公开(公告)号：US6027825A

公开(公告)日：2000-02-22

申请号：US869921

申请日：1997-06-05

申请人： Tsutomu Shiratori ,  Tomoyuki Hiroki

发明人： Tsutomu Shiratori ,  Tomoyuki Hiroki

IPC分类号： G11B11/105 ,  G11B5/66

CPC分类号： G11B11/10582 ,  G11B11/10506 ,  G11B11/10508 ,  G11B11/10515 ,  G11B11/10528 ,  G11B11/10543 ,  G11B11/10584 ,  G11B11/10586 ,  G11B11/10504 ,  G11B11/10593 ,  Y10S428/90 ,  Y10T428/24942

摘要： A magnetooptical recording medium includes a first magnetic layer, a second magnetic layer whose Curie temperature is lower than that of the first magnetic layer, and a third magnetic layer, comprising a vertically-magnetizing film, whose Curie temperature is higher than that of the second magnetic layer. The first magnetic layer, the second magnetic layer and the third magnetic layer are in a state of exchange coupling with each other at a portion of a vertically-magnetizing film. A domain walls formed in the first magnetic layer moves when the temperature of the medium has been raised to at least the Curie temperature of the second magnetic layer.

公开(公告)号：US5648134A

公开(公告)日：1997-07-15

申请号：US450110

申请日：1995-05-25

申请人： Tsutomu Shiratori ,  Hiroshi Yoshida

发明人： Tsutomu Shiratori ,  Hiroshi Yoshida

IPC分类号： G11B11/10 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/006 ,  G11B11/105 ,  B32B3/00

CPC分类号： G11B7/006 ,  G11B11/10502 ,  G11B11/10584 ,  G11B7/0045 ,  G11B7/0055 ,  Y10S428/913 ,  Y10S430/146 ,  Y10T428/21

摘要： Recording or erasing on a thermal recording medium is performed such a manner that a local region of a recording film on the recording medium is heated to a predetermined temperature to reversibly change the state of the local region between two states. In this method, the recording film is initialized in one of the two states. When the recording film is set in the other of the two states upon continuous or intermittent heating, a band-like region elongated in a recording direction on the recording film is formed to effect the erasing operation. In recording step, the local region of the recording film is heated to a predetermined temperature in accordance with information so as to include the band-like region in the local region to be heated and a state of the heated local region is caused to be identical with the state upon the initialization.

摘要翻译： 以记录介质上的记录膜的局部区域被加热到预定温度的方式进行在热记录介质上的记录或擦除，以可逆地改变两个状态之间的局部区域的状态。 在这种方法中，记录膜在两种状态之一中被初始化。 当在连续或间歇加热时将记录膜设置在两种状态中的另一种状态时，形成在记录膜上沿记录方向伸长的带状区域以实现擦除操作。 在记录步骤中，记录膜的局部区域根据信息被加热到预定温度，以便在待加热的局部区域中包括带状区域，并且使加热的局部区域的状态相同 初始化状态。

公开(公告)号：US07126886B2

公开(公告)日：2006-10-24

申请号：US10123894

申请日：2002-04-16

申请人： Motoyoshi Murakami ,  Masahiro Birukawa ,  Tsutomu Shiratori ,  Yasuyuki Miyaoka

发明人： Motoyoshi Murakami ,  Masahiro Birukawa ,  Tsutomu Shiratori ,  Yasuyuki Miyaoka

IPC分类号： G11B11/10

CPC分类号： G11B11/10582 ,  G11B11/10528 ,  G11B11/10584

摘要： According to the present invention, a light beam is radiated to an area between recording tracks while the intensity of a magnetic field from the outside to a magneto-optical recording medium is suppressed to 50 Oe or less, whereby magnetic anisotropy formed between the recording tracks is set to be lower than that of the magnetic layer on the recording tracks, and micro-domains, for example, having a diameter smaller than a half-width of a light beam for reproduction in a film surface direction are formed on recording tracks. Because of this method, the influence of a leakage magnetic field in the magneto-optical recording medium adopting a DWDD reproducing system is alleviated.

