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1. 发明授权

US08264918B2 Near-field recording device having heating mechanism positioned near a trailing side of a magnetic pole 有权
标题翻译：具有位于磁极的后侧附近的加热机构的近场记录装置
公开(公告)号：US08264918B2
公开(公告)日：2012-09-11
申请号：US12537141
申请日：2009-08-06
申请人： Mitsuhiro Hashimoto , Takuya Matsumoto , Fumiko Akagi , Yoshio Suzuki
发明人： Mitsuhiro Hashimoto , Takuya Matsumoto , Fumiko Akagi , Yoshio Suzuki
IPC分类号： G11B11/00
CPC分类号： G11B5/314 , G11B5/4866 , G11B2005/001 , G11B2005/0021
摘要： One purpose of the invention according to one embodiment is to provide a magnetic recording apparatus of high recording density in which magnetization transition curvature amount of a recording pattern is small. In one embodiment, the center of a heating area is arranged at a track edge side of a recording pattern as compared with the width-direction center position of a main magnetic pole of a recording head, and a recording magnetic field is applied while a medium is locally heated at the time of signal recording. A switching magnetic field of the medium is locally reduced by heating, so that a line where the switching magnetic field of the medium is equal to the recording magnetic field from the head approaches the heating center position, and a desired recording pattern in which the transition curvature amount is reduced can be realized. Other systems and methods are also presented.
摘要翻译：根据一个实施例的本发明的一个目的是提供一种高记录密度的磁记录装置，其中记录图案的磁化转变曲率量小。在一个实施例中，与记录头的主磁极的宽度方向中心位置相比，加热区域的中心布置在记录图案的轨道边缘侧，并且在介质上施加记录磁场在信号记录时被局部加热。通过加热局部地减小介质的开关磁场，使得介质的开关磁场等于来自磁头的记录磁场的线路接近加热中心位置，并且其中转变的期望的记录模式可以实现曲率减少。还提出了其他系统和方法。

2. 发明申请

US20100033865A1 MAGNETIC RECORDING METHOD AND MAGNETIC RECORDING APPARATUS 有权
标题翻译：磁记录方法和磁记录装置
公开(公告)号：US20100033865A1
公开(公告)日：2010-02-11
申请号：US12537141
申请日：2009-08-06
申请人： Mitsuhiro Hashimoto , Takuya Matsumoto , Fumiko Akagi , Yoshio Suzuki
发明人： Mitsuhiro Hashimoto , Takuya Matsumoto , Fumiko Akagi , Yoshio Suzuki
IPC分类号： G11B5/02
CPC分类号： G11B5/314 , G11B5/4866 , G11B2005/001 , G11B2005/0021
摘要： One purpose of the invention according to one embodiment is to provide a magnetic recording apparatus of high recording density in which magnetization transition curvature amount of a recording pattern is small. In one embodiment, the center of a heating area is arranged at a track edge side of a recording pattern as compared with the width-direction center position of a main magnetic pole of a recording head, and a recording magnetic field is applied while a medium is locally heated at the time of signal recording. A switching magnetic field of the medium is locally reduced by heating, so that a line where the switching magnetic field of the medium is equal to the recording magnetic field from the head approaches the heating center position, and a desired recording pattern in which the transition curvature amount is reduced can be realized. Other systems and methods are also presented.
摘要翻译：根据一个实施例的本发明的一个目的是提供一种高记录密度的磁记录装置，其中记录图案的磁化转变曲率量小。在一个实施例中，与记录头的主磁极的宽度方向中心位置相比，加热区域的中心布置在记录图案的轨道边缘侧，并且在介质上施加记录磁场在信号记录时被局部加热。通过加热局部地减小介质的开关磁场，使得介质的开关磁场等于来自磁头的记录磁场的线路接近加热中心位置，并且其中转变的期望记录模式可以实现曲率减少。还提出了其他系统和方法。

