Field-tunable toroidal moment in the chiral-lattice magnet BaCoSiO<sub>4</sub>

ORAL  · Invited

Abstract

A toroidal dipole moment appears independent of the electric and magnetic dipole moment in the multipole expansion of electrodynamics. It arises naturally from vortex-like arrangements of spins. Observing and controlling spontaneous long-range orders of toroidal moments are highly promising for spintronics but remain challenging. In this talk, I will introduce our resent work on a chiral triangular-lattice magnet BaCoSiO4 where a vortex-like spin configuration with a staggered arrangement of toroidal moments, a ferritoroidal state, is realized. Upon applying a magnetic field, we observe multi-stair toroidal transitions correlating directly with metamagnetic transitions. We establish a first-principles microscopic Hamiltonian that explains both the formation of toroidal states and the metamagnetic toroidal transition as a combined effect of the magnetic frustration and the Dzyaloshinskii-Moriya interactions allowed by the crystallographic chirality. I will also briefly touch on the remarkable dynamical response of this magnet where a strong resonance-like mode coexists with coninuous excitations.

*The work at Oak Ridge National Laboratory (ORNL) was supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, Huibo Cao's Early Career Research Program Award KC0402010, under Contract DE-AC05-00OR22725. This research used resources at the High Flux Isotope Reactor and the Spallation Neutron Source, the DOE Office of Science User Facility operated by ORNL.

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Publication: Ding, L., Xu, X. et al. Field-tunable toroidal moment in a chiral-lattice magnet. Nature Communication 12, 5339 (2021). https://doi.org/10.1038/s41467-021-25657-6

Presenters

  • Xiaojian Bai

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab

Authors

  • Xiaojian Bai

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Lei Ding

    • Oak Ridge National Lab

  • Xianghan Xu

    • Rutgers University

  • Harald O Jeschke

    • Okayama University
    • Okayama Univ

  • Erxi Feng

    • Oak Ridge National Lab

  • Alemayehu S Admasu

    • Rutgers University

  • Jaewook Kim

    • Rutgers University, New Brunswick
    • Rutgers University

  • Fei-Ting Huang

    • Rutgers University, New Brunswick

  • Qiang Zhang

    • Oak Ridge National Lab

  • Xiaxin Ding

    • Idaho National Laboratory
    • Los Alamos National Laboratory

  • Neil Harrison

    • Los Alamos Natl Lab
    • National High Magnetic Field Laboratory, Los Alamos, New Mexico 87545, U.S.A.

  • Vivien Zapf

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory

  • Daniel I Khomskii

    • II. Physikalisches Institut, Universitaet zu Koeln, Zuelpicher str. 77, 50937 Koeln, Germany
    • II. Physikalisches Institut

  • Igor Mazin

    • George Mason University
    • Department of Physics and Astronomy and Quantum Science and Engineering Center, George Mason University, Fairfax, Virginia 22030, USA
    • Quantum Science and Engineering Center, Department of Physics and Astronomy - George Mason University

  • Sang-Wook Cheong

    • Rutgers University, New Brunswick
    • Rutgers University

  • Huibo Cao

    • Oak Ridge National Lab