Abstract
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 (αB) 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 αB of 18.6 G/V is found at 32 °C under a very low bias magnetic field of 150 Oe.
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