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Linear birefringence control and magnetization in sputter-deposited magnetic garnet films

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6 Author(s)
H. C. Yang ; Dept. of Mater. Sci., Michigan Technol. Univ., Houghton, MI, USA ; M. Levy ; R. Li ; P. D. Moran
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Birefringence control is essential in the fabrication of on-chip magnetooptic Faraday isolators. We report on film thickness and stress studies of birefringence in sputter-deposited single-layer bismuth-substituted iron garnet films and double-layer iron garnet films with gadolinium gallium garnet (GGG) covers. We examine compressively and tensilely strained films and analyze the photoelastic response of the sputter-deposited garnet films. We show that the net birefringence can be ed out under planar compressive strain conditions. Bilayer GGG on iron garnet film yields a reduced birefringence. Temperature control during the sputter deposition of the GGG cover is critical and strongly influences the magnetic moment and birefringence level in the waveguide. High-temperature deposition lowers the magnetization in the underlying iron garnet film.

Published in:

IEEE Transactions on Magnetics  (Volume:40 ,  Issue: 6 )