TY  - JOUR
AU  - Stock, C.
AU  - Johnson, R. D.
AU  - Giles-Donovan, N.
AU  - Songvilay, M.
AU  - Rodriguez-Rivera, J. A.
AU  - Lee, N.
AU  - Xu, X.
AU  - Radaelli, P. G.
AU  - Chapon, L. C.
AU  - Bombardi, A.
AU  - Cochran, S.
AU  - Niedermayer, Ch.
AU  - Schneidewind, A.
AU  - Husges, Z.
AU  - Lu, Z.
AU  - Meng, S.
AU  - Cheong, S.-W.
TI  - Spin-wave directional anisotropies in antiferromagnetic Ba 3 NbFe 3 Si 2 O 14
JO  - Physical review / B
VL  - 100
IS  - 13
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2020-01668
SP  - 134429
PY  - 2019
AB  - Ba3NbFe3Si2O14 (langasite) is structurally and magnetically single-domain chiral with the magnetic helicity induced through competing symmetric exchange interactions. Using neutron scattering, we show that the spin waves in antiferromagnetic langasite display directional anisotropy. On applying a time-reversal symmetry breaking magnetic field along the c axis, the spin-wave energies differ when the sign is reversed for either the momentum transfer ±→Q or applied magnetic field ±μ0H. When the field is applied within the crystallographic ab plane, the spin-wave dispersion is directionally isotropic and symmetric in ±μ0H. However, a directional anisotropy is observed in the spin-wave intensity. We discuss this directional anisotropy in the dispersion in langasite in terms of a field-induced precession of the dynamic unit cell staggered magnetization resulting from a broken twofold symmetry. Directional anisotropy, often referred to as nonreciprocal responses, can occur in antiferromagnetic phases in the absence of the Dzyaloshinskii-Moriya interaction or other effects resulting from spin-orbit coupling.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000491464000002
DO  - DOI:10.1103/PhysRevB.100.134429
UR  - https://juser.fz-juelich.de/record/874863
ER  -