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Observation of Coherent Helimagnons and Gilbert damping in an Itinerant Magnet

We study the magnetic excitations of itinerant helimagnets by applying time-resolved optical spectroscopy to Fe0.8Co0.2Si. Optically excited oscillations of the magnetization in the helical state are found to disperse to lower frequency as the applied magnetic field is increased; the fingerprint of collective modes unique to helimagnets, known as helimagnons. The use of time-resolved spectroscopy allows us to address the fundamental magnetic relaxation processes by directly measuring the Gilbert damping, revealing the versatility of spin dynamics in chiral magnets. (*These authors contributed equally to this work)

preprint2012arXivOpen access
J. D. KoralekD. MeierJ. P. HintonA. BauerS. A. ParameswaranA. VishwanathR. RameshR. W. SchoenleinC. PfleidererJ. Orenstein
cond-mat.str-elcond-mat.mtrl-sci
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J. D. KoralekD. MeierJ. P. HintonA. BauerS. A. ParameswaranA. VishwanathR. RameshR. W. SchoenleinC. PfleidererJ. Orenstein

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