording density cannot be increased due to thermal fluctuation of the magnetization of the medium. In order to solve this problem, there is a perpendicular recording method in which a magnetization signal is recorded in a direction perpendicular to the medium.
There are two types of perpendicular recording methods: a method using a double-layered perpendicular medium with a soft magnetic backing layer as a recording medium and a method using a single-layered perpendicular medium without a backing layer. When a layer perpendicular medium is used, it is necessary to perform recording using a so-called single magnetic pole head having a main magnetic pole and an auxiliary magnetic pole. In order to improve the recording density, it is necessary to improve the track density and the linear recording density even in the perpendicular recording. However, in order to improve the track density, it is essential to narrow the track of the magnetic head.
On the other hand, as the track becomes narrower, there is a phenomenon in which the residual magnetic field generated by the residual magnetization of the main pole increases when no recording current is applied. Such a phenomenon is reported, for example, in lecture number AB-10 of 46th Annual Conference on Magnetism and Magnetic Materials. FIG. 2 shows the relationship between the recording track width and the magnetic field generated by the magnetization remaining in the main pole when the recording current is turned off (hereinafter abbreviated as the residual magnetic field). When the residual magnetic field becomes large, there arises a problem that the residual magnetic field erases recorded information on the perpendicular recording medium, which becomes a great obstacle when realizing high-density recording.
Japanese Patent Application Laid-Open No. 2001-291212 discloses a technique for suppressing the generation of a residual magnetic field by making the magnetic pole shape of a head rectangular and suppressing the expansion.
[0003]
[Problems to be solved by the invention]
The magnetic head described in Japanese Patent Application Laid-Open No. 2001-291212 cannot generate a recording magnetic field having a large magnetic field strength because the recording magnetic pole has no magnetic flux constriction.
[0004]
Therefore, the present invention provides a perpendicular recording magnetic head that does not cause a problem of erasing recorded information on a perpendicular recording medium without reducing the recording magnetic field strength, and a magnetic disk device equipped with the perpendicular recording magnetic head. Is.
[0005]
[Means for Solving the Problems]
In the present invention, the narrowed portion having a recording head having a main magnetic pole and an auxiliary magnetic pole, and a reproducing head having a reproducing element, the cross-sectional area of the main magnetic pole being parallel to the air bearing surface decreases toward the air bearing surface. And the ratio of the distance from the position closest to the air bearing surface of the narrowed portion to the main magnetic pole air bearing surface divided by the area of the main magnetic pole air bearing surface is greater than 0 and less than 0.002 [nm −1 ] . Since there is a narrowed portion, a recording magnetic field with a greater strength can be generated compared to a magnetic head having a structure without the narrowed portion. In addition, by setting the above ratio to a range larger than 0 and smaller than 0.002 [nm-1], the residual magnetic field is recirculated so as to be parallel to the ABS surface. Can do.
The inventors of the present invention calculate the magnetization state of the tip of the main magnetic pole using a micromagnetic simulation, and have a recording head including the main magnetic pole and an auxiliary magnetic pole, and a reproducing head including a reproducing element. The main magnetic pole has a narrowing portion whose cross-sectional area parallel to the air bearing surface decreases toward the air bearing surface, the distance from the position closest to the air bearing surface to the main magnetic pole air bearing surface, and the main magnetic pole air bearing surface It has been found that the residual magnetic field can be reduced to 10% or less of the recording magnetic field if the area ratio is larger than 0 and smaller than 0.002 [nm −1 ]. By using such a single magnetic pole type head having a main magnetic pole shape, it is possible to provide a perpendicular recording magnetic head that does not cause the problem of erasing the recorded information on the perpendicular recording medium due to the residual magnetic field. Furthermore, by mounting such a single magnetic pole type head, it is possible to provide a magnetic disk device having an improved track density as compared with the prior art.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Example 1
Hereinafter, the present invention will be described with reference to the drawings. FIG. 3 is a schematic view of the concept of a magnetic disk device using the present invention (however, the magnification of the drawing is not uniform). The magnetic disk device records and reproduces a magnetization signal on a magnetic disk 11 by a magnetic head 14 mounted on a slider 13 fixed to the tip of a suspension arm 12. FIG. 4 shows a schematic diagram of the relationship between the magnetic head for perpendicular recording and the magnetic disk (however, the magnification in the figure is not uniform). FIG. 5 shows a schematic diagram of perpendicular recording. The magnetic field generated from the main magnetic pole passes through the recording layer and the backing layer, forms a magnetic circuit that enters the
FIG. 6 shows a recording magnetic field distribution at the track center position of a general single pole head. The vertical axis is normalized by the maximum value of the recording magnetic field strength. From FIG. 6, it can be seen that a magnetic field of about 10% to 20% is generated in the auxiliary magnetic pole with respect to the maximum value of the recording magnetic field generated in the main magnetic pole. Not done. For example, the length of the auxiliary magnetic pole in the track width direction is considerably larger than that of the main magnetic pole, but there is no phenomenon that the adjacent track is erased by the residual magnetic field generated from the auxiliary magnetic pole. Therefore, if the residual magnetic field strength of the main magnetic pole can be made 10% or less (relative to the maximum magnetic field generated in the main magnetic pole) which is the minimum value of the recording magnetic field generated in the auxiliary magnetic pole, it is considered that erasure after recording can be completely prevented. It is done.
