公开(公告)号：US20030107956A1

公开(公告)日：2003-06-12

申请号：US10302866

申请日：2002-11-25

申请人： Hitachi Maxwell, Ltd. ,  Sanyo Electric Co., Ltd.

发明人： Hiroyuki Awano ,  Hiroshi Shirai ,  Masafumi Yoshihiro ,  Satoru Oonuki ,  Norio Ohta ,  Katsusuke Shimazaki ,  Nobuyuki Nagai ,  Satoshi Sumi ,  Atsushi Yamaguchi

IPC分类号： G11B011/00

CPC分类号： G11B11/1051 ,  G11B11/10515 ,  G11B11/10554 ,  G11B11/1058 ,  G11B11/10584 ,  G11B11/10586 ,  G11B11/10595 ,  G11B27/19 ,  G11B27/3027

摘要： A magneto-optical recording medium 11 is irradiated with a reproducing light beam 13 so that only a minute magnetic domain 313b, which is subjected to recording in a recording layer 18 and which is smaller than null of a spot radius of the recording light beam 13, is selected by a gate layer 17 and transferred to a magnetic domain-magnifying and reproducing layer 3. The magnetic domain transferred to the magnetic domain-magnifying and reproducing layer 3 is magnified by using a magnifying and reproducing magnetic field 411 of an alternating magnetic field. A large reproduction signal is obtained from the magnified magnetic domain 419, and the minute magnetic domain can be subjected to reproduction at a high resolving power and at a high S/N ratio. The magnified magnetic domain 419 is reduced by using a reducing reproducing magnetic field 415 of the alternating magnetic field. The gate layer 17 has a thickness which is not less than a thickness of a magnetic wall of the magnetic domain. A non-magnetic layer may be used in place of the gate layer 17.

摘要翻译： 磁光记录介质11被再现光束13照射，使得仅在记录层18中进行记录并且小于记录光束13的光点半径的1/2的微小磁畴313b ，由栅极层17选择并被传送到磁畴放大和再现层3.转移到磁畴放大和再现层3的磁畴通过使用交变磁场的放大和再现磁场411来放大 领域。 从放大磁畴419获得大的再现信号，并且微分磁畴可以以高分辨率和高S / N比进行再现。 通过使用交变磁场的还原再现磁场415来减小放大磁畴419。 栅极层17的厚度不小于磁畴的磁壁的厚度。 可以使用非磁性层代替栅极层17。