SKM 2023 – scientific programme

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MA: Fachverband Magnetismus

MA 15: INNOMAG e.V. Prizes 2023 (Diplom-/Master and Ph.D. Thesis)

MA 15.4: Talk

Tuesday, March 28, 2023, 10:30–10:55, HSZ 401

The Turn of the Screw and the Slide of the Skyrmion — •Nina del Ser — Institute for Theoretical Physics, University of Cologne

We explore the non-equilibirum dynamics of chiral magnets driven by oscillating magnetic fields in the GHz regime. Universal activation of the magnets' translational and rotational Goldstone modes invites many exciting applications. Magnetic screws will turn, skyrmions will swim and skyrmion lattices will rotate. The magnetic Archimedean screw opens the door to new transport applications on the nano-scale, and is shown to be a very efficient electron pump even in the presence of disorder. At stronger driving, Floquet spin wave instabilities provoke the formation of a time quasicrystal, where the magnetisation oscillates at new incommensurate spatial and temporal frequencies. We also investigate the role of fractional charge topological charge in magnets. We show that such charges turn up for example in cubic magnets and in the fragments of exploding skyrmions or trapped between symmetry-broken domain walls. We show how their remarkable scattering properties can be used to build a magnon-powered fractional defect engine.