公开(公告)号：US06804822B2

公开(公告)日：2004-10-12

申请号：US10132775

申请日：2002-04-25

申请人： Junichi Sato ,  Kosuke Watanabe ,  Kunio Kojima ,  Hiroyuki Katayama ,  Hiroshi Fuji ,  Kenji Ohta

发明人： Junichi Sato ,  Kosuke Watanabe ,  Kunio Kojima ,  Hiroyuki Katayama ,  Hiroshi Fuji ,  Kenji Ohta

IPC分类号： G11B724

CPC分类号： G11B5/7325 ,  G11B5/012 ,  G11B5/74 ,  G11B5/82 ,  G11B11/10508 ,  G11B11/10584 ,  G11B11/10591 ,  G11B2005/0005 ,  G11B2005/0021

摘要： A magnetic recording medium, which includes a substrate and an amorphous magnetic layer, made of an amorphous magnetic material, for magnetic recording of data, is provided with an underlayer between the substrate and the amorphous magnetic layer, the underlayer being made of amorphous metal element, and having a mean thickness of 10 nm or less. In this manner, movement of magnetic domain walls of the amorphous magnetic layer is effectively limited by minute irregularities on a surface of the underlayer. This realizes a stable formation of a minute recording mark. This realizes recording having a sufficient signal quality, even when the high-density recording is performed by forming such a minute recording mark that a shortest length of the recording mark is less than 100 nm. Moreover, this allows the magnetic recording medium to have a simplified layer structure. Further, a magnetic recording apparatus magnetically records data onto a magnetic recording medium having the above arrangement, by heating a portion of the magnetic layer by radiating a light beam locally, and by applying a magnetic field on at least part of the portion of the magnetic layer on which the light beam is radiated. This provides a magnetic recording apparatus for high-density recording.

摘要翻译： 包括由非晶磁性材料制成的用于磁记录数据的基板和非晶磁性层的磁记录介质在基板和非晶磁性层之间设置有底层，底层由非晶金属元件 平均厚度为10nm以下。 以这种方式，非晶磁性层的磁畴壁的运动被有效地限制在底层表面上的微小凹凸。 这实现了一个稳定的分钟记录标记的形成。 这实现了具有足够的信号质量的记录，即使当通过形成记录标记的最短长度小于100nm的这种微小记录标记来执行高密度记录时。 此外，这允许磁记录介质具有简化的层结构。 此外，磁记录装置将数据磁记录到具有上述结构的磁记录介质上，通过局部辐射光束加热磁性层的一部分，并且通过在磁体的至少一部分上施加磁场 光束辐射的层。 这提供了用于高密度记录的磁记录装置。

公开(公告)号：US06876603B2

公开(公告)日：2005-04-05

申请号：US09864060

申请日：2001-05-23

申请人： Hiroshi Fuji ,  Hiroyuki Katayama ,  Kunio Kojima ,  Kenji Ohta

发明人： Hiroshi Fuji ,  Hiroyuki Katayama ,  Kunio Kojima ,  Kenji Ohta

IPC分类号： G11B11/10 ,  G11B5/00 ,  G11B5/02 ,  G11B5/127 ,  G11B13/04 ,  G11B21/10 ,  G11B11/00

CPC分类号： G11B5/127 ,  G11B13/045 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021

摘要： An information write/read head writes or reads information on or from recording tracks by the heat-assisted system. The information write/read head includes a magnetic head provided in such a manner that a longitudinal direction of a magnetic gap crosses a scanning direction. Further, the information write/read head includes an aperture slit having a length of not less than a diffraction limit of a light beam, and a width shorter than the diffraction limit in the direction orthogonal to the recording track, which is formed in such a manner that the longitudinal direction thereof is aligned in a scanning direction of the recording track.

