# Topological-chiral magnetic interactions driven by emergent orbital magnetism

## TL;DR

This paper introduces a novel class of topological chiral magnetic interactions driven by emergent orbital magnetism, revealing new pathways for designing three-dimensional magnetic textures like hopfions.

## Contribution

It demonstrates how topological orbital moments induce chiral interactions that can surpass Dzyaloshinskii-Moriya interactions in magnetic materials.

## Key findings

- Topological orbital moments relate to spin structure topology.
- Emergent interactions can dominate over Dzyaloshinskii-Moriya interactions.
- Potential for creating new chiral magnetic textures like hopfions.

## Abstract

Two hundred years ago, Andr\'e-Marie Amp\`ere discovered that electric loops in which currents of electrons are generated by a penetrating magnetic field can interact with each other. Here we show that Amp\`ere's observation can be transferred to the quantum realm of interactions between triangular plaquettes of spins on a lattice, where the electrical currents at the atomic scale are associated with a peculiar type of the orbital motion of electrons in response to the non-coplanarity of neighbouring spins playing the role of a magnetic field. The resulting topological orbital moment underlies the relation of the orbital dynamics with the topology of the spin structure. We demonstrate that the interactions of the topological orbital moments with each other and with the spins of the underlying lattice give rise to a new class of magnetic interactions $-$ topological chiral interactions $-$ which can dominate over the celebrated Dzyaloshinskii-Moriya interaction, thus opening a path for the realization of new classes of chiral magnetic materials with three-dimensional magnetization textures such as magnetic hopfions.