3. 发明授权

US07773331B2 Thermally assisted magnetic recording system 有权
标题翻译：热辅助磁记录系统
公开(公告)号：US07773331B2
公开(公告)日：2010-08-10
申请号：US11774350
申请日：2007-07-06
申请人： Fumiko Akagi , Takuya Matsumoto , Kimio Nakamura
发明人： Fumiko Akagi , Takuya Matsumoto , Kimio Nakamura
IPC分类号： G11B5/02
CPC分类号： G11B5/1278 , G11B2005/001 , G11B2005/0021
摘要： The optimum head-field intensity for saturation recording is assumed to be 560×103 A/m or more. Under a condition where the recording track width of an information recording medium is equal to or less than 60 nm, the optimum head-field intensity Y satisfies the following inequalities (1) and (2): Y≧(X2−119×X+4135)×1000 (1) Y≦(X2−119×X+const)×1000 (2) where X denotes the nondimensional value of the recording track width divided by 10−9 m, and Y denotes a magnetic field (expressed in units of A/m) which a magnetic pole for head-field application applies to the center of the information recording medium in the direction of the thickness thereof. Note that const=−0.8×v2+33.7×v+4250 if the relative velocity v between the head and the medium at the position of the head is less than 20 m/sec, or const=4600 if the velocity v is equal to or more than 20 m/sec.
摘要翻译：饱和记录的最佳头场强度假定为560×103A / m以上。在信息记录介质的记录磁道宽度等于或小于60nm的条件下，最佳磁头强度Y满足以下不等式（1）和（2）：Y≥（X2-119×X + 4135）×1000（1）Y＆nlE;（X2-119×X + const）×1000（2）其中X表示记录轨道宽度的无量纲除以10-9μm，Y表示磁场用于头场施加的磁极的A / m的单位在信息记录介质的厚度方向上施加到信息记录介质的中心。注意，如果头部和头部位置之间的头部和介质之间的相对速度v小于20 m / sec，则const = -0.8×v2 + 33.7×v + 4250，如果速度v等于，则const = 4600 或超过20米/秒。

4. 发明申请

US20070096854A1 Head for thermal assisted magnetic recording device, and thermal assisted magnetic recording device 失效
标题翻译：热辅助磁记录装置头，热辅助磁记录装置
公开(公告)号：US20070096854A1
公开(公告)日：2007-05-03
申请号：US11590785
申请日：2006-11-01
申请人： Takuya Matsumoto , Fumiko Akagi
发明人： Takuya Matsumoto , Fumiko Akagi
IPC分类号： H01H37/00
CPC分类号： G11B5/1272 , G11B5/02 , G11B5/3116 , G11B5/314 , G11B11/10536 , G11B2005/0002 , G11B2005/0021
摘要： The aim of the present invention is to apply an intense magnetic field to a portion where an optical near-field is generated by a thermal assisted magnetic recording head with a scatterer having conductivity as an optical near-field generating element. To this end, a scatterer for generating an optical near-field is formed in a bottom portion of a slider, and a magnetic field is applied thereto using a coil. In order to increase the intensity of the magnetic field, a magnetic pole made of a soft magnetic material is formed over the scatterer.
摘要翻译：本发明的目的是通过具有导电性的散射体作为光学近场产生元件的热辅助磁记录头，向产生光学近场的部分施加强磁场。为此，在滑块的底部形成用于产生光学近场的散射体，并且使用线圈向其施加磁场。为了增加磁场的强度，在散射体上形成由软磁性材料构成的磁极。

5. 发明申请

US20080049357A1 THERMALLY ASSISTED MAGNETIC RECORDING SYSTEM 有权
标题翻译：热辅助磁记录系统
公开(公告)号：US20080049357A1
公开(公告)日：2008-02-28
申请号：US11774350
申请日：2007-07-06
申请人： Fumiko Akagi , Takuya Matsumoto , Kimio Nakamura
发明人： Fumiko Akagi , Takuya Matsumoto , Kimio Nakamura
IPC分类号： G11B5/127
CPC分类号： G11B5/1278 , G11B2005/001 , G11B2005/0021
摘要： The optimum head-field intensity for saturation recording is assumed to be 560×103 A/m or more. Under a condition where the recording track width of an information recording medium is equal to or less than 60 nm, the optimum head-field intensity Y satisfies the following inequalities (1) and (2): Y≧(X2−119×X+4135)×1000 (1) Y≦(X2−119×X+const)×1000 (2) where X denotes the nondimensional value of the recording track width divided by 10−9 m, and Y denotes a magnetic field (expressed in units of A/m) which a magnetic pole for head-field application applies to the center of the information recording medium in the direction of the thickness thereof. Note that const=−0.8×v2+33.7×v+4250 if the relative velocity v between the head and the medium at the position of the head is less than 20 m/sec, or const=4600 if the velocity v is equal to or more than 20 m/sec.
摘要翻译：饱和记录的最佳头场强度假设为560×3×3 / m以上。在信息记录介质的记录磁道宽度等于或小于60nm的条件下，最佳磁头强度Y满足以下不等式（1）和（2）：<？in-line-formula description = “直线公式”end =“lead”？> Y> =（X <2> -119xX + 4135）x1000（1）<？in-line-formula description =“In-line Formulas” end =“tail”？> <？in-line-formula description =“In-line Formulas”end =“lead”？> Y <=（X ^{2 -119xX + const）x1000 ）<？in-line-formula description =“In-line Formulas”end =“tail”？>其中X表示记录磁道宽度的无量纲值除以10 -9 -9，Y 表示用于头场施加的磁极在信息记录介质的中心沿其厚度方向施加的磁场（以A / m为单位表示）。注意，如果头部和头部位置之间的头部和介质之间的相对速度v小于20 m / sec，则const = -0.8xv <2> + 33.7xv + 4250，或者const = 4600 if 速度v等于或大于20m / sec。}