摘要翻译： 信息写入/读取头通过热辅助系统在记录轨道上或从记录轨迹读取信息。 信息写入/读取头包括以使得磁隙的纵向方向与扫描方向交叉的方式设置的磁头。 此外，信息写入/读取头包括具有不小于光束的衍射极限的长度的孔径狭缝，并且其宽度比在与记录轨道正交的方向上的衍射极限短， 使得其纵向方向在记录轨道的扫描方向上对齐。

公开(公告)号：US5546364A

公开(公告)日：1996-08-13

申请号：US311452

申请日：1994-09-26

申请人： Hiroshi Fuji ,  Toshihisa Deguchi ,  Kunio Kojima ,  Takeshi Yamaguchi ,  Shigeo Terashima ,  Akira Takahashi ,  Kenji Ohta

发明人： Hiroshi Fuji ,  Toshihisa Deguchi ,  Kunio Kojima ,  Takeshi Yamaguchi ,  Shigeo Terashima ,  Akira Takahashi ,  Kenji Ohta

IPC分类号： G11B7/0045 ,  G11B7/005 ,  G11B7/013 ,  G11B11/105 ,  G11B13/04 ,  G11B7/12 ,  G11B11/12

CPC分类号： G11B7/24085 ,  G11B11/10504 ,  G11B11/10515 ,  G11B11/10528 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/013

摘要： A magneto-optical memory apparatus for enhancing the recording density of a magneto-optical recording medium, thereby to increase its recording capacity. The magneto-optical recording medium having recording marks, each having two ends in which information is recorded. The apparatus also includes an optical head arranged such that at the time of recording onto the magneto-optical recording medium, the recording marks are recorded such that the ends of each recording mark correspond to a second code of digital information composed of two different types of codes; at the time of reproduction, a light beam having a condensing spot is projected to the magneto-optical recording medium and, when a reproduction light containing reproduction information is entered to the optical head from the magneto-optical recording medium, a reproduction signal is supplied; and when the light beam is projected to a recording mark, an information pulse corresponding to the second code is generated in the reproduction signal, only when the reproduction light from the recording mark interferes with the reproduction light from the non-marking part; and a signal detector circuit for detecting the information pulse in the reproduction signal obtained from the optical head and for converting the reproduction signal into a digital reproduction signal.

摘要翻译： 一种用于增强磁光记录介质的记录密度的磁光存储装置，从而提高其记录容量。 具有记录标记的磁光记录介质，每个记录标记具有记录信息的两端。 该装置还包括一个光学头，其被配置为使得在记录到磁光记录介质上时，记录标记被记录为使得每个记录标记的端部对应于由两种不同类型的 代码; 在再现时，将具有聚光点的光束投影到磁光记录介质，并且当从磁光记录介质将包含再现信息的再现光输入到光头时，提供再现信号 ; 并且当光束投射到记录标记时，只有当来自记录标记的再现光干扰来自非标记部分的再现光时，才在再现信号中产生与第二代码相对应的信息脉冲; 以及信号检测器电路，用于检测从光头获得的再现信号中的信息脉冲，并将再现信号转换成数字再现信号。

公开(公告)号：US06661745B1

公开(公告)日：2003-12-09

申请号：US09537235

申请日：2000-03-28

申请人： Junji Tominaga ,  Nobufumi Atoda ,  Hiroshi Fuji ,  Hiroyuki Katayama ,  Kenji Ohta

发明人： Junji Tominaga ,  Nobufumi Atoda ,  Hiroshi Fuji ,  Hiroyuki Katayama ,  Kenji Ohta

IPC分类号： G11B700

CPC分类号： B82Y10/00 ,  G11B7/1387 ,  G11B7/24065 ,  G11B11/10584 ,  G11B11/10586

摘要： An optical device and a recording medium are provided with a recording layer for recording information by radiation of light, and a mask layer which is formed closely to the recording layer, reduces its transmittance of light due to light or heat, and transmits light to the recording layer by using a near-field effect. An optical reproducing and recording method includes the steps of: emitting a laser beam onto the mask layer, generating a near field around an area of the mask layer that has transmittance being reduced by the laser beam, and reproducing or recording optical information in the recording layer by interaction between the near field and the recording layer. With this method, it is possible to provide the optical device, recording medium, and optical reproducing and recording method that can realize a high S/N ratio upon reproducing and recording and that can readily form a recording mark.

