Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session A40: Skyrmions in Two Dimensional Systems
8:00 AM–10:48 AM,
Monday, March 15, 2021
Sponsoring
Units:
GMAG DMP
Chair: Lisa DeBeer-Schmitt, Oak Ridge National Lab
Abstract: A40.00007 : Skyrmions in twisted van der Waals magnets*
9:36 AM–9:48 AM
Live
Presenter:
Muhammad Akram
(Arizona State University)
Authors:
Muhammad Akram
(Arizona State University)
Onur Erten
(Arizona State University)
Dzyaloshinskii-Moriya interaction and external magnetic field. Here, we show that skyrmions can also be
stabilized in twisted moire superlattices with Dzyaloshinskii-Moriya interaction in the absence of an external
magnetic field. Our setup consists of a 2D ferromagnetic layer twisted on top of an antiferromagnetic substrate.
The coupling between the ferromagnetic layer and the substrate generates an effective alternating exchange
field. We find a large region of skyrmion crystal phase when the length scales of the moire periodicity and
skyrmions are compatible. Unlike chiral magnets under magnetic field, skyrmions in moire superlattices show
enhanced stability for the easy-axis (Ising) anisotropy which can be essential to realize skyrmions since most
van der Waals magnets possess easy-axis anisotropy.
*Muhammad Akram is supported by Fulbright scholarship and ASU startup grant and Onur Erten is supported by NSF-DMR-1904716. We acknowledge the ASU Research Computing Center for HPC resources.
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