公开(公告)号：US5956296A

公开(公告)日：1999-09-21

申请号：US931369

申请日：1997-09-16

申请人： Masakuni Yamamoto ,  Eiichi Fujii ,  Tsutomu Shiratori

发明人： Masakuni Yamamoto ,  Eiichi Fujii ,  Tsutomu Shiratori

IPC分类号： G11B11/10 ,  G11B5/02 ,  G11B7/125 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10515 ,  G11B11/10543 ,  G11B5/02

摘要： An information reproducing apparatus for reproducing information by moving a magnetic wall along an information track on a recording medium. The apparatus includes an optical system for irradiating the recording medium with a light spot of an oval shape having a longer axis and a shorter axis, of which the longer axis is substantially parallel to the information track and a ratio of the longer axis to the shorter axis is at least 1.4, and a movement device for performing relative movement between the light spot and the recording medium.

摘要翻译： 一种信息再现装置，用于通过沿着记录介质上的信息轨道移动磁壁来再现信息。 该装置包括一个光学系统，用于向具有长轴和短轴的椭圆形光点照射记录介质，其长轴基本上平行于信息轨迹，并且长轴与较短轴的比率 轴至少为1.4，以及用于在光点和记录介质之间执行相对移动的移动装置。

公开(公告)号：US06249489B1

公开(公告)日：2001-06-19

申请号：US09141350

申请日：1998-08-27

申请人： Eiichi Fujii ,  Masakuni Yamamoto ,  Tsutomu Shiratori ,  Yasuyuki Miyaoka

发明人： Eiichi Fujii ,  Masakuni Yamamoto ,  Tsutomu Shiratori ,  Yasuyuki Miyaoka

IPC分类号： G11B1100

CPC分类号： G11B11/10508 ,  G11B11/10515 ,  G11B11/10528 ,  G11B11/10586

摘要： Disclosed herein is an information recording-reproducing method, wherein a domain wall is displaced on a recording medium in which information has been recorded, thereby conducting the reproduction of the information, the method comprising, projecting a light spot on the recording medium, relatively moving the light spot and the recording medium, applying a magnetic field modulated according to the information to the site projected by the light spot to form record marks the maximum mark length of which is at most 0.15 times the spot size of the light spot and displacing the domain wall from the front to the back of the moving direction of the light spot by a temperature distribution formed on the recording medium by the light spot, and at the same time detecting the displacement of the domain wall from reflected light of the light spot, thereby detecting the record marks.

摘要翻译： 这里公开了一种信息记录再现方法，其中域壁在已经记录信息的记录介质上移位，从而进行信息的再现，该方法包括：将光点投影在记录介质上，相对移动 光点和记录介质，将根据该信息调制的磁场施加到由光点投射的位置，以形成其最大标记长度为光斑大小的至多0.15倍的记录标记， 通过由光点在记录介质上形成的温度分布，从光斑的移动方向的前方到后方的畴壁，同时检测畴壁从光斑的反射光的位移， 从而检测记录标记。

公开(公告)号：US5936915A

公开(公告)日：1999-08-10

申请号：US931361

申请日：1997-09-16

申请人： Eiichi Fujii ,  Tsutomu Shiratori

发明人： Eiichi Fujii ,  Tsutomu Shiratori

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10515 ,  G11B11/10584 ,  G11B11/10586

摘要： A magneto-optical recording medium includes a first magnetic layer of which the magnetic wall moves and which contributes to reproduction, a third magnetic layer in which information is accumulated, and a second magnetic layer disposed between the first and third magnetic layers and having a lower Curie temperature than those of the first and third magnetic layers. The following is satisfied at the lowest temperature Ts whereat the exchange-coupling between the first and third magnetic layers is cut:.vertline.k1*d.sigma.w1/dT.vertline.>2*Ms1*Hw1>.vertline.k2*d.sigma.w1/dT.vertline..vertline.k1*d.sigma.w3/dT.vertline.

