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    • 3. 发明授权
    • Magnetic disk device having mechanism for detecting projections on recording medium
    • 具有用于检测记录介质上的投影的机构的磁盘装置
    • US08144412B2
    • 2012-03-27
    • US12591562
    • 2009-11-24
    • Hiroshi Kiyono
    • Hiroshi Kiyono
    • G11B5/02G11B27/36G11B5/127G11B5/60G11B15/64G11B17/32G11B21/20
    • G11B5/40G11B5/6005
    • A thin film magnetic head includes a medium projection detection mechanism that detects a projection on the surface of a recording medium. The medium projection detection mechanism has a discharging electrode, a capacitor, and an input line and an output line that are connected to the discharging electrode. The discharging electrode is configured to receive a voltage applied through the input line, and the capacitor is configured to store electric charge by the applied voltage. The output line is connected to a projection detection processing system and is connected to the charging electrode and the projection detection processing system to detect the location of the projection that is a detection target by detecting voltage change that is caused by discharging between the discharging electrode and the projection when the projection is detected.
    • 薄膜磁头包括检测记录介质表面上的突起的介质投影检测机构。 介质投影检测机构具有连接到放电电极的放电电极,电容器,输入线和输出线。 放电电极被配置为接收通过输入线施加的电压,并且电容器被配置为通过施加的电压来存储电荷。 输出线连接到投影检测处理系统,并连接到充电电极和投影检测处理系统,通过检测由放电电极和放电电极之间的放电引起的电压变化来检测作为检测对象的投影的位置 检测投影时的投影。
    • 4. 发明授权
    • Thin-film magnetic head comprising a magneto-resistive effect device of a CPP structure and having a shunting layer
    • 薄膜磁头包括CPP结构的磁阻效应器件并具有分流层
    • US07894168B2
    • 2011-02-22
    • US11846170
    • 2007-08-28
    • Hiroshi KiyonoTetsuya Kuwashima
    • Hiroshi KiyonoTetsuya Kuwashima
    • G11B5/39
    • G11B5/398B82Y25/00G01R33/093
    • The invention provides a thin-film magnetic head having a magneto-resistive effect device of the CPP (current perpendicular to plane) structure comprising a multilayer film in which a fixed magnetization layer, a nonmagnetic layer and a free layer are stacked together in order. The fixed magnetization layer, nonmagnetic layer and free layer extend away from an air bearing surface that is a plane in opposition to a medium, the length of the fixed magnetization layer in a depth direction normal to said air bearing surface is greater than the length of the free layer in the depth direction. A shunt layer for shunting the sense current is located at a farther distance in the depth direction than the free layer, and the shunt layer is separated from the free layer by a constant gap in the depth direction.
    • 本发明提供一种具有CPP(电流垂直于平面)结构的磁阻效应器件的薄膜磁头,其包括多层膜,其中固定磁化层,非磁性层和自由层按顺序堆叠在一起。 固定磁化层,非磁性层和自由层远离与介质相反的平面的空气轴承表面延伸,固定磁化层在垂直于所述空气轴承表面的深度方向上的长度大于 自由层在深度方向。 用于分流感测电流的并联层位于深度方向上比自由层更远的距离,并且分流层在深度方向上通过恒定的间隙与自由层分离。
    • 5. 发明申请
    • THIN-FILM MAGNETIC HEAD HAVING CPP STRUCTURE MAGNETO-RESISTIVE EFFECT DEVICE
    • 具有CPP结构磁电阻效应器件的薄膜磁头
    • US20090059436A1
    • 2009-03-05
    • US11846170
    • 2007-08-28
    • Hiroshi KiyonoTetsuya Kuwashima
    • Hiroshi KiyonoTetsuya Kuwashima
    • G11B5/33
    • G11B5/398B82Y25/00G01R33/093
    • The invention provides a thin-film magnetic head having a magneto-resistive effect device of the CPP (current perpendicular to plane) structure comprising a multilayer film in which a fixed magnetization layer, a nonmagnetic layer and a free layer are stacked together in order. The fixed magnetization layer, nonmagnetic layer and free layer extend rearward from an air bearing surface that is a plane in opposition to a medium, the length of the depth-wise side of the fixed magnetization layer is longer than that of the free layer, and a shunt layer for shunting a sense current is formed more on the depth-wise side of, and kept constantly away from, the free layer. There are thus much more favorable advantages obtained: even when device size is further reduced and narrowed, degradation of frequency characteristics is hold back, any increase in the thermal magnetic noise is stayed off, and performance fluctuations are minimized.
