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公开(公告)号：US08300346B2
公开(公告)日：2012-10-30
申请号：US12750870
申请日：2010-03-31
申请人： Hiroshi Ikeda , Isamu Sato , Kiyoshi Noguchi , Tsutomu Aoyama , Takuya Adachi
发明人： Hiroshi Ikeda , Isamu Sato , Kiyoshi Noguchi , Tsutomu Aoyama , Takuya Adachi
CPC分类号： G11B5/314 , G11B5/1278 , G11B2005/0024
摘要： A gap between a main pole and auxiliary pole composing a thin film magnetic head having a microwave assisted function of the present invention is filled with a nonmagnetic dielectric layer to embed a microwave radiator. The nonmagnetic dielectric layer has an inclined surface at a end on a side of an opposing medium surface by which the microwave radiated from the microwave radiator to be bent toward the main pole, whereby the microwave magnetic field generated from the microwave generator can be gathered immediately below the main pole, further improving the microwave assisted effect.
摘要翻译： 构成本发明的具有微波辅助功能的薄膜磁头的主极和辅助极之间的间隙填充有非磁性介电层以嵌入微波辐射器。 非磁性介电层在相对的介质表面的一侧的端部具有倾斜表面，微波从微波辐射器辐射到微波辐射器，从而微波发生器产生的微波磁场可以立即收集 主杆下方进一步提高微波辅助效果。
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公开(公告)号：US20110242696A1
公开(公告)日：2011-10-06
申请号：US12750870
申请日：2010-03-31
申请人： Hiroshi IKEDA , Isamu Sato , Kiyoshi Noguchi , Tsutomu Aoyama , Takuya Adachi
发明人： Hiroshi IKEDA , Isamu Sato , Kiyoshi Noguchi , Tsutomu Aoyama , Takuya Adachi
IPC分类号： G11B5/02
CPC分类号： G11B5/314 , G11B5/1278 , G11B2005/0024
摘要： A gap between a main pole and auxiliary pole composing a thin film magnetic head having a microwave assisted function of the present invention is filled with a nonmagnetic dielectric layer to embed a microwave radiator. The nonmagnetic dielectric layer has an inclined surface at a end on a side of an opposing medium surface by which the microwave radiated from the microwave radiator to be bent toward the main pole, whereby the microwave magnetic field generated from the microwave generator can be gathered immediately below the main pole, further improving the microwave assisted effect.
摘要翻译： 构成本发明的具有微波辅助功能的薄膜磁头的主极和辅助极之间的间隙填充有非磁性介电层以嵌入微波辐射器。 非磁性介电层在相对的介质表面的一侧的端部具有倾斜表面，微波从微波辐射器辐射到微波辐射器，从而微波发生器产生的微波磁场可以立即收集 主杆下方进一步提高微波辅助效果。
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公开(公告)号：US20120230167A1
公开(公告)日：2012-09-13
申请号：US13045603
申请日：2011-03-11
IPC分类号： G11B13/04
CPC分类号： G11B5/314 , G11B5/1278 , G11B2005/0024
摘要： A microwave assisted magnetic head of the present invention includes: at least two or more auxiliary coils that are arranged in a periphery of a writing main pole; and microwave current supply means that applies microwave currents to the at least two or more auxiliary coils. The at least two or more auxiliary coils respectively include linear body parts linearly arranged on an ABS side, two of the linear body parts of the at least two or more auxiliary coils are arranged in a substantially orthogonal positional relationship, and the microwave current supply means is configured such that the microwave current supply means changes phase differences of the microwave currents applied respectively to the at least two or more auxiliary coils. Therefore, the microwave current can be easily controlled, and thus, a circularly polarized magnetic field with high magnetization inversion efficiency can be generated as an assistance magnetic field.
摘要翻译： 本发明的微波辅助磁头包括：布置在书写主极的周边中的至少两个或更多个辅助线圈; 以及微波电流供给装置，其向所述至少两个或更多个辅助线圈施加微波电流。 所述至少两个以上的辅助线圈分别包括直线状配置在ABS侧的线状体部，所述至少两个以上的辅助线圈的线状体部的两个以大致正交的位置关系配置，微波电流供给装置 被配置为使得微波电流提供装置改变分别施加到至少两个或更多个辅助线圈的微波电流的相位差。 因此，可以容易地控制微波电流，因此可以产生具有高磁化反转效率的圆极化磁场作为辅助磁场。
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公开(公告)号：US08264916B1
公开(公告)日：2012-09-11
申请号：US13045603
申请日：2011-03-11
CPC分类号： G11B5/314 , G11B5/1278 , G11B2005/0024
摘要： A microwave assisted magnetic head of the present invention includes: at least two or more auxiliary coils that are arranged in a periphery of a writing main pole; and microwave current supply means that applies microwave currents to the at least two or more auxiliary coils. The at least two or more auxiliary coils respectively include linear body parts linearly arranged on an ABS side, two of the linear body parts of the at least two or more auxiliary coils are arranged in a substantially orthogonal positional relationship, and the microwave current supply means is configured such that the microwave current supply means changes phase differences of the microwave currents applied respectively to the at least two or more auxiliary coils. Therefore, the microwave current can be easily controlled, and thus, a circularly polarized magnetic field with high magnetization inversion efficiency can be generated as an assistance magnetic field.
