Journal
NATURE MATERIALS
Volume 20, Issue 3, Pages 341-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41563-020-00821-3
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Funding
- Department of Energy, Office of Basic Energy Sciences [DESC0002220]
- Office of Naval Research [N00014-17-1-2818]
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The Dzyaloshinskii-Moriya interaction is a magnetic interaction originated from spin-orbit coupling, which can be used to explain technological phenomena in ferroelectrics and multiferroics.
The Dzyaloshinskii-Moriya interaction (DMI) between two magnetic moments mi and mj is of the form D-ij. (m(i) x m(j)). It originates from spin-orbit coupling, and is at the heart of fascinating phenomena involving non-collinear magnetism, such as magnetic topological defects (for example, skyrmions) as well as spin-orbit torques and magnetically driven ferroelectricity, that are of significant fundamental and technological interest. In sharp contrast, its electric counterpart, which is an electric DMI characterized by its D-ij' I strength and describing an interaction between two polar displacements ui and uj, has rarely been considered, despite the striking possibility that it could also generate new features associated with non-collinear patterns of electric dipoles. Here we report first-principles simulations combined with group theoretical symmetry analysis which not only demonstrate that electric DMI does exist and has a one-to-one correspondence with its magnetic analogue, but also reveals a physical source for it. These findings can be used to explain and/or design phenomena of possible technological importance in ferroelectrics and multiferroics.
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