Ferrimagnetic iron garnet films are investigated as current-sensing elements. The Faraday effect within the films permits measurement of the magnetic field or current by a simple polarimetric technique. Polarized diffraction patterns from the films have been observed that arise from the presence of magnetic domains in the films. A physical model for the diffraction is discussed, and results from a mathematical analysis are in good agreement with the experimental observations. A method of current sensing that uses this polarized diffraction is demonstrated.
© 1995 Optical Society of America
Michael Ko and Elsa Garmire, "Current sensing using bismuth rare-earth iron garnet films," Appl. Opt. 34, 1692-1696 (1995)