Helical Spin Resonance in the Cubic B-20 Fe_<0.8>Co_<0.2>Si Single Crystal with a Long-Period Helical Spin Structure

概要

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Electron spin resonance has been studied at various frequencies (6-24 GHz) on B-20 Fe...Co...Si single crystal, which has a long-period helical spin structure (HSS) witha cone-ferromagnetic transition at a critical field H.. Three resonance absorptionshave been observed clearly: (a) behaving like a ferromagnetic resonance, (b) occuringaround H. and (c) assigned to be a helical spin resonance. The resonance frequency of(c) decreases with increasing the magnetic field. Such dependence does not agree withthe resonance theory for a HSS resulting from a competition between symmetric exchange interactions (SEI's), but it agrees well with that for a HSS resulting from acompetition between the SET and the antisymmetric exchange interaction. The pre-sent results together with our previous ones give the evidence that the HSS inFe...Co...Si is of the latter ty)ce.
社団法人日本物理学会の論文
1989-03-15