What is it about?

The orbital angular momentum (OAM) of magnons, associated with their spiral phase wavefronts, holds significant potential for applications in spintronics, orbitronics, and communications. However, generating magnons with specific OAM remains a considerable challenge, especially in the nanoscale. This work proposes a mechanism for generating and encoding magnonic OAM by utilizing antiferromagnetic skyrmions with multiple topological charges. Furthermore, we expand the theoretical model describing the dynamics of magnetic topological structures at finite temperature.

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Why is it important?

This work reveals the potential for novel application leveraging the phase degree of freedom of topological magnetic structures. We propose that skyrmions with multiple topological charges and nanosize can be used to generate magnons with programmable OAM in a layered frustrated antiferromagnetic film. This general mechanism is applicable to various layered materials with inversion symmetry, facilitating the practical application of magnonic OAM. Moreover, we reveal novel skyrmion dynamics in frustrated antiferromagnets, deepening the mechanistic understanding of dynamics of topological magnetic structures.

Perspectives

I hope this work gains widespread attention, as it establishes a viable platform for generating THz magnons with tailored OAM in layered meterials, advancing the orbital-encoded magnonic devices in spintronics, orbitronics and communications.

Shuhua Guan
Tsinghua University

This work not only elucidates unique skyrmion dynamics in frustrated antiferromagnets, but also offers a solution for generating OAM-carrying magnons, which is significant for spintronics.

Xiaolong Zou
Tsinghua University

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This page is a summary of: Skyrmions with multiple topological charges as orbital angular momentum encoders, Proceedings of the National Academy of Sciences, November 2025, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2513454122.
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