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1. 发明专利

JP2011248985A Magnetic head used for single recording system and magnetic disk drive 有权
标题翻译：用于单个记录系统和磁盘驱动器的磁头
公开(公告)号：JP2011248985A
公开(公告)日：2011-12-08
申请号：JP2010124342
申请日：2010-05-31
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KATADA HIROYUKI , ICHIHARA TAKAYUKI , KAWATO YOSHIAKI
IPC分类号： G11B5/39 , G11B5/09 , G11B5/187 , G11B5/31 , G11B5/56 , G11B5/58
CPC分类号： G11B5/3912 , G11B5/1278 , G11B5/3967
摘要： PROBLEM TO BE SOLVED: To achieve a low bit error rate by preventing signal resolution from being deteriorated and a signal to noise ratio from being reduced by transition curvature between non-symmetrical bits in a magnetic head used for a single recording system.SOLUTION: The magnetic head is constituted of a recording head and a reproducing head, and the reproducing head includes a pair of magnetic shields 2, 3 and a sensor part 1 sandwiched between the pair of the magnetic shields. The longitudinal direction of a gap between the magnetic shields is formed by being inclined approximately at an angle θ from the cross track direction along a curvature shape of transition between the bits in the effective recording track of a recording pattern recorded on the recording medium.
摘要翻译：要解决的问题：通过防止信号分辨率恶化并且信噪比由用于单个记录系统的磁头中的非对称比特之间的转变曲率减小来实现低比特错误率。解决方案：磁头由记录头和再现头构成，再现头包括一对磁屏蔽2,3和夹在一对磁屏蔽之间的传感器部分1。通过沿着记录在记录介质上的记录图案的有效记录轨道中的位之间的转变的曲率形状，从横向方向大致倾斜角度θ，形成磁屏蔽之间的间隙的纵向方向。版权所有（C）2012，JPO＆INPIT

2. 发明专利

JP2009301598A Magnetic recording/reproduction head 审中-公开
标题翻译：磁记录/复印头
公开(公告)号：JP2009301598A
公开(公告)日：2009-12-24
申请号：JP2008151224
申请日：2008-06-10
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： SHIIMOTO MASATO , KATADA HIROYUKI , NAKAGAWA TAKESHI , YASUI KAN , SATO AKIRA
IPC分类号： G11B5/39 , H01L43/08
CPC分类号： G11B5/3909 , B82Y10/00 , B82Y25/00 , G11B5/3954 , G11B2005/3996
摘要： PROBLEM TO BE SOLVED: To provide a reproducing head from which a good bit error rate is obtained without generating baseline shift even if the maximum varying resistance amounts of two magneto-resistive elements differ in a differential-type reproducing head. SOLUTION: A differential-type reproducing head 20 has a laminated structure 400, in which a first magnetoresistance effect element 200 which has a first free layer 210, a differential gap layer 100, and a second magnetoresistance effect element 300 which has a second free layer 310 are laminated. Here the relations for the varying amount of the maximum resistance of magneto-resistive element and the magnetic domain controlling magnetic field impressed on the free layer are made to satisfy the relation: when a relation DR1>DR2 holds, HB1>HB2 is satisfied; and when DR2>DR1, HB2>HB1 is satisfied, where the varying amounts of the maximum resistance of the first magneto-resistive element 200 and the second magneto-resistive element 300 are set to DR1 and DR2, respectively, and the magnetic domain controlling magnetic field impressed to the first free layer and the magnetic domain controlling magnetic field impressed to the second free layer are set to HB1 and HB2, respectively. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：即使在差分型再现头中两个磁阻元件的最大变化电阻量不同的情况下，提供一种再现头，从而可以获得良好的误码率而不产生基线偏移。解决方案：差分型再现头20具有层叠结构400，其中具有第一自由层210，差分间隙层100和第二磁阻效应元件300的第一磁阻效应元件200具有层叠第二自由层310。这里，使自由层上施加的磁阻元件的最大电阻的变化量和磁畴控制磁场的关系满足关系：当关系DR1> DR2成立时，满足HB1> HB2; 并且当满足DR2> DR1，HB2> HB1时，其中第一磁阻元件200和第二磁阻元件300的最大电阻的变化量分别被设置为DR1和DR2，并且磁畴控制施加到第一自由层的磁场和施加到第二自由层的磁畴控制磁场分别设置为HB1和HB2。版权所有（C）2010，JPO＆INPIT

