@article{33451,
  keywords = {Laser spectroscopy, Excited states, Applied magnetic fields, Collective modes, Gilbert damping, Helical state, Itinerant magnets, Lower frequencies, Magnetic excitations, Time-resolved optical spectroscopy, Time-resolved spectroscopy, Damping},
  author = {J.D Koralek and D Meier and J.P Hinton and A Bauer and S.A Parameswaran and A Vishwanath and Ramamoorthy Ramesh and R.W Schoenlein and C Pfleiderer and J Orenstein},
  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 "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.},
  year = {2012},
  journal = {Physical Review Letters},
  volume = {109},
  number = {24},
  issn = {00319007},
  doi = {10.1103/PhysRevLett.109.247204},
  note = {cited By 11},
  language = {eng},
}