Spin dynamics of the magnetocaloric compound MnFe4Si3

The magnetic excitation spectrum of the magnetocaloric compound MnFe4Si3 has been investigated by means of polarized and unpolarized inelastic neutron scattering on single crystals. Spectra were collected in the ferromagnetic phase (TC≈305K), as well as in the paramagnetic state, in order to underst...

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Bibliographic Details
Published in:Physical review. B 2017-09, Vol.96 (10)
Main Authors: Biniskos, N, Raymond, S, Schmalzl, K, Schneidewind, A, Voigt, J, Georgii, R, Hering, P, Persson, J, Friese, K, Brückel, T
Format: Article
Language:English
Subjects:
Anisotropy
Excitation spectra
Ferromagnetic phases
Ferromagnetism
Inelastic scattering
Magnetism
Neutron scattering
Neutrons
Short range order
Single crystals
Spin dynamics
Variation
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Summary:The magnetic excitation spectrum of the magnetocaloric compound MnFe4Si3 has been investigated by means of polarized and unpolarized inelastic neutron scattering on single crystals. Spectra were collected in the ferromagnetic phase (TC≈305K), as well as in the paramagnetic state, in order to understand the nature of the magnetism in MnFe4Si3. Spin-wave measurements at 1.5 K reveal a strong anisotropy of the magnetic exchange interactions along the (h00) and (00l) reciprocal directions of the hexagonal system, which also manifests itself in the q-dependent linewidths in the paramagnetic state. The correlation lengths indicate a short-range order, while the average linewidth is of the order of kBTC pointing to a behavior typical of many ferromagnets. In addition, the in- and out-of-plane spin fluctuations are found to be isotropic around TC and can be suppressed by a magnetic field of 2 T.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.104407