Magnetodielectric effect in Z-type hexaferrite

Abstract

The authors report on the magnetodielectric (MD) effect of Z-type hexaferrite Sr₃Co₂Fe₂₄O₄₁ at various temperatures and frequencies. A fairly large negative MD effect was observed with a peak near room temperature and a maximum at low frequencies. Analysis suggests that the MD effect shows a quadratic dependence on magnetization. The results were discussed by considering the magnetic field induced change of transverse conical spin structure and spin-phonon coupling. This work is helpful for understanding the MD effect in materials with complicated spin structures.

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