期刊
PHYSICAL REVIEW B
卷 82, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.052401
关键词
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资金
- International Max Planck Research School for Science and Technology of Nanostructures in Halle
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.
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