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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

Research Areas

Ramesh Lab