Giant Magnetoelectric Coupling in Asymmetric Ferromagnet-Ferroelectric-Metal Trilayers: Toward Electric Control of Magnetization
ORAL
Abstract
By examining electron screening at the surface of ferromagnetic metals and semiconductors, we propose an asymmetric ferromagnet-ferroelectric-metal trilayer to realize giant magnetoelectric effect. The origin is the strengthened accumulation of spin-polarized screening electrons at the ferromagnet-ferroelectric interface. Including the electrostatic energy from such spin-polarized charges in the Laudau-Devibshire free energy for ferroelectics, a magnetoelectric coupling term $\chi P^2M^2$ is derived, and consequently an electric control of magnetization hysteries is observed. The dependence of $\chi$ as well as the ME effect on the choice of materials is discussed for some real ferromagnets.
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Authors
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Tianyi Cai
University of Texas at Austin
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Sheng Ju
Department of Physics, Suzhou University, Suzhou, 215006, China
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Junren Shi
Institute of Physics, Chinese Academy of Sciences, China, Institute of Physics and ICQS, Chinese Academy of Sciences, Beijing 100080, China
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Enge Wang
Chinese Academy of Sciences, ICQS and Institute of Physics, Chinese Academy of Sciences, Institute of Physics and ICQS, Chinese Academy of Sciences, Beijing 100080, China
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Zhenya Li
Department of Physics, Suzhou University, Suzhou, 215006, China
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Qian Niu
Department of Physics, The University of Texas at Austin, The University of Texas at Austin, University of Texas at Austin