JPS59231720A - Thin film vertical recording head - Google Patents
Thin film vertical recording headInfo
- Publication number
- JPS59231720A JPS59231720A JP10519483A JP10519483A JPS59231720A JP S59231720 A JPS59231720 A JP S59231720A JP 10519483 A JP10519483 A JP 10519483A JP 10519483 A JP10519483 A JP 10519483A JP S59231720 A JPS59231720 A JP S59231720A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- thin film
- bias
- recording
- magnetic pole
- 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
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
-
- 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
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/027—Analogue recording
- G11B5/03—Biasing
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は薄膜プロセスにより製造される薄膜垂直記録
ヘッドに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a thin film perpendicular recording head manufactured by a thin film process.
従来例の構成とその問題点
従来提案されている垂直記録ヘッドとしては、補助磁極
励磁型と、主磁極励磁型とがある。補助磁極励磁型は、
マルチトラック構成にした場合、クロストークが大きく
実用には無理がある。一方、主磁極励磁型ヘッドを高密
度マルチトラック構成にするためには薄膜ヘッドによる
ことが不可欠である。この場合の薄膜垂直記録ヘッドの
構成例を第１図に示す。これは１つのトラックの断面図
である。図において、１はフェライト基板、２はその上
に構成されたＡ／薄膜等による渦巻状の薄膜コイル、３
はさらにその上に絶縁物を介して構成されたパーマロイ
薄膜からなる主磁極である。主磁極３の先端部４は磁束
集中のため２〜３μｍ以下に構成される。５はフェライ
ト基板１上に設けられた溝の中に充填された非磁性材で
ある。６はベースフィルム、７はパーマロイ薄ｍ 、
８ ハＣｏ−Ｃｒ垂直磁化膜であシ、６〜８は垂直記録
媒体を構成している。Conventional Structures and Problems There are two types of perpendicular recording heads that have been proposed in the past: an auxiliary pole excitation type and a main pole excitation type. The auxiliary magnetic pole excitation type is
When using a multi-track configuration, crosstalk is large and it is not practical. On the other hand, in order to form a main pole excitation type head into a high-density multi-track configuration, it is essential to use a thin film head. An example of the configuration of a thin film perpendicular recording head in this case is shown in FIG. This is a cross-sectional view of one track. In the figure, 1 is a ferrite substrate, 2 is a spiral thin film coil made of A/thin film, etc. formed on it, and 3 is a ferrite substrate.
is a main magnetic pole made of a permalloy thin film which is further formed with an insulator interposed thereon. The tip portion 4 of the main magnetic pole 3 is configured to have a thickness of 2 to 3 μm or less for magnetic flux concentration. 5 is a nonmagnetic material filled in a groove provided on the ferrite substrate 1. 6 is base film, 7 is permalloy thin m,
8 C is a Co--Cr perpendicular magnetization film, and 6 to 8 constitute a perpendicular recording medium.
以下に、この薄膜垂直記録ヘッドの動作を説明する。記
録すべき信号に対応した信号電流が薄膜コイル２に流さ
れる。この薄膜コイル２を流れる電流によって生じた起
磁力は磁束を発生させるが、この磁束は主磁極３−＋Ｃ
ｏ−Ｃｒ垂直磁化膜８−＋パーマロイ薄膜７−＋Ｃｏ−
Ｃｒ垂直磁化膜８−１−フェライト基板１−＋主磁極３
の閉磁路を通る。この時、垂直記録媒体中では矢印９の
ように磁束が流れる。主磁極３の先端部４の直下のＣｏ
−Ｃｒ垂直磁化膜８中では磁束の集中があシ、この部分
で記録が行なわれる。この場合、Ｃｏ−Ｃｒ垂直磁化膜
８を飽和させることのできる大きさの起磁力を加える必
要がある。薄膜ヘッドの欠点の一つに高起磁力を得るこ
とがむずかしいということがある。高起磁力を得るため
には、薄膜コイル２の巻数を多くするか印加電流を大き
くすることが必要である。しかし、高集積度を得るため
には巻数を少なく、コイル導体の厚さを薄くする必要が
あるため、電流容素も小さくなる。したがって、薄膜垂
直記録ヘッドによシ、飽和磁化の高いＣｏ−Ｃｒ垂直磁
化膜に記録することは困難である。The operation of this thin film perpendicular recording head will be explained below. A signal current corresponding to the signal to be recorded is passed through the thin film coil 2. The magnetomotive force generated by the current flowing through this thin film coil 2 generates magnetic flux, and this magnetic flux is
o-Cr perpendicular magnetization film 8-+permalloy thin film 7-+Co-
Cr perpendicular magnetization film 8-1-ferrite substrate 1-+main magnetic pole 3
passes through a closed magnetic path. At this time, magnetic flux flows as shown by arrow 9 in the perpendicular recording medium. Co directly below the tip 4 of the main pole 3
Magnetic flux is concentrated in the -Cr perpendicularly magnetized film 8, and recording is performed in this portion. In this case, it is necessary to apply a magnetomotive force large enough to saturate the Co--Cr perpendicularly magnetized film 8. One of the drawbacks of thin film heads is that it is difficult to obtain a high magnetomotive force. In order to obtain a high magnetomotive force, it is necessary to increase the number of turns of the thin film coil 2 or to increase the applied current. However, in order to obtain a high degree of integration, it is necessary to reduce the number of turns and the thickness of the coil conductor, which also reduces the current carrying capacity. Therefore, it is difficult to record on a Co--Cr perpendicular magnetization film with high saturation magnetization using a thin film perpendicular recording head.
