公开(公告)号：US4424580A

公开(公告)日：1984-01-03

申请号：US260963

申请日：1981-05-06

申请人： Becker Carl H. ,  Werner J. Christmann

发明人： Becker Carl H. ,  Werner J. Christmann

IPC分类号： G03G5/16 ,  G11B11/105 ,  G11B11/18 ,  G11C13/06 ,  H01F41/14 ,  G11C13/04

CPC分类号： H01F41/14 ,  G03G5/16 ,  G11B11/10502 ,  G11B11/10539 ,  G11B11/10545 ,  G11C13/06 ,  G11B11/10584 ,  G11B11/10586

摘要： Methods and apparatus for reversibly altering magnetic characteristics or domains of ferrimagnetic material by photomagnetic means, particularly by electron spin reversal (spin-flip). Photomagnetic electron spin reversal and inversion creating cylinder domains and their surrounding toroid domains of oppositely directed intrinsic magnetization in ferrimagnetic thin film material are achieved by means of signal modulated circularly polarized laser radiation. Three different stable conditions are detectable. The invention has particular application as a fundamentally new aproach to erasable digital data storage, providing means and methods for photomagnetically alterable and erasable data storage which can be detected by observing polarization of optical radiation directed through the ferrimagnetic material.

摘要翻译： 通过光磁手段，特别是通过电子自旋反转（旋转翻转）可逆地改变铁磁材料的磁特性或畴的方法和装置。 通过信号调制的圆偏振激光辐射，实现了在亚铁磁性薄膜材料中产生磁畴的反磁反转和产生圆柱体畴及其周向环形区域的相反定向的本征磁化。 可检测到三种不同的稳定条件。 本发明作为可擦除数字数据存储的基本新颖的方法具有特别的应用，提供了可通过观察通过铁氧体材料引导的光辐射的偏振来检测光可变和可擦除数据存储的方法和方法。