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1.发明申请公开(公告)号：US20090207531A1
公开(公告)日：2009-08-20
申请号：US12365195
申请日：2009-02-04
IPC分类号： G11B5/33
CPC分类号： G11B5/3909 , B82Y10/00 , B82Y25/00 , G11B5/3912 , G11B5/3967 , G11B2005/3996
摘要： A magnetic recording read head is provided capable of achieving high reproduction output, resolution, and SNR, even at a high linear density. There is also provided a magnetic recording and reproducing device capable of achieving sufficient error bit rate. The magnetic recording read head includes a differential read head and a write head. The differential read head has a multilayer structure formed by laminating a first magnetoresistive sensor having a first free layer, a differential gap layer, and a second magnetoresistive sensor having a second free layer. Outside the multilayer structure, a pair of electrodes and a pair of magnetic shields are provided respectively. A ratio (Gl/bl) of an inside distance (Gl) between the first and second free layers to a bit length (bl) is set to 0.6 or more and 1.6 or less.
摘要翻译： 提供了能够实现高再现输出，分辨率和SNR的磁记录读取头，即使在高线性密度下也是如此。 还提供了能够实现足够的错误比特率的磁记录和再现装置。 磁记录读取头包括差分读取头和写入头。 差分读取头具有层叠具有第一自由层，差分间隙层的第一磁阻传感器和具有第二自由层的第二磁阻传感器形成的多层结构。 在多层结构之外，分别设置一对电极和一对磁屏蔽。 将第一自由层与第二自由层之间的内部距离（G1）与比特长度（b1）的比（G1 / b1）设定为0.6以上且1.6以下。
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2.发明授权公开(公告)号：US08270122B2
公开(公告)日：2012-09-18
申请号：US12365195
申请日：2009-02-04
IPC分类号： G11B5/39
CPC分类号： G11B5/3909 , B82Y10/00 , B82Y25/00 , G11B5/3912 , G11B5/3967 , G11B2005/3996
摘要： A magnetic recording read head is provided capable of achieving high reproduction output, resolution, and SNR, even at a high linear density. There is also provided a magnetic recording and reproducing device capable of achieving sufficient error bit rate. The magnetic recording read head includes a differential read head and a write head. The differential read head has a multilayer structure formed by laminating a first magnetoresistive sensor having a first free layer, a differential gap layer, and a second magnetoresistive sensor having a second free layer. Outside the multilayer structure, a pair of electrodes and a pair of magnetic shields are provided respectively. A ratio (Gl/bl) of an inside distance (Gl) between the first and second free layers to a bit length (bl) is set to 0.6 or more and 1.6 or less.
摘要翻译： 提供了能够实现高再现输出，分辨率和SNR的磁记录读取头，即使在高线性密度下也是如此。 还提供了能够实现足够的错误比特率的磁记录和再现装置。 磁记录读取头包括差分读取头和写入头。 差分读取头具有层叠具有第一自由层，差分间隙层的第一磁阻传感器和具有第二自由层的第二磁阻传感器形成的多层结构。 在多层结构之外，分别设置一对电极和一对磁屏蔽。 将第一自由层与第二自由层之间的内部距离（G1）与比特长度（b1）的比（G1 / b1）设定为0.6以上且1.6以下。
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公开(公告)号：US20110181987A1
公开(公告)日：2011-07-28
申请号：US12997518
申请日：2009-05-19
申请人： Masato Shiimoto , Hiroyuki Katada , Takeshi Nakagawa , Kan Yasui , Yo Sato
发明人： Masato Shiimoto , Hiroyuki Katada , Takeshi Nakagawa , Kan Yasui , Yo Sato
IPC分类号： G11B5/39
CPC分类号： G11B5/3909 , B82Y10/00 , B82Y25/00 , G11B5/3954 , G11B2005/3996
摘要： Provided is a differential type reproduction head which can obtain a preferable bit error rate without causing a baseline shift even when two magnetoresistive elements have different maximum resistance change amounts. The differential type reproduction head has a layered structure formed by a first magnetoresistive element having a first free layer, a differential gap layer, and a second magnetoresistive element having a second free layer. When DR1 and DR2 are the maximum resistance change amounts of the first magnetoresistive element and the second magnetoresistive element, respectively, HB1 is a magnetic domain control field applied to the first free layer, and HB2 is a magnetic domain control field applied to the second free layer, the following relationships are satisfied: HB1>HB2 when DR1>DR2; HB2>HB1 when DR2>DR1.
