• Letter

Anomalous temperature dependence of phonon pumping by ferromagnetic resonance in Co/Pd multilayers with perpendicular anisotropy

W. K. Peria, D.-L. Zhang, Y. Fan, J.-P. Wang, and P. A. Crowell
Phys. Rev. B 106, L060405 – Published 18 August 2022
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Abstract

We demonstrate the pumping of phonons by ferromagnetic resonance in a series of [Co(0.8nm)/Pd(1.5nm)]n multilayers (n=6, 11, 15, and 20) with strong magnon-phonon coupling and perpendicular magnetic anisotropy. The effect is shown using broadband ferromagnetic resonance over a range of temperatures (10–300 K), where a resonant damping enhancement is observed at frequencies where the phonons can form standing waves across the multilayer. The strength of this effect is enhanced by approximately a factor of 4 at 10 K compared to room temperature, which is anomalous in the sense that the temperature dependence of the magnon-phonon coupling predicts an enhancement that is less than a factor of 2. We conclude by explaining how the stronger-than-expected temperature dependence highlights the essential role of dynamic magnetization pinning in driving the phonons.

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  • Received 1 October 2021
  • Revised 19 July 2022
  • Accepted 1 August 2022

DOI:https://doi.org/10.1103/PhysRevB.106.L060405

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

W. K. Peria1,*, D.-L. Zhang2, Y. Fan2, J.-P. Wang2, and P. A. Crowell1

  • 1School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 2Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA

  • *Corresponding author: peria@lanl.gov

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Issue

Vol. 106, Iss. 6 — 1 August 2022

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