Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.52: Poster

Tuesday, March 13, 2018, 09:30–13:00, Poster A

Non-local magnetoresistance in normal metal|yttrium iron garnet heterostructures — •Birte Cöster, Matthias Althammer, Tobias Wimmer, Stephan Geprägs, Hans Huebl, and Rudolf Gross — Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany

Pure spin currents, i.e. the flow of angular momentum without an accompanying charge current, represent a new paradigm in state-of-the-art spintronics. In conventional electrical conductors pure spin currents are transported via mobile charge carriers. In contrast, in a magnetically ordered insulator pure spin currents are based on the flow of quantized excitations of the spin structure. Normal metal (NM)/ferromagnetic insulator (FMI) heterostructures allow to study pure spin current transport by utilizing the direct and inverse spin Hall effect in the normal metal.

In our experiments, we investigate NM/FMI heterostructures using YIG as FMI. For the NM layer we use different materials, which are deposited via UHV sputtering technique. We employ nanolithography to pattern NM stripe structures on the LPE-YIG thin films grown on GGG substrates. In the non-local magnetotransport experiments, we apply a charge current through one strip while measuring the resulting electrical potential difference of an adjacent strip. We discuss the results obtained for different NM materials and deposition conditions. Moreover, the comparison of the different materials allows us to extract the relevant pure spin current transport properties.
Financial support via NIM is gratefully acknowledged.