Realization of Semiconducting Layered Multiferroic Heterojunctions via Asymmetrical Magnetoelectric Coupling

Abstract

Two-dimensional (2D) semiconducting multiferroics that can effectively couple magnetic and polarization (P) orders have great interest for both fundamental research and technological applications in nanoscale, which are, however, rare in nature. In this study, we propose a general mechanism to realize semiconducting 2D multiferroics via vdW heterojunction engineering, as demonstrated in a typical heterostructure consisting of magnetic bilayer CrI3 (bi-CrI3) and ferroelectric monolayer In2Se3. Interestingly, the novel indirect orbital coupling between Se 4p and Cr 3d orbitals, intermediated by the interfacial I 5p orbitals, are switchable in the opposite P configurations, resulting in an unexpected mechanism of strong asymmetrical magnetoelectric coupling. Therefore, along with the noticeable ferroelectric energy barrier induced by In2Se3, the realization of opposite magnetic orders in opposite P configurations can eventually result in the novel multiferroicity in bi-CrI3/In2Se3. Finally, we demonstrate that our mechanism can generally be applied to design other vdW multiferroics even with tunable layer thickness.

arXiv comment11pages, 4 figures

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• 2D magnetoelectric multiferroics in MnSTe/In2Se3 heterobilayer with ferroelectrically controllable skyrmions
• Ferroelectrically switchable magnetic multistates in MnBi${}_2$Te${}_4$(Bi${}_2$Te${}_3$)${}_n$ and MnSb${}_2$Te${}_4$(Sb${}_2$Te${}_3$)${}_n$ (n = 0, 1) thin films
• Ferroelectric topological superconductor
• Enhanced magnetoelectric coupling in two-dimensional hybrid multiferroic heterostructures
• Magnetoelectricity in two-dimensional materials
• Manipulation of magnetic anisotropy of 2D magnetized graphene by ferroelectric In${}_2$Se${}_3$