3. 发明专利

JP2009193635A Magnetic recording and reproducing head and magnetic recording and reproducing device 有权
标题翻译：磁记录和再现磁头和磁记录和再现装置
公开(公告)号：JP2009193635A
公开(公告)日：2009-08-27
申请号：JP2008033111
申请日：2008-02-14
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： SHIIMOTO MASATO , NAKAGAWA TAKESHI , KATADA HIROYUKI , ITO NAOTO , MEGURO KENICHI
IPC分类号： G11B5/39 , G11B5/31 , H01L43/08
CPC分类号： G11B5/3909 , B82Y10/00 , B82Y25/00 , G11B5/3912 , G11B5/3967 , G11B2005/3996
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording and reproducing head which can achieve a high reproduction output, resolution and SNR even at a high linear recording density, and to provide a magnetic recording and reproducing device which can achieve a sufficient bit error rate.
SOLUTION: The magnetic recording and reproducing head 10 has a differential reproducing head 20 and a recording head 25. The differential reproducing head 20 has a first magnetoresistive element 200 having a first free layer 210, a differential gap layer 100, a multilayer structure 400 where a second magnetoresistive element 300 having a second free layer 310 is laminated, a pair of electrodes 50 and 51, and a pair of magnetic shields 30 and 31 outside the multilayer structure 400. Here, a ratio (G1/b1) of an internal distance (G1) between the first free layer 210 and the second free layer 310 to a bit length (b1) is set between 0.6 to 1.6.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供即使在高线性记录密度下也可实现高再现输出，分辨率和SNR的磁记录和再现头，并且提供可以实现足够位的磁记录和再现装置错误率。解决方案：磁记录和再现头10具有差分再现头20和记录头25.差分再现头20具有第一磁阻元件200，其具有第一自由层210，差动间隙层100，多层结构400，其中层叠具有第二自由层310的第二磁阻元件300，一对电极50和51以及多层结构400外的一对磁屏蔽30和31.这里，比例（G1 / b1）将第一自由层210和第二自由层310之间的位置长度（b1）的内部距离（G1）设定在0.6至1.6之间。版权所有（C）2009，JPO＆INPIT

4. 发明专利

JP2009064528A Magnetoresistance effect head and manufacturing method thereof 审中-公开
标题翻译：磁阻效应头及其制造方法
公开(公告)号：JP2009064528A
公开(公告)日：2009-03-26
申请号：JP2007233112
申请日：2007-09-07
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MEGURO KENICHI , SHIIMOTO MASATO , HOSHIYA HIROYUKI , KATADA HIROYUKI , HOSHINO KATSUMI
IPC分类号： G11B5/39 , H01L43/08
摘要： PROBLEM TO BE SOLVED: To provide a differential operation type magnetoresistance effect head which has high reproducing resolution of a linear recording density direction, and stable response characteristics. SOLUTION: A differential operation type magnetoresistance effect film is composed of a first magnetoresistance effect film (a fixed layer/an intermediate layer/a free layer) 100, a conductive gap layer 110, and a second magnetoresistance effect film (a free layer/an intermediate layer/a fixed layer) 120. The conductive gap layer is constituted by a bias magnetic field providing layer to apply a vertical bias magnetic field in a track direction to the first free layer and the second free layer. The bias magnetic field providing layer comprises ferromagnetic layers which are held between two nonmagnetic layers, and in which magnetization is fixed in a track width direction. COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：提供具有高线性记录密度方向的再现分辨率和稳定的响应特性的差分运算型磁阻效应头。解决方案：差分操作型磁阻效应膜由第一磁阻效应膜（固定层/中间层/自由层）100，导电间隙层110和第二磁阻效应膜（无层/中间层/固定层）120.导电间隙层由偏置磁场提供层构成，以在轨道方向上向第一自由层和第二自由层施加垂直偏置磁场。偏置磁场提供层包括保持在两个非磁性层之间的铁磁层，并且其中磁化沿磁道宽度方向固定。版权所有（C）2009，JPO＆INPIT

