Abstract
Based on the first-principles prediction, we report the magnetoelectric coupling effect in two-dimensional multiferroic bilayer . The ground-state -type stacking breaks space inversion symmetry, therefore introducing a spontaneous polarization perpendicular to the layer plane. We further reveal that the out-of-plane ferroelectric polarization of bilayer can be reversed upon interlayer sliding of an in-plane translation. Each layer has a ferromagnetic state with an opposite magnetic moment between two antiferromagnetically ordered layers. We found that ferroelectricity and antiferromagnetism can be coupled together by a ferrovalley in bilayer to realize electronic control of magnetism. Remarkably, a net magnetic moment is generated by reducing the interlayer distance, and an electric field is able to achieve linear and second-order nonlinear magnetoelectric coupling in bilayer .
- Received 3 November 2019
- Revised 23 April 2020
- Accepted 28 October 2020
DOI:https://doi.org/10.1103/PhysRevLett.125.247601
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