公开(公告)号：US07852603B2

公开(公告)日：2010-12-14

申请号：US11676113

申请日：2007-02-16

申请人： Kiyoshi Kobayashi ,  Hiroshi Kameda

发明人： Kiyoshi Kobayashi ,  Hiroshi Kameda

IPC分类号： G11B5/187

CPC分类号： G11B5/3116 ,  G11B5/1278

摘要： A perpendicular magnetic recording head is provided. The perpendicular magnetic recording head includes a main magnetic pole layer overlapped with a sub-yoke layer. The sub-yoke layer having a multiple-magnetic domain includes a magnetic domain having dominant track-widthwise component in contact with a front end face of the sub-yoke layer. A main magnetic pole layer 24 is overlapped with the magnetic domain 35b and is affected by the magnetic domain 35b.

摘要翻译： 提供垂直磁记录头。 垂直磁记录头包括与副轭铁层重叠的主磁极层。 具有多磁畴的子轭层包括具有与副轭铁层的前端面接触的主导轨宽分量的磁畴。 主磁极层24与磁畴35b重叠，受磁畴35b的影响。

公开(公告)号：US20060164756A1

公开(公告)日：2006-07-27

申请号：US11336250

申请日：2006-01-20

申请人： Hiroshi Kameda ,  Kiyoshi Kobayashi

发明人： Hiroshi Kameda ,  Kiyoshi Kobayashi

IPC分类号： G11B5/127

CPC分类号： G11B5/3146 ,  G11B5/1278 ,  G11B5/3116

摘要： An auxiliary magnetic section has a multilayer structure consisting of auxiliary magnetic layers and a non-magnetic layer and a first auxiliary magnetic layer is bonded to a main magnetic pole layer. This allows the auxiliary magnetic layers to have large induced magnetic anisotropy due to antiferromagnetic coupling in a track width direction. Since the first auxiliary magnetic layer is ferromagnetically coupled with the main magnetic pole layer, the magnetization of the main magnetic pole layer can be more properly directed in the track width direction as compared to known main magnetic pole layers and has low remanence. This leads to an increase in magnetic recording efficiency.

摘要翻译： 辅助磁区具有由辅助磁性层和非磁性层构成的多层结构，第一辅助磁性层与主磁极层接合。 这允许辅助磁性层由于在磁道宽度方向上的反铁磁耦合而具有大的感应磁各向异性。 由于第一辅助磁性层与主磁极层铁磁耦合，所以与已知的主磁极层相比，主磁极层的磁化能够更加适合于轨道宽度方向，并且具有低剩磁。 这导致磁记录效率的提高。

公开(公告)号：US08054578B2

公开(公告)日：2011-11-08

申请号：US12112494

申请日：2008-04-30

申请人： Hiroshi Kameda ,  Kiyoshi Kobayashi

发明人： Hiroshi Kameda ,  Kiyoshi Kobayashi

IPC分类号： G11B5/31 ,  G11B5/11 ,  G11B5/23

CPC分类号： G11B5/3116 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/23 ,  G11B5/3146 ,  G11B5/315

摘要： A perpendicular magnetic recording head includes a main magnetic pole layer and a return yoke layer which are laminated with a magnetic gap layer interposed therebetween on a medium-opposing surface, and a pair of side shield layers positioned on both sides in the track width direction of the main magnetic pole layer while interposing a nonmagnetic material layer therebetween. The magnetic gap layer is constituted by a first gap layer formed in a partial area in the track width direction bridging the main magnetic pole layer and the pair of side shield layers, and a second gap layer thinner than the first gap layer and interposed between the return yoke layer and the pair of side shield layers in a remaining area where the first gap layer is absent.

摘要翻译： 垂直磁记录头包括在中间相对表面上层叠有间隙层的主磁极层和返回磁轭层，以及位于磁道宽度方向两侧的一对侧屏蔽层 主磁极层，同时在其间插入非磁性材料层。 磁隙层由形成在桥接主磁极层和一对侧屏蔽层的磁道宽度方向的局部区域中的第一间隙层和比第一间隙层更薄的第二间隙层构成， 在第一间隙层不存在的剩余区域中的返回轭层和一对侧屏蔽层。

公开(公告)号：US08049988B2

公开(公告)日：2011-11-01

申请号：US12112552

申请日：2008-04-30

申请人： Hiroshi Kameda ,  Kiyoshi Kobayashi

发明人： Hiroshi Kameda ,  Kiyoshi Kobayashi

IPC分类号： G11B5/31 ,  G11B5/11 ,  G11B5/23

CPC分类号： G11B5/3116 ,  G11B5/1278 ,  G11B5/315

摘要： In a perpendicular magnetic recording head including a main magnetic pole layer and a return yoke layer which are laminated with a magnetic gap layer interposed therebetween on a medium-opposing surface, and a pair of side shield layers positioned on both sides in the track width direction of the main magnetic pole layer while interposing a nonmagnetic material layer therebetween, the magnetic gap layer is formed in a partial area in the track width direction bridging the main magnetic pole layer and the pair of side shield layers. The pair of side shield layers are in contact with the return yoke layer in a remaining area where the magnetic gap layer is absent.

