公开(公告)号：US3964035A

公开(公告)日：1976-06-15

申请号：US508071

申请日：1974-09-23

申请人： Stuart Lawrence Blank ,  Roy Conway Le Craw

发明人： Stuart Lawrence Blank ,  Roy Conway Le Craw

IPC分类号： H01F10/24 ,  G11C11/14 ,  C04B35/40

CPC分类号： H01F10/24

摘要： Members of a particular class of magnetic garnet compositions show characteristics useful for incorporation in magnetic memory devices which depend for their operation on the positioning of single wall domains ("bubbles"). Such compositions, ordinarily in the form of a supported layer, manifest high limiting bubble velocity, thereby making possible high record and access rates. Tetrahedral iron sites in the concerned compositions are occupied by non-magnetic ions in amount such as to result in magnetically balanced iron sub-lattices so that the magnetic moment contribution is made primarily by dodecahedral site ions. Europium is a necessary dodecahedral site occupant. High limiting velocity is attributed to the high value of the gyromagnetic ratio (g value) associated with europium.