Anisotropic spin-wave excitations in multiferroic BiFeO3

Zhang, Depei; Dissanayake, Sachith; Winn, Barry; Matsuda, Masaaki; Ito, Toshimitsu; Fishman, Randy

doi:10.1103/physrevb.105.144426

Anisotropic spin-wave excitations in multiferroic BiFeO3

Journal Article · Thu Apr 21 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.105.144426· OSTI ID:1864424

Zhang, Depei ^[1]; Dissanayake, Sachith ^[2]; ^[1]; ^[1]; ^[3]; ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Rochester, NY (United States)
National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)

Polarized inelastic neutron-scattering experiments have been performed to elucidate the anisotropic behavior of the low-energy spin-wave excitations in a multiferroic BiFeO₃, which shows a cycloidal spin structure below 640 K. Using neutron polarization analysis for single magnetic domain crystals, magnetic excitation modes in and out of the cycloidal plane below 6 meV were separated successfully. The magnetic excitation spectra were analyzed using linear spin-wave theory. The low-energy magnon density of states consist of several magnon modes, including the two anisotropic modes, Φ and Ψ modes, distributed in and out of the cycloidal plane, respectively, which were previously observed using optical spectroscopies. Furthermore, there are other magnon modes that are not active in optical measurements. Additionally, a model spin Hamiltonian, which reproduces the spin-wave frequencies observed using optical spectroscopies, explains the overall spectra reasonably well.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1864424

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 14 Vol. 105; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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