FIG. 1 shows the ratio between the distance from the position closest to the air bearing surface to the main magnetic pole air bearing surface and the area of the main magnetic pole air bearing surface where the cross-sectional area parallel to the air bearing surface in the main magnetic pole decreases toward the air bearing surface. It is the figure which showed the relationship between and residual magnetic field intensity | strength. The vertical axis is a value normalized by the recording magnetic field strength of the head having the same structure. FIG. 7 shows the distance 33 from the position closest to the air bearing surface to the main magnetic pole air bearing surface, where the cross-sectional area parallel to the air bearing surface decreases toward the air bearing surface in the main magnetic pole. The ratio of the distance from the position closest to the air bearing surface to the main magnetic pole air bearing surface and the area of the main magnetic pole air bearing surface is 0.002 [nm] where the cross-sectional area parallel to the air bearing surface in the main magnetic pole decreases toward the air bearing surface. -1 ], the residual magnetic field strength can be reduced to about 10%, which is equal to or less than the magnetic field strength generated from the auxiliary magnetic pole when a recording current is applied. This is the ratio of the distance from the position closest to the air bearing surface to the main magnetic pole air bearing surface and the area of the main magnetic pole air bearing surface, where the cross-sectional area parallel to the air bearing surface in the main magnetic pole decreases toward the air bearing surface. This is because the residual magnetization recirculates in parallel with the air bearing surface in the magnetic pole.
FIG. 8 shows the result of calculation of the remanent magnetization state when the ratio is large, which is the magnetization state viewed from the disk rotation direction. FIG. 9 shows the result of calculation of the remanent magnetization state when the ratio is small. It was found that the remanent magnetization recirculates in parallel with the air bearing surface in the magnetic pole, thereby reducing the perpendicular component of the remanent magnetization. FIG. 9A shows the magnetization state viewed from the disk rotation direction, and FIG. 9B shows the magnetization state of the air bearing surface.
(Example 2)
The invention described in this example has a recording head having a main magnetic pole and an auxiliary magnetic pole, and a reproducing head having a reproducing element, and the cross-sectional area parallel to the air bearing surface of the main magnetic pole faces the air bearing surface. And the ratio of the distance from the position closest to the air bearing surface to the main magnetic pole air bearing surface and the main magnetic pole recording track width of the narrowed portion is greater than 0 and 0.33 or less. This is a single magnetic pole head for perpendicular magnetic recording. FIG. 10 shows a decrease in the residual magnetic field strength. The vertical axis is a value normalized by the recording magnetic field strength of the head having the same structure.
(Example 3)
The invention described in this example has a recording head having a main magnetic pole and an auxiliary magnetic pole, and a reproducing head having a reproducing element, and the cross-sectional area parallel to the air bearing surface of the main magnetic pole faces the air bearing surface. The ratio of the distance from the position closest to the air bearing surface to the main magnetic pole air bearing surface and the film thickness in the direction of rotation of the main magnetic pole disk is greater than 0 and 0.33 or less. There is a single magnetic pole head for perpendicular magnetic recording.
Example 4
The invention described in this embodiment is a magnetic head slider equipped with a recording head having a main magnetic pole and an auxiliary magnetic pole, and a single magnetic pole type recording / reproducing head provided with a magnetoresistive effect reproducing element. A magnetic head slider having the structure shown in FIGS.
[0007]
An outline of the magnetic head slider of this embodiment is shown in FIG.
(Example 5)
The invention described in this embodiment includes a recording head having a main magnetic pole and an auxiliary magnetic pole, a magnetic head slider equipped with a single magnetic pole type recording / reproducing head having a magnetoresistive effect reproducing element, and a gimbal for supporting the magnetic head slider. And a suspension for fixing the gimbal, wherein the main magnetic pole has the structure shown in the first, second, and third embodiments.
[0008]
The outline of the head assembly of this embodiment is a combination of the suspension arm 12 and the magnetic head slider shown in FIG. Although not shown in the figure, the gimbal is joined to the tip of the suspension arm 12. Therefore, although it is a separate part from the suspension arm, it may be integrally formed at the tip of the suspension arm 12.
