Anisotropy of the magnetogyric ratio in hexagonal ferrites

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Abstract
Observations of ferromagnetic resonance at room temperature in several hexagonal ferrites have shown that the results can not be adequately described by a scalar magnetogyric ratio. Measurements were made on two compounds of the Y phase, with easy planes of magnetization, and compounds of the M, W, and X phases, which have easy axes of magnetization. In all materials the magnetogyric ratio may be described by a tensor having two components, g∥ and g⊥, measured parallel and perpendicular, respectively, to the hexagonal axis. g∥ is found to be constant for a given material, while g⊥ is magnetic field dependent, approaching g∥ at high fields. g‐factor anisotrpies as large as 7% were observed. Possible origins of these effects and applications to microwave devices are discussed.

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