SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Spin Transport and Orbitronics, Spin-Hall Effects (joint session MA/TT)
TT 7.13: Vortrag
Montag, 27. März 2023, 12:30–12:45, HSZ 403
Observation of nonreciprocal magnon Hanle effect — Janine Gückelhorn1,2, Sebastián de-la-Peña3, Matthias Grammer1,2, Monika Scheufele1,2, •Matthias Opel1, Stephan Geprägs1, Juan Carlos Cuevas3, Rudolf Gross1,2,4, Hans Huebl1,2,4, Akashdeep Kamra3, and Matthias Althammer1,2 — 1Walther-Meißner-Institut, BAdW, Garching, Germany — 2Physik-Department, School of Natural Sciences, TUM, Garching, Germany — 3IFIMAC and Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, Spain — 4Munich Center for Quantum Science and Technology, München, Germany
The realization of the magnon Hanle effect, which is based on the precession of magnon pseudospin about the equilibrium pseudofield, via electrically injected and detected spin transport
in an antiferromagnetic insulator demonstrates its high potential for devices and as a convenient probe for the underlying spin interactions in antiferromagnets. Here, we observe a nonreciprocity in the magnon Hanle signal measured in hematite (α-Fe2O3) using two spatially separated platinum electrodes as spin injector/detector [1]. Interchanging their roles was found to alter the detected magnon spin signal. The recorded difference depends on the applied magnetic field and reverses sign when the signal passes its nominal maximum at the so-called compensation field. We explain these observations in terms of a spin transport direction-dependent pseudofield. The latter leads to a nonreciprocity, which is found to be controllable via the applied magnetic field.
[1] J. Gückelhorn et al., arXiv:2209.09040 (2022).