TY - JOUR
KW - Laser spectroscopy
KW - Excited states
KW - Applied magnetic fields
KW - Collective modes
KW - Gilbert damping
KW - Helical state
KW - Itinerant magnets
KW - Lower frequencies
KW - Magnetic electrodes
KW - Time-resolved optical spectroscopy
KW - Time-resolved spectroscopy
KW - Damping
AU - J.D Koralek
AU - D Meier
AU - J.P Hinton
AU - A Bauer
AU - S.A Parameswaran
AU - A Vishwanath
AU - Ramamoorthy Ramesh
AU - R.W Schoenlein
AU - C Pfleiderer
AU - J Orenstein
AB - 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.
BT - Physical Review Letters
DO - 10.1103/PhysRevLett.109.247204
LA - eng
M1 - 24
N1 - cited By 11
N2 - 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.
PY - 2012
T2 - Physical Review Letters
TI - Observation of coherent helimagnons and gilbert damping in an itinerant magnet
VL - 109
SN - 00319007
ER -