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Observation of coherent helimagnons and gilbert damping in an itinerant magnet

Publication Type

Journal Article

Authors

Koralek, J.D, D Meier, J.P Hinton, A Bauer, S.A Parameswaran, A Vishwanath, Ramamoorthy Ramesh, R.W Schoenlein, C Pfleiderer, J Orenstein

DOI

10.1103/PhysRevLett.109.247204

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 "format"to address the fundamental magnetic relaxation processes by directly measuring the Gilbert damping, revealing the versatility of spin dynamics in chiral magnets. © 2012 American Physical Society.

Journal

Physical Review Letters

Volume

109

Year of Publication

2012

ISSN

00319007

Notes

cited By 11

Research Areas

Ramesh Lab