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Observation of coherent helimagnons and gilbert damping in an itinerant magnet.
Koralek, J D; Meier, D; Hinton, J P; Bauer, A; Parameswaran, S A; Vishwanath, A; Ramesh, R; Schoenlein, R W; Pfleiderer, C; Orenstein, J.
Afiliação
  • Koralek JD; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. jdkoralek@lbl.gov
Phys Rev Lett ; 109(24): 247204, 2012 Dec 14.
Article em En | MEDLINE | ID: mdl-23368372
ABSTRACT
We study the magnetic excitations of itinerant helimagnets by applying time-resolved optical spectroscopy to Fe(0.8)Co(0.2)Si. 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 Gilbert damping, revealing the versatility of spin dynamics in chiral magnets.
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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2012 Tipo de documento: Article País de afiliação: Estados Unidos
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2012 Tipo de documento: Article País de afiliação: Estados Unidos