公开(公告)号：US20050128641A1

公开(公告)日：2005-06-16

申请号：US11003431

申请日：2004-12-06

申请人： Tsutomu Shiratori

发明人： Tsutomu Shiratori

IPC分类号： G11B11/105 ,  G11B5/127 ,  G11B5/64 ,  G11B5/74 ,  G11B5/84

CPC分类号： G11B11/10582 ,  G11B5/656 ,  G11B5/84 ,  G11B11/10578 ,  G11B11/10584

摘要： The present invention provides a magnetic recording medium capable of having a high density of tracks and excellent in reproducing characteristics. The magnetic recording medium of the present invention is a magnetic recording medium having a stacked structure composed of a memory layer, a domain wall displacement layer having domain wall-resistant magnetism smaller than the memory layer, and a switching layer having a lower Curie temperature than these layers interposed between these layers, wherein a recording surface of the magnetic recording medium is divided into a plurality of tracks of a predetermined track pitch, and the domain wall displacement layer has a recording track region limited in a track width direction in a central portion of each track, a magnetized state of a vertically magnetized memory layer is only transferred in the recording track region, and a buffer region except for the recording track region is magnetically oriented in an in-plane direction at a predetermined temperature or lower irrespective of transfer of the magnetized state and transits to a state capable of being vertically magnetized at the predetermined temperature or higher, an in-plane magnetic film being present immediately under the buffer region of the domain wall displacement layer.

摘要翻译： 本发明提供一种磁记录介质，其能够具有高密度的磁道和优异的再现特性。 本发明的磁记录介质是具有堆叠结构的磁记录介质，该堆叠结构由存储层，具有小于存储层的畴壁耐久磁性的畴壁位移层和具有较低居里温度的开关层构成 这些层插入在这些层之间，其中磁记录介质的记录表面被划分成预定轨道间距的多个轨道，并且畴壁位移层具有在中心部分中沿轨道宽度方向限制的记录轨道区域 每个磁道的磁化状态仅被传送到记录磁道区域，并且除了记录磁道区域之外的缓冲区域在预定的温度或更低的温度下在面内方向上被磁性取向，而与转印无关 的磁化状态，并且转移到能够在预先被垂直磁化的状态 确定的温度或更高，面内磁性薄膜存在于畴壁位移层的缓冲区的正下方。

公开(公告)号：US06403205B1

公开(公告)日：2002-06-11

申请号：US09616986

申请日：2000-07-14

申请人： Tsutomu Shiratori

发明人： Tsutomu Shiratori

IPC分类号： G11B11105

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 including first, second and third magnetic layers laminated in succession, wherein (1) when 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 and h1, respectively, (2) 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, 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(T)| k3(T)=(2Ms1*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（1）当由cgs单元系统表示的温度T下的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和h1;（2）第三磁性层的磁壁能量密度，饱和磁化强度，磁壁矫顽力和膜厚度分别定义为σ3，Ms3，Hw3和h3（ 3）界面磁壁能量，第一磁性层和第三磁性层之间的密度定义为sigmaw13，（4）sigmaw13为0erg / cm2的最低温度为Ts，在室温下满足， 在大于温度Ts且比第一磁性层的居里温度Tc1低10℃或更高的温度范围内，在温度r内选择合适的温度Tp 大约Ts到Tp，并且满意，在哪里

