TY  - JOUR
AU  - Biniskos, N.
AU  - Raymond, S.
AU  - Schmalzl, K.
AU  - Schneidewind, A.
AU  - Voigt, J.
AU  - Georgii, R.
AU  - Hering, P.
AU  - Persson, J.
AU  - Friese, K.
AU  - Brückel, T.
TI  - Spin dynamics of the magnetocaloric compound MnFe$_{4}$ Si$_{3}$
JO  - Physical review / B
VL  - 96
IS  - 10
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2017-06419
SP  - 104407
PY  - 2017
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000409429300005
DO  - DOI:10.1103/PhysRevB.96.104407
UR  - https://juser.fz-juelich.de/record/837531
ER  -