摘要翻译： 磁光记录介质包括磁壁移动并有助于再现的第一磁性层，其中积累信息的第三磁性层和设置在第一和第三磁性层之间并具有较低的第二磁性层的第二磁性层 居里温度高于第一和第三磁性层的居里温度。 在最低温度Ts下满足以下条件：切割第一和第三磁性层之间的交换耦合：| k1 * d sigma w1 / dT |> 2 * Ms1 * Hw1> | k2 * d sigma w1 / dT || k1 * d sigma w3 / dT | <2 * Ms3 * Hw3其中T表示由cgs单位系统表示的温度; sigma w1，Ms1和Hw1分别表示由cgs单位系统表示的第一磁性层的磁壁能量密度，饱和磁化强度和磁壁矫顽力; sigma rw3，Ms3，Hw3分别表示由cgs单位系统表示的第三磁性层的磁壁能量密度，饱和磁化强度和磁壁矫顽力; 并且k1和k2分别表示形成在介质上的温度分布的一个和另一个温度梯度。

公开(公告)号：US06345016B1

公开(公告)日：2002-02-05

申请号：US09144473

申请日：1998-08-31

申请人： Tsutomu Shiratori

发明人： Tsutomu Shiratori

IPC分类号： G11B1100

CPC分类号： G11B11/10515 ,  G11B11/10586 ,  G11B11/10593

摘要： A signal reproducing method for reproducing information by domain wall displacement on a recording medium having recorded information comprises steps of projecting a light spot onto the recording medium to cause temperature distribution thereon, moving relatively the light spot and the recording medium, applying a reproducing magnetic field to the light spot area on the recording medium to prevent displacement of the domain wall from the rear portion of the moving light spot into the inside thereof, and detecting the domain wall displacement to reproduce the information. The temperature gradient may satisfy the relation below: |G1|>|G2| where G1 is the temperature gradient in the front portion in the moving direction, and G2 is the temperature gradient in the rear portion in the moving direction. The recording medium has a first magnetic layer enabling displacement of the domain wall, a third magnetic layer for memorizing information, and a second magnetic layer provided between the first magnetic layer and the third magnetic layer, and having a Curie temperature lower than the Curie temperature temperatures of the first magnetic layer and the third magnetic layer.

摘要翻译： 一种用于在具有记录信息的记录介质上通过域壁位移再现信息的信号再现方法包括以下步骤：将光斑投射到记录介质上以引起温度分布，相对于光点和记录介质移动，施加再现磁场 到记录介质上的光点区域，以防止畴壁从移动光点的后部移动到其内部，并且检测畴壁位移以再现信息。 温度梯度可以满足以下关系：其中G1是运动方向前部的温度梯度，G2是运动方向后部的温度梯度。 记录介质具有能够使畴壁移位的第一磁性层，用于存储信息的第三磁性层和设置在第一磁性层和第三磁性层之间的第二磁性层，并且居里温度低于居里温度 第一磁性层和第三磁性层的温度。

公开(公告)号：US06265062B1

公开(公告)日：2001-07-24

申请号：US08933091

申请日：1997-09-18

申请人： Tsutomu Shiratori

发明人： Tsutomu Shiratori

IPC分类号： G11B566

CPC分类号： G11B11/10515 ,  G11B5/66 ,  G11B11/10528 ,  G11B11/10586 ,  Y10S428/90 ,  Y10T428/12771 ,  Y10T428/24942 ,  Y10T428/26 ,  Y10T428/265

摘要： A magnetic recording medium comprising first, second and third magnetic layers laminated in succession, wherein when (1) the magnetic wall energy density, saturation magnetization, magnetic wall coercivity and film thickness of the first magnetic layer at a temperature T represented by cgs unit system are defined as &sgr;1, Ms1, Hw1 (2) h1, respectively, and the magnetic wall energy density, saturation magnetization, magnetic wall coercivity and film thickness of the third magnetic layer are defined as &sgr;3, Ms3, Hw3 and h3, respectively, (3) the interface magnetic wall energy density between the first magnetic layer and the third magnetic layer is defined as &sgr;w13, and (4) the lowest temperature at which &sgr;w13 is 0 erg/cm2 is Ts, at least 2Ms1*Hw1 &sgr;w13/h3  are satisfied, at room temperature and when a suitable temperature Tp is chosen, within a temperature range greater than the temperature Ts and lower by 10° C. or more than the Curie temperature Tc1 of the first magnetic layer, within a temperature range of about Ts to Tp, k1 ⁡ ( T ) 0.2 × 10 - 4  are satisfied, where k1(T)=(2Ms1*Hw1+&sgr;w13/h1)/|d&sgr;1/dT| k3(T)=(2Ms3*Hw3−&sgr;w13/h3)/|d&sgr;3/dT|.