発明の目的
この発明は、低起磁力で高飽和磁化の二層膜媒体に記録
できる薄膜垂直記録ヘッドを提供することを目的とする
。OBJECTS OF THE INVENTION An object of the present invention is to provide a thin film perpendicular recording head capable of recording on a dual-layer film medium with low magnetomotive force and high saturation magnetization.
発明の構成
この発明の薄膜垂直記録ヘッドは、強磁性薄膜からなシ
先端が記録媒体と対向する主磁極と、この主磁極上鎖交
し前記主磁極より記録磁界を発生させる渦巻状薄膜コイ
ルと、記録信号に影響を与えないような十分高い周波数
の交流バイアス磁界を発生して前記主磁極を磁化する交
流バイアス磁界発生手段とを備える構成である。Structure of the Invention The thin film perpendicular recording head of the present invention comprises a main magnetic pole made of a ferromagnetic thin film whose tip faces the recording medium, and a spiral thin film coil interlinked with the main magnetic pole to generate a recording magnetic field from the main magnetic pole. and AC bias magnetic field generating means for magnetizing the main magnetic pole by generating an AC bias magnetic field of a sufficiently high frequency that does not affect the recording signal.
この発明によれば、渦巻状薄膜コイノ１に流す記録電流
による記録磁界に交流バイアス磁界（ＡＣバイアス磁界
）を重畳した磁界が媒体に加わるため、従来の渦巻状薄
膜コイル単独の構成に比べ渦巻状薄膜コイルに流す電流
はより小さい値でも同じ記録磁界が得られる。さらに、
ＡＣバイアス周波数は信号周波数に比べ充分高いため、
再生信号にはＡＣバイアス周波数の影響はなｈ０実施例
の説明
この発明の第１の実施例を第２図に基づいて説明する。According to this invention, since a magnetic field obtained by superimposing an alternating current bias magnetic field (AC bias magnetic field) on a recording magnetic field caused by a recording current flowing through the spiral thin film coil 1 is applied to the medium, the spiral The same recording magnetic field can be obtained even if the current flowing through the thin film coil is smaller. moreover,
Since the AC bias frequency is sufficiently high compared to the signal frequency,
The reproduced signal is not affected by the AC bias frequency.h0 Description of Embodiment A first embodiment of the present invention will be described with reference to FIG.
第２図において、符号１〜９を付したものは第１図と同
様である。１０はフェライトなどの強磁性体からなる補
助磁極で巻Ｉ４１１が巻回されている。１２は記録すべ
き信号の最高周波数の数倍以上の周波数の正弦波または
矩形波の電流を印加するＡＣバイアス発生源である。こ
の動作を第３図を用いて説明する。これは垂直記録媒体
の垂直方向のＭ−Ｈループを示している。薄膜垂直記録
ヘッドのコイル巻数と許容電流で決まる最大起磁力をＨ
Ａとすると、第１図に示す薄膜垂直記録ヘッドでは垂直
記録媒体に記録される残留磁化としてＭＡ、−ＭＡＬか
得られない。この場合の起磁力による磁界の変化をＡで
示し、その時の゛Ｍ−ＨマイナーループをＬＡで示す。In FIG. 2, the parts numbered 1 to 9 are the same as those in FIG. 1. Reference numeral 10 denotes an auxiliary magnetic pole made of a ferromagnetic material such as ferrite, around which a winding I411 is wound. Reference numeral 12 denotes an AC bias generation source that applies a sine wave or rectangular wave current having a frequency several times higher than the highest frequency of the signal to be recorded. This operation will be explained using FIG. 3. This shows the vertical M-H loop of a perpendicular recording medium. The maximum magnetomotive force determined by the number of coil turns and allowable current of a thin-film perpendicular recording head is H.
