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<p>The ferromagnetic resonance (FMR) behavior of patterned nickel magnonic crystals is shown to be strongly governed by the geometry and thickness of the individual nanostructures. Arrays of square, triangular, and circular nanopillars fabricated by electron beam lithography exhibit a clear inversion in the resonance field order between in-plane (S2 &gt; S1 &gt; S3) and out-of-plane (S2 &lt; S3 &lt; S1) configurations. This inversion arises from the interplay between shape-induced anisotropy and thickness-related dimensional effects. Micromagnetic simulations corroborate the experimental findings, revealing how the dipolar field distribution and edge curvature modulate local magnetization dynamics. The results establish geometry as an efficient tuning parameter for FMR responses in magnonic systems, opening new pathways for the design of spintronic components and high-frequency magnetic devices based on controlled anisotropy engineering.</p>

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The FMR Response of Nickel Magnonic Crystals Modulated by the Individual Element Shape

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • D. M. Oliveira,
  • S. Castro-Lopes,
  • J. E. Abrão,
  • J. F. O. da Silva,
  • A. S. Carvalho,
  • E. L. T. França,
  • E. Padrón-Hernández

摘要

The ferromagnetic resonance (FMR) behavior of patterned nickel magnonic crystals is shown to be strongly governed by the geometry and thickness of the individual nanostructures. Arrays of square, triangular, and circular nanopillars fabricated by electron beam lithography exhibit a clear inversion in the resonance field order between in-plane (S2 > S1 > S3) and out-of-plane (S2 < S3 < S1) configurations. This inversion arises from the interplay between shape-induced anisotropy and thickness-related dimensional effects. Micromagnetic simulations corroborate the experimental findings, revealing how the dipolar field distribution and edge curvature modulate local magnetization dynamics. The results establish geometry as an efficient tuning parameter for FMR responses in magnonic systems, opening new pathways for the design of spintronic components and high-frequency magnetic devices based on controlled anisotropy engineering.