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1. 发明专利

JP2014032721A Microwave assisted magnetic recording head and magnetic recording medium with spin torque oscillator 有权
标题翻译：微波辅助磁记录头和带旋转扭矩振荡器的磁记录介质
公开(公告)号：JP2014032721A
公开(公告)日：2014-02-20
申请号：JP2012172200
申请日：2012-08-02
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： SATO AKIRA , WATANABE KATSURO , KATO KEIZO , IGARASHI KAZUSUKATSU
IPC分类号： G11B5/31 , G11B5/02 , H01L29/82 , H01L43/08
CPC分类号： G11B5/17 , G11B5/3146 , G11B2005/0024
摘要： PROBLEM TO BE SOLVED: To provide a spin torque oscillator corresponding to a high-speed data transfer rate and enabling assisted magnetic recording with sufficient size.SOLUTION: A spin torque oscillator includes a lamination spin injection layer and a high-frequency field generating layer. The lamination spin injection layer has a laminated structure including a first magnetic layer, a combining layer, and a second magnetic layer laminated in sequence from the side far from the high-frequency field generating layer. Magnetization of the first magnetic layer and the second magnetic layer are coupled in anti-parallel. In the second magnetic layer, polarity of magnetization is inverted before magnetic-field-polarity inversion of leakage field from a main pole.
摘要翻译：要解决的问题：提供对应于高速数据传输速率的自旋扭矩振荡器，并且能够实现足够尺寸的辅助磁记录。解决方案：自旋扭矩振荡器包括层压自旋注入层和高频场产生层。层叠自旋注入层具有从远离高频场产生层的一侧依次层叠的第一磁性层，组合层和第二磁性层的叠层结构。第一磁性层和第二磁性层的磁化反平行耦合。在第二磁性层中，在从主极泄漏场的磁场极性反转之前，磁化极性反转。

2. 发明专利

JP2013175250A Magnetic head and manufacturing method thereof, and magnetic recording reproducer 有权
标题翻译：磁头及其制造方法及磁记录重放器
公开(公告)号：JP2013175250A
公开(公告)日：2013-09-05
申请号：JP2012037976
申请日：2012-02-23
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： SUGIURA KENJI , WATANABE KATSURO , IGARASHI KAZUSUKATSU , SATO AKIRA
IPC分类号： G11B5/31 , G11B5/02 , H01L21/8246 , H01L27/105 , H01L29/82 , H01L43/08
CPC分类号： G11B5/1276 , G11B5/1278 , G11B5/3146 , G11B5/3163 , G11B2005/0024
摘要： PROBLEM TO BE SOLVED: To attain high-density recording by narrowing a width in a track width direction of a high-frequency magnetic field obtained by an oscillator and enhancing an oscillation frequency, in a magnetic head of a high-frequency magnetic field assist recording system.SOLUTION: After an oscillator for generating a high-frequency magnetic field, provided in the vicinity of a main magnetic pole 120 for generating a recording magnetic field, is subjected to patterning by a conventional photolithography or the like, on a side surface in a track width direction, oxidation, nitriding or oxynitriding treatment is performed. Consequently, on the side surface in the track width direction of the oscillator, an oxidation film 140, nitride film or oxynitride film, which is a component of the oscillator, is formed, and the shape of the oscillator becomes circular.
摘要翻译：要解决的问题：为了通过使通过振荡器获得的高频磁场的磁道宽度方向上的宽度变窄并增加振荡频率来获得高密度记录，在高频磁场辅助记录的磁头中系统。解决方案：在用于产生记录磁场的主磁极120附近产生用于产生高频磁场的振荡器之后，通过常规光刻法等在图1中的侧表面上进行图案化进行轨迹宽度方向，氧化，氮化或氮氧化处理。因此，在振荡器的轨道宽度方向的侧表面上形成作为振荡器的一部分的氧化膜140，氮化物膜或氮氧化物膜，并且振荡器的形状变为圆形。