If A, the thin film perpendicular recording head shown in FIG. 1 cannot obtain only MA and -MAL as residual magnetization recorded on the perpendicular recording medium. The change in the magnetic field due to the magnetomotive force in this case is indicated by A, and the MH minor loop at that time is indicated by LA.
これに対し、Ｂで示す磁界は第２図の構成の薄膜垂直記
録ヘッドによるものである。これは薄膜コイル２による
起磁力から発生した磁界Ａ（第２図９）と、補助磁極１
０に巻回されたコイル１１による起磁力から発生したバ
イアス磁界（第２図１３）との合成磁界である。この場
合、Ｃｏ−Ｃｒ垂直磁化膜８はＢのピークでは飽和磁化
まで磁化される。このため、振幅Ｓによシ磁界が細かく
変化してもそれに伴なってメジャ゛−ループ上をＭＢま
で低下し点線Ｘ上を再び上昇するというマイナーループ
をたどることになる。したがって、主磁極先端厚みの方
がＡＣバイアスの１周期の間にＣｏ−Ｃｒ垂直磁化膜８
が移動する距離よりも大きければ、１ビツトの幅の中で
残留磁化はＭｒからＭｒ′までの範囲で分布する。ここ
で、Ｍｒ′はマイナールーズＸ上の点から磁界がゼロに
なった場合の残留磁化の最小値である。この結果から明
らかなように、従来例である第１図の構成で得られる媒
体上の残留磁化は町であシ、この発明の一実施例である
第２図の構成で得られる媒体上の残留磁化はＭｒまたは
Ｍｒ′である。これに伴なってそれぞれの再生出力もこ
れらに比例するため、この発明によれば従来の薄膜垂直
記録ヘッドによシ記録した場合に比べ、より大きな再生
出力が得られる。あるいは媒体の飽和磁化が比較的小さ
く第１図の構成で飽和記録できる場合でも、この発明の
構成によれば薄膜コイル２に流す記録電流をより小さく
できる。あるいは薄膜コイル２に流す電流は同じでもパ
ーマロイ薄膜７のよシ薄い（すなわち記録効率の悪い）
二層膜媒体に記録することができるようになる。On the other hand, the magnetic field indicated by B is due to the thin film perpendicular recording head having the configuration shown in FIG. This is caused by the magnetic field A (Fig. 2, 9) generated from the magnetomotive force by the thin film coil 2 and the auxiliary magnetic pole 1.
This is a composite magnetic field with the bias magnetic field (FIG. 2, 13) generated from the magnetomotive force caused by the coil 11 wound around zero. In this case, the Co--Cr perpendicular magnetization film 8 is magnetized to saturation magnetization at the B peak. Therefore, even if the magnetic field varies minutely due to the amplitude S, the magnetic field follows a minor loop in which it decreases to MB on the major loop and rises again on the dotted line X. Therefore, the thickness of the tip of the main pole is larger than that of the Co-Cr perpendicularly magnetized film 8 during one cycle of AC bias.
is larger than the moving distance, the residual magnetization is distributed within the width of one bit from Mr to Mr'. Here, Mr' is the minimum value of residual magnetization when the magnetic field becomes zero from a point on the minor loose X. As is clear from these results, the residual magnetization on the medium obtained with the conventional configuration shown in FIG. The residual magnetization is Mr or Mr'. Accordingly, since each reproduction output is proportional to these, according to the present invention, a larger reproduction output can be obtained compared to the case where recording is performed using a conventional thin film perpendicular recording head. Alternatively, even if the saturation magnetization of the medium is relatively small and saturation recording is possible with the configuration shown in FIG. 1, the configuration of the present invention allows the recording current to flow through the thin film coil 2 to be smaller. Or, even though the current flowing through the thin film coil 2 is the same, it is thinner than the permalloy thin film 7 (that is, the recording efficiency is poor).
It becomes possible to record on double-layer film media.
この発明の第２の実施例を第４因に基づいて説明する。A second embodiment of the invention will be explained based on the fourth factor.