公开(公告)号：US5751669A

公开(公告)日：1998-05-12

申请号：US666918

申请日：1996-06-19

申请人： Tsutomu Shiratori

发明人： Tsutomu Shiratori

IPC分类号： G11B11/10 ,  G11B7/125 ,  G11B11/105 ,  G11B13/04

CPC分类号： G11B7/126 ,  G11B11/10519 ,  G11B11/1053 ,  G11B11/10584 ,  G11B11/10506 ,  G11B11/10586

摘要： A light beam modulated according to a data signal to be recorded is irradiates a magnetooptical recording medium while moving the recording medium. During a series of recording operations, a predetermined recording area of the recording medium is heated to a temperature of a second temperature T.sub.2 or higher in accordance with the data signal and at least a part of the area heated to the temperature of second temperature T.sub.2 or higher is once cooled down to a temperature of a third temperature T.sub.3 or lower. Then, it is heated to a temperature of a first temperature T.sub.1 or higher. Thus, the recording medium is locally heated or cooled, so that recording of information is performed.

摘要翻译： 根据要记录的数据信号调制的光束在移动记录介质的同时照射磁光记录介质。 在一系列记录操作期间，根据数据信号将加热到第二温度T2或更高温度的记录介质的预定记录区域加热至第二温度T2的温度的至少一部分区域，或 较高的温度一度冷却至第三温度T3以下。 然后将其加热至第一温度T1或更高的温度。 因此，记录介质被局部加热或冷却，从而进行信息的记录。

公开(公告)号：US5418076A

公开(公告)日：1995-05-23

申请号：US795345

申请日：1991-11-20

申请人： Tsutomu Shiratori

发明人： Tsutomu Shiratori

IPC分类号： G11B11/105 ,  G11B11/10

CPC分类号： G11B11/10502 ,  G11B11/10586 ,  Y10S428/90

摘要： A magneto-optical recording medium in which n layers (n is an odd number equal to or more than 5) of magnetic thin film are exchange-coupled to be laminated on a substrate, and assuming that the n layers of magnetic thin film are the first magnetic layer, the second magnetic layer, . . . the n-th magnetic layer in sequence, and the Curie temperature on the i-th magnetic layer is Tc.sub.i, the following conditions are satisfied (where Tc.sub.n+1 is an ambient temperature and m is an arbitrary natural number equal to or less than (n-1)/2).(1) Tc.sub.2m+1 .gtoreq.Tc.sub.2m, Tc.sub.1 .gtoreq.Tc.sub.2m(2) Tc.sub.2m .gtoreq.Tc.sub.2(m+1)(3) In a cooling process after heating the medium to a temperature of Tc.sub.2 or more, when the temperature of the (2m)-th magnetic layer drops down to a temperature near Tc.sub.2m, the magnetization of the (2m)-th and (2m+1)-th magnetic layers orients to the (2m-1)-th magnetic layer so that the bonding state due to exchange interaction may be stable, while the magnetization on the (2m-1)-th magnetic layer retains its immediately previous orientation state.

摘要翻译： 将磁性薄膜的n层（n为奇数等于或大于5）的磁光记录介质交换耦合以层叠在基板上，并且假设n层磁性薄膜为 第一磁性层，第二磁性层。 的。 的。 第n磁性层和第i磁性层的居里温度为Tci，满足以下条件（其中Tcn + 1为环境温度，m为等于或小于（ n-1）/ 2）。 （1）Tc2m + 1> / = Tc2m，Tc1> / = Tc2m（2）Tc2m> / Tc2（m + 1）（3）在将介质加热至Tc2以上的温度下， （2m）第1磁性层的温度下降到接近Tc2m的温度，所以（2m）和（2m + 1）磁性层的磁化决定于第（2m-1）磁性层 由于交换相互作用的结合状态可能是稳定的，而第（2m-1）磁性层上的磁化保持其刚刚的取向状态。

