公开(公告)号：US5371721A

公开(公告)日：1994-12-06

申请号：US998898

申请日：1992-12-28

申请人： Franciscus J. A. M. Greidanus ,  Johannes H. M. Spruit ,  Bernardus A. J. Jacobs

发明人： Franciscus J. A. M. Greidanus ,  Johannes H. M. Spruit ,  Bernardus A. J. Jacobs

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

CPC分类号： G11B11/10528 ,  G11B11/10508 ,  G11B11/10513 ,  G11B11/10554

摘要： A method and apparatus for writing and reading information in the form of a pattern of magnetic domains in an information layer of a record carrier. An optical scanning beam is focused to a diffraction-limited radiation spot, and a magnetic field is generated by a coil supplied with an energizing current the amplitude of which is modulated by the information signal to be recorded. The magnetic field is thereby modulated, and produces magnetic domains in the information layer such that each domain has a variable number of sub-domains and consequently a variable magnetization ratio, as determined by the information signal. This permits recording at an information density exceeding that corresponding to the size of the radiation spot.

摘要翻译： 一种用于在记录载体的信息层中以磁畴图案的形式写入和读取信息的方法和装置。 光学扫描光束被聚焦到衍射受限的辐射光点，并且由提供有激励电流的线圈产生磁场，该激励电流的幅度由要被记录的信息信号调制。 因此磁场被调制，并且在信息层中产生磁畴，使得每个域具有可变数量的子域，并且因此由信息信号确定可变磁化比。 这允许以超过与辐射点的尺寸相对应的信息密度进行记录。

公开(公告)号：US5109375A

公开(公告)日：1992-04-28

申请号：US384587

申请日：1989-07-24

申请人： Franciscus J. A. M. Greidanus ,  Peter F. Carcia ,  Wouter B. Zeper ,  Friedrich J. A. den Broeder ,  Willem F. Godlieb

发明人： Franciscus J. A. M. Greidanus ,  Peter F. Carcia ,  Wouter B. Zeper ,  Friedrich J. A. den Broeder ,  Willem F. Godlieb

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

CPC分类号： G11B11/10582

摘要： A record carrier for thermomagnetic recording of information and magneto-optical readout of the recorded information. The record carrier includes a substrate and a recording layer thereon in the form of multi-layers of magnetic and non-magnetic material, the magnetic layers predominately containing cobalt and the non-magnetic layers predominantly containing transition metal. The magnetic and non-magnetic layers alternate, and the overall thickness of the complete multi-layer recording layer is less than 75 nm. Such a recording layer achieves a significant improvement in both thermomagnetic write properties and magneto-optical read properties.