6. 发明授权

US08130598B2 Head for thermal assisted magnetic recording device, and thermal assisted magnetic recording device 失效
标题翻译：热辅助磁记录装置头，热辅助磁记录装置
公开(公告)号：US08130598B2
公开(公告)日：2012-03-06
申请号：US11590785
申请日：2006-11-01
申请人： Takuya Matsumoto , Fumiko Akagi
发明人： Takuya Matsumoto , Fumiko Akagi
IPC分类号： G11B11/00
CPC分类号： G11B5/1272 , G11B5/02 , G11B5/3116 , G11B5/314 , G11B11/10536 , G11B2005/0002 , G11B2005/0021
摘要： The aim of the present invention is to apply an intense magnetic field to a portion where an optical near-field is generated by a thermal assisted magnetic recording head with a scatterer having conductivity as an optical near-field generating element. To this end, a scatterer for generating an optical near-field is formed in a bottom portion of a slider, and a magnetic field is applied thereto using a coil. In order to increase the intensity of the magnetic field, a magnetic pole made of a soft magnetic material is formed over the scatterer.
摘要翻译：本发明的目的是通过具有导电性的散射体作为光学近场产生元件的热辅助磁记录头，向产生光学近场的部分施加强磁场。为此，在滑块的底部形成用于产生光学近场的散射体，并且使用线圈向其施加磁场。为了增加磁场的强度，在散射体上形成由软磁性材料构成的磁极。

7. 发明授权

US06671116B2 Magnetic recording system including magnetic recording medium having three-dimensional random orientation of axis of easy magnetization 失效
公开(公告)号：US06671116B2
公开(公告)日：2003-12-30
申请号：US10044929
申请日：2002-01-15
申请人： Fumiko Akagi , Masukazu Igarashi , Kazuetsu Yoshida , Akira Ishikawa
发明人： Fumiko Akagi , Masukazu Igarashi , Kazuetsu Yoshida , Akira Ishikawa
IPC分类号： G11B502
CPC分类号： G11B5/012 , G11B5/64 , G11B5/82 , G11B2005/001
摘要： A magnetic recording system includes a magnetic recording medium including a magnetic layer, the magnetic layer being composed of magnetic grains, and a magnetic head including a recording unit and a reproducing unit. An orientation of an axis of easy magnetization of the magnetic grains is three-dimensionally distributed. An average angle between a direction of an axis of easy magnetization of each of the magnetic grains and a surface of the magnetic recording medium is within a range of 20° to 30°. A squareness ratio Mr/Ms of a remanent magnetization Mr of the magnetic recording medium to a saturation magnetization Ms of the magnetic recording medium is equal to 0.5 or more and is equal to 0.6 or less. A recording density of information which is recorded onto the magnetic recording medium is equal to 360 kfci or more.

8. 发明授权

US08089829B2 Thermally assisted recording media and system 失效
标题翻译：热辅助记录媒体和系统
公开(公告)号：US08089829B2
公开(公告)日：2012-01-03
申请号：US12608232
申请日：2009-10-29
申请人： Fumiko Akagi , Masukazu Igarashi , Hiroaki Nemoto , Takayuki Ichihara
发明人： Fumiko Akagi , Masukazu Igarashi , Hiroaki Nemoto , Takayuki Ichihara
IPC分类号： G11B11/00
CPC分类号： G11B5/82 , B82Y10/00 , G11B5/314 , G11B5/65 , G11B5/66 , G11B5/743 , G11B2005/0021
摘要： A thermally assisted magnetic recording medium includes a substrate and at least two, i.e., first and second magnetic recording layers. These layers are hard magnetic layers and contain magnetic grains and a non-magnetic substance magnetically segregating the magnetic grains at grain boundaries. The first magnetic recording layer has a magnetic anisotropy energy Ku1, a grain volume v1, and energy for maintaining its recording magnetization Ku1v1; the second magnetic recording layer has a magnetic anisotropy energy Ku2, a grain volume v2, and energy for maintaining its recording magnetization Ku2v2; and the ratio Ku1v1/kBT of Ku1v1 to a thermal fluctuation energy kBT, where kB represents a Boltzmann constant and T represents an absolute temperature, and the ratio Ku2v2/kBT of Ku2v2 to kBT satisfy the following conditions: Ku1v1/kBT is larger than Ku2v2/kBT at room temperature, but is smaller than Ku2v2/kBT at temperatures around the Curie temperature of the first magnetic recording layer.
摘要翻译：热辅助磁记录介质包括基底和至少两个，即第一和第二磁记录层。这些层是硬磁性层，并且含有磁性颗粒，并且非磁性物质在晶界处磁性地分离磁性颗粒。第一磁记录层具有磁各向异性能Ku1，晶粒体积v1和用于保持其记录磁化强度Ku1v1的能量; 第二磁记录层具有磁各向异性能Ku2，晶粒体积v2和用于保持其记录磁化Ku2v2的能量; Ku1v1 / kBT的Ku1v1 / kBT与热波动能kBT的比值，其中kB表示玻耳兹曼常数，T表示绝对温度，Ku2v2与kBT的Ku2v2 / kBT的比值满足以下条件：Ku1v1 / kBT大于Ku2v2 / kBT，但在第一磁记录层的居里温度附近的温度下小于Ku2v2 / kBT。

