Magnetodielectric Effect in Relaxor Ceramic Pb(In_0.5Nb_0.5)O₃

Abstract

We have studied the magnetodieletric response of polycrystalline samples of the perovskite relaxor ferroelectric Pb(In_0.5Nb_0.5)O₃. Dielectric anomalies of ϵ′ and ϵ′ are clearly observed at the phase transition from ferroelectric rhombohedral phase to rhombic antiferroelectric phase (T_C = 36°C) and then at the phase transition from antiferroelectric phase to cubic paraelectric phase (T_N = 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.

Keywords:

• Magnetodielectric effect
• relaxor
• magnetic moment of domain wall

Acknowledgment

The work was supported by the Russian Foundation for Basic Research, project no. 13-02-00663.