In Sr2IrO4, laser-pumped antiferromagnetic domain walls are inferred to migrate at 3×10^6 m/s, faster than sound, implying purely electronic spin motion without lattice coupling.
Sr2+ ions are blue, O2- ions are red and the Ir4+ ions are at centers of the canted octahedra
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Spatio-temporal migration of antiferromagnetic domain walls in Sr2IrO4
In Sr2IrO4, laser-pumped antiferromagnetic domain walls are inferred to migrate at 3×10^6 m/s, faster than sound, implying purely electronic spin motion without lattice coupling.