Spin pumping in YIG/Pt bilayers as a function of layer thickness

M. Haertinger, C. H. Back, J. Lotze, M. Weiler, S. Geprägs, H. Huebl, S. T. B. Goennenwein, and G. Woltersdorf
Phys. Rev. B 92, 054437 – Published 28 August 2015

Abstract

We systematically investigate the spin-pumping effect in a series of yttrium-iron-garnet (YIG)–platinum (Pt) bilayers, comparing both broadband ferromagnetic resonance and electrically detected spin-pumping experiments. We infer the effective spin-mixing conductance as a function of YIG and Pt layer thickness from ferromagnetic resonance measurements on pure YIG layers as well as on bilayer YIG/Pt samples in a frequency range from 2 to 20 GHz. In bare YIG films, we determine a Gilbert damping constant of approximately α=0.001. With an additional platinum layer on top of the YIG samples, the damping is significantly enhanced. The effective spin-mixing conductance extracted from the ferromagnetic resonance experiments is in agreement with that determined from independent electrically detected spin-pumping experiments.

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  • Received 12 February 2015
  • Revised 23 July 2015

DOI:https://doi.org/10.1103/PhysRevB.92.054437

©2015 American Physical Society

Authors & Affiliations

M. Haertinger and C. H. Back

  • Department of Physics, Universität Regensburg, 93053 Regensburg, Germany

J. Lotze

  • Walter-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany and Physik-Department, Technische Universität München, 85748 Garching, Germany

M. Weiler, S. Geprägs, and H. Huebl

  • Walter-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany

S. T. B. Goennenwein

  • Walter-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany and Nanosystems Initiative Munich (NIM), Schellingstrasse 4, 80799 Munich, Germany

G. Woltersdorf*

  • Department of Physics, Universität Regensburg, 93053 Regensburg, Germany and Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany

  • *georg.woltersdorf@physik.uni-halle.de

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Issue

Vol. 92, Iss. 5 — 1 August 2015

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