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公开(公告)号：US07054106B2
公开(公告)日：2006-05-30
申请号：US10354989
申请日：2003-01-31
IPC分类号： G11B5/147
CPC分类号： B82Y25/00 , B82Y10/00 , G11B5/024 , G11B5/313 , G11B5/3156 , G11B5/3163 , G11B5/3967 , G11B5/465 , G11B2005/0008 , G11B2005/0013 , G11B2005/3996
摘要： Disclosed herein is a magnetic head for perpendicular recording in which the main magnetic pole has reduced remanent magnetization and is less liable to cause erasure after recording. These characteristic properties were realized by constructing the magnetic head such that the recording magnetic pole and the yoke are separate from each other and the main magnetic pole is formed from a material with a high saturation magnetic flux density and the yoke is formed from a material having a negative magnetostriction constant.
摘要翻译： 这里公开了一种用于垂直记录的磁头，其中主磁极具有降低的剩磁，并且在记录之后不易引起擦除。 这些特性是通过构造磁头来实现的，使得记录磁极和磁轭彼此分离，并且主磁极由具有高饱和磁通密度的材料形成，并且磁轭由具有 负磁致伸缩常数。
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12.发明授权Magnetic recording/reproducing device with a function of correcting waveform of magnetoresistive-effect head 失效具有校正磁阻效应头的波形功能的磁记录/重放装置
公开(公告)号：US5969896A
公开(公告)日：1999-10-19
申请号：US778761
申请日：1997-01-06
CPC分类号： G11B5/012 , B82Y10/00 , B82Y25/00 , G11B5/02 , G11B5/465 , G11B2005/0008 , G11B2005/001 , G11B2005/0016 , G11B2005/3996
摘要： A magnetic recording/reproducing device has an inductive write element provided with a coil and magnetic cores for recording information on a medium, a magnetoresistive read element for transducing a change in a magnetic field leaking from a medium, on which information is recorded, into an electrical signal, a detector for detecting an output signal of the read element, a bias field applying unit for applying a bias field to the read element, and a recording/reproducing operation controller for reproducing information based on an output signal from the read element and for controlling the recording current applying unit based on an inputted signal to record information. The recording/reproducing operation control unit has a stabilizing unit for controlling the bias field applying unit to make an absolute value of the bias field in a state where a magnetic field leaking from the medium is applied to the read element larger than that during a normal reproducing operation.
摘要翻译： 磁记录/再现装置具有设置有线圈的感应写入元件和用于在介质上记录信息的磁芯，用于将从记录有信息的介质泄漏的磁场的变化转换成磁阻读取元件的磁阻读取元件 电信号，用于检测读取元件的输出信号的检测器，用于向读取元件施加偏置场的偏置场施加单元，以及用于基于来自读取元件的输出信号再现信息的记录/再现操作控制器，以及 用于基于输入的信号控制记录电流施加单元以记录信息。 记录/再现操作控制单元具有稳定单元，用于控制偏置场施加单元，以使得从介质泄漏的磁场到读取元件的状态中的偏置场的绝对值大于正常情况下的偏移场的绝对值 再现操作。
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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.
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14.发明申请Thin film perpendicular magnetic recording head, their fabrication process and magnetic disk drive using it 失效薄膜垂直磁记录头，其制造工艺和使用它的磁盘驱动器公开(公告)号：US20070217066A1
公开(公告)日：2007-09-20
申请号：US11802297
申请日：2007-05-22
IPC分类号： G11B5/127
CPC分类号： G11B5/3906 , G11B5/1278
摘要： Thin film perpendicular magnetic head with a narrow main pole capable of a high recording density in excess of 100 gigabits per square inch and generating a high magnetic recording field exceeding 10 kOe (oersted), while also modified to suppress remanent magnetic fields occurring immediately after writing operation. In a perpendicular magnetic head comprising a main pole, a return path for supplying a magnetic flux to that main pole, and an conductive coil for excitation of the main pole and return path, the main pole has a pole width of 200 nanometers or less, and a magnetic multilayer made up of a high saturation flux density layer and low saturation flux density layer, the low saturation flux density layer has a thickness within 0.5 to 5 nanometers, the high saturation flux density layer has a thickness from 10 to 50 nanometers for suppressing remanent magnetization and preventing erasing after writing by utilizing a closed magnetic domain structure in the pole.
