Topological skyrmions in monolayer multiferroic MoPtGe2S6
arxiv(2024)
摘要
Two-dimensional (2D) multiferroic materials with coexisting ferroelectricity
and ferromagnetism have garnered substantial attention for their intriguing
physical properties and diverse promising applications in spintronics. For
example, multiferroic materials with electronically controlled broken central
symmetry provide a versatile platform for designing and manipulating
topological skyrmions and diverse spintronic applications. Here, we investigate
the complex magnetic properties of room-temerature multiferroic material
MoPtGe2S6 and its electrical control of topological skyrmions using
first-principles calculations and atomistic micromagnetic simulations. A
sizable Dzyaloshinskii-Moriya interaction (DMI) (2.1 meV) is found in the
multiferroic material MoPtGe2S6 with an electrically polarized ground state.
The magnetic skyrmions can be stabilized in monolayer MoPtGe2S6 under zero
magnetic field, and the chirality of skyrmions can be reversed with electric
field-induced flipping of electrical polarization due to the reversed chirality
of the DMI. Furthermore, an external magnetic fielc can reverse the
magnetization direction and topological charge of the skyrmions as well as tune
the size of skyrmions. These results demonstrate that the monolayer MoPtGe2S6
can enrich the 2D skyrmion community and pave the way for electronically
controlled spintronic devices.
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