摘要翻译： 一种包括依次层叠的第一，第二和第三磁性层的磁记录介质，其中当（1）由cgs单元系统表示的温度T时第一磁性层的磁壁能量密度，饱和磁化强度，磁壁矫顽力和膜厚度 分别定义为σ1，Ms1，Hw1（2）h1，第三磁性层的磁壁能量密度，饱和磁化强度，磁壁矫顽力和膜厚分别定义为σ3，Ms3，Hw3和h3（ 3）第一磁性层和第三磁性层之间的界面磁壁能量密度定义为sigmaw13，（4）sigmaw13为0erg / cm2时的最低温度为Ts，至少满足室温 并且当选择合适的温度Tp时，在大于温度Ts并且低于10℃或更高于第一磁性层的居里温度Tc1的温度范围内， 大约Ts到Tp的特征范围是满足的，其中

公开(公告)号：US06221219B1

公开(公告)日：2001-04-24

申请号：US09406692

申请日：1999-09-27

申请人： Morimi Hashimoto ,  Tsutomu Shiratori

发明人： Morimi Hashimoto ,  Tsutomu Shiratori

IPC分类号： C23C1434

CPC分类号： G11B11/10584 ,  G11B11/10515 ,  G11B11/10582 ,  G11B11/10591 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/24942

摘要： A magneto-optical medium comprises a light-transmissive substrate, a third magnetic layer formed on the light-transmissive substrate, a first magnetic layer formed on the light-transmissive substrate, the first magnetic layer having lower domain wall coercivity and allowing higher domain wall mobility than the third magnetic layer at or around an ambient temperature and a second magnetic layer held between the first magnetic layer and the third magnetic layer, the second magnetic layer having a Curie temperature lower than that of the first magnetic layer and the third magnetic layer, wherein the surface roughness, Ra(d), of the first magnetic layer is smaller than the surface roughness, Ra(m), of the third magnetic layer.

摘要翻译： 磁光介质包括透光基板，形成在透光基板上的第三磁性层，形成在透光基板上的第一磁性层，第一磁性层具有较低的畴壁矫顽力，并允许较高的畴壁 在环境温度或环境温度附近的第三磁性层的迁移率和保持在第一磁性层和第三磁性层之间的第二磁性层，第二磁性层的居里温度低于第一磁性层和第三磁性层的居里温度 ，其中所述第一磁性层的表面粗糙度Ra（d）小于所述第三磁性层的表面粗糙度Ra（m）。

公开(公告)号：US06197440B1

公开(公告)日：2001-03-06

申请号：US09418834

申请日：1999-10-15

申请人： Tsutomu Shiratori

发明人： Tsutomu Shiratori

IPC分类号： G11B566

CPC分类号： G11B11/10541 ,  G11B11/10593 ,  Y10S428/90 ,  Y10S428/928 ,  Y10T428/12333 ,  Y10T428/12653

摘要： A magnetic recording medium comprises a stack of four magnetic layers. The first magnetic layer 11 is a layer for reproducing information recorded on the medium. The third magnetic layer 13 is a storage layer for storing information recorded on the medium in the form of domain walls. The second magnetic layer 12 has a lower Curie temperature Ts than the first and third magnetic layers and is interposed between the first and third magnetic layers. The fourth magnetic layer 14 is interposed between the first 11 and second 12 magnetic layers, and has a larger domain wall energy density than that of the first magnetic layer 11.

摘要翻译： 磁记录介质包括四层磁性层的叠层。 第一磁性层11是用于再现记录在介质上的信息的层。 第三磁性层13是用于存储以畴壁形式记录在介质上的信息的存储层。 第二磁性层12具有比第一和第三磁性层低的居里温度Ts，并且介于第一和第三磁性层之间。 第四磁性层14介于第一磁性层11和第二磁性层12之间，并且具有比第一磁性层11更大的畴壁能量密度。

