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1. 发明授权

US06456448B1 Magnetic recording system including magnetic recording medium having three-dimensional random orientation of axis of easy magnetization 失效
标题翻译：磁记录系统包括磁记录介质，其具有易磁化轴的三维随机取向
公开(公告)号：US06456448B1
公开(公告)日：2002-09-24
申请号：US09435036
申请日：1999-11-05
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 which can suppress an influence by a thermal fluctuation and is suitable for the high density magnetic recording in which excellent S/N ratio and resolution are obtained is provided. There is provided a magnetic recording system constructed by: a magnetic recording medium having a magnetic layer formed on a substrate through an underlayer; a driving unit for driving the medium in the recording direction; a magnetic head constructed by a recording unit and a reproducing unit; an apparatus for relatively moving the magnetic head to the magnetic recording medium; and a recording reproduction signal processing apparatus for performing a signal input to the magnetic head and an output signal reproduction from the magnetic head, wherein the reproducing unit of the magnetic head is constructed by a magneto-resistance effect type head and the system has a recording magnetization pattern in which a magnetization transition length of the magnetic recording medium is equal to 70 nm or less, the direction of an axis of easy magnetization of the magnetic particles in the magnetic layer of the magnetic recording medium is three-dimensionally oriented. Even after the elapse of 100 hours after the recording and at a linear recording density of 360 kfci, a reproduction output hardly decreases. A degree of deterioration of the S/N ratio of the output to the noises and the resolution are smaller than that of the conventional system.
摘要翻译：能够抑制热波动的影响的磁记录系统，适用于获得优异的S / N比和分辨率的高密度磁记录。提供一种磁记录系统，其通过以下方式构成：磁记录介质，其具有通过底层在基板上形成的磁性层; 用于在记录方向上驱动介质的驱动单元; 由记录单元和再现单元构成的磁头; 用于将磁头相对移动到磁记录介质的装置; 以及用于执行向磁头输入的信号和从磁头再现的输出信号的记录再现信号处理装置，其中磁头的再现单元由磁阻效应型磁头构成，并且系统具有记录磁记录介质的磁化转变长度等于或小于70nm的磁化模式，磁记录介质的磁性层中的磁性颗粒容易磁化的轴的方向是三维取向的。即使在记录100小时后，线性记录密度为360kfci，再现输出几乎不降低。输出与噪声的S / N比和分辨率的劣化程度小于常规系统的劣化程度。

2. 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.

3. 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。

4. 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。

5. 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。

6. 发明授权

US07813071B2 Thermally assisted recording system 有权
标题翻译：热辅助记录系统
公开(公告)号：US07813071B2
公开(公告)日：2010-10-12
申请号：US12287010
申请日：2008-10-02
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。参数使围绕介质MH环的矫顽力的斜率标准化为1.5＆nlE;室温下A <6.0，加热约为1.0。

7. 发明申请

US20090040646A1 Thermally assisted recording system 有权
标题翻译：热辅助记录系统
公开(公告)号：US20090040646A1
公开(公告)日：2009-02-12
申请号：US12287010
申请日：2008-10-02
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。

8. 发明授权

US06635367B2 Magnetic recording medium 有权
公开(公告)号：US06635367B2
公开(公告)日：2003-10-21
申请号：US09941798
申请日：2001-08-30
申请人： Masukazu Igarashi , Fumiko Akagi , Hideki Zaitsu , Futoshi Tomiyama
发明人： Masukazu Igarashi , Fumiko Akagi , Hideki Zaitsu , Futoshi Tomiyama
IPC分类号： G11B566
CPC分类号： G11B5/66 , Y10S428/90 , Y10T428/24942
摘要： An object is to provide a magnetic recording medium giving high resolution, low noise and little thermal fluctuation and thus suitable for high density magnetic recording, and a high-capacity magnetic recording device realized by using this medium. A thin film type magnetic recording medium is used, having at least 2 magnetic layers formed on a non-magnetic substrate and a non-magnetic intermediate layer that is interposed between the magnetic layers and causes the magnetizations of the magnetic layers to be anti-parallel to one another, and wherein the ratio HkB/HkA of the anisotropic magnetic field strength HkB of the magnetic layer on the side near to the substrate to the anisotropic magnetic field strength HkA of the magnetic layer on the side far from the substrate is 0.7 or less, more preferably at least 0.4 and not more than 0.65.

