Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.43: Poster

Tuesday, April 2, 2019, 10:00–13:00, Poster E

Controlling spin transmission in collinear ferroic magnetic multilayer systems — Joel Cramer¹, •Felix Fuhrmann¹, Ulrike Ritzmann¹, Ulrich Nowak², Eiji Saitoh³, and Mathias Kläui¹ — ¹Institute of Physics, Johannes Gutenberg-University Mainz, 55128 Mainz, Germany — ²Department of Physics, University of Konstanz, 78457 Konstanz, Germany — ³WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

In the research field of spintronics, devices can use spin currents rather than charge currents [1]. In particular in insulators, pure spin currents can be employed and we report on spin pumping [2] measurements in collinear magnetic yttrium iron garnet (YIG)/CoO/Co multilayers. By means of microwaves and external magnetic fields, YIG is brought into ferromagnetic resonance, resulting in a pure spin current that propagates through the sample stack and is finally detected in the Co layer via the inverse spin Hall effect [3]. The CoO layer enables the spin current transmission and de-coupling of the ferromagnets and furthermore increases the coercive field of the Co layer by exchange bias. This allows for the switching between a parallel or antiparallel alignment of the YIG and Co magnetization. Depending on the alignment of the YIG and Co magnetization, we observe a strongly different spin transport signal amplitude and thus a magnon spin-valve-like behavior is observed [4]. [1] S.A. Wolf et al., Science 294, 1488 (2001). [2] Y. Tserkovnyak et al., Phys. Rev. Lett. 88,117601 (2002). [3] J. Sinova et al., Rev. Mod. Phys. 87, 1213 (2015). [4] J. Cramer et al., Nature Commun. 9, 1089 (2018).