摘要翻译： 提供了一种差分型再现头，即使当两个磁阻元件具有不同的最大电阻变化量时，也可以获得优选的误码率，而不引起基线偏移。 差分型再现头具有由具有第一自由层，差分间隙层和具有第二自由层的第二磁阻元件的第一磁阻元件形成的分层结构。 当DR1和DR2分别是第一磁阻元件和第二磁阻元件的最大电阻变化量时，HB1分别是施加到第一自由层的磁畴控制场，HB2是施加到第二自由电阻的磁畴控制场 层，满足以下关系：当DR1> DR2时，HB1> HB2; HB2> DR1> DR1时HB1。
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4.发明申请公开(公告)号：US20100118448A1
公开(公告)日：2010-05-13
申请号：US12615221
申请日：2009-11-09
申请人： Kan Yasui , Masato Shiimoto , Takeshi Nakagawa , Hiroyuki Katada , Nobuo Yoshida , Hiroyuki Hoshiya
发明人： Kan Yasui , Masato Shiimoto , Takeshi Nakagawa , Hiroyuki Katada , Nobuo Yoshida , Hiroyuki Hoshiya
IPC分类号： G11B5/127
CPC分类号： G11B5/3163 , G11B5/398
摘要： In one embodiment, a differential-type magnetic read head includes a differential-type magneto-resistive-effect film formed on a substrate, and a pair of electrodes for applying current in a direction perpendicular to a film plane of the film. The film includes a first and second stacked film, each having a pinned layer, an intermediate layer, and a free layer, with the second stacked film being formed on the first stacked film. A side face in a track width direction of the film is shaped to have an inflection point at an intermediate position in a thickness direction of the film, and the side face is shaped to be approximately vertical to the substrate in an upward direction of the substrate from the inflection point. Also, the side face is shaped to be gradually increased in track width as approaching the substrate in a downward direction of the substrate from the inflection point.
摘要翻译： 在一个实施例中，差分型磁读头包括形成在基板上的差分型磁阻效应膜和用于在垂直于膜的膜平面的方向上施加电流的一对电极。 膜包括第一和第二堆叠膜，每个具有钉扎层，中间层和自由层，第二堆叠膜形成在第一堆叠膜上。 膜的轨道宽度方向的侧面成形为在膜的厚度方向上的中间位置具有拐点，并且侧面成形为在基板的上方大致垂直于基板 从拐点。 此外，侧面被成形为在从拐点向基板向下方向接近基板的轨迹宽度上逐渐增加。
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5.发明授权公开(公告)号：US08223464B2
公开(公告)日：2012-07-17
申请号：US12615221
申请日：2009-11-09
申请人： Kan Yasui , Masato Shiimoto , Takeshi Nakagawa , Hiroyuki Katada , Nobuo Yoshida , Hiroyuki Hoshiya
发明人： Kan Yasui , Masato Shiimoto , Takeshi Nakagawa , Hiroyuki Katada , Nobuo Yoshida , Hiroyuki Hoshiya
CPC分类号： G11B5/3163 , G11B5/398
摘要： In one embodiment, a differential-type magnetic read head includes a differential-type magneto-resistive-effect film formed on a substrate, and a pair of electrodes for applying current in a direction perpendicular to a film plane of the film. The film includes a first and second stacked film, each having a pinned layer, an intermediate layer, and a free layer, with the second stacked film being formed on the first stacked film. A side face in a track width direction of the film is shaped to have an inflection point at an intermediate position in a thickness direction of the film, and the side face is shaped to be approximately vertical to the substrate in an upward direction of the substrate from the inflection point. Also, the side face is shaped to be gradually increased in track width as approaching the substrate in a downward direction of the substrate from the inflection point.
