Faraday Rotation and Transition of Spin Configuration in Terbium Iron Garnet at Very High Magnetic Fields

Abstract

Faraday rotation and magnetization were observed for TbIG in very high magnetic fields up to the megagauss range for determining the critical field of the spin-flip transition from the collinear phase to the canted phase. The critical field was determined as a function of temperature over a wide temperature range. A large anisotropy in the critical field was observed at temperatures lower than the compensation point. The magnetic field dependence of the Faraday rotation at 1.06 μm wavelength, together with its temperature dependence were analyzed by using a formula which takes into account a linear term of the external field.