%0 Journal Article
%A Stock, C.
%A Johnson, R. D.
%A Giles-Donovan, N.
%A Songvilay, M.
%A Rodriguez-Rivera, J. A.
%A Lee, N.
%A Xu, X.
%A Radaelli, P. G.
%A Chapon, L. C.
%A Bombardi, A.
%A Cochran, S.
%A Niedermayer, Ch.
%A Schneidewind, A.
%A Husges, Z.
%A Lu, Z.
%A Meng, S.
%A Cheong, S.-W.
%T Spin-wave directional anisotropies in antiferromagnetic Ba 3 NbFe 3 Si 2 O 14
%J Physical review / B
%V 100
%N 13
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M FZJ-2020-01668
%P 134429
%D 2019
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000491464000002
%R 10.1103/PhysRevB.100.134429
%U https://juser.fz-juelich.de/record/874863