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    • 71. 发明授权
    • Magneto optical storage device using a multi-layer film of Pt/Co
laminated sections
    • 磁光存储器件采用Pt / Co层叠多层薄膜
    • US5305300A
    • 1994-04-19
    • US888548
    • 1992-05-22
    • Kenji OhtaAkira TakahashiJunsaku NakajimaYoshiteru Murakami
    • Kenji OhtaAkira TakahashiJunsaku NakajimaYoshiteru Murakami
    • G11B11/105G11B7/24
    • G11B11/10582G11B11/10593Y10S428/90
    • A magneto-optical storage device having a configuration wherein a first AlN film, a Pt/co multi-layer film formed by alternately depositing Pt and Co, a second AlN film, and an Al reflective film are successively laminated on a substrate in this order. Assuming that respectively the thickness of the first AlN film is .delta.AlN (1); that of the second AlN film is .delta.AlN (2); that of the Pt single layer is .delta.Pt; that of the Co single layer is .delta.Co; and the total thickness of the Pt/Co multi-layer film is .delta.Pt/Co, each thickness of those layers is set to range within: 50 nm .ltoreq..delta.AlN (1).ltoreq.200 nm; 120 nm.ltoreq..delta.AlN (2).ltoreq.140 nm; 0.6 nm.ltoreq..delta.Pt.ltoreq.1.0 nm; 0.3 nm.ltoreq..delta.Co.ltoreq.0.6 nm; and 15 nm.ltoreq..delta.Pt/Co.ltoreq.20 nm. In accordance with the above arrangement, it is possible to greatly widen the tolerances of the film thicknesses of the first and second dielectric layers for obtaining a predetermined reflective index as well as a maximum Kerr rotation angle. Consequently, without strictly controlling the film thicknesses of the first and second AlN films, a magneto-optical storage device with stable performance suitable for practical use can be produced easily.
    • 具有这样一种结构的磁光存储装置,其中第一AlN膜,通过交替沉积Pt和Co形成的Pt / co多层膜,第二AlN膜和Al反射膜依次层叠在基板上 。 假设第一AlN膜的厚度分别为(Δ)AlN(1); 第二AlN膜的厚度为(Δ)AlN(2); Pt单层为(delta)Pt; Co单层为(delta)Co; 并且Pt / Co多层膜的总厚度为(delta)Pt / Co,这些层的每个厚度设定在:50nm <=(delta)AlN(1)<= 200nm的范围内; 120nm <=(delta)AlN(2)<= 140nm; 0.6nm <=(delta)Pt <= 1.0nm; 0.3nm <=(delta)Co <= 0.6nm; 和15nm <=(delta)Pt / Co <= 20nm。 根据上述结构,可以大大拓宽第一和第二介质层的膜厚的公差,以获得预定的反射率以及最大的克尔旋转角。 因此,在不严格控制第一和第二AlN膜的膜厚的情况下,可以容易地制造出具有适合于实际应用的稳定性能的磁光存储装置。
    • 73. 发明授权
    • Magneto-optical recording medium and method of recording and reproducing
using the same
    • 磁光记录介质及使用其的记录和再现方法
    • US5683803A
    • 1997-11-04
    • US433088
    • 1995-05-03
    • Junichiro NakayamaMichinobu MiedaJunji HirokaneAkira TakahashiKenji Ohta
    • Junichiro NakayamaMichinobu MiedaJunji HirokaneAkira TakahashiKenji Ohta
    • G11B11/10G11B11/105G11B5/66B32B5/16
    • G11B11/10586G11B11/10506G11B11/10515G11B11/10523Y10S428/90Y10T428/26Y10T428/265
    • A magneto-optical recording medium includes a first magnetic layer and a second magnetic layer being laminated. When information is to be recorded on the first magnetic layer, first, a magnetization direction in the second magnetic layer is arranged in one direction with an application of an initialization magnetic field. Then, an intensity modulated light beam is projected while applying thereto a recording magnetic field so as to change the magnetization direction in the second magnetic layer. Thereafter, the magnetization direction in the second magnetic layer is copied to the first magnetic layer, thereby recording information. The first magnetic layer has a magnetization in an intermediate direction between a perpendicular direction and an in-plane direction at room temperature, while has a perpendicular magnetization at above a predetermined temperature. Therefore, a smaller exchange coupling force is exerted from the first magnetic layer to the second magnetic layer at room temperature, thereby enabling a rewriting information with a smaller initialization magnetic field compared with the conventional method, thereby achieving a reduction in size of the apparatus and power conservation.
