Bending skyrmion strings under two-dimensional thermal gradients

Kejing Ran, Wancong Tan, Xinyu Sun, Yizhou Liu, Robert M. Dalgliesh, Nina-Juliane Steinke, Gerrit Laan, Sean Langridge, Thorsten Hesjedal and Shilei Zhang ()
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Kejing Ran: ShanghaiTech University
Wancong Tan: ShanghaiTech University
Xinyu Sun: ShanghaiTech University
Yizhou Liu: RIKEN Center for Emergent Matter Science (CEMS)
Robert M. Dalgliesh: Rutherford Appleton Laboratory
Nina-Juliane Steinke: Institut Laue-Langevin
Gerrit Laan: Diamond Light Source
Sean Langridge: Rutherford Appleton Laboratory
Thorsten Hesjedal: University of Oxford
Shilei Zhang: ShanghaiTech University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Magnetic skyrmions are topologically protected magnetization vortices that form three-dimensional strings in chiral magnets. With the manipulation of skyrmions being key to their application in devices, the focus has been on their dynamics within the vortex plane, while the dynamical control of skyrmion strings remained uncharted territory. Here, we report the effective bending of three-dimensional skyrmion strings in the chiral magnet MnSi in orthogonal thermal gradients using small angle neutron scattering. This dynamical behavior is achieved by exploiting the temperature-dependent skyrmion Hall effect, which is unexpected in the framework of skyrmion dynamics. We thus provide experimental evidence for the existence of magnon friction, which was recently proposed to be a key ingredient for capturing skyrmion dynamics, requiring a modification of Thiele’s equation. Our work therefore suggests the existence of an extra degree of freedom for the manipulation of three-dimensional skyrmions.

Date: 2024
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DOI: 10.1038/s41467-024-49288-9

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