Field-tunable toroidal moment in a chiral-lattice magnet
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. Here we demonstrate that a vortex-like spin configuration with a staggered arrangement of toroidal moments, a ferritoroidal state, is realized in a chiral triangular-lattice magnet BaCoSiO4. 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 in BaCoSiO4.
Keywords
Cite
@article{arxiv.2103.01360,
title = {Field-tunable toroidal moment in a chiral-lattice magnet},
author = {Lei Ding and Xianghan Xu and Harald O. Jeschke and Xiaojian Bai and Erxi Feng and Admasu Solomon Alemayehu and Jaewook Kim and Feiting Huang and Qiang Zhang and Xiaxin Ding and Neil Harrison and Vivien Zapf and Daniel Khomskii and Igor I. Mazin and Sang-Wook Cheong and Huibo Cao},
journal= {arXiv preprint arXiv:2103.01360},
year = {2021}
}