公开(公告)号：US08810946B2

公开(公告)日：2014-08-19

申请号：US13641239

申请日：2011-03-28

申请人： Kan Yasui ,  Harukazu Miyamoto ,  Masukazu Igarashi

发明人： Kan Yasui ,  Harukazu Miyamoto ,  Masukazu Igarashi

IPC分类号： G11B5/127

CPC分类号： G11B5/3146 ,  G11B5/1278 ,  G11B5/3116 ,  G11B5/314 ,  G11B5/315 ,  G11B2005/0024

摘要： A microwave-assisted magnetic recording system configured to perform magnetic recording with high density, including a high-frequency magnetic field generation element whose width is narrower than a track width of a main pole. A magnetic field vector from the main pole is perpendicularly incident on a film surface of the high-frequency magnetic field generating unit, by a shield material arranged to have a high magnetic permeability so that the main pole magnetic field is corrected and induced, and a hard bias layer to which a desired static magnetic field is added. Areas having high magnetic field gradients overlap each other by performing an offset of the high-frequency magnetic field generating unit of the magnetic head from the central line of the main pole.

摘要翻译： 一种被配置为执行高密度磁记录的微波辅助磁记录系统，包括宽度窄于主极的轨道宽度的高频磁场产生元件。 来自主极的磁场矢量垂直入射在高频磁场产生单元的膜表面上，通过屏蔽材料被布置成具有高导磁率，使得主极磁场被校正和感应，并且 添加了期望的静磁场的硬偏压层。 通过从主极的中心线执行磁头的高频磁场产生单元的偏移，具有高磁场梯度的区域彼此重叠。

公开(公告)号：US08687319B2

公开(公告)日：2014-04-01

申请号：US13404036

申请日：2012-02-24

申请人： Masukazu Igarashi ,  Masato Matsubara ,  Keiichi Nagasaka ,  Masato Shiimoto

发明人： Masukazu Igarashi ,  Masato Matsubara ,  Keiichi Nagasaka ,  Masato Shiimoto

IPC分类号： G11B5/127

CPC分类号： G11B5/1278 ,  G11B5/3146 ,  G11B2005/0024

摘要： A spin torque oscillator for microwave assisted recording includes a perpendicular free layer having a magnetic anisotropy axis in a direction perpendicular to a film surface, and an in-plane free layer composed of a magnetic film effectively having a magnetization easy plane on a film surface. When electric currents flows from the in-plane free layer side to the perpendicular free layer side, both free layers exchange spin information and thereby rotate their respective magnetizations almost antiparallel to each other and along a boundary surface with high-speed. Preferably, the perpendicular free layer is thinner than the in-plane free layer. It is also preferable that a magnetic anisotropy field of the perpendicular free layer attributable to materials should balance, in reverse directions, with an effective demagnetizing field in the perpendicular direction. Furthermore, the perpendicular free layer is preferably placed on the main pole side.

摘要翻译： 用于微波辅助记录的自旋扭矩振荡器包括在垂直于膜表面的方向上具有磁各向异性轴的垂直自由层，以及由在膜表面上具有易磁化平面的磁性膜构成的面内自由层。 当电流从平面内自由层侧流向垂直自由层侧时，两个自由层交换自旋信息，从而使它们各自的磁化几乎反平行并沿着边界表面高速旋转。 优选地，垂直自由层比平面内自由层薄。 由于材料的垂直自由层的磁各向异性场也优选在相反的方向上平衡，并且在垂直方向上具有有效的去磁场。 此外，垂直自由层优选放置在主极侧。

