公开(公告)号：US20050057853A1

公开(公告)日：2005-03-17

申请号：US10974807

申请日：2004-10-28

申请人： Atsushi Nakamura ,  Masafumi Mochizuki ,  Tomohiro Okada ,  Kimitoshi Etoh ,  Isao Nunokawa ,  Yoshiaki Kawato

发明人： Atsushi Nakamura ,  Masafumi Mochizuki ,  Tomohiro Okada ,  Kimitoshi Etoh ,  Isao Nunokawa ,  Yoshiaki Kawato

IPC分类号： G11B5/31 ,  G11B5/02 ,  G11B5/127 ,  G11B5/187

CPC分类号： G11B5/1871 ,  G11B5/127 ,  G11B5/1278 ,  G11B5/187 ,  G11B5/3146

摘要： A magnetic head having at least a main pole having a profile on a magnetic head air bearing surface composed of a first portion having a length in a cross-track direction which continuously increases from a leading edge to a trailing edge, and a second portion located on the side of the trailing edge of the first portion. A length of the second portion in the cross-track direction at the trailing edge is substantially equal to a length in the cross-track direction at the point of contact between the first and second portions. A rate of change in the length of the second portion in the cross-track direction from the leading edge to the trailing edge is different from a rate of increase in the length of the first portion in the cross-track direction.

摘要翻译： 一种磁头，其至少具有在磁头空气轴承表面上具有轮廓的主极，该磁头由从前缘到后缘连续增加的横向方向上的长度的第一部分和位于 在第一部分的后缘侧。 在后缘处的交叉轨道方向上的第二部分的长度基本上等于第一和第二部分之间的接触点处的交叉轨道方向上的长度。 从前缘到后缘的交叉轨道方向上的第二部分的长度的变化率与跨轨道方向上的第一部分的长度的增加速率不同。

公开(公告)号：US06813116B2

公开(公告)日：2004-11-02

申请号：US10314156

申请日：2002-12-09

申请人： Atsushi Nakamura ,  Masafumi Mochizuki ,  Tomohiro Okada ,  Kimitoshi Etoh ,  Isao Nunokawa ,  Yoshiaki Kawato

发明人： Atsushi Nakamura ,  Masafumi Mochizuki ,  Tomohiro Okada ,  Kimitoshi Etoh ,  Isao Nunokawa ,  Yoshiaki Kawato

IPC分类号： G11B5187

CPC分类号： G11B5/1871 ,  G11B5/127 ,  G11B5/1278 ,  G11B5/187 ,  G11B5/3146

摘要： A single-pole type magnetic head for perpendicular recording which reduces the amount of side writing even in the presence of a yaw angle and prevents the effective track width from decreasing, and a magnetic recording disk apparatus using the same. A main pole is composed of at least two portions where the width of the first portion continuously increases from the upstream side to the downstream side in the medium moving direction and the width of the second portion is the same as the width of the first portion's downstream edge in the medium moving direction and is constant from the upstream side to the downstream side in the medium moving direction. This prevents the recording magnetic field strength from decreasing at the track edge and increases the effective track width while suppressing side writing, thereby realizing a magnetic recording disk apparatus with a high track density.

摘要翻译： 一种用于垂直记录的单极型磁头，即使在存在偏航角的情况下也减少了侧面写入量，并且防止了有效轨道宽度的减小，以及使用该磁头的磁记录盘装置。 主极由至少两个部分组成，其中第一部分的宽度在介质移动方向上从上游侧到下游侧连续增加，第二部分的宽度与第一部分的下游的宽度相同 在介质移动方向上边缘并且在介质移动方向上从上游侧到下游侧是恒定的。 这防止记录磁场强度在轨道边缘处减小，并且在抑制侧面写入的同时增加有效轨道宽度，从而实现具有高轨道密度的磁记录盘装置。

公开(公告)号：US06710973B2

公开(公告)日：2004-03-23

申请号：US09920648

申请日：2001-08-03

申请人： Tomohiro Okada ,  Yoshiaki Kawato ,  Yasutaka Nishida ,  Yasuo Wakaki ,  Masafumi Mochizuki ,  Hisashi Takano