3. 发明专利

JP2003303408A Magnetic recording medium 审中-公开
标题翻译：磁记录介质
公开(公告)号：JP2003303408A
公开(公告)日：2003-10-24
申请号：JP2002103331
申请日：2002-04-05
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： AKAGI FUMIKO , IGARASHI KAZUSUKATSU , HIRAYAMA YOSHIYUKI
IPC分类号： G11B5/66 , G11B5/65 , G11B5/738 , H01F10/16
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium wherein each ferromagnetic layer has antiferromagnetic coupling even when the ferromagnetic layer of an AFC medium becomes thick, noise is low, and the influence of thermal fluctuation is suppressed.
SOLUTION: This magnetic recording medium is provided with a magnetic recording layer formed through a foundation layer on a substrate. In this case, the magnetic recording layer has at least two ferromagnetic layers antiferromagnetically coupled with each other through a nonferromagnetic layer, and an antiferromagnetic layer is disposed below the magnetic recording layer closest to the foundation layer.
COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：为了提供一种磁记录介质，其中即使当AFC介质的铁磁层变厚时，每个铁磁层也具有反铁磁耦合，噪声低，并且抑制了热波动的影响。解决方案：该磁记录介质设置有通过基底上的基底层形成的磁记录层。在这种情况下，磁记录层具有通过非铁磁层彼此反铁磁耦合的至少两个铁磁层，并且反铁磁层设置在最靠近基底层的磁记录层的下方。版权所有（C）2004，JPO

4. 发明专利

JP2000215434A MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JP2000215434A
公开(公告)日：2000-08-04
申请号：JP1335899
申请日：1999-01-21
申请人： HITACHI LTD
发明人： INABA NOBUYUKI , YAMAMOTO TOMOO , TAKEUCHI TERUAKI , IGARASHI KAZUSUKATSU , TAKAHASHI YOSHIO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/714 , G11B5/738 , G11B5/85 , G11B5/851 , H01F10/30
摘要： PROBLEM TO BE SOLVED: To obtain a magnetic recording medium having high magnetically anisotropic energy, ensuring a stable magnetized state for recording in the service temperature range of a device, generating little medium noise and suitable for high density recording by specifying magnetically anisotropic energy at a specified absolute temperature, the average grain diameter of magnetic grains and the ratio between magnetic anisotropy constants at different absolute temperatures. SOLUTION: This magnetic recording medium has a magnetic recording film having >=3.6×106 erg/cc magnetic anisotropy constant Ku (T=300 K) at 300 K absolute temperature T and >5 to =0.85 between the magnetic anisotropy constant Ku (300 K) at 300 K absolute temperature T and the magnetic anisotropy Ku (350 K) at 350 K absolute temperature T. The magnetic recording film is deposited by ECR sputtering and heat treatment is carried out after deposition.

5. 发明专利

JPH1186210A MAGNETIC HEAD AND MAGNETIC DISK APPARATUS USING THE SAME 失效
公开(公告)号：JPH1186210A
公开(公告)日：1999-03-30
申请号：JP23558797
申请日：1997-09-01
申请人： HITACHI LTD
发明人： SAITO IKUO , MARUYAMA YOJI , IGARASHI KAZUSUKATSU , SUZUKI YOSHIO
IPC分类号： G11B5/31 , G11B5/00 , G11B5/012 , G11B5/024 , G11B5/03 , G11B5/09 , G11B5/127 , G11B5/17 , G11B5/265 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To restrict a bit shift amount within a predetermined value even when a scanning density of a magnetic disk apparatus is increased by using a head provided with a demagnetization part demagnetizing in a perpendicular direction to a recording direction, i.e., in a truck width direction. SOLUTION: A recording reproduction separation type head having demagnetization magnetic poles includes an upper magnetic pole 1 of a recording head, coils 2 for exciting a magnetic field of the recording head, a lower magnetic pole 3 of the recording head, a demagnetization right magnetic pole 4, a coil 5 for exciting a demagnetization magnetic field, a shield for a magnetoresistance effect type reproduction head as well as for the lower magnetic pole of the recording head, a left demagnetization magnetic pole 6, an upper shield 7 for the magnetoresistance effect type reproduction head, an electrode 8 for supplying a current to a magnetoresistance effect type sensor and, the magnetoresistance effect type sensor 9, etc. The demagnetization magnetic pole having a function of uniforming a state of a written position is provided at the head, so that recordings written earlier are deleted to prevent a shift of a record position for information to be written later because of influences of the already written recordings.

