Enhanced self-biased direct and converse magnetoelectric effect in Pb(In_(1/2)Nb_(1/2))O_3-PbTiO_3/NiFe_2O_4 bi-layer laminate composite

摘要

The direct magnetoelectric (DME) effect and converse magnetoelectric (CME) effect are investigated in bi-layer ferroelectric [0.65 Pb(In_(1/2)Nb_(1/2))O_3-0.35 PbTiO_3]-ferrite [NiFe_2O_4] laminate composite prepared by epoxy bonding. The magnetoelectric (ME) properties of bi-layer composite is studied at low frequency (1 kHz) and at electromechanical resonance frequencies under external bias field (H_(dc)). The laminate composite shows a DME coefficient (α_(DME)) and CME coefficient (α_(CME)) of 103 mV/ (cm Oe) and 0.04 (mG cm)/V respectively at 1 kHz with a H_(dc) of 110 Oe. Moreover the α_(DME) and α_(CME) shows nonzero value in the absence of external bias field, which signifies the presence of self-biased ME effect in this laminate composite. Under resonance condition, ME coupling enhanced two orders of magnitude compared to low frequency value. A large self biased α_(DME) of 8 V/(cm Oe) and α_(CME) of 5 (mG cm)/V is achieved at electromechanical resonance.