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  • Letter

Acoustic frequency multiplication and pure second-harmonic generation of phonons by magnetic transducers

Chengyuan Cai1,*, Xi-Han Zhou1,*, Weichao Yu2,3, and Tao Yu1,†

  • 1School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
  • 2State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
  • 3Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai 201210, China

  • *These authors contributed equally to this work.
  • †taoyuphy@hust.edu.cn
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Phys. Rev. B 107, L100410 – Published 13 March, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L100410

Abstract

We predict frequency multiplication of surface acoustic waves in dielectric substrates via the ferromagnetic resonance of adjacent magnetic transducers when driven by microwaves. We find pure second-harmonic generation (SHG) without any linear and third-harmonic components by a magnetic nanowire. The SHG and linear phonon pumping are switched by varying the saturated magnetization direction of the wire, or resolved directionally when pumped by a magnetic nanodisk. We address the high efficiency of SHG with comparable magnitude to that of the linear response, as well as a unique nonreciprocal phonon transport that is remarkably distinct in different phonon harmonics. Such an acoustic frequency comb driven by microwaves should bring exceptional tunability for miniaturized phononic and spintronic devices.

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Phys. Rev. B 107, L100410– Published 13 March, 2023
  • Received 7 December 2022
  • Revised 15 February 2023
  • Accepted 2 March 2023
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