公开(公告)号：US20110216436A1

公开(公告)日：2011-09-08

申请号：US13128010

申请日：2009-11-10

申请人： Masukazu Igarashi ,  Harukazu Miyamoto

发明人： Masukazu Igarashi ,  Harukazu Miyamoto

IPC分类号： G11B15/12 ,  G11B5/127

CPC分类号： H01L43/08 ,  G11B5/314 ,  G11B2005/001 ,  G11B2005/0024 ,  H01L27/22

摘要： Excellent magnetization switching of a magnetic recording medium is promoted in microwave assisted magnetic recording to provide a highly-reliable high-density information recording device. A receded section from an air bearing surface is arranged at an end section in a write track width direction on an FGL laminate film for generating a high-frequency field. Alternatively, a cross section of the FGL laminate film (plane perpendicular to the direction of the flow of the electric current) has an inverted trapezoid shape or has a structure in which the area of the cross section increases with distance from the main pole. Since an excellent recording pattern is formed on the recording medium, areal recording density in the information recording device can be increased, and the reliability can be improved at the same time. As a result, the cost can be reduced.

摘要翻译： 在微波辅助磁记录中促进了磁记录介质的优异磁化切换，以提供高度可靠的高密度信息记录装置。 在用于产生高频场的FGL层压膜上，在空气轴承表面的后端部沿写入磁道宽度方向布置。 或者，FGL层叠膜的横截面（与电流的流动方向垂直的面）具有倒梯形形状，或者具有横截面积随着与主极的距离而增大的结构。 由于在记录介质上形成优良的记录图形，所以可以增加信息记录装置中的面密度，同时可以提高可靠性。 因此，可以降低成本。

公开(公告)号：US06728051B2

公开(公告)日：2004-04-27

申请号：US10388466

申请日：2003-03-17

申请人： Masukazu Igarashi ,  Yohji Maruyama ,  Kazuetsu Yoshida ,  Ikuo Saitoh

发明人： Masukazu Igarashi ,  Yohji Maruyama ,  Kazuetsu Yoshida ,  Ikuo Saitoh

IPC分类号： G11B509

CPC分类号： G11B20/10055 ,  G11B5/035 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/10194 ,  G11B20/14 ,  G11B2005/001 ,  G11B2005/0016 ,  G11B2020/10981

摘要： A recording equalizer for correcting a write timing of magnetic information when the magnetic information is recorded with a magnetic recording head on a magnetic recording medium, includes a buffer for storing a recording object bit and bits before and after the recording object bit and a calculator for calculating a precompensation parameter using the bits stored in the buffer. The calculator calculates the preconpensation parameter of the recording object bit by linearly adding influence of a transition existing at a two-previous bit of the recording object bit, influences of a transition at a one-previous bit of the recording object bit and influences of a transition existing at one-following bit of the recording object bit and further adding an offset. The offset is determined to a value such that a write timing of the magnetic information is corrected always in a delaying direction.

摘要翻译： 当在磁记录介质上用磁记录头记录磁信息时，用于校正磁信息的写定时的记录均衡器包括：用于存储记录对象位的缓冲器和记录对象位之前和之后的位;以及计算器， 使用存储在缓冲器中的位来计算预补偿参数。 计算器通过线性地添加存在于记录对象位的前两位的转变的影响，记录对象位的前一位的转变的影响和影响的影响来计算记录对象位的前置补偿参数 存在于记录对象位的一个后续位的转换，并进一步添加偏移。 偏移被确定为使得磁信息的写入定时总是以延迟方向校正的值。

公开(公告)号：US06671116B2

公开(公告)日：2003-12-30

申请号：US10044929

申请日：2002-01-15

申请人： Fumiko Akagi ,  Masukazu Igarashi ,  Kazuetsu Yoshida ,  Akira Ishikawa

发明人： Fumiko Akagi ,  Masukazu Igarashi ,  Kazuetsu Yoshida ,  Akira Ishikawa

IPC分类号： G11B502

CPC分类号： G11B5/012 ,  G11B5/64 ,  G11B5/82 ,  G11B2005/001

摘要： A magnetic recording system includes a magnetic recording medium including a magnetic layer, the magnetic layer being composed of magnetic grains, and a magnetic head including a recording unit and a reproducing unit. An orientation of an axis of easy magnetization of the magnetic grains is three-dimensionally distributed. An average angle between a direction of an axis of easy magnetization of each of the magnetic grains and a surface of the magnetic recording medium is within a range of 20° to 30°. A squareness ratio Mr/Ms of a remanent magnetization Mr of the magnetic recording medium to a saturation magnetization Ms of the magnetic recording medium is equal to 0.5 or more and is equal to 0.6 or less. A recording density of information which is recorded onto the magnetic recording medium is equal to 360 kfci or more.

