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Updated: May 14, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
Observation of coherent helimagnons and gilbert damping in an itinerant magnet
J D Koralek1, D Meier, J P Hinton
1Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. jdkoralek@lbl.gov
Abstract:
We study the magnetic excitations of itinerant helimagnets by applying time-resolved optical spectroscopy to Fe(0.8)Co(0.2)Si. 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.
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