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The converse magnetoelectric coupling in asymmetric granule/matrix composite film with Ni/PZT component
Authors:Bo Chen  Ning-Ning Su  Wen-Li Cui  Shi-Nong Yan
Institution:1. Department of Physics, School of Science, North University of China, TaiYuan 030051, China;2. School of Physics and Optoelectronic Engineering, Dalian University of Technology, DaLian 116024, China
Abstract:In this work, a type of asymmetric granule/matrix composite film is designed, where the Ni granule is dispersed in PZT matrix, meanwhile the top and bottom electrode is constituted by Au and SRO respectively. Predicted through the electrostatic screening model and mean field approximation, considerable electrostatic charge is induced on Ni granule surface by ferroelectric PZT polarization. Predicted through the spin splitting model and spherical shell approximation, both the magnetization and magnetic anisotropy of Ni granule are modulated by ferroelectric PZT polarization. As the volume fraction of Ni granule is increased, the electric modulation of magnetization and magnetic anisotropy is reduced and enhanced respectively. As the dimension of granule/matrix composite is varied, such modulation is retained. Due to the large area–volume ratio of nano-granule, this work benefits to realize the converse magnetoelectric coupling in nanoscale.
Keywords:Magnetoelectricity  Electric polarization  Magnetization  Magnetic anisotropy
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