(Example 6)
The invention described in the present embodiment is a magnetic disk drive comprising a double-layered perpendicular magnetic recording medium, a single-pole type recording / reproducing head, and a drive device that rotationally drives the recording medium in a fixed direction, wherein the main pole Is a magnetic disk drive having the structure shown in the first, second, and third embodiments. It is possible to manufacture a magnetic disk device with no erasure after recording in a narrow track.
[0009]
【The invention's effect】
The main magnetic pole of the perpendicular recording magnetic head has a narrowed portion in which the cross-sectional area parallel to the air bearing surface decreases toward the air bearing surface, and the distance from the position closest to the air bearing surface of the narrowed portion to the main magnetic pole air bearing surface; By using a structure in which the ratio with the area of the main magnetic pole air bearing surface is larger than 0 and smaller than 0.002 [nm -1 ], the recorded information on the perpendicular recording medium is recorded by the residual magnetic field generated by the residual magnetization of the recording magnetic pole after recording. It is possible to provide a magnetic head for perpendicular recording that does not cause the problem of erasing, and to obtain a magnetic disk device using the same.
[Brief description of the drawings]
FIG. 1 is a diagram showing a decrease in residual magnetic field of a single pole head according to the present invention.
FIG. 2 is a diagram showing an increase in residual magnetic field of a conventional single-pole head.
FIG. 3 is a schematic view of a concept of a magnetic disk device in an embodiment of the present invention (however, the enlargement magnification is not uniform).
FIG. 4 is a schematic view of the relationship between a perpendicular recording magnetic head and a magnetic disk in the embodiment of the present invention (however, the enlargement magnification is not uniform).
FIG. 5 is a schematic diagram of perpendicular recording (however, the enlargement magnification is not uniform).
FIG. 6 is a view showing a recording magnetic field distribution at a track center position from a general single-pole head.
FIG. 7 is a diagram illustrating an outline of a dimensional ratio of a single magnetic pole head according to the present invention. (However, the magnification is not uniform)
FIG. 8 is a view showing a calculation result of a residual magnetization state of a conventional single pole head. (However, the magnification is not uniform)
FIG. 9 is a diagram showing a calculation result of a remanent magnetization state of a single pole head according to the present invention. (However, the magnification is not uniform)
FIG. 10 shows another residual magnetic field reduction of a single pole head according to the present invention.
[Explanation of symbols]
DESCRIPTION OF
Claims (4)
該絞込み部分の最も浮上面に近い位置から主磁極浮上面までの距離を主磁極浮上面の面積で割った比が0より大きくかつ0.002[nm-1]より小さいことで、前記主磁極内で浮上面に対して垂直方向の残留磁化成分が減少することを特徴とする単磁極型磁気ヘッド。A recording head including a main magnetic pole and an auxiliary magnetic pole, and a reproducing head including a reproducing element, the main magnetic pole having a narrowing portion in which a cross-sectional area parallel to the air bearing surface decreases toward the air bearing surface;
The ratio obtained by dividing the distance from the position closest to the air bearing surface of the narrowed portion to the main magnetic pole air bearing surface by the area of the main magnetic pole air bearing surface is larger than 0 and smaller than 0.002 [nm-1] , A single magnetic pole type magnetic head characterized in that a residual magnetization component in a direction perpendicular to the air bearing surface is reduced .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002099528A JP4653924B2 (en) | 2002-04-02 | 2002-04-02 | Magnetic head for perpendicular recording and magnetic disk drive equipped with the same |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2002099528A JP4653924B2 (en) | 2002-04-02 | 2002-04-02 | Magnetic head for perpendicular recording and magnetic disk drive equipped with the same |
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| JP2003296906A JP2003296906A (en) | 2003-10-17 |
| JP4653924B2 true JP4653924B2 (en) | 2011-03-16 |
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| JP2002099528A Expired - Fee Related JP4653924B2 (en) | 2002-04-02 | 2002-04-02 | Magnetic head for perpendicular recording and magnetic disk drive equipped with the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7289295B2 (en) * | 2004-05-12 | 2007-10-30 | Headway Technologies, Inc. | Return pole field reduction for perpendicular write head |
| JP2006012250A (en) | 2004-06-23 | 2006-01-12 | Tdk Corp | Magnetic head for perpendicular magnetic recording |
| JP4711388B2 (en) | 2004-11-10 | 2011-06-29 | Ｔｄｋ株式会社 | Magnetic head for perpendicular magnetic recording, head gimbal assembly, head arm assembly, and magnetic disk drive |
| JP4007513B2 (en) | 2004-12-27 | 2007-11-14 | Ｔｄｋ株式会社 | Magnetic head for perpendicular magnetic recording, head gimbal assembly, head arm assembly, and magnetic disk drive |
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