SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.62: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Experimental detectability of spin current shot noise — •Luise Siegl1, Michaela Lammel1, Akashdeep Kamra2, Hans Huebl3,4,5, Wolfgang Belzig1, and Sebastian T. B. Goennenwein1 — 1Department of Physics, University of Konstanz — 2Condensed Matter Physics Center (IFIMAC) and Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Spain — 3Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching — 4TUM School of Natural Sciences, Technische Universität München, Garching — 5Munich Center for Quantum Science and Technology (MCQST), München
A spin current crossing a ferromagnet-metal interface is accompanied by spin current shot noise. This shot noise is well understood in spin space. However, its experimental detection requires a conversion to an observable quantity. Consideration of the established conversion from a spin current to a charge current enables a quantitative analysis of the entire process. Here, we analyze the challenges of detecting spin current shot noise from an experimental perspective. In detail, we show that in a typical electrically detected spin pumping experiment, the voltage noise originating from the spin current shot noise is orders of magnitude smaller compared to the contribution of the Johnson-Nyquist noise. We quantify the ratio between spin current shot noise and Johnson-Nyquist noise and find that this ratio does not scale favorably with geometry and only depends on intrinsic material parameters. Our results suggest that the detection of spin current shot noise using the spin Hall effect is experimentally at best very challenging.