Title :
Magnetic garnet films prepared by ion beam sputtering and their application to optical isolators
Author :
Takahashi, T. ; Toshima, H. ; Imaizumi, N. ; Okuda, T. ; Miyazawa, Y.
Author_Institution :
Namiki Precision Jewel Co. Ltd., Tokyo, Japan
fDate :
11/1/1991 12:00:00 AM
Abstract :
As a 45° Faraday rotator of an optical isolator in the visible region, highly Bi-substituted iron garnet films prepared by reactive ion beam sputtering-deposition (RIBS) are investigated. Both Bi3Fe5O12 and Bi2.5Y0.5 Fe5O12 films are deposited onto (111) oriented Gd3Lu2Ga3O12 and Gd 3Sc2Ga3O12 garnet substrates. The surface morphology becomes rougher as the film thickness increases approximately over 1.5 μm. The two-step RIBS growth method and sputtering conditions are examined. A 15° Faraday rotation angle at a film thickness of 2.3 μm (λ=633 nm) is obtained. Combining the 2.3 μm-thick RIBS-grown film with a 28 μm-thick conventional LPE (liquid-phase epitaxy) grown film produced a 45° Faraday rotator. The forward and backward losses of the isolator are 4.2 dB and -35 dB, respectively
Keywords :
bismuth compounds; garnets; iron compounds; magnetic thin films; magneto-optical devices; optical isolators; sputtered coatings; yttrium compounds; -35 dB; 4.2 dB; 633 nm; Bi2.5Y0.5Fe5O12; BiFe5O12; BiIG; Faraday rotator; Gd3Lu2Ga3O12; Gd3Sc2Ga3O12; LPE; RIBS-grown film; backward losses; film thickness; forward losses; ion beam sputtering; optical isolators; surface morphology; two-step RIBS growth; Bismuth; Garnet films; Ion beams; Iron; Isolators; Optical films; Particle beam optics; Ribs; Sputtering; Substrates;
Journal_Title :
Magnetics, IEEE Transactions on
