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Journal Article

Chiral logic computing with twisted antiferromagnetic magnon modes


Schäffer,  Alexander F.
External Organizations;
International Max Planck Research School for Science and Technology of Nano-Systems, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Jia, C., Chen, M., Schäffer, A. F., & Berakdar, J. (2021). Chiral logic computing with twisted antiferromagnetic magnon modes. npj Computational Materials, 7: 101. doi:10.1038/s41524-021-00570-0.

Cite as: https://hdl.handle.net/21.11116/0000-000A-DC21-9
Antiferromagnetic (AFM) materials offer an exciting platform for ultrafast information handling with low cross-talks and compatibility with existing technology. Particularly interesting for low-energy cost computing is the spin wave-based realization of logic gates, which has been demonstrated experimentally for ferromagnetic waveguides. Here, we predict chiral magnonic eigenmodes with a finite intrinsic, magnonic orbital angular momentum ℓ in AFM waveguides. ℓ is an unbounded integer determined by the spatial topology of the mode. We show how these chiral modes can serve for multiplex AFM magnonic computing by demonstrating the operation of several symmetry- and topology-protected logic gates. A Dzyaloshinskii–Moriya interaction may arise at the waveguide boundaries, allowing coupling to external electric fields and resulting in a Faraday effect. The uncovered aspects highlight the potential of AFM spintronics for swift data communication and handling with high fidelity and at a low-energy cost.