    • 磁光记录介质包括层叠的第一磁性层和第二磁性层。 当要在第一磁性层上记录信息时,首先,通过施加初始化磁场,将第二磁性层中的磁化方向布置在一个方向上。 然后,施加强度调制光束,同时向其施加记录磁场,以改变第二磁性层中的磁化方向。 此后,将第二磁性层中的磁化方向复制到第一磁性层,从而记录信息。 第一磁性层在室温下具有在垂直方向和面内方向之间的中间方向上的磁化强度,同时具有高于预定温度的垂直磁化强度。 因此,与常规方法相比,在室温下从第一磁性层向第二磁性层施加较小的交换耦合力,从而能够实现与常规方法相比具有较小初始化磁场的重写信息,从而实现装置的尺寸减小 省电。
    • 75. 发明授权
    • Method and apparatus for reproducing data from a magneto-optical
recording medium having a readout layer, transfer layer and recording
layer
    • 用于从具有读出层,转印层和记录层的磁光记录介质再现数据的方法和装置
    • US5962126A
    • 1999-10-05
    • US975517
    • 1997-11-20
    • Michinobu MiedaHiroyuki KatayamaAkira TakahashiKenji Ohta
    • Michinobu MiedaHiroyuki KatayamaAkira TakahashiKenji Ohta
    • G11B11/10G11B11/105G11B5/66
    • G11B11/10515G11B11/10586Y10S428/90Y10T428/26
    • 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.
    • 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。
    • 78. 发明授权
    • Optical recording element and driving system
    • 光学记录元件和驱动系统
    • US5335220A
    • 1994-08-02
    • US821361
    • 1992-01-16
    • Kenji OhtaTetsuya InuiHiroyuki KatayamaAkira TakahashiJunji HirokaneYukinori NishitaniMichinobu MiedaKazuo Van
    • Kenji OhtaTetsuya InuiHiroyuki KatayamaAkira TakahashiJunji HirokaneYukinori NishitaniMichinobu MiedaKazuo Van
    • G11B7/0045G11B7/013G11B7/09G11B7/125G11B7/24G11B7/24085G11B11/105G11B19/02G11B3/78
    • G11B7/0045G11B11/10528G11B11/10578G11B11/10595G11B19/02G11B7/0938G11B7/126G11B7/24G11B7/24085
    • An optical recording element comprising a recording medium which includes an information recording area formed at every unit in a non-continuous condition, the recording medium further including sample pits disposed at intervals of a fixed distance for providing basic information about the locations of the recording units in same track. Each sample pit comprises a plurality of pits disposed next to the sequence of the recording units so that the spacing between the pits differs from the spacing between the recording units. At least one of the plurality of pits is a long-sized inclined pit which is inclined at an angle in the range of 6.degree. to 80.degree. to a recording track. A driving system for driving the optical recording element for recording information in the non-continuous recording area or erasing information stored therein with a light beam the output of which is varied as required and checking whether said recording or erasing has been correctly performed, within a very short time in which the light beam passes through the non-continuous recording area. By using the optical recording element in combination with its driving system, the processing speed for reducing, erasing and verifying these functions can be greatly improved and the irradiating position of the light beam at every recording unit can be correctly controlled.
    • 一种光记录元件,包括记录介质,该记录介质包括在非连续状态下在每个单元处形成的信息记录区域,所述记录介质还包括以固定距离间隔设置的样品坑,以提供关于记录单元的位置的基本信息 在同一轨道。 每个采样坑包括靠近记录单元序列设置的多个凹坑,使得凹坑之间的间隔与记录单元之间的间隔不同。 多个凹坑中的至少一个是相对于记录轨道以6°至80°的角度倾斜的长尺寸倾斜凹坑。 一种驱动系统,用于驱动用于在非连续记录区域中记录信息的光学记录元件,或者用存储在其中的光束擦除信息,该光束的输出根据需要变化,并且检查是否正确地执行了所述记录或擦除 光束通过非连续记录区域的非常短的时间。 通过与其驱动系统结合使用光学记录元件,可以大大提高用于减少,擦除和验证这些功能的处理速度,并且可以正确地控制每个记录单元处的光束的照射位置。