摘要翻译： 本发明的微波辅助磁头包括：布置在书写主极的周边中的至少两个或更多个辅助线圈; 以及微波电流供给装置，其向所述至少两个或更多个辅助线圈施加微波电流。 所述至少两个以上的辅助线圈分别包括直线状配置在ABS侧的线状体部，所述至少两个以上的辅助线圈的线状体部的两个以大致正交的位置关系配置，微波电流供给装置 被配置为使得微波电流提供装置改变分别施加到至少两个或更多个辅助线圈的微波电流的相位差。 因此，可以容易地控制微波电流，因此可以产生具有高磁化反转效率的圆极化磁场作为辅助磁场。
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公开(公告)号：US08107352B1
公开(公告)日：2012-01-31
申请号：US12852775
申请日：2010-08-09
申请人： Noboru Yamanaka , Takuya Adachi , Isamu Sato , Hiroshi Ikeda
发明人： Noboru Yamanaka , Takuya Adachi , Isamu Sato , Hiroshi Ikeda
CPC分类号： G11B5/314 , G11B5/1278 , G11B2005/0024
摘要： A microwave assisted magnetic head is formed to include a main pole magnetic layer including a main pole; a shielded magnetic layer including a shielded pole; a recording coil that is formed to generate a writing magnetic field from a tip of the main pole; and a microwave radiation waveguide made of a conductive nonmagnetic material that is disposed in a recording gap, the recording gap being a gap between the main pole and the shielded pole. The main pole magnetic layer and the shielded magnetic layer have an intermediate connection part that connects the layers at a depth-side, and an electrical insulation magnetic film is disposed in the intermediate connection part, and the main pole and the shielded pole are electrically connected with the microwave radiation waveguide that is disposed in the recording gap, which is the gap between the main pole and the shielded pole so that a simple configuration, with a relatively easy and efficient manufacturing process, is realized that overlaps AC magnetic fields in an in-plane direction of a microwave band, which is the same as, or close to, a ferromagnetic resonant frequency of a medium recording layer.
摘要翻译： 微波辅助磁头形成为包括主极的主极磁性层; 包括屏蔽极的屏蔽磁性层; 形成为从主极的尖端产生书写磁场的记录线圈; 以及设置在记录间隙中的由导电非磁性材料制成的微波辐射波导，记录间隙是主极和屏蔽极之间的间隙。 主极磁性层和屏蔽磁性层具有在深度侧连接层的中间连接部，并且在中间连接部中设置电绝缘性的磁性膜，并且主极和屏蔽极电气连接 利用布置在作为主极和屏蔽极之间的间隙的记录间隙中的微波辐射波导，从而实现了具有相对简单和有效的制造工艺的简单配置，其与交流磁场重叠， 与介质记录层的铁磁谐振频率相同或接近的微波频带的平面方向。
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公开(公告)号：US08547655B2
公开(公告)日：2013-10-01
申请号：US13297377
申请日：2011-11-16
申请人： Tsutomu Aoyama , Hiroshi Ikeda , Isamu Sato
发明人： Tsutomu Aoyama , Hiroshi Ikeda , Isamu Sato
IPC分类号： G11B5/02
CPC分类号： G11B5/3133 , G11B2005/0024
摘要： A magnetic recording method for a recording layer of a magnetic recording medium uses a thin film magnetic head with a sub-coil or a microwave radiator. In the method, a microwave spread spectrum (SS) signal is applied to the sub-coil or the microwave radiator, the microwave SS signal including a ferromagnetic resonant (FMR) frequency of the recording layer as a carrier wave within a band so as to generate an in-plane high-frequency magnetic field so that a magnetization reversal magnetic field Hsw of the recording layer is lowered. The magnetic recording is performed while the magnetization reversal magnetic field Hsw of the recording layer is lowered.