摘要翻译： 光学器件和记录介质设置有用于通过照射光来记录信息的记录层和与记录层紧密相邻形成的掩模层，减少其由于光或热导致的光的透射率，并将光透射到 记录层通过使用近场效应。 光学再现和记录方法包括以下步骤：将激光束发射到掩模层上，产生围绕掩模层的区域的近场，该区域具有通过激光束减少的透射率，以及在记录中再现或记录光学信息 通过近场和记录层之间的相互作用来形成层。 利用这种方法，可以提供在再现和记录时可以实现高S / N比并且可以容易地形成记录标记的光学设备，记录介质和光学再现和记录方法。

公开(公告)号：US06819648B1

公开(公告)日：2004-11-16

申请号：US09585554

申请日：2000-06-02

申请人： Junji Tominaga ,  Nobufumi Atoda ,  Hiroshi Fuji ,  Hiroyuki Katayama ,  Kenji Ohta

发明人： Junji Tominaga ,  Nobufumi Atoda ,  Hiroshi Fuji ,  Hiroyuki Katayama ,  Kenji Ohta

IPC分类号： G11B700

CPC分类号： G11B7/252 ,  B82Y10/00 ,  G11B7/24065 ,  G11B7/243 ,  G11B7/2534 ,  G11B2007/25706 ,  G11B2007/2571 ,  G11B2007/25715 ,  G11B2007/25716

摘要： An optical sample includes a mask layer made of a material in which an aperture is produced by a chemical change, which is reversible, upon application of heat or light, and a recording layer provided at a position where an evanescent field produced in the aperture when light is applied to the mask layer can reach. Since the aperture is produced in the mask layer by a chemical change, it can be opened and closed at a high speed and hence a high-speed transfer of information can be achieved.

摘要翻译： 光学样品包括掩模层，其由其中通过化学变化产生孔的材料制成，其在施加热或光时是可逆的，以及设置在在孔中产生的ev逝场的位置处的记录层， 光应用于掩模层可以达到。 由于通过化学变化在掩模层中产生孔径，所以可以高速地打开和关闭孔，因此可以实现高速的信息传递。

公开(公告)号：US5962126A

公开(公告)日：1999-10-05

申请号：US975517

申请日：1997-11-20

申请人： Michinobu Mieda ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

发明人： Michinobu Mieda ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B5/66

CPC分类号： G11B11/10515 ,  G11B11/10586 ,  Y10S428/90 ,  Y10T428/26

摘要： The invention features an apparatus and method for reproducing recorded bits from a magneto-optical recording medium. The medium includes a base, a readout layer formed on the base, a transfer layer formed on the readout layer and a recording layer formed on the transfer layer. The readout and recording layers each exhibit perpendicular magnetization in a temperature range between room temperature and, respectively, the readout layer's Curie temperature and the recording layer's Curie temperature. The transfer layer is predominant in-plane magnetization at room temperature and an in-plane to perpendicular magnetization transition occurs at a temperature above room temperature. Also, the recording layer Curie temperature is lower than the Curie temperature of the transfer layer. The reproducing method includes the steps of projecting a light beam, applying a subsidiary magnetic field and reproducing information based on reflected light from the readout layer while applying the subsidiary magnetic field. The light beam is projected onto the readout layer from the side of the base so the in-plane to perpendicular magnetization transition occurs in a portion of the transfer layer, the portion corresponding to a central portion of the light beam spot. The intensity of the subsidiary magnetic field is higher than the coercive force of the readout layer and less than the exchange coupling force exerted from the recording-layer and the transfer layer to the readout layer.

