Abstract
This paper describes a simple method for measuring the cubic anisotropy in garnet films. In (111)-oriented garnet films, the magnetization M is rotated from the film normal to the film plane by applying an in-plane field H//. The [111] component Mz of the magnetization M is measured magneto-optically. A plot of MzH// vs. Mz yields an approximately linear relation where the intercept of the line on the MzH// axis changes with the direction of H//, Thus, the cubic anisotropy K1 as well as the uniaxial anisotropy Ku can be estimated from the slope and the intercepts of the extrapolated straight lines for different directions of H//. This method is very simple and may be applied to films whose crystallographic axes in the film plane are unknown. With an adequate choice of the azimuth of the in-plane field, K1 has been estimated with an accuracy of 30%.
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