Observation of Magnetic Excitations of Skyrmion Crystal in a Helimagnetic Insulator Cu_{2}OSeO_{3} |
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| Authors: | Y Onose Y Okamura S Seki S Ishiwata Y Tokura |
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| Institution: | Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan and Department of Basic Science, University of Tokyo, Tokyo 153-8902, Japan. |
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| Abstract: | We have investigated the low-energy dynamics of the triangular lattice of Skyrmions in a helimagnetic insulator Cu_{2}OSeO_{3} in terms of microwave response. We have observed two elementary excitations of the Skyrmion with different polarization characteristics: the counterclockwise circulating mode at 1?GHz with the magnetic field polarization parallel to the Skyrmion plane and the breathing mode at 1.5?GHz with a perpendicular magnetic field polarization. These modes reflect the topological nature of Skyrmions and may play a central role in the Skyrmion dynamics. |
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