Bismuth-substituted rare earth iron garnet single crystal

Details Bismuth-substituted rare earth iron garnet single crystal Bismuth-substituted rare earth iron garnet single crystal

1995-01-05

1996-10-15

Breneman, R. Bruce

Compositions

Magnetic

Iron-oxygen compound containing

117937, 423263, C30B 2928, C01G 4900

Patent

active

055651313

ABSTRACT:
A bismuth-substituted rare earth iron garnet single crystal film is represented by a general equation Tb.sub.x Lu.sub.y Bi.sub.3-x-y Fe.sub.5-z Al.sub.z O.sub.12 (where 0.09.ltoreq.y/x.ltoreq.0.23, 1.40.ltoreq.x+y.ltoreq.1.70, 0.20.ltoreq.z.ltoreq.0.38) grown on a non-magnetic garnet substrate (CaGd).sub.3 (MgZrGa).sub.5 O.sub.12 having a lattice constant of 12.490 .ANG.-12.500 .ANG. by a liquid phase epitaxial method. The bithmus-substituted rare earth iron garnet single crystal film satisfies three conditions that (1) the Faraday effect is large, i.e., the film thickness required for the Faraday rotator at a wavelength of 1.55 .mu.m is 450 .mu.m or less, (2) the saturated magnetic field is 800 (Oe) or less, and (3) the temperature coefficient .alpha. is 0.07 deg/.degree.C. or less.

REFERENCES:
patent: 4168107 (1979-09-01), Sauter
patent: 4582562 (1986-04-01), Tamaki et al.
patent: 5043231 (1991-08-01), Miyazawa et al.
patent: 5212446 (1993-05-01), Itoh et al.
patent: 5277845 (1994-01-01), Ryuo et al.
Journal of Applied Physics., H. Umeza et al., vol. 63, No. 8, Apr. 15, 1988, pp. 3113-3115.
"Temperature Dependence of Faraday Rotation for Bi-Substituted Terbium Iron Garnet Films," Y. Honda et al., Nihon Oyo Jiki Gakkaishi, vol. 11, No. 2 (1987).

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