SKM 2021 – scientific programme

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SYMS: Symposium Novel phases and dynamical properties of magnetic skyrmions

SYMS 1: Novel phases and dynamical properties of magnetic skyrmions

SYMS 1.2: Invited Talk

Tuesday, September 28, 2021, 10:30–11:00, Audimax 2

Microwave spectroscopy of the skyrmionic states in a chiral magnetic insulator — •Aisha Aqeel¹, Jan Sahliger¹, Takuya Taniguchi¹, Stefan Maendl¹, Denis Mettus¹, Helmuth Berger², Andreas Bauer¹, Markus Garst³, Christian Pfleiderer¹, and Christian H. Back^1,4 — ¹Technical University of Munich, Garching, Germany — ²École polytechnique Federale de Lausanne, Lausanne, Switzerland — ³Karlsruhe Institute of Technology, Karlsruhe, Germany — ⁴Munich Center for Quantum Science and Technology (MCQST), Munich, Germany

In the cubic chiral magnet Cu2OSeO3 a low-temperature skyrmion state (LTS) and a concomitant tilted conical state are observed for magnetic fields applied along specific crystallographic directions (<100>). In this work, we investigated the dynamic resonances of these novel magnetic states. We have used the broadband microwave spectroscopy to study these resonance modes. By comparing the results to linear spin-wave theory, we clearly identify the gyrational and breathing modes associated with the LTS, as well as the hybridization of the breathing mode with a dark octupole gyration mode mediated by the magnetocrystalline anisotropies. Interestingly, our findings suggest that under decreasing fields the hexagonal skyrmion lattice becomes unstable, resulting in the formation of elongated skyrmions.