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We study the magnetic excitations of itinerant helimagnets by applyingtime-resolved optical spectroscopy to Fe0.8Co0.2Si. Optically excitedoscillations of the magnetization in the helical state are found to disperse tolower frequency as the applied magnetic field is increased; the fingerprint ofcollective modes unique to helimagnets, known as helimagnons. The use oftime-resolved spectroscopy allows us to address the fundamental magneticrelaxation processes by directly measuring the Gilbert damping, revealing theversatility of spin dynamics in chiral magnets. (*These authors contributedequally to this work)

Observation of Coherent Helimagnons and Gilbert damping in an Itinerant Magnet