发明人： Tomohiro Okada ,  Yoshiaki Kawato ,  Yasutaka Nishida ,  Yasuo Wakaki ,  Masafumi Mochizuki ,  Hisashi Takano

IPC分类号： G11B5127

CPC分类号： G11B5/1278 ,  G11B5/012 ,  Y10S977/934 ,  Y10S977/935

摘要： A magnetic head for perpendicular recording without writing from the lateral sides of a main pole and without erasing data on adjacent tracks. A magnetic disk storage apparatus using the magnetic head. The lateral side of the main pole of a magnetic head for perpendicular recording may have an inverted tapered shape obtained by forming a groove as a track portion to an inorganic insulating layer and then forming a magnetic layer and then flattening the upper surface. A leading edge, a trailing edge, or both lateral edges of the magnetic head may be tapered. The taper may be either smooth and linear or curved in profile.

摘要翻译： 用于垂直记录的磁头，无需从主极的侧面进行写入，而不会在相邻轨道上擦除数据。 一种使用该磁头的磁盘存储装置。 用于垂直记录的磁头的主极的侧面可以具有通过在无机绝缘层上形成作为轨道部分的槽然后形成磁性层然后使上表面变平而获得的倒锥形。 磁头的前缘，后缘或两个侧边缘可以是锥形的。 锥形可以是平滑的，线性的或弯曲的。

公开(公告)号：US5936810A

公开(公告)日：1999-08-10

申请号：US795646

申请日：1997-02-06

申请人： Kazuhiro Nakamoto ,  Yoshiaki Kawato

发明人： Kazuhiro Nakamoto ,  Yoshiaki Kawato

IPC分类号： G11B5/39

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3903 ,  G11B5/3932 ,  G11B5/399 ,  G11B2005/3996

摘要： A magnetoresistive effect head which can produce a high reproduced output independently from a strength of a magnetic domain control layer even when an electrode spacing is small, and a magnetic recording and reproducing apparatus using the same are provided. A magnetoresistive effect film is formed by a stacked layer of a first ferromagnetic film, a non-magnetic conductive film and a second ferromagnetic film. The second ferromagnetic film is stacked on an antiferromagnetic film, and magnetic domain control layers are arranged on the widthwise opposite sides of the magnetoresistive effect film. A pair of electrodes are arranged on each magnetic domain control layers with the electrode spacing being smaller than the width of the magnetoresistive effect film so that a current flows only in a central area of the magnetoresistive effect film.

公开(公告)号：US08462468B2

公开(公告)日：2013-06-11

申请号：US13095450

申请日：2011-04-27

申请人： Hiroyuki Katada ,  Takayuki Ichihara ,  Yoshiaki Kawato

发明人： Hiroyuki Katada ,  Takayuki Ichihara ,  Yoshiaki Kawato

IPC分类号： G11B5/33 ,  G11B5/127

CPC分类号： G11B5/3912 ,  G11B5/1278 ,  G11B5/3967

摘要： In a magnetic head to be used for a shingled recording method, degradation of a signal resolution and a decrease in a signal-to-noise ratio which are caused by an asymmetrical inter-bit transition curvature are prevented, and a low bit error rate is realized. A magnetic head includes a recording head and a reproducing head. The reproducing head includes a pair of magnetic shields and a sensor sandwiched between the pair of magnetic shields. The gap between the magnetic shields is formed so that the longitudinal direction thereof gets inclined by a certain angle with respect to a cross-track direction in line with the shape of a curvature of an inter-bit transition on an effective record track in a record pattern recorded on a recording medium.