摘要翻译： 在一个实施例中，差分型磁读头包括形成在基板上的差分型磁阻效应膜和用于在垂直于膜的膜平面的方向上施加电流的一对电极。 膜包括第一和第二堆叠膜，每个具有钉扎层，中间层和自由层，第二堆叠膜形成在第一堆叠膜上。 膜的轨道宽度方向的侧面成形为在膜的厚度方向上的中间位置具有拐点，并且侧面成形为在基板的上方大致垂直于基板 从拐点。 此外，侧面被成形为在从拐点向基板向下方向接近基板的轨迹宽度上逐渐增加。
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公开(公告)号：US09245548B2
公开(公告)日：2016-01-26
申请号：US12011334
申请日：2008-01-25
CPC分类号： G11B5/3906 , B82Y10/00 , B82Y25/00 , G11B2005/3996 , Y10T428/1121
摘要： Embodiments of the present invention help to reduce mag-noise in a magnetoresistive head without deterioration in reproduced output and improve the signal/noise ratio (SNR) of the magnetoresistive head. According to one embodiment, the magnetoresistive head uses a synthetic ferri free layer and it is arranged such that the magnetic field which is applied to an end of a free layer with smaller film thickness and saturation magnetization in the track width direction by a coupling field is larger than the magnetic field which is applied to it by a bias layer.
摘要翻译： 本发明的实施例有助于减少磁阻磁头中的磁噪声，而不会使再现输出变差，并提高磁阻磁头的信噪比（SNR）。 根据一个实施例，磁阻头使用合成的无自由层，并且其布置成使得通过耦合场施加到具有较小膜厚度和磁道宽度方向上的饱和磁化强度的自由层的端部的磁场是 大于通过偏置层施加到其的磁场。
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公开(公告)号：US08643967B2
公开(公告)日：2014-02-04
申请号：US13402957
申请日：2012-02-23
CPC分类号： G11B5/1278 , G11B5/607 , G11B2005/0024
摘要： The present invention enhances reliability by correcting a write error due to unstable oscillation of a spin torque oscillator. In the present invention, a resistance value of a spin torque oscillator is monitored to detect that oscillation becomes unstable during recording. When a measured resistance value is out of a predefined normal range, information for which the recording operation is already performed is rewritten.
摘要翻译： 本发明通过校正由于自旋扭矩振荡器的不稳定振荡引起的写入误差来提高可靠性。 在本发明中，监视自旋扭矩振荡器的电阻值，以检测在记录期间振荡变得不稳定。 当测量的电阻值超出预定义的正常范围时，重写已经执行了记录操作的信息。
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公开(公告)号：US20120120518A1
公开(公告)日：2012-05-17
申请号：US13296866
申请日：2011-11-15
IPC分类号： G11B5/02
CPC分类号： G11B5/3146 , G11B2005/0024
摘要： In a conventional type magnetic head that performs microwave assisted recording, since a difference in a demagnetizing field between an end and the center of a field generation layer (FGL) grows larger when saturation magnetization of the FGL grows larger, the FGL that generates a microwave is not oscillated in a state of a single domain. Then, a spin-torque oscillator according to the present invention used for a magnetic head for microwave assisted recording is provided with at least one fixed layer, one non-magnetic intermediate layer and one alternating-current magnetic field generation layer respectively and is provided with a structure where saturation magnetization at ends of a film except an end in a direction from an air bearing surface to a surface opposite to it is made smaller than saturation magnetization in the center of the film of the alternating-current magnetic field generation layer.
