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arXiv · 2511.07359

Spatio-temporal migration of antiferromagnetic domain walls in Sr2IrO4

Ian Robinson·David Yang·Ross Harder·Dina Sheyfer·Longlong Wu·Jack Griffiths·Emil Bozin·Mark P. M. Dean·Jialun Liu·Hengdi Zhao·Gang Cao·Angel Rodriguez-Fernandez·Jan-Etienne Pudell·Roman Shayduk·James Wrigley·Alexey Zozulya·Rustam Rysov·Aliaksandr Leonau·Ulrike Boesenberg·Joerg Hallmann·Anders Madsen
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Abstract

By laser pump-probe time-resolved coherent magnetic X-ray diffraction imaging, we have measured the migration velocity of antiferromagnetic domain walls in the Mott insulator Sr2IrO4 at 100 K. During the laser-induced demagnetization, we observe domain walls moving at 3x10^6 m/s, significantly faster than acoustic velocities. This is understood to arise from a purely electronic spin contribution to the magnetic structure without any role for coupling to the crystal lattice.

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Ian Robinson, David Yang, Ross Harder, Dina Sheyfer, Longlong Wu, Jack Griffiths, Emil Bozin, Mark P. M. Dean, Jialun Liu, Hengdi Zhao, Gang Cao, Angel Rodriguez-Fernandez, Jan-Etienne Pudell, Roman Shayduk, James Wrigley, Alexey Zozulya, Rustam Rysov, Aliaksandr Leonau, Ulrike Boesenberg, Joerg Hallmann, Anders Madsen. 2025-11-10. Spatio-temporal migration of antiferromagnetic domain walls in Sr2IrO4. https://doi.org/10.1103/f939-clb5

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