Magneto-optic magnetic field sensors based on uniaxial iron garnet films in optical waveguide geometry

Published

November 1, 1993

Author(s)

M. N. Deeter, Gordon W. Day, R. Wolfe, V. J. Fratello

Abstract

Iron garnet films which exhibit perpendicular uniaxial magnetic anisotropy are promising materials for magneto-optic magnetic field sensing. In an optical waveguide geometry, these materials exhibit large values of saturation Faraday rotation which in turn produce high sensitivity. The domain structure of these films favors magnetization rotation as the primary magnetization process. This process is significantly faster than domain wall motion, which is the primary magnetization process in bulk iron garnet crystals. We present data which confirm the high sensitivity and wideband frequency response of these materials. One film exhibits a virtually flat frequency response from de to at least 1 GHz. Potential problems with waveguide sensors, such as birefringence and optical coupling efficiency, appear to be soluble.

Citation

IEEE Transactions on Magnetics

Volume

29

Issue

6

Pub Type

Journals

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Citation

Deeter, M. , Day, G. , Wolfe, R. and Fratello, V. (1993), Magneto-optic magnetic field sensors based on uniaxial iron garnet films in optical waveguide geometry, IEEE Transactions on Magnetics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=10274 (Accessed October 12, 2025)