公开(公告)号：US06549355B2

公开(公告)日：2003-04-15

申请号：US10231089

申请日：2002-08-30

申请人： Masukazu Igarashi ,  Yohji Maruyama ,  Kazuetsu Yoshida ,  Ikuo Saitoh

发明人： Masukazu Igarashi ,  Yohji Maruyama ,  Kazuetsu Yoshida ,  Ikuo Saitoh

IPC分类号： G11B509

CPC分类号： G11B20/10055 ,  G11B5/035 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/10194 ,  G11B20/14 ,  G11B2005/001 ,  G11B2005/0016 ,  G11B2020/10981

摘要： A recording equalizer for correcting a write timing of magnetic information when the magnetic information is recorded with a magnetic recording head on a magnetic recording medium, includes a buffer for storing a recording object bit and bits before and after the recording object bit and a calculator for calculating a precompensation parameter using the bits stored in the buffer. The calculator calculates the precompensation parameter of the recording object bit by linearly adding influence of a transition existing at a two-previous bit of the recording object bit, influences of a transition at a one-previous bit of the recording object bit and influences of a transition existing at one-following bit of the recording object bit and further adding an offset. The offset is determined to a value such that a write timing of the magnetic information is corrected always in a delaying direction.

摘要翻译： 当在磁记录介质上用磁记录头记录磁信息时，用于校正磁信息的写定时的记录均衡器包括：用于存储记录对象位的缓冲器和记录对象位之前和之后的位;以及计算器， 使用存储在缓冲器中的位来计算预补偿参数。 计算器通过线性地添加存在于记录对象位的两个先前位的转变的影响，记录对象位的前一位的转变的影响以及a的前一位的影响来计算记录对象位的预补偿参数 存在于记录对象位的一个后续位的转换，并进一步添加偏移。 偏移被确定为使得磁信息的写入定时总是以延迟方向校正的值。

公开(公告)号：US06487031B2

公开(公告)日：2002-11-26

申请号：US10079492

申请日：2002-02-22

申请人： Masukazu Igarashi ,  Yohji Maruyama ,  Kazuetsu Yoshida ,  Ikuo Saitoh

发明人： Masukazu Igarashi ,  Yohji Maruyama ,  Kazuetsu Yoshida ,  Ikuo Saitoh

IPC分类号： G11B509

CPC分类号： G11B20/10055 ,  G11B5/035 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/10194 ,  G11B20/14 ,  G11B2005/001 ,  G11B2005/0016 ,  G11B2020/10981

摘要： A recording equalizer for correcting a write timing of magnetic information when the magnetic information is recorded with a magnetic recording head on a magnetic recording medium, includes a buffer for storing a recording object bit and bits before and after the recording object bit and a calculator for calculating a precompensation parameter using the bits stored in the buffer. The calculator calculates the preconpensation parameter of the recording object bit by linearly adding influence of a transition existing at a two-previous bit of the recording object bit, influences of a transition at a one-previous bit of the recording object bit and influences of a transition existing at one-following bit of the recording object bit and further adding an offset. The offset is determined to a value such that a write timing of the magnetic information is corrected always in a delaying direction.

公开(公告)号：US06212024B1

公开(公告)日：2001-04-03

申请号：US09085860

申请日：1998-05-28

申请人： Masukazu Igarashi ,  Yohji Maruyama ,  Kazuetsu Yoshida ,  Ikuo Saitoh

发明人： Masukazu Igarashi ,  Yohji Maruyama ,  Kazuetsu Yoshida ,  Ikuo Saitoh

IPC分类号： G11B509

CPC分类号： G11B20/10055 ,  G11B5/035 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/10194 ,  G11B20/14 ,  G11B2005/001 ,  G11B2005/0016 ,  G11B2020/10981

摘要： A recording equalizer for precompensating of a write timing of magnetic information when the magnetic information is recorded by a magnetic recording head on a magnetic recording medium, includes a buffer for storing a recording object bit and bits before and after said recording object bit, and a calculator for calculating and outputting a precompensation parameter using the bits stored in the buffer by adding an offset C, having a value such as to always delay the write timing of the magnetic information, to an amount of shift determined using the bits stored in the buffer and the head velocity relative to the medium.