摘要翻译： 在包括主磁极层和返回磁轭层的垂直磁记录头中，介于介质相对表面之间层叠有间隙层，并且在轨道宽度方向上位于两侧的一对侧屏蔽层 的主磁极层，同时在其间插入非磁性材料层，磁隙层形成在桥接主磁极层和一对侧屏蔽层的轨道宽度方向上的局部区域中。 所述一对侧屏蔽层在不存在磁隙层的剩余区域中与返回磁轭层接触。

公开(公告)号：US07742259B2

公开(公告)日：2010-06-22

申请号：US11676139

申请日：2007-02-16

申请人： Hiroshi Kameda ,  Kiyoshi Kobayashi

发明人： Hiroshi Kameda ,  Kiyoshi Kobayashi

IPC分类号： G11B5/39

CPC分类号： G11B5/3116 ,  G11B5/1278

摘要： Particularly, there is provided a perpendicular magnetic recording head capable of suppressing PTP and obtaining a stabilized recording ability by improving the shape of the opposed surface of a return yoke layer and a method of manufacturing the same. The shape of the return yoke layer on the opposed surface includes a downside formed linearly parallel to a track width direction (X direction shown in the drawing), a center portion where a protrusion portion having a maximum width T1 larger than a track width Tw by protruding upwardly is formed in a position opposed to a main magnetic pole layer in a film thickness direction (Z direction shown in the drawing), and opposed end portions, having a film thickness smaller than the center portion, that extend on the opposite sides in the track width direction of the center portion. As a result, it is possible to properly obtain both effects such as the improvement of the recording ability and the suppressing of PTP generation.

摘要翻译： 特别地，提供了能够抑制PTP并通过改进返回磁轭层的相对表面的形状来获得稳定的记录能力的垂直磁记录头及其制造方法。 在相对的表面上的返回轭层的形状包括直线平行于轨道宽度方向（图中所示的X方向）形成的下侧，其中中心部分具有大于轨道宽度Tw的最大宽度T1的突起部分， 在膜厚度方向（图示的Z方向）上与主磁极层相对的位置上形成有相对的端部，其厚度比中心部分小，在相对侧延伸， 中心部分的轨道宽度方向。 结果，可以适当地获得诸如提高记录能力和抑制PTP产生的两种效果。

公开(公告)号：US20050219764A1

公开(公告)日：2005-10-06

申请号：US11092205

申请日：2005-03-29

申请人： Hiroshi Kameda ,  Kiyoshi Kobayashi

发明人： Hiroshi Kameda ,  Kiyoshi Kobayashi

IPC分类号： G11B5/31 ,  G11B5/127 ,  G11B5/33

CPC分类号： G11B5/1278

摘要： A concave portion is formed on the end surface of a main magnet pole layer on the trailing side. A convex portion is formed on the end surface of a return yoke layer on the leading side, which opposes the concave portion formed on the end surface of the main magnet pole layer on the trailing side, and the distance (gap length) between the main magnet pole layer and the return yoke layer in the direction of the film thickness is constant. Consequently, the magnetic field generating from the main magnet pole layer toward the recording medium is appropriately prevented from isotropically spreading in the trailing direction, and the width of magnetization reversal between the recording patterns, which are magnetized reversely from each other, can be reduced over the entire area.

摘要翻译： 在后侧的主磁极层的端面上形成有凹部。 在前侧的返回轭铁层的与后侧的主磁极层的端面上形成的凹部相对的返回轭层的端面上形成有凸部，主体的主体磁极层之间的距离（间隙长度） 磁极层和返回磁轭层在膜厚度方向上是恒定的。 因此，适当地防止从主磁极层朝向记录介质产生的磁场在向后方向上各向同性地扩展，并且可以减少彼此反向磁化的记录图案之间的磁化反转宽度 整个地区。

公开(公告)号：US07436628B2

公开(公告)日：2008-10-14

申请号：US11092205

申请日：2005-03-29

申请人： Hiroshi Kameda ,  Kiyoshi Kobayashi

发明人： Hiroshi Kameda ,  Kiyoshi Kobayashi

IPC分类号： G11B5/187 ,  G11B5/147

CPC分类号： G11B5/1278

摘要： A concave portion is formed on the end surface of a main magnet pole layer on the trailing side. A convex portion is formed on the end surface of a return yoke layer on the leading side, which opposes the concave portion formed on the end surface of the main magnet pole layer on the trailing side, and the distance (gap length) between the main magnet pole layer and the return yoke layer in the direction of the film thickness is constant. Consequently, the magnetic field generating from the main magnet pole layer toward the recording medium is appropriately prevented from isotropically spreading in the trailing direction, and the width of magnetization reversal between the recording patterns, which are magnetized reversely from each other, can be reduced over the entire area.

