Abstract
The magnetodielectric (MD) effects of epitaxial hexaferrite BaFe10.2Sc1.8O19 thin film have been investigated around room temperature. The frequency dependent dielectric constant and MD analysis at room temperature show that in the low frequency regime (f <100 Hz), the MD effect exists, but it is very small. When the frequency is higher than 1 kHz, two strong MD peaks exist which should be contributed by the magnetic field dependent sample/electrode interface polarizations (1 kHz < f < 100 kHz) and electric dipole rotations in the film (f > 100 kHz), respectively. Further temperature dependent MD analysis at 1 MHz shows that the magnetic-field-induced electric dipoles dominate the MD effect below the conical magnetic transition temperature (Tcone = 306 K), while the lattice-type dipoles dominate the MD effect above Tcone. The above findings further the potential applications of multiferroic hexaferrite thin films in the magnetoelectric devices.
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