Eur. Phys. J. B (2013) 86: 342
https://doi.org/10.1140/epjb/e2013-40430-7

Regular Article

Homogeneous and Goldstone modes of spin excitations in Cr_1/3NbS₂ helimagnet

Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, Russia

^a e-mail: mushenokf@ya.ru

Received: 24 April 2013
Received in final form: 16 June 2013
Published online: 1 August 2013

Abstract

Contributions of homogeneous and Goldstone modes of the spin precession were distinguished in FMR spectra of Cr_1/3NbS₂ chiral helimagnet. The resonance field of homogeneous mode is determined by uniaxial magnetic anisotropy. The resonance field of Goldstone mode is determined by six-fold anisotropy in basal plane. For the first time, it has been shown experimentally that effective excitation of Goldstone mode is realized only when microwave magnetic field vector h is perpendicular to wave vector of magnetic structure Q.