摘要翻译： 在用于带状闪烁记录方法的磁头中，防止由不对称的位间位移变化曲线引起的信号分辨率的劣化和信噪比的降低，并且低位错误率是 实现了 磁头包括记录头和再现头。 再现头包括一对磁屏蔽和夹在该对屏蔽之间的传感器。 磁屏蔽之间的间隙形成为使得其纵向相对于横向方向倾斜一定角度，与记录中的有效记录轨道上的位间转换的曲率的形状相对应 记录在记录介质上的图案。

公开(公告)号：US20050214587A1

公开(公告)日：2005-09-29

申请号：US11103594

申请日：2005-04-12

申请人： Yoshiaki Kawato ,  Masaaki Futamoto ,  Kazuhiro Nakamoto

发明人： Yoshiaki Kawato ,  Masaaki Futamoto ,  Kazuhiro Nakamoto

IPC分类号： G11B5/667 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/738

CPC分类号： G11B5/66

摘要： An improved perpendicular magnetic recording medium and an improved magnetic storage apparatus are provided, which are suitable for high speed and high density magnetic recording. A magnetic under layer of a two-layered perpendicular magnetic recording medium includes three layers: a ferromagnetic layer; a non-magnetic layer; and a ferromagnetic layer, wherein the ferromagnetic layers are antiferromagnetically coupled with each other, thereby preventing a magnetic flux from a magnetic wall in a magnetic under layer from entering a read back head.

摘要翻译： 提供了一种改进的垂直磁记录介质和改进的磁存储装置，其适用于高速和高密度磁记录。 双层垂直磁记录介质的磁性底层包括三层：铁磁层; 非磁性层; 和铁磁层，其中所述铁磁层彼此反铁磁耦合，从而防止来自磁性底层中的磁壁的磁通量进入回读头。

公开(公告)号：US20050163962A1

公开(公告)日：2005-07-28

申请号：US10893887

申请日：2004-07-20

申请人： Yoshiaki Kawato ,  Kenchi Ito

发明人： Yoshiaki Kawato ,  Kenchi Ito

IPC分类号： G11B5/02 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/738 ,  G11B11/10 ,  G11B11/105

CPC分类号： G11B5/656 ,  G11B5/65 ,  G11B5/66 ,  Y10T428/265

摘要： A perpendicular magnetic recording medium for thermo-magnetic printing has an ultra-high recording density and is resistant to thermal decay of magnetization. An intermediate layer of the medium is provided between a first recording layer using a low-noise Co alloy ferromagnetic substance and a second recording layer using a ferrimagnetic substance (e.g., a rare-earth element-transition metal compound) having a compensation temperature below an operation ambient temperature. A magnetic field is applied thereto to form a magnetization pattern on the first recording layer. It is then heated-up to be printed onto the second recording layer, which has a higher coercivity at the ambient temperature, and a recording field is suitably set to form a magnetization pattern only on the first recording layer. The magnetization pattern is printed from the first recording layer to the second recording layer.

摘要翻译： 用于热磁性印刷的垂直磁记录介质具有超高记录密度，并且耐磁化热衰减。 介质的中间层设置在使用低噪声Co合金铁磁性物质的第一记录层和使用补偿温度低于1的亚铁磁物质（例如，稀土元素 - 过渡金属化合物）的第二记录层之间 操作环境温度。 施加磁场以在第一记录层上形成磁化模式。 然后将其加热印刷到在环境温度下具有较高矫顽力的第二记录层上，并且适当地设置记录场以仅在第一记录层上形成磁化图案。 磁化图案从第一记录层印刷到第二记录层。

公开(公告)号：US06785097B2

公开(公告)日：2004-08-31

申请号：US10068986

申请日：2002-02-11

申请人： Tomohiro Okada ,  Yoshiaki Kawato ,  Kaori Suzuki ,  Hiroshi Fukui ,  Isao Nunokawa

发明人： Tomohiro Okada ,  Yoshiaki Kawato ,  Kaori Suzuki ,  Hiroshi Fukui ,  Isao Nunokawa

IPC分类号： G11B511

CPC分类号： G11B5/1278 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/3967 ,  G11B2005/0029 ,  Y10T29/49032 ,  Y10T29/49034 ,  Y10T29/49037 ,  Y10T29/49043 ,  Y10T29/49044

摘要： The invention fabricates a perpendicular recording head eliminating influence of external magnetic field and provides a magnetic disk drive having high stability by using the magnetic recording head and constructs a structure in which shield against external magnetic field is formed from a main pole via a gap layer and an edge portion thereof is recessed from a surface against a medium. By providing the shield against the external magnetic field, the influence of the external magnetic field is restrained and by recessing the edge from the surface against the medium, leakage of magnetic field from the shield against the external magnetic field to the medium is prevented to thereby prevent a magnetization signal from being erased.

