Chirality-driven orbital magnetic moments as a new probe for topological magnetic structures

Abstract

When electrons are driven through unconventional magnetic structures, such as skyrmions, they experience emergent electromagnetic fields that originate several Hall effects. Independently, ground state emergent magnetic fields can also lead to orbital magnetism, even without the spin-orbit interaction. The close parallel between the geometric theories of the Hall effects and of the orbital magnetization raises the question: does a skyrmion display topological orbital magnetism? Here we first address the smallest systems with nonvanishing emergent magnetic field, trimers, characterizing the orbital magnetic properties from first-principles. Armed with this understanding, we study the orbital magnetism of skyrmions, and demonstrate that the contribution driven by the emergent magnetic field is topological. This means that the topological contribution to the orbital moment does not change under continous deformations of the magnetic structure. Furthermore, we use it to propose a new experimental protocol for the identification of topological magnetic structures, by soft x-ray spectroscopy.

arXiv comment17 pages, 5 figures, to be published in Nature Communications

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• Theory of Current-Induced Angular Momentum Transfer Dynamics in Spin-Orbit Coupled Systems
• Topological-chiral magnetic interactions driven by emergent orbital magnetism
• Systematic derivation of realistic spin-models for beyond-Heisenberg solids
• The chiral biquadratic pair interaction
• Discovery of magnetic single- and triple-Q states in Mn/Re(0001)
• Prototypical topological orbital ferromagnet $\gamma$-FeMn
• Probing the topology of the quantum analog of a classical skyrmion
• Magnetoelectric effect and orbital magnetization in skyrmion crystals: Detection and characterization of skyrmions
• Engineering Chiral and Topological Orbital Magnetism of Domain Walls and Skyrmions
• First-principles Dzyaloshinskii-Moriya interaction in a non-collinear framework
• Distinct magnetotransport and orbital fingerprints of chiral bobbers
• Transverse Transport in Two-Dimensional Relativistic Systems with Non-Trivial Spin Textures
• Imprinting and driving electronic orbital magnetism using magnons
• Multiple-scattering approach for multi-spin chiral magnetic interactions: Application to the one- and two-dimensional Rashba electron gas
• Spin-orbit enabled all-electrical readout of chiral spin-textures
• Complex magnetism of B20-MnGe: from spin-spirals, hedgehogs to monopoles
• Topological orbital Hall effect caused by skyrmions and antiferromagnetic skyrmions
• Determination of spin chirality using x-ray magnetic circular dichroism
• Impurity-induced orbital magnetization in a Rashba electron gas
• A spin model for intrinsic antiferromagnetic skyrmions on a triangular lattice
• Antiferromagnetic order of topological orbital moments in atomic-scale skyrmion lattices
• Chirality-induced linear response properties in non-coplanar Mn${}_3$Ge
• Nonlocal orbital magnetism of 3d adatoms deposited on the Pt(111) surface
• Unoccupied surface and interface states in Pd thin films deposited on Fe/Ir(111) surface
• High-resolution combined tunneling electron charge and spin transport theory of Néel and Bloch skyrmions
• Insights into the orbital magnetism of noncollinear magnetic systems
• Orbital Magnetization under an Electric Field and Orbital Magnetoelectric Polarizabilty for a Bilayer Chern System
• Topologically-driven three-spin chiral exchange interactions treated from first principles
• Mixed topology ring states for Hall effect and orbital magnetism in skyrmions of Weyl semimetals
• Three-dimensional topological orbital Hall effect caused by magnetic hopfions
• Universality of defect-skyrmion interaction profiles
• Generalization of the Landau-Lifshitz-Gilbert equation by multi-body contributions to Gilbert damping for non-collinear magnets