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- W2012741350 abstract "The asymmetric spin-wave dispersion relation observed recently [Zakeri et al., Phys. Rev. Lett. 104, 137203 (2010)], is explained within a quantum model consisting of an anisotropic Heisenberg coupling and the Dzyaloshinski-Moriya interaction (DMI). Applying a transformation of the spin operators into a representation without fixed quantization axis, a Green's function technique for finite temperatures allows to obtain the spin-wave dispersion for various magnetic spiral structures including cycloidal and conical ones. In case of vanishing anisotropy, the DMI drives an incommensurate antiferromagnetic alignment forming a cycloidal spin spiral. The spin-wave dispersion is symmetric. For nonzero anisotropy, the spins are aligned in a transverse conical spiral and the dispersion becomes asymmetric in agreement with the experimental observation. The asymmetry is reduced with increasing temperature." @default.
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- W2012741350 date "2010-08-11" @default.
- W2012741350 modified "2023-09-25" @default.
- W2012741350 title "Asymmetric dispersion relation in spin-spiral structures" @default.
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- W2012741350 doi "https://doi.org/10.1103/physrevb.82.052401" @default.
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