第４図において、１４はＡＣバイアス電流を流すための
導体であり、非磁性材５の中に埋め込まれている。これ
は薄膜でなく例えば銅線で構成することができるため断
面積を大きくすることが可能で許容電流も大きい。この
導体１４に前記第１の実施例と同様のバイアス磁界を発
生させるためのＡＣバイアス電流を流し、第３図と同じ
効果を得るものである。なお、図で１３＃−ｉ上記導体
電流によるバイアス磁界である。In FIG. 4, 14 is a conductor for flowing an AC bias current, and is embedded in the non-magnetic material 5. Since this can be made of, for example, a copper wire instead of a thin film, it is possible to increase the cross-sectional area and allow for a large current. An AC bias current for generating a bias magnetic field similar to that of the first embodiment is passed through this conductor 14, and the same effect as shown in FIG. 3 is obtained. In the figure, 13#-i is the bias magnetic field due to the conductor current.
なお、第３の実施例としてつぎのようなものも考えられ
る。図面は省略するが、第２図あるいは第３図において
、フェライト基板１を非磁性基板とするものである。こ
の場合、バイアス磁界がなけれＩｆ！第１．第２の実施
例よシもさらに記録は困難であシ、磁束のリターン効率
は低下するにもかかわらずバイアス磁界の効果は同様に
発揮され記録可能となる。Note that the following can also be considered as a third embodiment. Although not shown in the drawings, the ferrite substrate 1 in FIG. 2 or 3 is a nonmagnetic substrate. In this case, if there is no bias magnetic field, If! 1st. Although recording is even more difficult in the second embodiment and the return efficiency of the magnetic flux is lowered, the effect of the bias magnetic field is exerted in the same way and recording is possible.
なお、以上の実施例に共通な項目として記録すべき信号
の周波数と交流バイアス磁界の周波数の関係がある。基
本的には信号の最高周波数よりも充分大きい交流磁界の
周波数が必要であるが、通常信号の最高周波数は記録男
性の限界周波数近くに選定され、それ以上の周波数では
再生出力は急激に低下する。従ってこのようなシステム
においては最高周波数の２倍以上にすれば充分である。Note that a common item in the above embodiments is the relationship between the frequency of the signal to be recorded and the frequency of the AC bias magnetic field. Basically, the frequency of the alternating magnetic field is required to be sufficiently higher than the highest frequency of the signal, but the highest frequency of the signal is usually selected near the recording male's limit frequency, and at frequencies higher than that, the reproduction output drops rapidly. . Therefore, in such a system, it is sufficient to set the frequency to at least twice the highest frequency.
第１の実施例による垂直二層テープ媒体への記録特性例
を第５図に示す。図で横軸は薄膜コイル（３ターン）２
に流れる電流値を示し、縦軸は再生出力を示す。曲ｍＵ
ｔ−１１１Ｅ１の実施例で補助磁極（フェライト）１０
に５０ターンの巻線１１を巻き、１００ ＫＨｚ ＋
５０ ｍＡｐｐのバイアス電流を流した場合（テー
プ速度は９ ｒｔｒｙｒ ／ ｓｅｃ ）の１０ ｋｆ
ｔｐ＋ （１，７７ＫＨｚ ）の入出力特性を示す。曲
線Ｖは補助磁極１゜の巻線１１に電流を流さない場合で
ある。この薄膜コイル２の許容電流値は２００ｍＡｐｐ
であるため、バイアスがなければ媒体を飽和できないこ
とがわかる。なお、媒体はＣｏ−Ｃｒ層０．０７μｍ、
バーマロ（／ｆｉ Ｏ，０７μｍの垂直二層膜である。FIG. 5 shows an example of recording characteristics on a vertical double layer tape medium according to the first embodiment. In the figure, the horizontal axis is the thin film coil (3 turns) 2
The vertical axis shows the reproduction output. Song mU
Auxiliary magnetic pole (ferrite) 10 in the example of t-111E1
Winding 11 of 50 turns is wound on the 100 KHz +
10 kf with a bias current of 50 mApp (tape speed is 9 rtryr/sec)
The input/output characteristics of tp+ (1,77KHz) are shown. Curve V is the case where no current is applied to the winding 11 of the auxiliary magnetic pole of 1°. The allowable current value of this thin film coil 2 is 200mApp.
Therefore, it can be seen that the medium cannot be saturated without bias. Note that the medium has a Co-Cr layer of 0.07 μm,
Barmaro (/fi O, 07 μm vertical double layer film.