摘要翻译： 当在磁记录介质上由磁记录头记录磁信息时，用于对磁信息的写定时进行预补偿的记录均衡器包括用于存储记录对象位的缓冲器以及所述记录对象位之前和之后的位，以及 计算器，用于使用存储在缓冲器中的位来计算和输出预补偿参数，该偏移量具有将始终将磁信息的写入定时延迟的值的偏移量与使用存储在缓冲器中的位确定的移位量相加 和头部速度相对于介质。

公开(公告)号：US08760806B2

公开(公告)日：2014-06-24

申请号：US12990132

申请日：2009-04-21

申请人： Masukazu Igarashi ,  Harukazu Miyamoto

发明人： Masukazu Igarashi ,  Harukazu Miyamoto

IPC分类号： G11B5/127

CPC分类号： G11B5/64 ,  G11B5/314 ,  G11B2005/001 ,  G11B2005/0024

摘要： With respect to microwave assisted magnetic recording, high-density information recording is performed by forming a favorable write magnetic domain on a recording medium. The recording medium is placed in a magnetically resonant state by generating a microwave, and information is recorded. A recording medium 7 comprises parts 17 and 18 with differing magnetic anisotropy fields. Recording is performed using, for the frequency of the microwave, a frequency that places the part 17, which has smaller magnetic anisotropy, in a resonant state. Recording density of an information recording apparatus can be increased, while at the same time also improving reliability. Consequently, it becomes possible to reduce costs.

摘要翻译： 关于微波辅助磁记录，通过在记录介质上形成良好的写入磁畴来进行高密度信息记录。 通过产生微波将记录介质置于磁共振状态，并记录信息。 记录介质7包括具有不同磁各向异性场的部分17和18。 对于微波的频率，使具有较小磁各向异性的部分17放置在共振状态的频率进行记录。 可以增加信息记录装置的记录密度，同时也提高可靠性。 因此，可以降低成本。

公开(公告)号：US08724260B2

公开(公告)日：2014-05-13

申请号：US13128010

申请日：2009-11-10

申请人： Masukazu Igarashi ,  Harukazu Miyamoto

发明人： Masukazu Igarashi ,  Harukazu Miyamoto

IPC分类号： G11B5/31 ,  G11B5/235

CPC分类号： H01L43/08 ,  G11B5/314 ,  G11B2005/001 ,  G11B2005/0024 ,  H01L27/22

摘要： Excellent magnetization switching of a magnetic recording medium is promoted in microwave assisted magnetic recording to provide a highly-reliable high-density information recording device. A receded section from an air bearing surface is arranged at an end section in a write track width direction on an FGL laminate film for generating a high-frequency field. Alternatively, a cross section of the FGL laminate film (plane perpendicular to the direction of the flow of the electric current) has an inverted trapezoid shape or has a structure in which the area of the cross section increases with distance from the main pole. Since an excellent recording pattern is formed on the recording medium, areal recording density in the information recording device can be increased, and the reliability can be improved at the same time. As a result, the cost can be reduced.

摘要翻译： 在微波辅助磁记录中促进了磁记录介质的优异磁化切换，以提供高度可靠的高密度信息记录装置。 在用于产生高频场的FGL层压膜上，在空气轴承表面的后端部沿写入磁道宽度方向布置。 或者，FGL层叠膜的横截面（与电流的流动方向垂直的面）具有倒梯形形状，或者具有横截面积随着与主极的距离而增大的结构。 由于在记录介质上形成优良的记录图形，所以可以增加信息记录装置中的面密度，同时可以提高可靠性。 因此，可以降低成本。