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TT: Fachverband Tiefe Temperaturen

TT 35: Cooperative Phenomena: Spin Structures and Magnetic Phase Transitions (joint session MA/TT)

TT 35.6: Talk

Tuesday, March 10, 2026, 15:15–15:30, POT/0151

Depinning by shaking of skyrmions by oscillating magnetic fields — •Rajendra Loke¹, Alla Bezvershenko², Petra Becker Bohaty³, Achim Rosch², and Joachim Hemberger¹ — ¹II. Physikalisches Institut, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany — ²Institut for Theoretical Physics, University of Cologne , Zülpicher Str. 77, 50937 Cologne, Germany — ³Institut for Geology und Mineralogy, University of Cologne , Zülpicher St. 49b, 50674 Cologne, Germanyy

Here we present our recent result on shaking the skyrmion lattice by oscillating transvers magnetic field. When a transvers field is applied in addition to the longitudinal external field, skyrmion strings try to align themselves parallel to the effective field. To do so, the tips of the skyrmion strings have to move large distances and thus have to overcome pinning forces before being able to follow the field lines. We employ linear and non-linear AC susceptometry as experimental probe. The signature of this pinning-depinning transition is observable as contribution to the magnetic susceptibility, to the magnetic loss, and as well in the higher harmonic susceptibility. According to theoretical predictions, due to the chiral nature of the material the depinning is connected to translational motion of the skyrmions.

[1] Jan Müller et al. PhysRevLett.119.137201 (2017) [2] Felix Rucker et al. arXiv: 2504.01133v1 [3] Nina del Ser et al. SciPost Phys. 15, 065 (2023).

Keywords: Skyrmions; Shakking; De-pinnig; higher harmonics; chirality