Efficient motion of 90^∘ domain walls in Mn_2Au via pure optical torques
arxiv(2024)
摘要
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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