摘要翻译： 本发明的特征在于一种用于从磁光记录介质再现记录位的装置和方法。 介质包括基底，形成在基底上的读出层，形成在读出层上的转印层和形成在转印层上的记录层。 读出和记录层各自在室温和读出层的居里温度和记录层的居里温度之间的温度范围内呈现垂直磁化强度。 转移层在室温下是主要的面内磁化，并且在高于室温的温度下发生面内到垂直磁化转变。 此外，记录层居里温度低于转印层的居里温度。 再现方法包括以下步骤：投射光束，施加辅助磁场，并且在施加辅助磁场的同时基于来自读出层的反射光再现信息。 光束从基底侧投射到读出层上，因此在转移层的一部分中发生垂直磁化转变，该部分对应于光束点的中心部分。 辅助磁场的强度高于读出层的矫顽力，并且小于从记录层和转印层施加到读出层的交换耦合力。

公开(公告)号：US5719831A

公开(公告)日：1998-02-17

申请号：US768794

申请日：1996-12-18

申请人： Junichiro Nakayama ,  Michinobu Mieda ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

发明人： Junichiro Nakayama ,  Michinobu Mieda ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B23/03 ,  G11B11/00

CPC分类号： G11B23/0321 ,  G11B11/10552 ,  G11B23/03

摘要： A magneto-optical disk cartridge includes a magnet which is magnetized substantially parallel to a surface of a magneto-optical disk for generating an initializing magnetic field. This structure permits a reduction in the thickness of the magneto-optical disk cartridge.

摘要翻译： 磁光盘盒包括磁体，该磁体基本上平行于磁光盘的表面而被磁化，用于产生初始化磁场。 这种结构允许减小磁光盘盒的厚度。

公开(公告)号：US5691963A

公开(公告)日：1997-11-25

申请号：US744565

申请日：1996-11-06

申请人： Junji Hirokane ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

发明人： Junji Hirokane ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

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

CPC分类号： G11B11/10515 ,  G11B11/10521 ,  G11B11/10591 ,  Y10S428/90 ,  Y10T428/12736 ,  Y10T428/12771 ,  Y10T428/12868 ,  Y10T428/12896 ,  Y10T428/12903 ,  Y10T428/1291 ,  Y10T428/12917 ,  Y10T428/12924 ,  Y10T428/12931 ,  Y10T428/12937 ,  Y10T428/26 ,  Y10T428/265

摘要： A magneto-optical recording medium including a base; a readout layer formed on the base; a recording layer formed on the readout layer; and an auxiliary recording layer formed on the recording layer, each of the readout layer, recording layer and auxiliary recording layer being made of an alloy of rare-earth metal and transition metal showing ferrimagnetism. The alloy composition of each layer is determined so that the recording layer has a Curie temperature lower than Curie temperatures of the readout layer and the auxiliary recording layer and has a coercive force higher than coercive forces of the readout layer and the auxiliary recording layer at room temperature and that, when the temperature of the recording layer is raised to near its Curie temperature while perpendicularly applying a uniform recording magnetic field to each layer, a sublattice magnetic moment of the rare-earth metal of the readout layer and a sublattice magnetic moment of the rare-earth metal of the auxiliary recording layer are antiparallel to each other. And, a method of recording information on the magneto-optical recording medium. This structure enables overwriting by light-intensity modulation without using an initializing magnetic field.

