Physics

Multi-step topological transitions among meron and skyrmion crystals in a centrosymmetric magnet

H. Yoshimochi, R. Takagi, et al.

Discover the fascinating world of multi-step topological transitions as researchers H. Yoshimochi and colleagues unveil the periodic lattices of merons and skyrmions in the centrosymmetric magnet GdRu₂Ge₂. Their groundbreaking work combines resonant X-ray and neutron scattering with electron transport measurements, revealing remarkably small structures driven by competing interactions. This research could pave the way for innovative nanometric magnetic quasi-particles.

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Abstract

This paper reports the experimental discovery of multi-step topological transitions among various meron and skyrmion crystal states in the centrosymmetric magnet GdRu₂Ge₂. Using resonant X-ray and neutron scattering, along with electron transport measurements, the researchers found that this compound exhibits periodic lattices of elliptic skyrmions, meron/anti-meron pairs, and circular skyrmions as a function of external magnetic field. These structures are remarkably small (2.7 nm diameter) and the transitions are well-reproduced by a theoretical model incorporating competing RKKY interactions at different wave vectors. The findings suggest that centrosymmetric magnets with competing interactions are a promising platform for creating a wide variety of nanometric magnetic quasi-particles.

Publisher

Nature

Published On

Authors

H. Yoshimochi, R. Takagi, J. Ju, N. D. Khanh, H. Saito, H. Sagayama, H. Nakao, S. Itoh, Y. Tokura, T. Arima, S. Hayami, T. Nakajima, S. Seki

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