Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 37: Skyrmions III

MA 37.9: Talk

Thursday, March 21, 2024, 11:45–12:00, EB 301

Unravelling the significance of higher-order exchange interactions for skyrmion stability in monolayer MnSeTe — •Megha Arya¹, Lionel Calmels¹, Rémi Arras¹, Soumyajyoti Haldar², Stefan Heinze², and Dongzhe Li¹ — ¹CEMES, Université de Toulouse, CNRS, 29 rue Jeanne Marvig, F-31055 Toulouse, France — ²Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstrasse 15, 24098 Kiel, Germany

Magnetic skyrmions in atomically thin van der Waals (vdW) materials provide an ideal playground to push skyrmion technology to the single-layer limit. Here, we investigate the intrinsic magnetic skyrmions in a monolayer Janus vdW magnet, MnSeTe, by first-principles calculations combined with atomistic spin simulations. A very large Dzyaloshinskii-Moriya interaction (DMI) is observed due to the intrinsic broken inversion symmetry and strong spin-orbit coupling for monolayer MnSeTe, which is in agreement with the literature. We will show that the interplay between the large DMI, the exchange coupling, and the magnetic anisotropy energy allows stabilizing zero-field nanoscale skyrmions in monolayer MnSeTe, becoming technologically competitive. We further show that the nanoscale skyrmions have moderate energy barriers protecting skyrmions against annihilation. Finally, we unravel the role of higher-order exchange interactions - which have so far been overlooked - as they can play an intriguing role in the stability of skyrmions.

Keywords: Spintronics; magnetic skyrmions; 2D van der Waals magnets; Dzyaloshinskii-Moriya interaction; higher-order exchange interactions