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Asymmetric Magnon Frequency Comb.

Xue Liang1,2, Yunshan Cao2, Peng Yan2

  • 1School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China.

Nano Letters
|May 24, 2024
PubMed
Summary
This summary is machine-generated.

We demonstrate asymmetric spin wave transmission using a skyrmion nanocavity. This structure generates a unidirectional magnon frequency comb with over 50 teeth, advancing spintronic device research.

Keywords:
magnetic structuresmagnon frequency combskyrmionspin wavesspintronics

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Nonlinear Dynamics

Background:

  • Spin waves, or magnons, are fundamental to information processing.
  • Skyrmions are topologically protected spin textures with potential applications in data storage and logic.
  • Controlling spin wave propagation and generating magnon-based signals are key challenges in spintronics.

Purpose of the Study:

  • To theoretically investigate asymmetric spin wave transmission in a coupled waveguide-skyrmion system.
  • To explore the generation of magnon frequency combs using skyrmion nanocavities.
  • To establish a universal paradigm for asymmetric magnon frequency comb generation.

Main Methods:

  • Theoretical modeling of spin wave propagation in a waveguide-skyrmion structure.
  • Utilizing the skyrmion as an effective nanocavity for magnons.
  • Employing two-tone excitations and analyzing nonlinear mixing within the skyrmion wall.

Main Results:

  • Demonstrated asymmetric spin wave transmission due to the chiral nature of the skyrmion.
  • Observed a unidirectional magnon frequency comb with a record number of teeth (>50).
  • Showcased the skyrmion's whispering gallery modes for magnons.

Conclusions:

  • The coupled waveguide-skyrmion structure is a universal platform for generating asymmetric magnon frequency combs.
  • The findings enhance understanding of nonlinear magnon-texture interactions.
  • This work opens new avenues for asymmetric spin wave transmission and magnon frequency comb control.