摘要翻译： 用于磁记录介质的记录层的磁记录方法使用具有子线圈或微波辐射器的薄膜磁头。 在该方法中，微波扩频（SS）信号施加到子线圈或微波辐射器，微波SS信号包括记录层的铁磁共振（FMR）频率作为频带内的载波，以便 产生平面内的高频磁场，使得记录层的磁化反转磁场Hsw降低。 在记录层的磁化反转磁场Hsw降低的同时进行磁记录。
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公开(公告)号：US08027110B1
公开(公告)日：2011-09-27
申请号：US12844348
申请日：2010-07-27
申请人： Noboru Yamanaka , Tomoyuki Sasaki , Takuya Adachi , Isamu Sato , Hiroshi Ikeda
发明人： Noboru Yamanaka , Tomoyuki Sasaki , Takuya Adachi , Isamu Sato , Hiroshi Ikeda
IPC分类号： G11B27/36
CPC分类号： G01R33/091 , G11B5/314 , G11B2005/0024
摘要： A measurement circuit system of a magnetic field measurement apparatus of the present invention includes an amplifier, a mixer circuit and a band-pass filter that are connected in order on an output end side of a microstrip line or a coplanar wave guide, which is an in-plane high frequency magnetic field intensity measurement element, a frequency immediately before being inputted in the band-pass filter is down-converted by the mixer circuit to a frequency so that a band width of the band-pass filter can be used, the band-pass filter uses a narrow band of ±0.5-±10 KHz (1 KHz-20 KHz as a bandwidth) centering a fundamental frequency selected from 5-20 MHz that is down-converted by the mixer circuit as a center peak passing frequency, and the measurement circuit system is configured to obtain 3 dB or greater of a signal-to-noise ratio (SNR) that is a ratio of S with N; where S represents the reproduction voltage (reproduction output) of the high frequency reproduction signal induced by the in-plane high frequency magnetic field intensity measurement element, and N represents a total noise voltage of a circuit noise including a noise generated by the in-plane high frequency magnetic field intensity measurement element. Therefore, the in-plane high frequency magnetic field that a microwave-assisted magnetic head generates can be measured with high reliability and precision.
摘要翻译： 本发明的磁场测量装置的测量电路系统包括在微带线或共面波导的输出端侧依次连接的放大器，混频器电路和带通滤波器，它是 在平面内的高频磁场强度测量元件中，紧接在带通滤波器中输入的频率由混频器电路下变频到频率，使得可以使用带通滤波器的带宽， 带通滤波器采用±0.5〜10KHz（1KHz-20KHz作为带宽）的中心峰值通过频率，该频带以选择5-20MHz的基频为中心，由频率调制器电路进行下变频 并且测量电路系统被配置为获得S与N的比率的3dB或更大的信噪比（SNR）; 其中S表示由面内高频磁场强度测量元件感应的高频再现信号的再现电压（再现输出），N表示包括由平面内高频磁场强度测量元件产生的噪声的电路噪声的总噪声电压 高频磁场强度测量元件。 因此，可以高可靠性和精度地测量微波辅助磁头产生的平面内高频磁场。
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公开(公告)号：US20110222185A1
公开(公告)日：2011-09-15
申请号：US12721034
申请日：2010-03-10
申请人： Tetsuya Roppongi , Takuya Adachi , Isamu Sato , Hiroshi Ikeda , Mikio Matsuzaki
发明人： Tetsuya Roppongi , Takuya Adachi , Isamu Sato , Hiroshi Ikeda , Mikio Matsuzaki
IPC分类号： G11B5/02
CPC分类号： G11B5/1278 , G11B2005/001 , G11B2005/0024
摘要： A magnetic recording apparatus includes a magnetic recording medium having a magnetic recording layer, a thin-film magnetic head with a microwave-band magnetic drive function, the head having a write field generation means that generates a write field to the magnetic recording medium in response to a write signal, and a microwave generator that is provided independent of the write field generation means and generates an alternating magnetic field in plane having a microwave-band frequency when microwave-excitation current is fed, an excitation current generation means that generates the microwave-excitation current by amplitude-modulating microwave carrier current with a modulating signal having a fixed period, and a write signal supply means that generates the write signal and applies it to the write field generation means of the thin-film magnetic head.