なお、他の実施例でも同様の効果があることが確認され
た。In addition, it was confirmed that other examples had similar effects.
なお、この発明の構成は多トランクヘッドに応用する場
合もすべてのヘッドに同一の補助磁極１゜またはＡＣバ
イアス導体１４によってバイアス磁界をかければよりた
め、非常に簡単に適用できる。The configuration of the present invention can be applied very easily to a multi-trunk head, since it is sufficient to apply a bias magnetic field to all heads using the same 1° auxiliary magnetic pole or AC bias conductor 14.
発明の効果
この発明の薄膜垂直記録ヘッドによれば、従来の薄膜垂
直記録ヘッドにより記録した場合に比べ、よシ大きな再
生出力が得られる。あるいは、同じ再生出力を得る場合
にも渦巻状薄膜コイルに流す電流をよシ小さくできる。Effects of the Invention According to the thin film perpendicular recording head of the present invention, a much larger reproduction output can be obtained than when recording with a conventional thin film perpendicular recording head. Alternatively, even when obtaining the same reproduction output, the current flowing through the spiral thin film coil can be made much smaller.
また、渦巻状薄膜コイルに流す電流を同じとすれば、高
透磁率層のよシ薄い垂直二層媒体に記録することができ
る。Furthermore, if the same current is applied to the spiral thin film coil, recording can be performed on a perpendicular two-layer medium with a thinner high magnetic permeability layer.
第１図は従来の薄膜垂直記録ヘッドの断面図、８２図は
この発明の第１の実施例の断面図、第３図はその動作説
明図、第４図はこの発明の第２の実施例の断面図、第５
図は記録特性を示す特性図である。
１・・・フェライト基板、２・・・薄膜コイル、３・・
・主磁極、５・・・非磁性層、１０・・・補助磁極、１
１・・・巻線、１２・・・ＡＣバイアス発生源
９
第１図
１
第２図
第３図
第４図
１１胤（ｍＡｐｐ）−
第５図FIG. 1 is a sectional view of a conventional thin-film perpendicular recording head, FIG. 82 is a sectional view of a first embodiment of the present invention, FIG. 3 is an explanatory diagram of its operation, and FIG. 4 is a second embodiment of the present invention. 5th cross-sectional view of
The figure is a characteristic diagram showing recording characteristics. 1... Ferrite substrate, 2... Thin film coil, 3...
・Main magnetic pole, 5... Nonmagnetic layer, 10... Auxiliary magnetic pole, 1
1...Winding, 12...AC bias source 9 Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 11 Seed (mApp) - Fig. 5
Claims (4)
磁極と、この主磁極と鎖交し前記主磁極より記録磁界を
発生させる渦巻状薄膜コイルと、記録信号に影響を与え
ないような十分高い周波数の交流バイアス磁界を発生し
て前記主磁極を磁化する交流バイアス磁界発生手段とを
備えた薄膜垂直記録ヘッド。(1) A main magnetic pole made of a ferromagnetic thin film whose tip faces the recording medium, a spiral thin film coil that interlinks with this main magnetic pole and generates a recording magnetic field from the main magnetic pole, and a spiral thin film coil that does not affect the recording signal. and AC bias magnetic field generating means for generating an AC bias magnetic field of a sufficiently high frequency to magnetize the main pole.
媒体を挾んで前記主磁極と対向するように配置した強磁
性体からなる補助磁極と、この補助磁極に巻回した巻線
と、仁の巻線に交流電流を流す交流バイアス発生源とか
ら構成されている特許請求の範囲第（１）項記載の薄膜
垂直記録ヘッド。(2) The alternating current bias magnetic field generating means includes an auxiliary magnetic pole made of a ferromagnetic material arranged to sandwich the recording medium and face the main magnetic pole, a winding wound around the auxiliary magnetic pole, and a wire winding. 2. A thin film perpendicular recording head according to claim 1, comprising an AC bias generation source that supplies an AC current to the line.
極の近傍に前記主磁極と交差するように配置された導体
と、この導体に交流電流を流す交流バイアス発生源とか
ら構成されている特許請求の範囲第（０項記載の薄膜垂
直記録へラド。(3) The current-transforming bias magnetic field generating means is comprised of a conductor disposed near the main magnetic pole so as to intersect with the main magnetic pole, and an AC bias generation source that causes an alternating current to flow through the conductor. A thin film perpendicular recording device according to claim 0.
