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, P. A. Crowell

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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.

Original languageEnglish (US)
Article numberL060405
JournalPhysical Review B
Issue number6
StatePublished - Aug 1 2022

Bibliographical note

Funding Information:
This work was supported by SMART, a center funded by nCORE, a Semiconductor Research Corporation program sponsored by NIST. Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial support from NSF through the MRSEC program, the Minnesota Nano Center, which is supported by NSF through the National Nano Coordinated Infrastructure Network, Award No. NNCI - 1542202, and the Institute for Rock Magnetism (IRM) at the University of Minnesota, a U.S. National Multi-user Facility supported through the Instrumentation and Facilities program of the National Science Foundation, Earth Sciences Division, under Award No. NSF EAR-1642268 and by funding from the University of Minnesota.

Publisher Copyright:
© 2022 American Physical Society.

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