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    Magnetic recording medium
    45.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4599280A

    公开(公告)日：1986-07-08

    申请号：US603668

    申请日：1984-04-25

    申请人： Toshiaki Izumi ,  Kiyoshi Noguchi ,  Misao Kohmoto

    发明人： Toshiaki Izumi ,  Kiyoshi Noguchi ,  Misao Kohmoto

    IPC分类号： G11B5/85 ,  G11B5/64

    CPC分类号： G11B5/85 ,  Y10S428/90

    摘要： In a magnetic recording medium comprising a length of a non-magnetic plastic substrate and a magnetic thin layer of Co or Co-Ni or Co-Ni-Cr formed thereon, when the coercive force of the medium is measured by changing the measuring direction in a plane defined by a longitudinal direction of the substrate and a direction normal to the major surface of the substrate, the following relationship is met:(Hc.sub.max -Hc.sub.min)/Hc(0).ltoreq.0.9where Hc.sub.max is the maximum coercive force, Hc.sub.min is the minimum coercive force, and Hc(0) is a coercive force in the longitudinal direction of the substrate.

    摘要翻译： 在包含一定长度的非磁性塑料基板和其上形成有Co或Co-Ni或Co-Ni-Cr的磁性薄层的磁记录介质中，当通过改变介质的测量方向来测量介质的矫顽力时 由基板的纵向和垂直于基板的主表面的方向限定的平面，满足以下关系：（Hcmax-Hcmin）/ Hc（0）

    Thin-Film Magnetic Head Having Microwave Magnetic Exciting Function and Magnetic Recording and Reproducing Apparatus
    48.
    发明申请
    Thin-Film Magnetic Head Having Microwave Magnetic Exciting Function and Magnetic Recording and Reproducing Apparatus 有权
    具有微波激磁功能和磁记录和再现装置的薄膜磁头

    公开(公告)号：US20100208379A1

    公开(公告)日：2010-08-19

    申请号：US12700278

    申请日：2010-02-04

    申请人： Hiroshi Ikeda ,  Sayaka Hattori ,  Kiyoshi Noguchi

    发明人： Hiroshi Ikeda ,  Sayaka Hattori ,  Kiyoshi Noguchi

    IPC分类号： G11B5/02

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

    摘要： A thin-film magnetic head having microwave magnetic exciting function, includes a write magnetic field production unit for producing, in response to a write signal, a write magnetic field to be applied into a magnetic recording medium, a line conductor of a microwave radiator of a plane-structure type, formed independent from the write magnetic field production means, for radiating, by feeding there through a microwave excitation current, a microwave band resonance magnetic field with a frequency equal to or in a range near a ferromagnetic resonance frequency FR of the magnetic recording medium, and two conductors separated from the line conductor in a direction perpendicular to a track-width direction of the thin-film magnetic head and parallel to an ABS of the thin-film magnetic head. The microwave radiator is an inverted micro strip waveguide having the line conductor and a ground conductor constituted by the magnetic recording medium. A section of the line conductor, perpendicular to the track-width direction has a rectangular shape. An aspect ratio B/A is within a region from 0.15 to 1.2 or within a region of 7 or more, where A is a length in a lateral direction of the line conductor, which is in parallel with the ABS and perpendicular to the track-width direction, and B is a length in a longitudinal direction of the line conductor, which is perpendicular to the air bearing surface.

    摘要翻译： 一种具有微波磁激励功能的薄膜磁头，包括写入磁场产生单元，用于响应于写入信号，产生要施加到磁记录介质中的写入磁场，微波辐射器的线路导体 平面结构类型，独立于写入磁场产生装置形成，用于通过微波激励电流向其馈送频率等于或接近铁磁谐振频率FR的频率的微波频带共振磁场 磁记录介质和两条导体，它们在垂直于薄膜磁头的磁道宽度方向的方向上与线路导体分离，并平行于薄膜磁头的ABS。 微波辐射器是具有线路导体和由磁记录介质构成的接地导体的倒置微带波导。 垂直于轨道宽度方向的线路导体的一部分具有矩形形状。 纵横比B / A在0.15至1.2的范围内或在7或更大的区域内，其中A是线路导体的横向方向上的长度，其与ABS平行并垂直于轨道 - 宽度方向，B是与空气轴承面垂直的线状导体的长度方向的长度。

    Examination method for CPP-type magnetoresistance effect element having two free layers
    49.
    发明授权
    Examination method for CPP-type magnetoresistance effect element having two free layers 有权
    具有两个自由层的CPP型磁阻效应元件的检查方法