    • 本发明提供一种具有CPP(电流垂直于平面)结构的磁阻效应器件的薄膜磁头,其包括多层膜,其中固定磁化层,非磁性层和自由层按顺序堆叠在一起。 固定磁化层,非磁性层和自由层从作为与介质相反的平面的空气轴承表面向后延伸,固定磁化层的深度方向的长度比自由层的长度长, 用于分流感测电流的并联层更多地形成在自由层的深度方面并且保持不断地远离自由层。 因此,获得了更多有利的优点:即使当器件尺寸进一步减小和变窄时,频率特性的劣化被阻止,热磁噪声的任何增加都将被停止,并且性能波动最小化。
    • 9. 发明授权
    • Magnetic recording device and magnetic recording method
    • 磁记录装置和磁记录方法
    • US08665548B2
    • 2014-03-04
    • US13047304
    • 2011-03-14
    • Kei HirataHiroshi KiyonoOsamu NakadaKenkichi Anagawa
    • Kei HirataHiroshi KiyonoOsamu NakadaKenkichi Anagawa
    • G11B21/02
    • G11B5/315G11B5/012G11B5/1278G11B5/3116
    • A magnetic disk device includes: a recording medium provided with a plurality of write tracks; a magnetic write head including a magnetic pole, side shields, and a leading shield, a distance from the magnetic pole to each of the side shields being maintained to be uniform with a gap layer therebetween, and a distance from the magnetic pole to the leading shield being maintained to be uniform with a gap layer therebetween; and a control section rotating the recording medium, and allowing magnetic information to be recorded on the recording medium while allowing the magnetic write head to travel in a direction from an inner write track toward an outer write track or in a direction from the outer write track toward the inner write track, across write tracks in the recording medium. With such a configuration, format efficiency may be improved, and a width of an erase band on a magnetic disk may be minimized. Therefore, surface recording density of a recording medium may be improved without reducing an effective write track width.
    • 磁盘装置包括:设置有多个写入磁道的记录介质; 包括磁极,侧屏蔽和前屏蔽的磁写头,从磁极到每个侧屏的距离保持均匀,其间具有间隙层,并且从磁极到前导的距离 保持其间的间隙均匀的护罩; 以及控制部分,使记录介质旋转,并且允许磁信息被记录在记录介质上,同时允许磁性写入头沿着从内部写入磁道朝向外部写入磁道或从外部写入磁道的方向行进 朝向内部写入轨道,跨越记录介质中的写入轨迹。 利用这种配置,可以提高格式效率,并且可以使磁盘上的擦除带的宽度最小化。 因此,可以提高记录介质的表面记录密度,而不会降低有效的写入磁道宽度。
    • 10. 发明授权
    • Thermally-assisted magnetic recording method for writing data on a hard disk medium
    • 用于在硬盘介质上写入数据的热辅助磁记录方法
    • US08374060B2
    • 2013-02-12
    • US13046117
    • 2011-03-11
    • Koji ShimazawaTomohito MizunoHiroshi Kiyono
    • Koji ShimazawaTomohito MizunoHiroshi Kiyono
    • G11B11/00
    • G11B5/65G11B5/314G11B5/6088G11B5/66G11B2005/0021
    • A thermally-assisted magnetic recording method includes first and second steps. The first step applies heat to part of a hard disk medium and forms a moving high-temperature region in a magnetic recording layer of the hard disk medium. The high-temperature region is higher in temperature than a region therearound and has a temperature equal to or higher than the maximum coercivity vanishing temperature of a plurality of magnetic grains contained in the magnetic recording layer. At least one magnetic grain that is adjacent to the rear end of the high-temperature region in the direction of movement of the high-temperature region has a coercivity of a value other than 0. The second step applies a write magnetic field to the hard disk medium such that the write magnetic field applied to the at least one magnetic grain adjacent to the rear end of the high-temperature region is 3 kOe or smaller in magnitude.
    • 热辅助磁记录方法包括第一和第二步骤。 第一步骤将热量施加到硬盘介质的一部分上,并在硬盘介质的磁记录层中形成移动的高温区域。 高温区域的温度高于其周围的区域,并且具有等于或高于包含在磁记录层中的多个磁性颗粒的最大矫顽力消失温度的温度。 在高温区域的移动方向上与高温区域的后端相邻的至少一个磁性颗粒具有除了0以外的值的矫顽力。第二步骤将写入磁场施加到硬 使得施加到与高温区域的后端相邻的至少一个磁性颗粒的写入磁场的大小为3kOe以下。