Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Weber, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Waizner, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tucker, G. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Georgii, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kugler, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bauer, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pfleiderer, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garst, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Boeni, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Keywords Language EXCITATIONS; RESONANCE; SPECTRUM; PHASE Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18302