Large converse magnetoelectric effect in Sm doped Pb(Mg_1/3Nb_2/3)-PbTiO₃ and NiFe₂O₄ laminate composite

The magnetoelectric bilayer composite Sm-doped Pb(Mg1/3Nb2/3)-PbTiO3/NiFe2O4 (Sm:PMN-PT/NFO) developed in this study exhibits a converse magnetoelectric coefficient (alpha(CME)) of 0.34 G cm/V at resonance. This value is at least an order of magnitude higher than any previously reported alpha(CME )for polycrystalline ferrite-based laminate composites. The large CME coefficients in both dc- and self-biased modes are attributed to the high transverse piezoelectric coefficient (d(31) similar to -421 pC/N) of the piezoelectric phase Sm:PMN-PT. High converse magnetoelectric coefficient and characteristic advantages of ferrite-based magnetoelectric (ME) materials such as low eddy current losses make this composite a potential candidate for the ME devices operating in the converse mode. In particular, its performance characteristics for two applications -voltage to current converter, and as a magnetic switch -have been investigated. The laminate composite exhibits current to voltage conversion performance of 14 mA/V at the resonance frequency. The performance characteristics as a magnetic switch show that the bi-stable states separated by 25 G can be realized through an AC signal of 5V. (C) 2020 Elsevier B.V. All rights reserved.