Topological magneto-optical effect from skyrmion lattice

Yoshihiro D. Kato, Yoshihiro Okamura (), Max Hirschberger, Yoshinori Tokura and Youtarou Takahashi ()
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Yoshihiro D. Kato: University of Tokyo
Yoshihiro Okamura: University of Tokyo
Max Hirschberger: University of Tokyo
Yoshinori Tokura: University of Tokyo
Youtarou Takahashi: University of Tokyo

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract The magnetic skyrmion is a spin-swirling topological object characterized by its nontrivial winding number, holding potential for next-generation spintronic devices. While optical readout has become increasingly important towards the high integration and ultrafast operation of those devices, the optical response of skyrmions has remained elusive. Here, we show the magneto-optical Kerr effect (MOKE) induced by the skyrmion formation, i.e., topological MOKE, in Gd2PdSi3. The significantly enhanced optical rotation found in the skyrmion phase demonstrates the emergence of topological MOKE, exemplifying the light-skyrmion interaction arising from the emergent gauge field. This gauge field in momentum space causes a dramatic reconstruction of the electronic band structure, giving rise to magneto-optical activity ranging up to the sub-eV region. The present findings pave a way for photonic technology based on skyrmionics.

Date: 2023
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DOI: 10.1038/s41467-023-41203-y

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