TY  - JOUR
AU  - Xiao, Y.
AU  - Nandi, S.
AU  - Su, Y.
AU  - Fu, Z.
AU  - Faulhaber, E.
AU  - Schneidewind, A.
AU  - Brückel, Th.
AU  - Kumar, Naveen
AU  - Jin, Wentao
TI  - Spin-wave and electromagnon dispersions in multiferroic MnWO 4 as observed by neutron spectroscopy: Isotropic Heisenberg exchange versus anisotropic Dzyaloshinskii-Moriya interaction
JO  - Physical review / B
VL  - 93
IS  - 21
SN  - 2469-9950
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2016-03385
SP  - 214428
PY  - 2016
AB  - High-resolution inelastic neutron scattering reveals that the elementary magnetic excitations in multiferroic MnWO4 consist of low-energy dispersive electromagnons in addition to the well-known spin-wave excitations. The latter can well be modeled by a Heisenberg Hamiltonian with magnetic exchange coupling extending to the 12th nearest neighbor. They exhibit a spin-wave gap of 0.61(1) meV. Two electromagnon branches appear at lower energies of 0.07(1) and 0.45(1) meV at the zone center. They reflect the dynamic magnetoelectric coupling and persist in both the collinear magnetic and paraelectric AF1 phase and the spin spiral ferroelectric AF2 phase. These excitations are associated with the Dzyaloshinskii-Moriya exchange interaction, which is significant due to the rather large spin-orbit coupling.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000378104100004
DO  - DOI:10.1103/PhysRevB.93.214428
UR  - https://juser.fz-juelich.de/record/810796
ER  -