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High frequency magnetic field sensors based on the faraday effect in garnet thick films

Published

Author(s)

R. Wolfe, E. M. Gyorgy, R. A. Lieberman, V. J. Fratello, S. J. Licht, M. N. Deeter, Gordon W. Day

Abstract

The Faraday effect in the thick epitaxial films of magnetic garnets of the type used in magnetooptic isolators can be used as the basis for a fiber-optic magnetic field sensor. These films have uniaxial anisotropy perpendicular to the surface and they contain bismuth to enhance the Faraday rotation. The typical magnetic domain pattern of meandering stripes changes in response to an applied field perpendicular to the film and this changes the polarization of infrared light propagating perpendicular to the film. Theory and experiment show that the speed of operation is limited by relaxation or resonance effects to upper frequencies between 106 and 109 Hz. Maximum sensitivity requires low magnetic moment and large thickness, in conflict with the requirements for high speed.
Proceedings Title
Proc., Intl. Optical Fiber Sensors Conf.
Volume
60
Issue
17
Conference Dates
January 29-31, 1992
Conference Location
Monterey, CA

Citation

Wolfe, R. , Gyorgy, E. , Lieberman, R. , Fratello, V. , Licht, S. , Deeter, M. and Day, G. (1992), High frequency magnetic field sensors based on the faraday effect in garnet thick films, Proc., Intl. Optical Fiber Sensors Conf., Monterey, CA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=9510 (Accessed April 15, 2024)
Created April 26, 1992, Updated October 12, 2021