摘要翻译： 在执行微波辅助记录的常规型磁头中，由于当FGL的饱和磁化强度增大时场强发生层（FGL）的端部和中心之间的消磁场的差异增大，所以产生微波的FGL 在单个域的状态下不振荡。 然后，本发明的用于微波辅助记录磁头的自旋转矩振荡器分别设置有至少一个固定层，一个非磁性中间层和一个交流磁场产生层，并且具有 除了在从空气轴承表面到与其相反的表面的方向上的端部之外，膜的端部处的饱和磁化强度小于交流磁场产生层的膜中心的饱和磁化强度的结构。
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公开(公告)号：US08773822B2
公开(公告)日：2014-07-08
申请号：US13296866
申请日：2011-11-15
IPC分类号： G11B5/33
CPC分类号： G11B5/3146 , G11B2005/0024
摘要： In a conventional type magnetic head that performs microwave assisted recording, since a difference in a demagnetizing field between an end and the center of a field generation layer (FGL) grows larger when saturation magnetization of the FGL grows larger, the FGL that generates a microwave is not oscillated in a state of a single domain. Then, a spin-torque oscillator according to the present invention used for a magnetic head for microwave assisted recording is provided with at least one fixed layer, one non-magnetic intermediate layer and one alternating-current magnetic field generation layer respectively and is provided with a structure where saturation magnetization at ends of a film except an end in a direction from an air bearing surface to a surface opposite to it is made smaller than saturation magnetization in the center of the film of the alternating-current magnetic field generation layer.
摘要翻译： 在执行微波辅助记录的常规型磁头中，由于当FGL的饱和磁化强度增大时场强发生层（FGL）的端部和中心之间的消磁场的差异增大，所以产生微波的FGL 在单个域的状态下不振荡。 然后，本发明的用于微波辅助记录磁头的自旋转矩振荡器分别设置有至少一个固定层，一个非磁性中间层和一个交流磁场产生层，并且具有 除了在从空气轴承表面到与其相反的表面的方向上的端部之外，膜的端部处的饱和磁化强度小于交流磁场产生层的膜中心的饱和磁化强度的结构。
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公开(公告)号：US08223463B2
公开(公告)日：2012-07-17
申请号：US12579854
申请日：2009-10-15
IPC分类号： G11B5/39
CPC分类号： H01L43/08 , B82Y25/00 , G01R33/093 , G11B5/3906 , H01F10/3254 , H01F10/3272
摘要： A magnetoresistive head which has a high head SNR by reducing generated mag-noise without deteriorating an output comprises, according to one embodiment, a magnetoresistive sensor having a laminated structure which includes an antiferromagnetic layer, a magnetization pinned layer, a non-magnetic intermediate layer, a magnetization free layer, and a magnetization stable layer arranged adjacent to the magnetization free layer. The magnetization stable layer comprises non-magnetic coupling layer, a first ferromagnetic stable layer, an antiparallel coupling layer, and a second ferromagnetic stable layer. A magnetization quantity of a first ferromagnetic stable layer and a second ferromagnetic stable layer are substantially equal, and the magnetization of the first ferromagnetic stable layer and the second ferromagnetic stable layer are magnetically coupled in the antiparallel direction from each other. The magnetizations of the first ferromagnetic stable layer and the free layer are coupled in an antiferromagnetic or a ferromagnetic alignment.
摘要翻译： 根据一个实施例，通过减少产生的磁场噪声而具有高磁头噪声的磁阻头包括：根据一个实施例，具有层叠结构的磁阻传感器包括反铁磁层，磁化钉扎层，非磁性中间层 ，无磁化层和邻近无磁化层布置的磁化稳定层。 磁化稳定层包括非磁耦合层，第一铁磁稳定层，反平行耦合层和第二铁磁稳定层。 第一铁磁稳定层和第二铁磁稳定层的磁化量基本相等，第一铁磁稳定层和第二铁磁稳定层的磁化在反平行方向彼此磁耦合。 第一铁磁稳定层和自由层的磁化以反铁磁或铁磁取向耦合。
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