摘要翻译： 在后侧的主磁极层的端面上形成有凹部。 在前侧的返回轭铁层的与后侧的主磁极层的端面上形成的凹部相对的返回轭层的端面上形成有凸部，主体的主体磁极层之间的距离（间隙长度） 磁极层和返回磁轭层在膜厚度方向上是恒定的。 因此，适当地防止从主磁极层朝向记录介质产生的磁场在向后方向上各向同性地扩展，并且可以减少彼此反向磁化的记录图案之间的磁化反转宽度 整个地区。

公开(公告)号：US20070195455A1

公开(公告)日：2007-08-23

申请号：US11676113

申请日：2007-02-16

申请人： Kiyoshi Kobayashi ,  Hiroshi Kameda

发明人： Kiyoshi Kobayashi ,  Hiroshi Kameda

IPC分类号： G11B5/147

CPC分类号： G11B5/3116 ,  G11B5/1278

摘要： A perpendicular magnetic recording head is provided. The perpendicular magnetic recording head includes a main magnetic pole layer overlapped with a sub-yoke layer. The sub-yoke layer having a multiple-magnetic domain includes a magnetic domain having dominant track-widthwise component in contact with a front end face of the sub-yoke layer. A main magnetic pole layer 24 is overlapped with the magnetic domain 35b and is affected by the magnetic domain 35b.

摘要翻译： 提供垂直磁记录头。 垂直磁记录头包括与副轭铁层重叠的主磁极层。 具有多磁畴的子轭层包括具有与副轭铁层的前端面接触的主导轨宽分量的磁畴。 主磁极层24与磁畴35b重叠，并受到磁畴35b的影响。

公开(公告)号：US08085184B2

公开(公告)日：2011-12-27

申请号：US12421926

申请日：2009-04-10

申请人： Yuuki Takabayashi ,  Hiroshi Kameda

发明人： Yuuki Takabayashi ,  Hiroshi Kameda

IPC分类号： G01S13/00 ,  G01S13/08 ,  G01S13/58

CPC分类号： G01S13/931 ,  G01S13/343 ,  G01S13/584 ,  G01S2013/9325

摘要： According to a conventional method of correlating beat frequencies in a radar device, a detecting state of a target differs at the time of up-chirping and at that of down-chirping, so that, when the number of peaks of beat frequencies does not match with each other, there occurs a situation in which the beat frequencies cannot be accurately correlated.The radar device herein provided includes a transmission unit for transmitting a frequency-modulated continuous wave (FMCW) signal; a reception unit for generating a beat signal from the transmission signal and a reception signal corresponding thereto; a beat-frequency generating unit for obtaining a beat-frequency distribution corresponding to the beat signal; an up-chirp beat-frequency tracking means and a down-chirp beat-frequency tracking means for performing tracking processing on a beat signal; and an up-chirp target-detection means and a down-chirp target-detection means for calculating a range and range-change rate to a target based on a beat signal's frequency distribution.

摘要翻译： 根据雷达装置中的拍频相关的常规方法，目标的检测状态在向上啁啾时和在下啁啾时的检测状态不同，使得当拍频的峰值数不匹配时 彼此发生拍频不能被精确相关的情况。 本文提供的雷达装置包括用于发送调频连续波（FMCW）信号的发送单元; 接收单元，用于从所述发送信号产生拍频信号和与其对应的接收信号; 拍频产生单元，用于获得对应于拍子信号的拍频分布; 用于对拍子信号进行跟踪处理的向上啁啾拍频跟踪装置和下啁啾拍频调频装置; 以及向上啁啾目标检测装置和下行啁啾目标检测装置，用于基于拍子信号的频率分布来计算对目标的范围和范围变化率。

公开(公告)号：US08064164B2

公开(公告)日：2011-11-22

申请号：US12124217

申请日：2008-05-21

申请人： Tomohiro Yamashita ,  Hiroshi Kameda ,  Katsuhiko Otomo

发明人： Tomohiro Yamashita ,  Hiroshi Kameda ,  Katsuhiko Otomo

IPC分类号： G11B5/127

CPC分类号： G11B5/1278 ,  G11B5/3123 ,  G11B5/3133

摘要： In a perpendicular magnetic recording head comprising a main magnetic pole layer and a return yoke layer which have respective front end faces exposed at a surface opposing a recording medium and are laminated with a nonmagnetic material layer interposed therebetween on the medium-opposing surface, an end magnetization control layer for generating an exchange-coupling field is provided on the upper or lower side of both end parts in a track width direction of the return yoke layer. The exchange-coupling field fixes magnetization in the end parts to the track width direction.

摘要翻译： 在包括主磁极层和返回磁轭层的垂直磁记录头中，其具有在与记录介质相对的表面处暴露的相应的前端面，并且在介质相对表面上层叠有非磁性材料层， 用于产生交换耦合场的磁化控制层设置在返回磁轭层的轨道宽度方向上的两个端部的上侧或下侧。 交换耦合场将端部中的磁化固定到轨道宽度方向。