公开(公告)号：US3729724A

公开(公告)日：1973-04-24

申请号：US3729724D

申请日：1971-06-08

Applicant: IBM

Inventor： AHEARN W ,  ALMASI G ,  GENOVESE E

IPC: G11B11/10 ,  G11C13/06 ,  G11C19/08 ,  H01S3/11 ,  G11C11/14 ,  G11C11/42

CPC classification number: H01S3/1124 ,  G11B11/10 ,  G11C13/06 ,  G11C19/0866

Abstract: The presence and absence of cylindrical domains in a magnetic material is determined by using either the Faraday or Kerr effect in conjunction with two semiconductor lasers. When both lasers are biased just below their lasing thresholds, the magnetic material, in conjunction with the cylindrical domains, functions as a Q-switch wherein the cylindrical domains establish an optical cavity when they enter the optical path between the two lasers. When one laser is biased just below its lasing threshold and the other is biased in its lasing mode, the apparatus functions in a source-detector mode. The apparatus operating in either mode is very adaptable for multicell or array implementation.

Abstract translation: 通过使用法拉第或克尔效应与两个半导体激光器结合来确定磁性材料中圆柱形畴的存在和不存在。 当两个激光器偏压刚好低于它们的激光阈值时，与圆柱形畴结合的磁性材料用作Q开关，其中当它们进入两个激光器之间的光路时，圆柱形域建立光腔。 当一个激光器偏置刚好低于其激光阈值，另一个激光器以其激光模式偏置时，该器件在源检测器模式下起作用。 在任一模式下工作的设备非常适用于多单元或阵列实现。

公开(公告)号：CA939058A

公开(公告)日：1973-12-25

申请号：CA130469

申请日：1971-12-20

Applicant: IBM

Inventor： GENOVESE E

IPC: G11C19/08

Abstract: A method and apparatus for creation of cylindrical, single wall domains in selected locations in a magnetic sheet, such as orthoferrite or garnet films. A bias (stabilizing) magnetic field is applied normal to the magnetic sheet to saturate the sheet in one direction so that no reversely magnetized domains are present in the storage area. A localized magnetic field normal to the magnetic sheet but oppositely directed with respect to the bias field is then created. This localized field is produced by the action of an in-plane field and a bar of magnetic material on the sheet, or by a small current loop. The bias field is then reduced until a domain in nucleated at the site of the localized field. The domain will nucleate when the net reversely directed local field is greater than the nucleation field Hn at that location. The bias field is then increased to regulate the diameter of the domain produced. Means are provided to create a variable bias field normal to the sheet and to create an oppositely directed variable localized field at selected locations in the shett.