Efficient motion of 90^∘ domain walls in Mn₂Au via pure optical torques

2024/05/15 by Paul-Iulian Gavriloaea, Gavriloaea, Paul-Iulian, Jackson L. Ross +13
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Advanced Electron Microscopy Techniques and Applications #FOS: Physical sciences #Magnetic properties of thin films #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Microtubule and mitosis dynamics

paper · pdf · doi:10.48550/arxiv.2405.09253

openalex publication_date 2024/05/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Discovering alternative ways to drive domain wall (DW) dynamics is crucial for advancing spintronic applications. Here we demonstrate via atomistic spin dynamics simulations that optical torques can efficiently drive 90^∘ DWs in the Mn2Au antiferromagnet but their spatial symmetry forbids the motion of 180^∘ walls. In the steady-state regime, the kinematics display special relativity signatures accessed for low laser intensities. At velocities higher than the magnonic limit, the DW enters a proliferation regime in which part of its relativistic energy is invested into the nucleation of novel magnetic textures. Our investigation contributes towards the fundamental understanding of opto-magnetic effects, supporting the development of next generation, all-optically controlled antiferromagnetic spintronics.

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