Weber, T., Waizner, J., Tucker, G. S., Georgii, R., Kugler, M., Bauer, A., Pfleiderer, C., Garst, M. and Boeni, P. (2018). Field dependence of nonreciprocal magnons in chiral MnSi. Phys. Rev. B, 97 (22). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Spin waves in chiral magnetic materials are strongly influenced by the Dzyaloshinskii-Moriya interaction, resulting in intriguing phenomena like nonreciprocal magnon propagation and magnetochiral dichroism. Here, we study the nonreciprocal magnon spectrum of the archetypical chiral magnet MnSi and its evolution as a function of magnetic field covering the field-polarized and conical helix phase. Using inelastic neutron scattering, the magnon energies and their spectral weights are determined quantitatively after deconvolution with the instrumental resolution. In the field-polarized phase the imaginary part of the dynamical susceptibility. chi ''(epsilon,q) is shown to be asymmetric with respect to wave vectors q longitudinal to the applied magnetic field H, which is a hallmark of chiral magnetism. In the helimagnetic phase, chi ''(epsilon,q) becomes increasingly symmetric with decreasing H due to the formation of helimagnon bands and the activation of additional spin-flip and non-spin-flip scattering channels. The neutron spectra are in excellent quantitative agreement with the low-energy theory of cubic chiral magnets with a single fitting parameter being the damping rate of spin waves.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Weber, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Waizner, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tucker, G. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Georgii, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kugler, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bauer, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pfleiderer, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garst, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Boeni, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-183025
DOI: 10.1103/PhysRevB.97.224403
Journal or Publication Title: Phys. Rev. B
Volume: 97
Number: 22
Date: 2018
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
EXCITATIONS; RESONANCE; SPECTRUM; PHASEMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/18302

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