Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Spin currents and spin torques
MA 27.2: Vortrag
Mittwoch, 14. März 2018, 09:45–10:00, EB 407
Magnon spin valve effect in a multilayer insulator spintronics system — •Joel Cramer1,2, Felix Fuhrmann1, Ulrike Ritzmann1,3, Eiji Saitoh4, Ulrich Nowak3, and Mathias Kläui1,2 — 1für Physik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany — 2Graduate School of Excellence Materials Science in Mainz, 55128 Mainz, Germany — 3Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — 4WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Magnon-based spintronic applications are a promising alternative to charge-driven devices regarding information transport and processing [1]. We report on ferromagnetic resonance spin pumping measurements in a magnonic spin valve device consisting of magnetic yttrium iron garnet (YIG)/CoO/Co multilayers. By means of microwaves and external magnetic fields YIG is brought into ferromagnetic resonance, thus emitting a pure spin current through the sample stack. The spin current propagates through the antiferromagnetic CoO and is detected in the Co layer via the inverse spin Hall effect [2]. The CoO furthermore enhances the Co coercive field, such that switching between a parallel or antiparallel alignment of the YIG and Co magnetization at the YIG resonance field is enabled. For parallel and antiparallel alignment we observe a very different amplitude of the detected magnonic spin current signal, resulting in a spin valve effect amplitude of 120% [3]. [1] Chumak et al., Nat. Phys. 11, 453 (2015) [2] Miao et al., Phys. Rev. Lett. 111, 066602 (2013) [3] Cramer et al., arxiv:1706.07592