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.

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• Observation of the Magnon Hall Effect
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• Magnetoelectric MnPS3 thiophosphate as a new candidate for ferrotoroidicity
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• Magnetism and spin dynamics of an S=3/2 frustrated trillium lattice antiferromagnet K2CrTi(PO4)3
• Itinerant A-type Antiferromagnetic Order in Co${}_{0.25}$TaSe${}_2$
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• Emergent Phenomena with Broken Parity-Time Symmetry: Odd-order vs. Even-order Effects
• Frustration and chirality in three-dimensional trillium lattices: Insights and Perspectives
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• Structural and magnetic properties of CoTeMoO${}_6$ revisited
• Quantized Toroidal Waves on Ferrotoroidal Magnets
• Chirality Transfer to the Magnetic Sublattice in the Hybrid Perovskite (R)-/(S)-3-Fluoropyrrolidinium Copper(II) Chloride