Spin-Torque Excitation of Perpendicular Standing Spin Waves in Coupled YIG/Co Heterostructures

Stefan Klingler, Vivek Amin, Stephan Geprägs, Kathrin Ganzhorn, Hannes Maier-Flaig, Matthias Althammer, Hans Huebl, Rudolf Gross, Robert D. McMichael, Mark D. Stiles, Sebastian T. B. Goennenwein, and Mathias Weiler
Phys. Rev. Lett. 120, 127201 – Published 23 March 2018
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Abstract

We investigate yttrium iron garnet (YIG)/cobalt (Co) heterostructures using broadband ferromagnetic resonance (FMR). We observe an efficient excitation of perpendicular standing spin waves (PSSWs) in the YIG layer when the resonance frequencies of the YIG PSSWs and the Co FMR line coincide. Avoided crossings of YIG PSSWs and the Co FMR line are found and modeled using mutual spin pumping and exchange torques. The excitation of PSSWs is suppressed by a thin aluminum oxide interlayer but persists with a copper interlayer, in agreement with the proposed model.

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  • Received 7 December 2017
  • Revised 15 February 2018

DOI:https://doi.org/10.1103/PhysRevLett.120.127201

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Stefan Klingler1,2,*, Vivek Amin3,4, Stephan Geprägs1,2, Kathrin Ganzhorn1,2, Hannes Maier-Flaig1,2, Matthias Althammer1,2, Hans Huebl1,2,5, Rudolf Gross1,2,5, Robert D. McMichael3, Mark D. Stiles3, Sebastian T. B. Goennenwein6,7, and Mathias Weiler1,2,†

  • 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
  • 2Physik-Department, Technische Universität München, 85748 Garching, Germany
  • 3Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6202, USA
  • 4Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
  • 5Nanosystems Initiative Munich, 80799 Munich, Germany
  • 6Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden, Germany
  • 7Center for Transport and Devices of Emergent Materials, Technische Universität Dresden, 01062 Dresden, Germany

  • *stefan.klingler@wmi.badw.de
  • mathias.weiler@wmi.badw.de

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Issue

Vol. 120, Iss. 12 — 23 March 2018

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