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Document type:
Zeitschriftenaufsatz 
Author(s):
Koralek, J. D.; Meier, D.; Hinton, J. P.; Bauer, A.; Parameswaran, S. A.; Vishwanath, A.; Ramesh, R.; Schoenlein, R. W.; Pfleiderer, C.; Orenstein, J. 
Title:
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 Gilber...    »
 
Journal title:
Physical Review Letters 
Year:
2012 
Journal volume:
109 
Month:
dec 
Journal issue:
24 
Pages contribution:
247204