6. 发明专利

JPH0863731A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH0863731A
公开(公告)日：1996-03-08
申请号：JP19547994
申请日：1994-08-19
申请人： HITACHI LTD
发明人： YAKU SHINAN , MATSUDA YOSHIFUMI , INAGAKI YUZURU , FUJITA SHIOJI , YONEKAWA TAKAO , SHODA MITSUHIRO , KATO AKIRA , HOSOE YUZURU , IGARASHI KAZUSUKATSU
IPC分类号： G11B5/66 , G11B5/65 , G11B5/73 , G11B5/82 , G11B33/08
摘要： PURPOSE: To obtain a magnetic recording medium capable of high density recording by keeping high shock resistance as well as to increase the coercive force of the recording medium and to enhance the output by applying large intrasurface compressive strain to a magnetic layer. CONSTITUTION: The coefft. of linear expansion of the nonmetallic non-magnetic substrate 11 of a medium at ordinary temp. is made higher than that of a magnetic layer 13 having a negative magnetostriction constant. For example, the coefft. of linear expansion of the substrate 11 is regulated to 0.000013-0.0001/deg. against 0.000012/deg. coefft. of linear expansion of the magnetic layer 13. Since large intrasurface compressive strain is applied to the magnetic layer at ordinary temp., t.he objective medium having large coercive force while keeping high shock resistance is obtd.

7. 发明专利

JP2013254547A MICROWAVE ASSISTED RECORDING MAGNETIC HEAD AND MAGNETIC RECORDING/REPRODUCING APPARATUS 审中-公开
公开(公告)号：JP2013254547A
公开(公告)日：2013-12-19
申请号：JP2012130764
申请日：2012-06-08
申请人： HITACHI LTD
发明人： WATANABE KATSURO , IGARASHI KAZUSUKATSU
IPC分类号： G11B5/31 , G11B5/02
摘要： PROBLEM TO BE SOLVED: To suppress a spread of not only a recording magnetic field generated from a main pole but also a high-frequency magnetic field generated from a spin torque oscillator in a microwave assisted recording head.SOLUTION: A main pole 22 and a spin torque oscillator 40 are surrounded by a trailing shield layer 24 and are also surrounded by a side/leading shield layer 26 with an insulator sidegap layer 271 interposed therebetween, and a high-frequency magnetic field shield layer 241, which absorbs a high-frequency magnetic field generated from the spin torque oscillator, is arranged in at least part of the shield layer.

