Study of the anisotropy in the Faraday rotation with respect to the magnetic field orientation in n-type germanium at 24 GHz

Abstract

Faraday rotation measurements have been performed on a number of antimony-doped (111) and (110) oriented n-type germanium crystals using 23·99 GHz microwave radiation at room temperature. The samples studied were thin circular slices having resistivities between 10 and 1 Ω cm. The anisotropy in the Faraday rotation with respect to the magnetic field orientation has been studied by applying B along the [110] and [111] directions. The corrections for the multiple reflections and guided waves have also been included. All the rotation measurements for the [110] direction of B are found to be in good agreement with the anisotropic theory developed by Donovan and Webster, while for the [111] propagation the `isotropic formula' is sufficient. The rotation is found to increase with the magnetic induction as well as with the conductivity of the samples in the above range, as expected.