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arXiv · 2008.00440

Observation of Antiferromagnetic Magnon Pseudospin Dynamics and the Hanle effect

Tobias Wimmer·Akashdeep Kamra·Janine Gückelhorn·Matthias Opel·Stephan Geprägs·Rudolf Gross·Hans Huebl·Matthias Althammer
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Abstract

We report on experiments demonstrating coherent control of magnon spin transport and pseudospin dynamics in a thin film of the antiferromagnetic insulator hematite utilizing two Pt strips for all-electrical magnon injection and detection. The measured magnon spin signal at the detector reveals an oscillation of its polarity as a function of the externally applied magnetic field. We quantitatively explain our experiments in terms of diffusive magnon transport and a coherent precession of the magnon pseudospin caused by the easy-plane anisotropy and the Dzyaloshinskii-Moriya interaction. This experimental observation can be viewed as the magnonic analogue of the electronic Hanle effect and the Datta-Das transistor, unlocking the high potential of antiferromagnetic magnonics towards the realization of rich electronics-inspired phenomena.

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Tobias Wimmer, Akashdeep Kamra, Janine Gückelhorn, Matthias Opel, Stephan Geprägs, Rudolf Gross, Hans Huebl, Matthias Althammer. 2020-08-02. Observation of Antiferromagnetic Magnon Pseudospin Dynamics and the Hanle effect. https://doi.org/10.1103/physrevlett.125.247204

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