Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.54: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Non-local magnon transport in ferrimagnetic insulators — •Tobias Wimmer1,2, Kathrin Ganzhorn1,2, Stefan Klingler1,2, Nynke Vlietstra1,2, Stephan Gepraegs1, Rudolf Gross1,2,3, Hans Huebl1,2,3, and Sebastian T. B. Goennenwein1,2,3,4 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany — 3Nanosystems Initiative Munich (NIM), Schellingstraße 4, München, Germany — 4Institut für Festkörperphysik, Technische Universität Dresden, Dresden, Germany
Pure spin currents are the key ingredient for information processing in spintronic devices. Recent experiments in ferromagnetic insulator (FMI)/Pt heterostructures show that information can be carried by diffusing thermal magnons in Yttrium-Iron-Garnet (YIG) as well as Gadolinium-Iron-Garnet (GdIG). These non-equilibrium magnons are generated electrically at the FMI|Pt interface using a dc charge current and are detected as a non-local voltage signal in a second electrically isolated Pt strip. Here, we study this so-called magnon-mediated magnetoresistance (MMR) in detail as a function of the injector and detector separation, temperature and magnetic field. Based on our findings, we have implemented a magnonic majority gate consisting of a 4-strip YIG|Pt device. We furthermore present the MMR effect in the compensated ferrimagnet GdIG, offering intriguing insights into the transport behavior of different magnon branches.