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Topological-chiral magnetic interactions driven by emergent orbital magnetism
S Grytsiuk1, J-P Hanke2, M Hoffmann2
1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425, Jülich, Germany. s.grytsiuk@fz-juelich.de.
Nature Communications
|January 26, 2020
Summary
Scientists have translated Ampère's electric loop interactions to the quantum realm, revealing novel topological-chiral magnetic interactions. This discovery paves the way for new chiral magnetic materials with complex 3D magnetization textures.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
- Materials Science
Background:
- Ampère's discovery established the interaction of electric currents via magnetic fields.
- Understanding quantum-level magnetic interactions is crucial for developing advanced materials.
Purpose of the Study:
- To explore the quantum realm analogue of Ampère's observations.
- To identify and characterize new magnetic interactions in spin systems.
- To investigate the potential for novel chiral magnetic materials.
Main Methods:
- Investigated interactions between triangular plaquettes of spins on a lattice.
- Associated atomic-scale electrical currents with electron orbital motion in response to non-coplanar spins.
- Analyzed the resulting topological orbital moments and their interactions.
Main Results:
- Demonstrated a quantum transfer of Ampère's observation to spin systems.
- Identified "topological-chiral interactions" arising from topological orbital moments.
- Showed these interactions can dominate over the Dzyaloshinskii-Moriya interaction.
Conclusions:
- Established a new class of magnetic interactions: topological-chiral interactions.
- Opened pathways for designing chiral magnetic materials with 3D magnetization textures like hopfions.
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