9. 发明授权

US07446969B2 Thermally assisted recording system 有权
标题翻译：热辅助记录系统
公开(公告)号：US07446969B2
公开(公告)日：2008-11-04
申请号：US11134088
申请日：2005-05-19
申请人： Fumiko Akagi , Masukazu Igarashi , Hideki Saga
发明人： Fumiko Akagi , Masukazu Igarashi , Hideki Saga
IPC分类号： G11B5/02
CPC分类号： G11B5/66 , G11B5/02 , G11B5/656 , G11B11/10536 , G11B11/10584 , G11B11/10586 , G11B2005/001 , G11B2005/0021 , H01F10/137 , H01F10/16
摘要： A thermally assisted magnetic recording system is provided to achieve excellent thermal resistance and low noise. In one embodiment, a magnetic recording medium is used, in which the magnetic intergrain exchange coupling is large to let the magnetization be thermally stable by coupling the magnetic grains constituting the recording layer at room temperature (the temperature maintaining the magnetization) and reduced by heating during recording to let the recording magnetization transition slope become steep. Parameter A normalizing the slope around the coercivity of the MH-loop of the medium is 1.5≦A
摘要翻译：提供热辅助磁记录系统以实现优异的耐热性和低噪音。在一个实施例中，使用磁记录介质，其中磁性颗粒间交换耦合大以通过在室温下（构成记录层的磁性颗粒）（保持磁化的温度）并通过加热而减小而使磁化热稳定在记录期间使记录磁化转变斜率变得陡峭。参数A围绕介质MH环的矫顽力的斜率标准化在室温下为1.5 <= A <6.0，加热时变为约1.0。

10. 发明申请

US20050259343A1 Thermally assisted recording system 有权
标题翻译：热辅助记录系统
公开(公告)号：US20050259343A1
公开(公告)日：2005-11-24
申请号：US11134088
申请日：2005-05-19
申请人： Fumiko Akagi , Masukazu Igarashi , Hideki Saga
发明人： Fumiko Akagi , Masukazu Igarashi , Hideki Saga
IPC分类号： G11B5/64 , G11B5/00 , G11B5/02 , G11B5/65 , G11B5/66 , G11B5/706 , H01F10/13 , H01F10/16 , G11B5/82
CPC分类号： G11B5/66 , G11B5/02 , G11B5/656 , G11B11/10536 , G11B11/10584 , G11B11/10586 , G11B2005/001 , G11B2005/0021 , H01F10/137 , H01F10/16
摘要： A thermally assisted magnetic recording system is provided to achieve excellent thermal resistance and low noise. In one embodiment, a magnetic recording medium is used, in which the magnetic intergrain exchange coupling is large to let the magnetization be thermally stable by coupling the magnetic grains constituting the recording layer at room temperature (the temperature maintaining the magnetization) and reduced by heating during recording to let the recording magnetization transition slope become steep. Parameter A normalizing the slope around the coercivity of the MH-loop of the medium is 1.5≦A
摘要翻译：提供热辅助磁记录系统以实现优异的耐热性和低噪声。在一个实施例中，使用磁记录介质，其中磁性颗粒间交换耦合大以通过在室温下（构成记录层的磁性颗粒）（保持磁化的温度）并通过加热而减小而使磁化热稳定在记录期间使记录磁化转变斜率变得陡峭。参数A围绕介质MH环的矫顽力的斜率标准化在室温下为1.5 <= A <6.0，加热时变为约1.0。

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