Observation of coherent helimagnons and gilbert damping in an itinerant magnet

J. D. Koralek; D. Meier; J. P. Hinton; A. Bauer; S. A. Parameswaran; A. Vishwanath; R. Ramesh; R. W. Schoenlein; C. Pfleiderer; J. Orenstein

doi:10.1103/PhysRevLett.109.247204

Observation of coherent helimagnons and gilbert damping in an itinerant magnet

J. D. Koralek, D. Meier, J. P. Hinton, A. Bauer, S. A. Parameswaran, A. Vishwanath, R. Ramesh, R. W. Schoenlein, C. Pfleiderer, J. Orenstein

Chair of Experimental Physics on the Topology of Correlated Systems

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22 Scopus citations

Abstract

We study the magnetic excitations of itinerant helimagnets by applying time-resolved optical spectroscopy to Fe_0.8Co_0.2Si. 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.

Original language	English
Article number	247204
Journal	Physical Review Letters
Volume	109
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.109.247204
State	Published - 12 Dec 2012

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10.1103/PhysRevLett.109.247204

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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.",

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AU - Koralek, J. D.

AU - Meier, D.

AU - Hinton, J. P.

AU - Bauer, A.

AU - Parameswaran, S. A.

AU - Vishwanath, A.

AU - Ramesh, R.

AU - Schoenlein, R. W.

AU - Pfleiderer, C.

AU - Orenstein, J.

PY - 2012/12/12

Y1 - 2012/12/12

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.

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.

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VL - 109

JO - Physical Review Letters

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ER -

Observation of coherent helimagnons and gilbert damping in an itinerant magnet

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