摘要翻译： 磁记录装置包括具有磁记录层的磁记录介质，具有微波带磁驱动功能的薄膜磁头，该磁头具有写磁场产生装置，以响应于该磁场记录介质产生写磁场 写入信号，和独立于写入场产生装置提供的微波发生器，并且当馈送微波激励电流时产生具有微波频带频率的平面中的交变磁场;产生微波的激励电流产生装置 - 具有固定周期的调制信号的幅度调制微波载波电流的激励电流;以及产生写入信号并将其施加到薄膜磁头的写入场发生装置的写入信号提供装置。
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公开(公告)号：US20120033534A1
公开(公告)日：2012-02-09
申请号：US12852775
申请日：2010-08-09
申请人： Noboru YAMANAKA , Takuya Adachi , Isamu Sato , Hiroshi Ikeda
发明人： Noboru YAMANAKA , Takuya Adachi , Isamu Sato , Hiroshi Ikeda
IPC分类号： G11B11/00
CPC分类号： G11B5/314 , G11B5/1278 , G11B2005/0024
摘要： A microwave assisted magnetic head is formed to include a main pole magnetic layer including a main pole; a shielded magnetic layer including a shielded pole; a recording coil that is formed to generate a writing magnetic field from a tip of the main pole; and a microwave radiation waveguide made of a conductive nonmagnetic material that is disposed in a recording gap, the recording gap being a gap between the main pole and the shielded pole. The main pole magnetic layer and the shielded magnetic layer have an intermediate connection part that connects the layers at a depth-side, and an electrical insulation magnetic film is disposed in the intermediate connection part, and the main pole and the shielded pole are electrically connected with the microwave radiation waveguide that is disposed in the recording gap, which is the gap between the main pole and the shielded pole so that a simple configuration, with a relatively easy and efficient manufacturing process, is realized that overlaps AC magnetic fields in an in-plane direction of a microwave band, which is the same as, or close to, a ferromagnetic resonant frequency of a medium recording layer.
摘要翻译： 微波辅助磁头形成为包括主极的主极磁性层; 包括屏蔽极的屏蔽磁性层; 形成为从主极的尖端产生书写磁场的记录线圈; 以及设置在记录间隙中的由导电非磁性材料制成的微波辐射波导，记录间隙是主极和屏蔽极之间的间隙。 主极磁性层和屏蔽磁性层具有在深度侧连接层的中间连接部，并且在中间连接部中设置电绝缘性的磁性膜，并且主极和屏蔽极电气连接 利用布置在作为主极和屏蔽极之间的间隙的记录间隙中的微波辐射波导，从而实现了具有相对简单和有效的制造工艺的简单配置，其与交流磁场重叠， 与介质记录层的铁磁谐振频率相同或接近的微波频带的平面方向。
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公开(公告)号：US08358127B2
公开(公告)日：2013-01-22
申请号：US12755803
申请日：2010-04-07
申请人： Isamu Sato , Hiroshi Ikeda , Mikio Matsuzaki , Tetsuya Roppongi , Noboru Yamanaka , Tsutomu Aoyama
发明人： Isamu Sato , Hiroshi Ikeda , Mikio Matsuzaki , Tetsuya Roppongi , Noboru Yamanaka , Tsutomu Aoyama
IPC分类号： G01R33/02
CPC分类号： G11B5/455 , G01R33/098 , G01R33/1284
摘要： A measuring circuit system in a magnetic field measuring apparatus of the invention has an amplifier and a band-pass filter connected in sequence on an output terminal side of the TMR element, the band-pass filter is a narrow-range band-pass filter such that a peak pass frequency of the filter that is a center is a basic frequency selected from a range of 10 to 40 GHz and a band width centered around the basic frequency is a narrow range of ±0.5 to ±4 GHz; and with the measuring circuit system, an SIN ratio (SNR) of 3 dB or greater is obtained, the SNR being defined by a ratio of an amplitude S of a high-frequency generated signal induced by the TMR element to a total noise N that is a sum of a head noise generated by the TMR element and a circuit noise generated by the amplifier. With such a configuration, an in-plane high-frequency magnetic field generated by a microwave-assisted magnetic head is reliably and precisely measured.
摘要翻译： 本发明的磁场测量装置中的测量电路系统具有在TMR元件的输出端侧依次连接的放大器和带通滤波器，带通滤波器是窄范围带通滤波器， 作为中心的滤波器的峰值通过频率是从10〜40GHz的范围选择的基本频率，以基本频率为中心的带宽为±0.5〜±4GHz的窄范围; 并且利用测量电路系统，获得3dB或更大的SIN比（SNR），SNR由TMR元件引起的高频产生信号的振幅S与总噪声N的比值定义， 是由TMR元件产生的头噪声和由放大器产生的电路噪声的总和。 通过这样的结构，可以可靠且精确地测量由微波辅助磁头产生的面内高频磁场。
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