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  • Letter

Robust formation of nanoscale magnetic skyrmions in easy-plane anisotropy thin film multilayers with low damping

Luis Flacke1,2,*, Valentin Ahrens3, Simon Mendisch3, Lukas Körber4,5, Tobias Böttcher6, Elisabeth Meidinger1,2, Misbah Yaqoob1,2,6, Manuel Müller1,2, Lukas Liensberger1,2 et al.

Attila Kákay4, Markus Becherer3, Philipp Pirro6, Matthias Althammer1,2, Stephan Geprägs1, Hans Huebl1,2,7, Rudolf Gross1,2,7, and Mathias Weiler1,2,6,†

  • 1Walther-Meißner Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
  • 2Physics Department, Technical University of Munich, 85748 Garching, Germany
  • 3Department of Electrical and Computer Engineering, Technical University of Munich, 80333 Munich, Germany
  • 4Helmholtz-Zentrum Dresden - Rossendorf, Institute of Ion Beam Physics and Materials Research, 01328 Dresden, Germany
  • 5Fakultät Physik, Technische Universität Dresden, 01062 Dresden, Germany
  • 6Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
  • 7Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany

  • *luis.flacke@wmi.badw.de
  • †weiler@physik.uni-kl.de
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Phys. Rev. B 104, L100417 – Published 27 September, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L100417

Abstract

We experimentally demonstrate the formation of room-temperature skyrmions with radii of about 25 nm in easy-plane anisotropy multilayers with an interfacial Dzyaloshinskii-Moriya interaction (DMI). We detect the formation of individual magnetic skyrmions by magnetic force microscopy and find that the skyrmions are stable in out-of-plane fields up to about 200 mT. We determine the interlayer exchange coupling as well as the strength of the interfacial DMI. Additionally, we investigate the dynamic microwave spin excitations by broadband magnetic resonance spectroscopy. From the uniform Kittel mode we determine the magnetic anisotropy and low damping αG<0.04. We also find clear magnetic resonance signatures in the nonuniform (skyrmion) state. Our findings demonstrate that skyrmions in easy-plane multilayers are promising for spin-dynamical applications.

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Phys. Rev. B 104, L100417– Published 27 September, 2021
  • Received 23 February 2021
  • Revised 26 May 2021
  • Accepted 2 September 2021
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