Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Spin Hall Effects

MA 3.3: Vortrag

Montag, 31. März 2014, 10:00–10:15, HSZ 403

Spin-pumping induced inverse spin Hall effect at Fe/Pt interface: the influence of Pt thickness — •Evangelos Papaioannou, Viktor Lauer, Thomas Brächer, Philipp Pirro, and Burkard Hillebrands — Fachbereich Physik, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern, Germany

The spin-pumping effect allows for the injection of a spin current from a ferromagnetic (FM) layer into an attached non-magnetic metal (NM) layer. [1] This spin current is subsequently transformed into a charge current by the inverse spin Hall effect (ISHE). Here, we examine the role of Pt thickness on the spin-pumping induced inverse spin Hall effect in Fe/Pt bilayers. Pt is grown epitaxially on top of Fe in order to maximize the ISHE efficiency [2]. The morphology of the Fe/Pt interface influences the effective spin mixing conductance. In magnetic field dependent measurements, the presence of a strong magnetic anisotropy gives rise to two distinct inverse spin Hall effect voltage peaks. The Pt thickness dependence on the ISHE-voltage from spin pumping is discussed with respect to proximity effects that can appear at the Fe/Pt interface.

[1] Y. Tserkovnyak, A. Brataas, and G. Bauer, Phys. Rev. Lett. 88, 117601 (2002). [2] E. Th. Papaioannou, P. Fuhrmann, M. B. Jungfleisch, T. Brächer, P. Pirro, V. Lauer, J. Lösch, and B. Hillebrands, Applied Physics Letters 103, 162401 (2013).