摘要翻译： 具有超过100吉比特/平方英寸的高记录密度的窄主极的薄膜垂直磁头，并产生超过10kOe（奥斯特）的高磁记录场，同时还被修改以抑制写入后立即发生的残留磁场 操作。 在包括主极，用于向该主极提供磁通的返回路径和用于激励主极返回路径的导电线圈的垂直磁头中，主极的极宽为200纳米以下， 以及由高饱和磁通密度层和低饱和磁通密度层组成的磁性层，低饱和磁通密度层的厚度在0.5〜5纳米之间，高饱和磁通密度层的厚度为10〜50纳米， 通过利用极中的闭合磁畴结构来抑制剩磁，并防止写入后的擦除。
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15.发明申请公开(公告)号：US20070002492A1
公开(公告)日：2007-01-04
申请号：US11517468
申请日：2006-09-08
IPC分类号： G11B5/127
CPC分类号： G11B5/3967 , G11B5/09 , G11B5/1278 , G11B5/187 , G11B5/313 , G11B2005/0029
摘要： There is provided a perpendicular magnetic recording and reproducing system in which the overwrite erase ratio of a perpendicular magnetic head has been improved to prevent the deterioration of an overwrite property. In the perpendicular magnetic head, a third magnetic pole composed of a soft magnetic layer is formed on the leading side of a recording magnetic pole via a non-magnetic layer, thereby reducing magnetic interference from magnetization on a medium with the recording magnetic pole and preventing the deterioration of the overwrite property.
摘要翻译： 提供了一种垂直磁记录和再现系统，其中改进了垂直磁头的重写擦除比以防止覆盖性能的劣化。 在垂直磁头中，通过非磁性层在记录磁极的前端形成由软磁性层构成的第三磁极，从而减少了具有记录磁极的介质上的磁化的磁干扰，并防止 覆盖属性的恶化。
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公开(公告)号：US06507465B1
公开(公告)日：2003-01-14
申请号：US09679416
申请日：2000-10-04
申请人： Kazuhiro Nakamoto , Yoshiaki Kawato
发明人： Kazuhiro Nakamoto , Yoshiaki Kawato
IPC分类号： G11B539
CPC分类号： B82Y25/00 , B82Y10/00 , G11B5/3903 , G11B5/3932 , G11B5/399 , G11B2005/3996
摘要： A magnetic head includes a magnetoresistive effect film and a pair of electrodes contacting the magnetoresistive effect film such that the electrodes overlap the magnetoresistive effect film. The magnetoresistive effect film includes a first ferromagnetic film having a direction of magnetization which is changeable, an antiferromagnetic film, a second ferromagnetic film having a direction of magnetization which is fixed by the antiferromagnetic film, and a non-magnetic conductive film disposed between the first ferromagnetic film and the second ferromagnetic film.
摘要翻译： 磁头包括磁阻效应膜和与磁阻效应膜接触的一对电极，使得电极与磁阻效应膜重叠。 磁阻效应膜包括具有可变化的磁化方向的第一铁磁膜，反铁磁膜，具有由反铁磁膜固定的磁化方向的第二铁磁膜和设置在第一与第二铁磁膜之间的非磁性导电膜 铁磁膜和第二铁磁膜。
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17.发明授权Thin film perpendicular magnetic recording head, their fabrication process and magnetic disk drive using it 有权薄膜垂直磁记录头，其制造工艺和使用它的磁盘驱动器公开(公告)号：US08085499B2
公开(公告)日：2011-12-27
申请号：US12888621
申请日：2010-09-23
CPC分类号： G11B5/3906 , G11B5/1278
摘要： Thin film perpendicular magnetic head with a narrow main pole capable of a high recording density in excess of 100 gigabits per square inch and generating a high magnetic recording field, while also being modified to suppress remanent magnetic fields occurring immediately after writing operation. A return path is provided for supplying a magnetic flux to the main pole, and an conductive coil for excitation of the main pole and return path. The main pole has a pole width of 200 nanometers or less, and a magnetic multilayer made up of a high saturation flux density layer and low saturation flux density layer. The low saturation flux density layer and the high saturation flux density suppress remanent magnetization and prevent erasing after writing by utilizing a closed magnetic domain structure in the pole.