5. 发明专利

JP2013048002A Magnetic recording and reproducing device, and microwave assisted magnetic recording method 有权
标题翻译：磁记录和再现装置以及微波辅助磁记录方法
公开(公告)号：JP2013048002A
公开(公告)日：2013-03-07
申请号：JP2011186450
申请日：2011-08-29
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KATADA HIROYUKI , NISHIDA YASUTAKA , SHIIMOTO MASATO
IPC分类号： G11B5/02 , G11B5/31 , H01L29/82 , H01L43/08
CPC分类号： G11B5/1278 , G11B5/607 , G11B2005/0024
摘要： PROBLEM TO BE SOLVED: To enhance reliability by correcting a write error due to unstable oscillation of a spin torque oscillator in microwave assisted magnetic recording.SOLUTION: A magnetic recording and reproducing device has a resistance measurement part which measures the resistance value of a spin torque oscillator, and monitors the resistance value to detect that oscillation has become 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：要解决的问题：通过在微波辅助磁记录中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。解决方案：磁记录和再现装置具有测量自旋扭矩振荡器的电阻值的电阻测量部分，并且监视电阻值以检测在记录期间振荡已经变得不稳定。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。版权所有（C）2013，JPO＆INPIT

6. 发明专利

JP2010135039A Magnetic head 有权
标题翻译：磁头
公开(公告)号：JP2010135039A
公开(公告)日：2010-06-17
申请号：JP2008312505
申请日：2008-12-08
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： SHIIMOTO MASATO , KATADA HIROYUKI , YASUI KAN , MEGURO KENICHI
IPC分类号： G11B5/39
CPC分类号： G11B5/3906
摘要： PROBLEM TO BE SOLVED: To provide a differential type reproduction head which realizes high resolution and high precision in forming a track width. SOLUTION: In a first magneto-resistive effect element 200, a first fixed layer 230, a first intermediate layer 220 and a first free layer 210 are laminated in this order from a substrate side. In a second magneto-resistive effect element 300, a second fixed layer 330, a second intermediate layer 320, and a second free layer 310 are laminated in this order from the first free layer 210. The second fixed layer 330 and the second intermediate layer 320 substantially play a role as a differential gap. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供在形成轨道宽度时实现高分辨率和高精度的差分型再现头。解决方案：在第一磁阻效应元件200中，从衬底侧依次层叠第一固定层230，第一中间层220和第一自由层210。在第二磁阻效应元件300中，从第一自由层210依次层叠第二固定层330，第二中间层320和第二自由层310.第二固定层330和第二中间层 320基本上起着差距的作用。版权所有（C）2010，JPO＆INPIT

7. 发明专利

JP2012108971A SPIN-TORQUE OSCILLATOR FOR MICROWAVE ASSISTED MAGNETIC RECORDING 审中-公开
公开(公告)号：JP2012108971A
公开(公告)日：2012-06-07
申请号：JP2010255700
申请日：2010-11-16
申请人： HITACHI LTD
发明人： MATSUBARA MASATO , SHIIMOTO MASATO , KATADA HIROYUKI , NAGASAKA KEIICHI
IPC分类号： G11B5/31 , G11B5/02 , H01L29/82 , H01L43/08
摘要： PROBLEM TO BE SOLVED: To solve such a problem that, in a magnetic head for performing microwave assisted recording, since a difference in a demagnetization field between the end and the center of a field generation layer (FGL) grows larger as saturation magnetization of the FGL grows larger, the FGL that generates a microwave is not oscillated in a state of a single magnetic domain.SOLUTION: A spin-torque oscillator used for a magnetic head for microwave assisted recording includes at least one or more fixed layers, non-magnetic intermediate layers and alternating-current magnetic field generation layers, respectively, and is provided with a structure where saturation magnetization at ends of a film except the end in a direction of an opposite surface to a floating surface is made smaller than saturation magnetization in the center of the film of the alternating-current magnetic field generation layer.

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