に複数並設され、前記交流バイアス磁界発生手段は単一
であって複数の主磁極に共通に交流バイアス磁界を加え
るようＫしている特許請求の範囲第（１）項記載の薄膜
垂直記録ヘッド。(4) A plurality of pairs of the main magnetic poles and spiral thin film coils are arranged in parallel on a substrate, and the AC bias magnetic field generating means is single and is configured to commonly apply an AC bias magnetic field to the plurality of main magnetic poles. A thin film perpendicular recording head according to claim (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10519483A JPS59231720A (en) | 1983-06-13 | 1983-06-13 | Thin film vertical recording head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10519483A JPS59231720A (en) | 1983-06-13 | 1983-06-13 | Thin film vertical recording head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59231720A true JPS59231720A (en) | 1984-12-26 |
Family
ID=14400858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10519483A Pending JPS59231720A (en) | 1983-06-13 | 1983-06-13 | Thin film vertical recording head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59231720A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001022407A1 (en) * | 1999-09-20 | 2001-03-29 | Seagate Technology, Llc | Magnetic recording head including background magnetic field generator |
| US6560069B1 (en) | 1999-11-29 | 2003-05-06 | Seagate Technology, Llc | Perpendicular recording head defining the trackwidth by material deposition thickness |
| US6646827B1 (en) | 2000-01-10 | 2003-11-11 | Seagate Technology Llc | Perpendicular magnetic recording head with write pole which reduces flux antenna effect |
| US6693768B1 (en) | 2000-03-15 | 2004-02-17 | Seagate Technology Llc | Perpendicular magnetic recording head having a flux focusing main pole |
| US6717770B1 (en) | 2000-03-24 | 2004-04-06 | Seagate Technology Llc | Recording head for applying a magnetic field perpendicular to the magnetizations within magnetic storage media |
| US6798615B1 (en) | 2000-03-24 | 2004-09-28 | Seagate Technology Llc | Perpendicular recording head with return poles which reduce flux antenna effect |
| US6876519B1 (en) | 1999-09-20 | 2005-04-05 | Seagate Technology Llc | Magnetic recording head including background magnetic field generator |
| US6898053B1 (en) | 1999-10-26 | 2005-05-24 | Seagate Technology Llc | Perpendicular recording head with trackwidth defined by plating thickness |
| US6999257B2 (en) * | 2001-01-31 | 2006-02-14 | Kabushiki Kaisha Toshiba | Magnetic disk drive with structure for avoiding DC magnetic disturbance on a disk surface |
-
1983
- 1983-06-13 JP JP10519483A patent/JPS59231720A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001022407A1 (en) * | 1999-09-20 | 2001-03-29 | Seagate Technology, Llc | Magnetic recording head including background magnetic field generator |
| JP2003510739A (en) * | 1999-09-20 | 2003-03-18 | シーゲイト テクノロジー エルエルシー | Magnetic recording head with background magnetic field generator |
| US6876519B1 (en) | 1999-09-20 | 2005-04-05 | Seagate Technology Llc | Magnetic recording head including background magnetic field generator |
| JP4746232B2 (en) * | 1999-09-20 | 2011-08-10 | シーゲイト テクノロジー エルエルシー | Magnetic recording head with background magnetic field generator |
| US6898053B1 (en) | 1999-10-26 | 2005-05-24 | Seagate Technology Llc | Perpendicular recording head with trackwidth defined by plating thickness |
| US6560069B1 (en) | 1999-11-29 | 2003-05-06 | Seagate Technology, Llc | Perpendicular recording head defining the trackwidth by material deposition thickness |
| US6646827B1 (en) | 2000-01-10 | 2003-11-11 | Seagate Technology Llc | Perpendicular magnetic recording head with write pole which reduces flux antenna effect |
| US6693768B1 (en) | 2000-03-15 | 2004-02-17 | Seagate Technology Llc | Perpendicular magnetic recording head having a flux focusing main pole |
| US6717770B1 (en) | 2000-03-24 | 2004-04-06 | Seagate Technology Llc | Recording head for applying a magnetic field perpendicular to the magnetizations within magnetic storage media |
| US6798615B1 (en) | 2000-03-24 | 2004-09-28 | Seagate Technology Llc | Perpendicular recording head with return poles which reduce flux antenna effect |
| US6999257B2 (en) * | 2001-01-31 | 2006-02-14 | Kabushiki Kaisha Toshiba | Magnetic disk drive with structure for avoiding DC magnetic disturbance on a disk surface |
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