Spin-wave directional anisotropies in antiferromagnetic Ba3NbFe3Si2O14

Stock, C.; Johnson, R. D.; Giles-Donovan, N.; Songvilay, M.; Rodriguez-Rivera, J. A.; Lee, N.; Xu, X.; Radaelli, P. G.; Chapon, L. C.; Bombardi, A.; Cochran, S.; Niedermayer, Ch.; Schneidewind, A.; Husges, Z.; Lu, Z.; Meng, S.; Cheong, S.-W.

doi:10.1103/physrevb.100.134429

Spin-wave directional anisotropies in antiferromagnetic Ba₃NbFe₃Si₂O₁₄

Journal Article · Tue Oct 22 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.100.134429· OSTI ID:1800457

Stock, C. ^[1]; Johnson, R. D. ^[2]; Giles-Donovan, N. ^[3]; Songvilay, M. ^[4]; Rodriguez-Rivera, J. A. ^[5]; Lee, N. ^[6]; Xu, X. ^[6]; Radaelli, P. G. ^[2]; Chapon, L. C. ^[7]; Bombardi, A. ^[7]; Cochran, S. ^[3]; Niedermayer, Ch. ^[8]; Schneidewind, A. ^[9]; Husges, Z. ^[10]; Lu, Z. ^[10]; Meng, S. ^[10]; Cheong, S.-W. ^[6]

Univ. of Edinburgh, Scotland (United Kingdom); OSTI
Univ. of Oxford (United Kingdom). Clarendon Lab.
Univ. of Glasgow, Scotland (United Kingdom)
Univ. of Edinburgh, Scotland (United Kingdom)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
Rutgers Univ., Piscataway, NJ (United States)
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Forschungsneutronenquell Heinz Meier-Leibnitz (FRM-II), Garching (Germany); Technische Univ. Dresden (Germany)
Helmholtz-Zentrum Berlin für Materialien und Energie, (Germany)

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 ±$$\vec {Q}$$ 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. Finally, 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.

View Accepted Manuscript (DOE)

Research Organization:: Rutgers Univ., Piscataway, NJ (United States)

Sponsoring Organization:: Carnegie Trust; Engineering and Physical Sciences Research Council (EPSRC); National Institute of Standards and Technology (NIST); National Science Foundation (NSF); Science and Technology Facilities Council (STFC); USDOE Office of Science (SC)

Grant/Contract Number:: FG02-07ER46382

OSTI ID:: 1800457

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 13 Vol. 100; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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