摘要翻译： 具有超过100吉比特/平方英寸的高记录密度的窄主极的薄膜垂直磁头，并产生高磁记录场，同时还进行修改以抑制在写入操作之后立即发生的剩余磁场。 提供用于向主极提供磁通量的返回路径和用于激励主极和返回路径的导电线圈。 主极的极宽为200nm以下，由高饱和磁通密度层和低饱和磁通密度层构成的磁性层叠体。 低饱和磁通密度层和高饱和磁通密度通过利用磁极中的闭合磁畴结构来抑制剩磁，并防止写入后的擦除。
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18.发明授权Thin film perpendicular magnetic recording head, their fabrication process and magnetic disk drive using it 失效薄膜垂直磁记录头，其制造工艺和使用它的磁盘驱动器公开(公告)号：US07221538B2
公开(公告)日：2007-05-22
申请号：US10644022
申请日：2003-08-20
CPC分类号： G11B5/3906 , G11B5/1278
摘要： Thin film perpendicular magnetic head with a narrow main pole capable of a high recording density in excess of 100 gigabits per square inch and generating a high magnetic recording field exceeding 10 kOe while suppressing remanent magnetic fields occurring immediately after write operations. The perpendicular magnetic head comprises a main pole, a return path for supplying a magnetic flux to that main pole, and a conductive coil for excitation of the main pole and return path. The main pole has a pole width of 200 nanometers or less, and a magnetic multilayer made up of a high saturation flux density layer and low saturation flux density layer. The low saturation flux density layer has a thickness within 0.5 to 5 nanometers, and The high saturation flux density layer has a thickness from 10 to 50.
摘要翻译： 具有能够记录密度高达100吉比特/平方英寸的窄主磁极的薄膜垂直磁头，并且在写入操作之后立即产生高磁记录场超过10kOe，同时抑制残留的磁场。 垂直磁头包括主极，用于向该主极提供磁通的返回路径和用于激励主极和返回路径的导电线圈。 主极的极宽为200nm以下，由高饱和磁通密度层和低饱和磁通密度层构成的磁性层叠体。 低饱和磁通密度层的厚度为0.5〜5纳米，高饱和磁通密度层的厚度为10〜50。
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公开(公告)号：US6141190A
公开(公告)日：2000-10-31
申请号：US333005
申请日：1999-06-15
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.
摘要翻译： 即使电极间隔较小，也可以独立于磁畴控制层的强度而产生高再现输出的磁阻效应头，并且提供使用其的磁记录和再现装置。 磁阻效应膜由第一铁磁膜，非磁性导电膜和第二铁磁膜的堆叠层形成。 第二铁磁膜堆叠在反铁磁膜上，并且磁畴控制层布置在磁阻效应膜的宽度方向的相对侧上。 在每个磁畴控制层上布置一对电极，其电极间距小于磁阻效应膜的宽度，使得电流仅在磁阻效应膜的中心区域中流动。
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20.发明申请ANGLE SENSOR, ANGLE SENSOR MANUFACTURING METHOD, AND ANGLE DETECTION DEVICE USING THE ANGLE SENSOR 有权角度传感器，角度传感器制造方法和使用角度传感器的角度检测装置公开(公告)号：US20100327857A1
公开(公告)日：2010-12-30
申请号：US12864997
申请日：2008-12-03
IPC分类号： G01B7/30
CPC分类号： G01R33/093 , B82Y25/00 , G01R33/098
摘要： There is provided an angle sensor and angle detection device of high output and high accuracy with a wide operating temperature range. First through eighth sensor units 511, 522, 523, 514, 531, 542, 543 and 534 are produced from spin valve magnetoresistive films that use a self-pinned type ferromagnetic pinned layer comprising two layers of ferromagnetic films that are strongly and anti-ferromagnetically coupled. The respective sensor units are produced via the formation and patterning of thin-films magnetized at angles that differ by 90°, and the formation of insulation films. By using, for the ferromagnetic films, CoFe and FeCo films that have similar Curie temperatures to make the difference in magnetization amount be zero, high immunity to external magnetic fields, a broad adaptive temperature range, and high output are realized.
摘要翻译： 在宽工作温度范围内提供高输出和高精度的角度传感器和角度检测装置。 第一至第八传感器单元511,522,543,514,531,542,543和534由自旋阀磁阻膜制造，该自旋阀磁阻膜使用包括两层强磁性和反铁磁性的铁磁性薄膜的自固定型铁磁性钉扎层 耦合。 相应的传感器单元通过以不同于90°的角度磁化的薄膜的形成和图案化以及形成绝缘膜来制造。 通过对铁磁膜使用具有相似居里温度的CoFe和FeCo膜，使磁化强度的差异为零，实现了对外部磁场的高抗扰性，宽适应温度范围和高输出。
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