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<p>Identifying nonlinear interactions among magnons is crucial for advancing the field of magnonics and developing next-generation spintronic devices. In this work, we report the experimental observation of nonlinear magnon mode hopping and hysteretic behavior in a synthetic antiferromagnet (SAF). Under strong radio-frequency excitation, the magnon system exhibits abrupt transitions between acoustic and optic modes, accompanied by GHz-scale frequency jumps—orders of magnitude larger than previously reported in magnon-based hybrid systems. We further show that this mode hopping is hysteretic, reflecting multistable nonlinear dynamics, and support these findings through theory and micromagnetic simulations. These results establish a new regime of nonlinear magnon dynamics, going beyond previously reported strong-coupling effects, and highlight the potential of SAFs as platforms for magnon-based frequency converters and switches for information processing.</p>

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Mode hopping via nonlinear magnon-magnon coupling in a synthetic antiferromagnet

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月12日

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  • Mujin You,
  • Moojune Song,
  • Jun Seok Seo,
  • Donghyeon Lee,
  • Seungha Yoon,
  • Daiju Hayashi,
  • Yoichi Shiota,
  • Teruo Ono,
  • Sanghoon Kim,
  • Se Kwon Kim,
  • Albert Min Gyu Park,
  • Kab-Jin Kim

摘要

Identifying nonlinear interactions among magnons is crucial for advancing the field of magnonics and developing next-generation spintronic devices. In this work, we report the experimental observation of nonlinear magnon mode hopping and hysteretic behavior in a synthetic antiferromagnet (SAF). Under strong radio-frequency excitation, the magnon system exhibits abrupt transitions between acoustic and optic modes, accompanied by GHz-scale frequency jumps—orders of magnitude larger than previously reported in magnon-based hybrid systems. We further show that this mode hopping is hysteretic, reflecting multistable nonlinear dynamics, and support these findings through theory and micromagnetic simulations. These results establish a new regime of nonlinear magnon dynamics, going beyond previously reported strong-coupling effects, and highlight the potential of SAFs as platforms for magnon-based frequency converters and switches for information processing.