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We report experimentally and theoretically the effect of phase transformation on the converse magnetoelectric (CME) properties of a heterostructure formed by one layer of piezoelectric 0.7PbMg₁/₃Nb₂/₃O₃-0.3PbTIO₃(PMN-PT)crystal sandwiched between two layers of ferromagnetic shape memory Ni₄₉.₂Mn₂₉.₆Ga₂₁.₂(Ni–Mn–Ga) crystal. The CME coefficient (αв) of the heterostructure remains minimally and relatively constant in the martensitic phase (<28 °C), attains its maximum value in the martensitic-austenitic phase transformation  (28–39 °C), and decreases gradually with increasing temperature in the austenitic phase (>39 °C). Giant resonance αв of 18.6 G/V is found at 32 °C under a very low bias magnetic field of 150 Oe.Department of Electrical EngineeringDepartment of Applied PhysicsAuthor name used in this publication: M. ZengAuthor name used in this publication: Siu Wing OrAuthor name used in this publication: Helen Lai Wa Cha

applied physics letters

Effect of phase transformation on the converse magnetoelectric properties of a heterostructure of Ni49.2Mn29.6Ga21.2 and 0.7PbMg1/3Nb2/3O3-0.3PbTiO3 crystals