Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 23: Skyrmions 2 (joint session MA/KFM)

KFM 23.10: Vortrag

Donnerstag, 8. September 2022, 11:45–12:00, H37

Real-space determination of the isolated magnetic skyrmion deformation under electric current flowFehmi S. Yasin1, •Jan Masell1,2, Kosuke Karube1, Akiko Kikkawa1, Yasujiro Taguchi1, Yoshinori Tokura1,3, and Xiuzhen Yu11RIKEN CEMS, Wako, Japan — 2Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 3University of Tokyo, Tokyo, Japan

The effect of electric current on topological magnetic skyrmions, such as the current-induced deformation of isolated skyrmions, is of fundamental interest. The deformation has consequences ranging from perturbed dynamics to modified packing configurations. [1] We measure the current-driven real-space deformation of isolated, pinned skyrmions within CoZn at room temperature. We observe that the skyrmions are surprisingly soft, readily deforming during electric current application into an elliptical shape with a well-defined deformation axis. We find that this axis rotates towards the current direction, in agreement with our simply Thiele-based theoretical analysis. We quantify the average eccentricity and how the skyrmion size expands during current application. This first evaluation of in-situ electric current-induced skyrmion deformation paints a clearer picture of spin-polarized electron-skyrmion interactions and may prove essential when designing spintronic devices.

[1] J. Masell, D.R. Rodrigues, B.F. McKeever, and K. Everschor-Sitte, Phys. Rev. B 101, 214428 (2020). [2] Under review.

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