Observation of Coherent Helimagnons and Gilbert damping in an Itinerant Magnet

Abstract

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)

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Cited by in corpus (9)

• Collective spin excitations of helices and magnetic skyrmions: review and perspectives of magnonics in non-centrosymmetric magnets
• Generic aspects of skyrmion lattices in chiral magnets
• Local dynamics of topological magnetic defects in the itinerant helimagnet FeGe
• History dependence of the magnetic properties of single-crystal Fe${}_{1-x}$Co${}_x$Si
• Microwave spectroscopy of the low-temperature skyrmion state in Cu2OSeO3
• Ferromagnetic resonance with magnetic phase selectivity by means of resonant elastic x-ray scattering on a chiral magnet
• Optically excited spin dynamics of thermally metastable skyrmions in Fe${}_{0.75}$Co${}_{0.25}$Si
• Disentangling Electronic, Lattice and Spin Dynamics in the Chiral Helimagnet Cr1/3NbS2
• Optical creation and annihilation of skyrmion patches in a bulk chiral magnet