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Efficient Modulation of Spin Waves in Two-Dimensional Octagonal Magnonic Crystal.

Samiran Choudhury1, Saswati Barman1,2, YoshiChika Otani3,4

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Summary

This study demonstrates tunable spin wave spectra in quasi-periodic magnonic crystals. Varying lattice constants and magnetic fields precisely controls spin wave propagation for advanced magnonic devices.

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broadband ferromagnetic resonance spectroscopyhigh frequency magnetization dynamicsmagnonic crystalpatterned nanostructuresspin waves

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Magnonic crystals offer tunable spin wave propagation.
  • Quasi-periodic structures introduce unique properties compared to periodic crystals.
  • Controlling spin waves is crucial for developing novel magnonic devices.

Purpose of the Study:

  • To investigate the tunability of magnonic spectra in 2D ferromagnetic antidot lattices with octagonal symmetry.
  • To explore the influence of lattice constants and magnetic field parameters on spin wave dynamics.
  • To understand the anisotropic behavior of spin waves in these quasi-periodic magnonic crystals.

Main Methods:

  • Fabrication of two-dimensional ferromagnetic antidot lattices with varying lattice constants.
  • Broadband ferromagnetic resonance (FMR) spectroscopy to analyze spin wave spectra.
  • Micromagnetic simulations to complement experimental observations and analyze mode profiles.

Main Results:

  • Demonstrated efficient tunability of magnonic spectra by altering lattice constants and magnetic field conditions.
  • Observed a rich variation in spin wave modes, converging from a broad band to two modes as lattice density decreased.
  • Identified significant 8-fold anisotropy in spin wave frequency, with superimposed 4- and 2-fold components, linked to magnetostatic field distribution.

Conclusions:

  • Quasi-periodic magnonic crystals exhibit tunable and anisotropic spin wave propagation.
  • The observed spectral variations and anisotropies are crucial for designing advanced magnonic devices.
  • Experimental and simulation results provide a comprehensive understanding of spin wave behavior in these systems.