公开(公告)号：US07399539B2

公开(公告)日：2008-07-15

申请号：US11003431

申请日：2004-12-06

申请人： Tsutomu Shiratori

发明人： Tsutomu Shiratori

IPC分类号： G11B11/105 ,  B01J19/12 ,  C23C14/34

CPC分类号： G11B11/10582 ,  G11B5/656 ,  G11B5/84 ,  G11B11/10578 ,  G11B11/10584

摘要： A magneto-optic recording medium has a stacked structure composed of a memory layer, a domain wall displacement layer having domain wall-resistant magnetism smaller than the memory layer, and a switching layer having a lower Curie temperature than these layers interposed between these layers. A recording surface of the magneto-optic recording medium is divided into a plurality of tracks of a predetermined track pitch. A domain wall displacement layer has a recording track region limited in a track width direction in a central portion of each track. A magnetized state of a vertically magnetized memory layer is only transferred in the recording track region. A buffer region is magnetically oriented in an in-plane direction at a predetermined temperature or lower and is vertically magnetized at the predetermined temperature or higher.

摘要翻译： 磁光记录介质具有由存储层，具有小于存储层的畴壁抗磁性的畴壁位移层和比这些层之间插入的这些层低的居里温度的开关层组成的堆叠结构。 磁光记录介质的记录表面被划分成预定轨道间距的多个轨迹。 畴壁位移层在每个轨道的中心部分具有在轨道宽度方向上限制的记录轨道区域。 垂直磁化存储层的磁化状态仅在记录轨道区域中传送。 缓冲区域在预定温度或更低温度下在面内方向上磁取向，并且在预定温度或更高温度下垂直磁化。

公开(公告)号：US07145847B2

公开(公告)日：2006-12-05

申请号：US10640024

申请日：2003-08-14

申请人： Chihiro Nagura ,  Tsutomu Shiratori

发明人： Chihiro Nagura ,  Tsutomu Shiratori

IPC分类号： G11B7/00

CPC分类号： G11B11/10582 ,  G11B11/10584

摘要： A high density optical information recording medium comprises a substrate having rows of land and groove and a recording layer formed on the substrate. Each of the rows of land or groove includes at least two recording tracks separated by a denatured region produced by irradiating e.g. the center of each row in the recording layer with a denaturing light beam accompanied with one or two sub-beams for tracking control. Recording and reproduction of information can be performed likewise by using a recording or reproduction light beam accompanied with one or two tracking sub-beams.

摘要翻译： 高密度光学信息记录介质包括具有脊和槽的行的基板和形成在基板上的记录层。 每排脊或凹槽中的每一行包括至少两个记录轨道，该记录轨道由变性区域分隔， 记录层中每行的中心具有伴随一个或两个子光束的变性光束，用于跟踪控制。 可以通过使用伴随着一个或两个跟踪子光束的记录或再现光束同样地执行信息的记录和再现。

公开(公告)号：US06980491B2

公开(公告)日：2005-12-27

申请号：US10419856

申请日：2003-04-22

申请人： Tsutomu Shiratori ,  Katsumi Arisaka

发明人： Tsutomu Shiratori ,  Katsumi Arisaka

IPC分类号： G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10597 ,  G11B11/10508 ,  G11B11/10582 ,  G11B11/10584

摘要： There is provided a domain wall displacement type magneto-optical recording medium and a recording method that allow signals recorded with a high density over the limit of resolution of optical systems to be regenerated without increasing complexity of a recording and regenerating apparatus or narrowing an operation margin even if a substrate having address information or the like incorporated therein is used. An information track has portions used for recording and regenerating information in the form of a magneto-optical signal and portions having irregularities to provide address information or servo information formed therein alternately arranged, and directions of magnetization of the third magnetic layer are polarized in one direction above the portions having the irregularities.

摘要翻译： 提供了一种域壁位移型磁光记录介质和记录方法，其允许在光学系统的分辨率极限下以高密度记录的信号被再生，而不增加记录和再生装置的复杂性或缩小操作余量 即使使用具有并入其中的地址信息等的基板。 信息轨道具有用于以磁光信号的形式记录和再生信息的部分和具有不规则性的部分，以提供交替布置的地址信息或伺服信息，并且第三磁性层的磁化方向在一个方向上极化 在具有不规则性的部分之上。