8. 发明专利

JP2013069409A Magnetic recording head and magnetic recording device 有权
标题翻译：磁记录头和磁记录装置
公开(公告)号：JP2013069409A
公开(公告)日：2013-04-18
申请号：JP2012280733
申请日：2012-12-25
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IGARASHI KAZUSUKATSU , MATSUBARA MASATO , NAGASAKA KEIICHI , SHIIMOTO MASATO
IPC分类号： G11B5/31
摘要： PROBLEM TO BE SOLVED: To realize an information transfer rate over 2 Gbit/s in microwave assisted magnetic recording which is applied to a magnetic recording device having recording density over 1 Tbit/in.SOLUTION: In structure comprising: a vertical free layer 1 having a magnetic anisotropy axis in a vertical direction to a film surface; and an in-plane free layer 2 consisting of a magnetic film having an easy magnetization surface effectively in the film surface, spin information is exchanged between both the free layers by applying current from the in-plane free layer 2 side to the vertical free layer 1 side, thereby, as a spin torque oscillation device for microwave assisted magnetic recording, the spin torque oscillation device, which becomes to a state that magnetization of both the free layers is substantially anti-parallel to each other and the device exhibits high-speed magnetization rotation along an interfacial boundary of both the free layers, is used. It is preferable that the vertical free layer 1 is made thinner than the in-plane free layer 2. It is preferable that a magnetic anisotropic magnetic field due to material of the vertical free layer nearly competes with an effective demagnetizing field in a vertical direction in an opposite direction. Further, it is more preferable that the vertical free layer is located at a main magnetic pole side.
摘要翻译：要解决的问题：为了实现微波辅助磁记录中超过2Gbit / s的信息传输速率，其应用于具有超过1Tbit / in的记录密度的磁记录装置 2 < / SP>。解决方案：结构包括：垂直自由层1，其在垂直于膜表面的方向上具有磁各向异性轴; 以及由膜表面有效地具有易磁化表面的磁性膜构成的面内自由层2，通过从面内自由层2侧向垂直自由层施加电流，在两自由层之间交换自旋信息因此，作为微波辅助磁记录的自旋转矩振荡装置，自旋扭矩振荡装置成为两个自由层的磁化基本上相互平行的状态，并且该装置显示高速使用沿两个自由层的界面边界的磁化旋转。优选垂直自由层1比平面内自由层2薄。优选地，垂直自由层的材料的磁各向异性磁场几乎与垂直方向上的有效去磁场竞争相反的方向。此外，更优选的是，垂直自由层位于主磁极侧。版权所有（C）2013，JPO＆INPIT

9. 发明专利

JP2012108981A MICROWAVE-ASSISTED MAGNETIC RECORDING HEAD AND MAGNETIC RECORDING AND REPRODUCING DEVICE 审中-公开
公开(公告)号：JP2012108981A
公开(公告)日：2012-06-07
申请号：JP2010257406
申请日：2010-11-18
申请人： HITACHI LTD
发明人： SOEYA SUSUMU , IGARASHI KAZUSUKATSU , SHIIMOTO MASATO
IPC分类号： G11B5/31 , G11B5/02
摘要： PROBLEM TO BE SOLVED: To provide a negative high-magnetic anisotropy material used as a high-frequency magnetic field generating layer of a microwave-assisted magnetic recording head which increases a maximum magnetic field oscillation frequency from the high-frequency magnetic field generating layer constituting the head and which stably oscillates a high-frequency magnetic field so as to realize high surface recording density.SOLUTION: A microwave-assisted magnetic recording head includes at least a high-frequency magnetic field generating layer 300, a spin conducting layer 400 and a fixed layer 500 between a main magnetic pole 100 and a magnetic shield 700. The high-frequency magnetic field generating layer is made of a new material or a CoFe-Ir based alloy film.

10. 发明专利

JP2003151116A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDER USING THE SAME 审中-公开
公开(公告)号：JP2003151116A
公开(公告)日：2003-05-23
申请号：JP2001344017
申请日：2001-11-09
申请人： HITACHI LTD
发明人： IGARASHI KAZUSUKATSU , AKAGI FUMIKO , HIRAYAMA YOSHIYUKI , YAMAMOTO TOMOO , TOMIYAMA HIROSHI , HOSOE YUZURU
IPC分类号： G11B5/66 , G11B5/64
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium suitable for high density magnetic recording with high resolution, low noise and small thermal fluctuation, and a mass magnetic storage device realized in using the medium, etc. SOLUTION: In this magnetic recording medium having at least three or more magnetic layers on a non-magnetic substrate, when a magnetic layer which is farthest from the non-magnetic substrate is used as a magnetic layer for recording, a magnetic layer which is father from the non-magnetic substrate next to the layer for recording is used as a magnetic layer for stabilization, and the entire magnetic layers other than the magnetic layer for recording and the magnetic layer for stabilization are used as a group of lower magnetic layers, an AFC type thin film magnetic recording medium has a connection layer made of non-magnetic material or weak magnetic material having nature that makes the magnetization of a contact magnetic layer reverse between the magnetic layer for recording and the magnetic layer for stabilization, and uses a magnetic recording medium, wherein the rearrangement of the magnetic layer for stabilization and the group of lower magnetic layers generally ends within 10 millisecond after recording.

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