    公开(公告)号：US07615996B1

    公开(公告)日：2009-11-10

    申请号：US12320152

    申请日：2009-01-21

    申请人： Takahiko Machita ,  Kiyoshi Noguchi ,  Daisuke Miyauchi

    发明人： Takahiko Machita ,  Kiyoshi Noguchi ,  Daisuke Miyauchi

    IPC分类号： G01R33/09 ,  G11B5/39

    CPC分类号： G01R33/093 ,  B82Y25/00 ,  G01R33/098 ,  G11B5/3912 ,  G11B5/455 ,  G11B2005/0016 ,  Y10T428/1121

    摘要： An examination method is structured, with respect to a magnetization direction of an orthogonalizing bias function part formed on a posterior part of an magnetoresistance (MR) effect element, of changing the magnetization direction of the orthogonalizing bias function part between a first magnetization forming mode, wherein the magnetization direction is from the anterior side of the element to the posterior side thereof, and a second magnetization forming mode, wherein the magnetization direction is from the posterior side of the element to the anterior side thereof, measuring the output waveform of the element in response to an external magnetic field for each magnetization forming mode and checking the state of the output waveforms of both modes in order to examine whether or not the magnetization directions of the first magnetic layer and the second magnetic layer, both of which functions as free layers, are antiparallel to each other in the track width direction before the orthogonalizing bias function part starts functioning. With the structure, it is realized to easily examine whether or not the magnetization directions of two free layers have surely been made antiparallel to each other before operating the orthogonalizing bias function part of an element.

    摘要翻译： 对于形成在磁阻（MR）效应元件的后部的正交偏置功能部分的磁化方向，在第一磁化形成模式，第一磁化形成模式和第二磁化形成模式之间改变正交偏置功能部分的磁化方向， 其中所述磁化方向从所述元件的前侧到其后侧，以及第二磁化形成模式，其中所述磁化方向从所述元件的后侧到其前侧，测量所述元件的输出波形 响应于每个磁化形成模式的外部磁场，并且检查两种模式的输出波形的状态，以便检查第一磁性层和第二磁性层的磁化方向是否起免费作用 在正交之前在轨道宽度方向上彼此反平行 纳入偏置功能部分开始运作。 利用该结构，实现了在操作元件的正交偏置功能部分之前，两个自由层的磁化方向是否可靠地彼此反平行。

    MAGNETO-RESISTIVE EFFECT DEVICE OF THE CPP TYPE, AND MAGNETIC DISK SYSTEM
    50.
    发明申请
    MAGNETO-RESISTIVE EFFECT DEVICE OF THE CPP TYPE, AND MAGNETIC DISK SYSTEM 有权
    CPP类型和磁盘系统的磁阻效应器件

    公开(公告)号：US20090180217A1

    公开(公告)日：2009-07-16

    申请号：US12014575

    申请日：2008-01-15

    申请人： Tsutomu Chou ,  Yoshihiro Tsuchiya ,  Daisuke Miyauchi ,  Kiyoshi Noguchi

    发明人： Tsutomu Chou ,  Yoshihiro Tsuchiya ,  Daisuke Miyauchi ,  Kiyoshi Noguchi

    IPC分类号： G11B5/127

    CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3912 ,  G11B5/3932 ,  G11B2005/3996

    摘要： A magnetoresistive device comprising a magnetoresistive unit, an upper shield layer and a lower shield shield layer stacked such that the magnetoresistive unit is held between them. The magnetoresistive unit comprises a nonmagnetic metal intermediate layer, a first ferromagnetic layer and a second ferromagnetic layer stacked with the nonmagnetic metal intermediate layer in the middle. When no bias magnetic field is applied, the first and second ferromagnetic layers have mutually antiparallel magnetizations. The magnetoresistive unit further comprises first and second side shield layers, and first and second biasing layers located to be magnetically coupled to the first and second side shield layers, wherein magnetic fluxes fed from the bias magnetic fields pass through the first and second side shield layers positioned in proximity to the magnetoresistive unit such that the magnetizations of the first and second ferromagnetic layers become substantially orthogonal to each other.

    摘要翻译： 磁阻器件包括磁阻单元，上屏蔽层和下屏蔽屏蔽层，以便将磁阻单元保持在它们之间。 磁阻单元包括在中间与非磁性金属中间层堆叠的非磁性金属中间层，第一铁磁层和第二铁磁层。 当不施加偏置磁场时，第一和第二铁磁层具有相互反平行的磁化。 磁阻单元还包括第一和第二侧屏蔽层，以及第一和第二偏置层，其被定位成磁耦合到第一和第二侧屏蔽层，其中从偏置磁场馈送的磁通量通过第一和第二侧屏蔽层 位于磁阻单元附近，使得第一和第二铁磁层的磁化基本上彼此正交。