公开(公告)号：US6084830A

公开(公告)日：2000-07-04

申请号：US931362

申请日：1997-09-16

申请人： Takaaki Ashinuma ,  Tsutomu Shiratori

发明人： Takaaki Ashinuma ,  Tsutomu Shiratori

IPC分类号： G11B11/10 ,  G11B5/00 ,  G11B11/105 ,  G11B20/10 ,  G11B11/00

CPC分类号： G11B20/10009 ,  G11B11/10515 ,  G11B5/00

摘要： A micro mark on a magnetic recording medium is reproduced in a signal reproducing apparatus by causing a magnetic wall to move on the recording medium. A partial temperature profile is applied on the medium by a heating device which is adapted to be movable relative to the medium. A reproducing device generates a first reproduction signal containing a signal component due to a first magnetic wall movement from a front side of a temperature peak position in the temperature profile toward the temperature peak position and a signal component due to a second magnetic wall movement from a rear side of the temperature peak position toward the temperature peak position. The signal component due to the second magnetic wall movement is reduced in the reproduction signal so as to generate a second reproduction signal which mainly contains the signal component due to the first magnetic wall movement.

摘要翻译： 通过使磁性壁在记录介质上移动，在信号再现装置中再现磁记录介质上的微标记。 通过适于相对于介质可移动的加热装置在介质上施加局部温度分布。 再现装置产生第一再现信号，该第一再现信号包含由温度分布图中的温度峰值位置的前侧朝向温度峰值位置的第一磁性壁移动的信号分量，以及由于来自第二磁性壁移动的信号分量 温度峰值位置的后侧朝向温度峰值位置。 由于第二磁性壁移动引起的信号分量在再现信号中减小，从而产生主要包含由于第一磁壁移动引起的信号分量的第二再现信号。

公开(公告)号：US5450382A

公开(公告)日：1995-09-12

申请号：US232581

申请日：1994-04-25

申请人： Tsutomu Shiratori

发明人： Tsutomu Shiratori

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B5/02 ,  G11B11/00

CPC分类号： G11B11/10515 ,  G11B11/10586

摘要： A magneto-optical recording medium has at least a first magnetic layer and a second magnetic layer which are mutually exchange-coupled. The first magnetic layer has a compensation temperature within a range higher than a room temperature but lower than the Curie temperature of the second magnetic layer. Under the application of an external magnetic field of a suitable intensity to the recording medium, the magnetization of the first magnetic layer is oriented in a stable direction with respect to the external magnetic field at the room temperature. At the vicinity of the compensation temperature of the first magnetic layer, the magnetization of the first magnetic layer is oriented in a stable direction with respect to the exchanging-coupling with the second magnetic layer. The second magnetic layer maintains a predetermined magnetization state at any temperature from the room temperature to the compensation temperature of the first magnetic layer regardless of the presence or absence of the external magnetic field.

摘要翻译： 磁光记录介质具有相互交换耦合的至少第一磁性层和第二磁性层。 第一磁性层具有在比室温高但低于第二磁性层的居里温度的范围内的补偿温度。 在对记录介质施加适当强度的外部磁场的情况下，第一磁性层的磁化在室温下相对于外部磁场的方向取向稳定。 在第一磁性层的补偿温度附近，相对于与第二磁性层的交换耦合，第一磁性层的磁化取向于稳定的方向。 第二磁性层在从室温到第一磁性层的补偿温度的任何温度下保持预定的磁化状态，而与外部磁场的存在或不存在无关。

公开(公告)号：US06454915B1

公开(公告)日：2002-09-24

申请号：US09693877

申请日：2000-10-23

申请人： Tsutomu Shiratori ,  Kazuoki Hongu

发明人： Tsutomu Shiratori ,  Kazuoki Hongu

IPC分类号： C23C1434

CPC分类号： G11B5/74 ,  G11B7/007 ,  G11B7/24 ,  G11B7/26 ,  G11B11/10582 ,  G11B11/10584 ,  G11B11/10586 ,  Y10S428/90 ,  Y10T428/24355

摘要： In a method of producing an information recording medium, any recording film is not substantially formed on the slope portions of a substrate in which slope portions having surfaces non-parallel to the surface of the information track of an information recording medium are provided on the opposite sides of the information track. A recording film of a predetermined film thickness is formed on the information track.

摘要翻译： 在制造信息记录介质的方法中，在基板的倾斜部分上基本没有形成任何记录膜，其中在与其相反的信息记录介质的信息轨道的表面不平行的表面的倾斜部分 信息轨道的两侧。 在信息轨道上形成预定膜厚的记录膜。