Abstract
We have studied the magnetodieletric response of polycrystalline samples of the perovskite relaxor ferroelectric Pb(In0.5Nb0.5)O3. Dielectric anomalies of ϵ′ and ϵ′ are clearly observed at the phase transition from ferroelectric rhombohedral phase to rhombic antiferroelectric phase (TC = 36°C) and then at the phase transition from antiferroelectric phase to cubic paraelectric phase (TN = 175°C). At room temperature both ϵ′ and ϵ′ are decreased under an applied static magnetic field at all measuring frequencies in the range of 25 Hz – 5 kHz. Magnetocapacitance of −15% was observed at 25 Hz and it is decreased to −1.5% at 5 kHz. The magnetodielectric effect in the ferroelectric state appears to originate from interaction of the external magnetic field with magnetic moments of moving ferroelectric domain walls.
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