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<p>Spin-wave nonreciprocity arises from spectral asymmetry such as interfacial DMI or from asymmetric excitation by an antenna’s near field. Using micromagnetic simulations, we show that the latter can be systematically optimized by controlling the in-plane and out-of-plane oscillating fields of a coplanar waveguide. A compact coupling model reveals that nonreciprocity is an interference effect between these components. Guided by this insight, we optimize three common layouts—single strip, signal–ground, and ground–signal–ground—and identify dimensions that maximize nonreciprocity. The optimized devices achieve <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\sim\)</EquationSource> <EquationSource Format="MATHML"><math> <mo>∼</mo> </math></EquationSource> </InlineEquation>30% higher integrated nonreciprocity, establishing a geometry-based route to directional magnon launchers for ferrimagnetic insulators.</p>

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Optimizing spin-wave nonreciprocity via antenna-field design

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Yunyoung Hwang,
  • Taekyeoung An,
  • Kyongmo An

摘要

Spin-wave nonreciprocity arises from spectral asymmetry such as interfacial DMI or from asymmetric excitation by an antenna’s near field. Using micromagnetic simulations, we show that the latter can be systematically optimized by controlling the in-plane and out-of-plane oscillating fields of a coplanar waveguide. A compact coupling model reveals that nonreciprocity is an interference effect between these components. Guided by this insight, we optimize three common layouts—single strip, signal–ground, and ground–signal–ground—and identify dimensions that maximize nonreciprocity. The optimized devices achieve \(\sim\) ∼ 30% higher integrated nonreciprocity, establishing a geometry-based route to directional magnon launchers for ferrimagnetic insulators.