SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Posters Magnetism II
MA 5.7: Poster
Dienstag, 28. September 2021, 10:00–13:00, P
Spin-transfer torque driven motion, deformation, and instabilities of magnetic skyrmions at high currents — •Jan Masell1, Davi R. Rodrigues2, and Karin Everschor-Sitte2 — 1RIKEN CEMS, Wako, Japan — 2University of Duisburg-Essen, Duisburg, Germany
Magnetic skyrmions are whirls which are characterized by a topological winding number. They have gained massive attention due to this real-space topological property and other features like possible nanometer size, extraordinary stability, or easy manipulation by electrical currents or other means. Therefore, various proposals emerged how skyrmions might serve as mobile information carriers in future information technology.
When considering skyrmions driven by spin-transfer torque (STT), it is usually assumed that distortions due to the current are small.
We have simulated STT-driven skyrmions with ultra high precision and quantitatively studied the distortion by STT in the entire stability regime up to the ferromagnetic instability. We find analytical expressions for the distortion of skyrmions, which is quadratic in the current, as well as for the STT-induced elliptical instability which destroys the skyrmion. We show numerically that for large enough Gilbert damping, however, stable but distorted "shooting star" skyrmion solutions are possible in regimes even above the elliptical instability. [1]
[1] J. Masell, D. R. Rodrigues, B. F. McKeever & K. Everschor-Sitte, Phys. Rev. B 101, 214428 (2020)