摘要翻译： 一种包括基底的磁光记录介质; 形成在基底上的读出层; 形成在读出层上的记录层; 以及形成在记录层上的辅助记录层，每个读出层，记录层和辅助记录层由稀土金属和过渡金属的合金制成，显示出铁磁性。 确定每层的合金组成，使得记录层的居里温度低于读出层和辅助记录层的居里温度，并且具有高于室内读出层和辅助记录层的矫顽力的矫顽力 并且当在每个层垂直地施加均匀的记录磁场的同时将记录层的温度升高到靠近其居里温度时，读出层的稀土金属的亚晶格磁矩和亚晶格磁矩 辅助记录层的稀土金属彼此反平行。 以及在磁光记录介质上记录信息的方法。 该结构能够通过光强度调制而不使用初始化磁场。

公开(公告)号：USRE35629E

公开(公告)日：1997-10-14

申请号：US136019

申请日：1993-10-14

申请人： Yoshiteru Murakami ,  Akira Takahashi ,  Kazuo Van ,  Junichiro Nakayama ,  Hiroyuki Katayama ,  Kenji Ohta

发明人： Yoshiteru Murakami ,  Akira Takahashi ,  Kazuo Van ,  Junichiro Nakayama ,  Hiroyuki Katayama ,  Kenji Ohta

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B7/24

CPC分类号： G11B11/10584 ,  G11B11/10586

摘要： A magneto-optical memory element has a multi-layer construction in the order from a side first receiving light from a light-source which includes a first transparent dielectric film, a rare earth transition metal alloy film, a second transparent dielectric film and a reflective film. The magneto-optical device uses circular dichroism effect of a magnetic mater for reading information. The rare earth transition metal alloy film has a refractive index represented by n.+-..DELTA.n wherein n=3.2-3.55i and .DELTA.n=0.05-0.03i. The thickness of film is about 18 to 46 nm. The second transparent dielectric film has a refractive index of 2.0.+-.0.2 and a film thickness of 80 to 108 nm.

摘要翻译： 磁光存储元件具有从第一次接收来自光源的一侧的顺序的多层结构，该光源包括第一透明电介质膜，稀土过渡金属合金膜，第二透明电介质膜和反射 电影。 磁光装置使用磁性体的圆二色性来读取信息。 稀土过渡金属合金膜的折射率为n +/- DELTA n，n = 3.2-3.55i，DELTA n = 0.05-0.03i。 膜的厚度为约18至46nm。 第二透明电介质膜的折射率为2.0 +/- 0.2，膜厚为80〜108nm。

公开(公告)号：US5665467A

公开(公告)日：1997-09-09

申请号：US196978

申请日：1994-02-15

申请人： Junichiro Nakayama ,  Michinobu Mieda ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

发明人： Junichiro Nakayama ,  Michinobu Mieda ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B5/66

CPC分类号： G11B11/10586 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A magneto-optical recording medium includes a first magnetic layer, a second magnetic layer and a third magnetic layer respectively made of rare-earth-transition metal alloys which are laminated in this order. The first magnetic layer has a perpendicular magnetization in a temperature range between room temperature and its Curie temperature. The second magnetic layer made of GdFeCo is set such that its Curie temperature is higher than the Curie temperature of the first magnetic layer, coercive force thereof at room temperature is nearly zero, and that it has an in-plane magnetization at room temperature and a transition occurs therein from the in-plane magnetization to the perpendicular magnetization at above a predetermined temperature. The third magnetic layer is set such that it has a perpendicular magnetization in a temperature range of room temperature and its Curie temperature, its Curie temperature is higher than the Curie temperature of the first magnetic layer, and coercive force thereof at room temperature is smaller than the coercive force of the first magnetic layer.

摘要翻译： 磁光记录介质包括依次层叠的分别由稀土 - 过渡金属合金制成的第一磁性层，第二磁性层和第三磁性层。 第一磁性层在室温和居里温度之间的温度范围内具有垂直磁化强度。 由GdFeCo制成的第二磁性层的居里温度设定为高于第一磁性层的居里温度，室温下的矫顽力接近零，在室温下具有面内磁化强度， 在从预定温度以上的面内磁化强度向垂直磁化发生。 第三磁性层被设定为使其在室温的温度范围内具有垂直磁化强度和居里温度，居里温度高于第一磁性层的居里温度，室温下的矫顽力小于 第一磁性层的矫顽力。