Three component magnetic field measurements using cubic anisotropy in (111) YIG films (abstract)

A magnetization behavior in YIG films with (111) orientation for a saturation in-plane magnetic field, taking into account the fourth (K1) and the sixth (K2) cubic anisotropy constants, is investigated theoretically and experimentally. Dependencies of a magnitude of the saturation field on material parameters were found. Different situations of a static and a rotating saturation magnetic field were considered. Analytical expressions for an induction signal caused by interference of in-plane magnetization homogeneous rotation with an ambient quasistatic magnetic field were obtained. It was shown that there exists a linear harmonic response to the ambient field both tangentially and perpendicularly to the film plane field orientations. Experimental results obtained for different kinds of YIG films were in good agreement with theory. Measured sensitivity was of the order of 10−7 Oe with a dynamic range of 80 dB. This, thereby, enables the design of a three component induction sensor with a high sensitivity and a large dynamic range.