Magnetism

Shape of the ferromagnetic resonance absorption band of textured powder samples of maghemite

V. O. Shein, A. V. Van'kevich, N. M. Borisova, A. G. Anders

V. N. Karazin Kharkiv National University

Abstract: The shape of the ferromagnetic resonance absorption band of powder microcrystalline ferrite $\gamma$-Fe$_2$O has been studied. Samples in the form of a ferromagnetic fluid have been subjected to preliminary particle orientation and frozen in a magnetic field. The shape of the absorption bands has been computer processed with allowance for the anisotropy of the shape of particles and their spatial cubic anisotropy, as well as for the contribution from nondispersed fraction of the bulk of the powder. Satisfactory agreement with the experiment has been obtained for several orientations of the measuring magnetic field with respect to the preliminary orientation.

Received: 18.04.2011

 English version: Physics of the Solid State, 2011, 53:12, 2450–2454

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