9. 发明授权

US06728051B2 Recording equalizer and magnetic recording/reproducing apparatus using the equalizer 有权
标题翻译：使用均衡器的记录均衡器和磁记录/再现装置
公开(公告)号：US06728051B2
公开(公告)日：2004-04-27
申请号：US10388466
申请日：2003-03-17
申请人： Masukazu Igarashi , Yohji Maruyama , Kazuetsu Yoshida , Ikuo Saitoh
发明人： Masukazu Igarashi , Yohji Maruyama , Kazuetsu Yoshida , Ikuo Saitoh
IPC分类号： G11B509
CPC分类号： G11B20/10055 , G11B5/035 , G11B5/09 , G11B20/10009 , G11B20/10194 , G11B20/14 , G11B2005/001 , G11B2005/0016 , G11B2020/10981
摘要： A recording equalizer for correcting a write timing of magnetic information when the magnetic information is recorded with a magnetic recording head on a magnetic recording medium, includes a buffer for storing a recording object bit and bits before and after the recording object bit and a calculator for calculating a precompensation parameter using the bits stored in the buffer. The calculator calculates the preconpensation parameter of the recording object bit by linearly adding influence of a transition existing at a two-previous bit of the recording object bit, influences of a transition at a one-previous bit of the recording object bit and influences of a transition existing at one-following bit of the recording object bit and further adding an offset. The offset is determined to a value such that a write timing of the magnetic information is corrected always in a delaying direction.
摘要翻译：当在磁记录介质上用磁记录头记录磁信息时，用于校正磁信息的写定时的记录均衡器包括：用于存储记录对象位的缓冲器和记录对象位之前和之后的位;以及计算器，使用存储在缓冲器中的位来计算预补偿参数。计算器通过线性地添加存在于记录对象位的前两位的转变的影响，记录对象位的前一位的转变的影响和影响的影响来计算记录对象位的前置补偿参数存在于记录对象位的一个后续位的转换，并进一步添加偏移。偏移被确定为使得磁信息的写入定时总是以延迟方向校正的值。

10. 发明授权

US06549355B2 Recording equalizer and magnetic recording/reproducing apparatus using the equalizer 有权
标题翻译：使用均衡器的记录均衡器和磁记录/再现装置
公开(公告)号：US06549355B2
公开(公告)日：2003-04-15
申请号：US10231089
申请日：2002-08-30
申请人： Masukazu Igarashi , Yohji Maruyama , Kazuetsu Yoshida , Ikuo Saitoh
发明人： Masukazu Igarashi , Yohji Maruyama , Kazuetsu Yoshida , Ikuo Saitoh
IPC分类号： G11B509
CPC分类号： G11B20/10055 , G11B5/035 , G11B5/09 , G11B20/10009 , G11B20/10194 , G11B20/14 , G11B2005/001 , G11B2005/0016 , G11B2020/10981
摘要： A recording equalizer for correcting a write timing of magnetic information when the magnetic information is recorded with a magnetic recording head on a magnetic recording medium, includes a buffer for storing a recording object bit and bits before and after the recording object bit and a calculator for calculating a precompensation parameter using the bits stored in the buffer. The calculator calculates the precompensation parameter of the recording object bit by linearly adding influence of a transition existing at a two-previous bit of the recording object bit, influences of a transition at a one-previous bit of the recording object bit and influences of a transition existing at one-following bit of the recording object bit and further adding an offset. The offset is determined to a value such that a write timing of the magnetic information is corrected always in a delaying direction.
摘要翻译：当在磁记录介质上用磁记录头记录磁信息时，用于校正磁信息的写定时的记录均衡器包括：用于存储记录对象位的缓冲器和记录对象位之前和之后的位;以及计算器，使用存储在缓冲器中的位来计算预补偿参数。计算器通过线性地添加存在于记录对象位的两个先前位的转变的影响，记录对象位的前一位的转变的影响以及a的前一位的影响来计算记录对象位的预补偿参数存在于记录对象位的一个后续位的转换，并进一步添加偏移。偏移被确定为使得磁信息的写入定时总是以延迟方向校正的值。

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