%0 Journal Article %K Laser spectroscopy %K Excited states %K Applied magnetic fields %K Collective modes %K Gilbert damping %K Helical state %K Itinerant magnets %K Lower frequencies %K Magnetic electrodes %K Time-resolved optical spectroscopy %K Time-resolved spectroscopy %K Damping %A J.D Koralek %A D Meier %A J.P Hinton %A A Bauer %A S.A Parameswaran %A A Vishwanath %A Ramamoorthy Ramesh %A R.W Schoenlein %A C Pfleiderer %A J Orenstein %B Physical Review Letters %D 2012 %G eng %R 10.1103/PhysRevLett.109.247204 %T Observation of coherent helimagnons and gilbert damping in an itinerant magnet %V 109