摘要翻译： 本发明制造了一种消除外部磁场的影响的垂直记录头，并且通过使用磁记录头提供了具有高稳定性的磁盘驱动器，并构成了通过间隙层从主极形成屏蔽外部磁场的结构， 其边缘部分相对于介质从表面凹陷。 通过为外部磁场提供屏蔽，可以抑制外部磁场的影响，并且通过使表面的边缘相对于介质凹陷，防止磁场从外部磁场向介质的磁场泄漏到介质，由此 防止磁化信号被擦除。

公开(公告)号：US06657823B2

公开(公告)日：2003-12-02

申请号：US09941795

申请日：2001-08-30

申请人： Yoshiaki Kawato

发明人： Yoshiaki Kawato

IPC分类号： G11B539

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G01R33/093 ,  G11B5/012 ,  G11B5/3909 ,  G11B5/3954 ,  G11B2005/0029

摘要： An object of the present invention is to provide a differential detection read sensor for perpendicular magnetic recording using two magnetic resistance elements; and to provide a thin film head for perpendicular recording using the read sensor and a magnetic recording apparatus having high recording density equipped with the head. The object of the present invention can be achieved by a reproducing sensor comprising a pair of magnetic resistance layers; a non-magnetic conductive layer; a pair of conductive layers; and a pair of magnetic shields.

公开(公告)号：US06327123B1

公开(公告)日：2001-12-04

申请号：US09368472

申请日：1999-08-04

申请人： Yoshiaki Kawato ,  Hiroshi Fukui ,  Kenichi Meguro ,  Yoshihiro Hamakawa

发明人： Yoshiaki Kawato ,  Hiroshi Fukui ,  Kenichi Meguro ,  Yoshihiro Hamakawa

IPC分类号： G11B5127

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3903 ,  G11B5/3909 ,  G11B5/3967 ,  G11B2005/3996

摘要： A magnetic head is provided with a magnetoresistive sensor scarcely susceptible to heat and provided with a fixed layer capable of creating a pinned magnetic field of a sufficient intensity. The magnetic head comprises a magnetoresistive effect film having a free layer (21), a fixed layer (105) and an intermediate layer (104), and a pair of electrodes (25a, 25b) for supplying current to the magnetoresistance effect film. The free layer (21) is formed of a ferromagnetic material and the intermediate layer (104) is formed of a nonmagnetic material. The fixed layer (105) has a first ferromagnetic film (22), a second ferromagnetic film (24) and a nonmagnetic film (23) sandwiched between the first and the second ferromagnetic films (22, 24). The second ferromagnetic film (24) farther from the free layer (21) than the first ferromagnetic layer (22) is formed of a material having the property of permanent magnets. The magnetization of the fist ferromagnetic film (22) and that of the second ferromagnetic film (24) are coupled in an antiferromagnetic coupling fashion.

摘要翻译： 磁头设置有几乎不易受热的磁阻传感器，并且具有能够产生足够强度的固定磁场的固定层。 磁头包括具有自由层（21），固定层（105）和中间层（104）的磁阻效应膜和用于向磁阻效应膜提供电流的一对电极（25a，25b）。 自由层（21）由铁磁材料形成，中间层（104）由非磁性材料形成。 固定层（105）具有夹在第一和第二铁磁性膜（22,24）之间的第一铁磁膜（22），第二铁磁膜（24）和非磁性膜（23）。 离开自由层（21）比第一铁磁层（22）更远的第二铁磁膜（24）由具有永磁体性质的材料形成。 第一铁磁膜（22）和第二铁磁膜（24）的磁化以反铁磁耦合方式耦合。