Magnetic devices utilizing garnet epitaxial materials

Details Magnetic devices utilizing garnet epitaxial materials Magnetic devices utilizing garnet epitaxial materials

1974-09-23

1976-06-15

Moffitt, James W.

Communications: electrical

Digital comparator systems

252 6257, 252 6259, G11C 1114, C04B 3540

Patent

active

039640353

ABSTRACT:
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.

REFERENCES:
patent: 3613056 (1971-10-01), Bobeck
patent: 3735145 (1973-05-01), Heinz
patent: 3886533 (1975-05-01), Bonner et al.

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