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Structural and Magnetic Characterization of Bi-Substituted Garnet on Si and GaAs

Published online by Cambridge University Press:  15 February 2011

Ken M. Ring ,
A.L. Shapiro ,
F. Deng ,
R.S. Goldman ,
F. Spada ,
F. Hellman ,
T.L. Cheeks ,
K.L. Kavanagh  and
Takao Suzuki
Ken M. Ring
Affiliation:
Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla CA 92093-0407
A.L. Shapiro
Affiliation:
Department of Physics, University of California at San Diego, La Jolla CA 92093-0407
F. Deng
Affiliation:
Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla CA 92093-0407
R.S. Goldman
Affiliation:
Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla CA 92093-0407
F. Spada
Affiliation:
Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla CA 92093-0407
F. Hellman
Affiliation:
Department of Physics, University of California at San Diego, La Jolla CA 92093-0407
T.L. Cheeks
Affiliation:
Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla CA 92093-0407
K.L. Kavanagh
Affiliation:
Department of Electrical and Computer Engineering, University of California at San Diego, La Jolla CA 92093-0407
Takao Suzuki
Affiliation:
IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120-6099
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Abstract

Novel material structures that combine magneto-optic (MO) and semiconductor devices have potential applications in monolithic microwave systems and optoelectronics. We have investigated the materials issues pertaining to the film structure, interface uniformity, and magnetic/MO properties of (BiDy)3(FeGa)5O12 (Bi-DyIG) thin films sputter deposited on Si and GaAs. The rapid thermally annealed films were polycrystalline with a nominal grain size of 20 nm. The magnetic and MO properties were strongly dependent on the type of substrate such that square hysteresis loops and coercivities of 0.1 to 0.9 kOe were observed for Bi-DyIG/Si structures while Bi-DyIG/GaAs structures showed much lower coercivity values (0.03 kOe). A comparison of the magnetic properties, microstructure and substrate composition was carried out with plan-view and cross-section transmission electron microscopy, as well as electron and x-ray diffraction. The results suggest that grain orientation effects, stress, and compositional inhomogeneity due to interfacial reactions or diffusion introduced by the substrate strongly influence the magnetic and MO properties of the films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 384: Symposium L – Magnetic Ultrathin films, Multilayers and Surfaces , 1995 , 41
Copyright
Copyright © Materials Research Society 1995

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References

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