SKM 2021 – wissenschaftliches Programm
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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: Hauptvortrag
Dienstag, 28. September 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. Back1,4 — 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.