Freeman Charlie W F, Youel Harry, Budniak Adam K, Xue Zekun, De Libero Henry, Thomson Thomas, Bosman Michel, Eda Goki, Kurebayashi Hidekazu, Cubukcu Murat
London Centre for Nanotechnology, University College London, London WC1H 0AH, U.K.
National Physical Laboratory, Teddington TW11 0LW, U.K.
ACS Nano. 2025 Apr 29;19(16):16024-16031. doi: 10.1021/acsnano.5c02576. Epub 2025 Apr 17.
Antiferromagnetic (AFM) magnons in van der Waals (vdW) materials offer substantial potential for applications in magnonics and spintronics. In this study, we demonstrate ultrastrong magnon-magnon coupling in the GHz regime within a vdW AFM, achieving a maximum coupling rate of 0.91. Our investigation shows the tunability of coupling strength through temperature-dependent magnetic anisotropies. We compare coupling strength values derived from the gap size from the measured spectrum with those calculated directly through the coupling parameter and show that the gap size as a measure of coupling strength is limited for the ultrastrong coupling regime. Additionally, analytical calculations show the possibility to reach the deep-strong coupling regime by engineering the magnetic anisotropy. These findings highlight the potential of vdW AFMs as a model case to study magnetization dynamics in low-symmetry magnetic materials.
范德华（vdW）材料中的反铁磁（AFM）磁振子在磁子学和自旋电子学应用中具有巨大潜力。在本研究中，我们展示了在vdW反铁磁体中GHz频率范围内的超强磁振子 - 磁振子耦合，实现了0.91的最大耦合率。我们的研究表明，通过与温度相关的磁各向异性可以调节耦合强度。我们将从测量光谱的能隙大小得出的耦合强度值与直接通过耦合参数计算得出的耦合强度值进行比较，结果表明，在超强耦合 regime 中，用能隙大小作为耦合强度的度量是有限的。此外，分析计算表明，通过设计磁各向异性有可能达到深强耦合 regime。这些发现突出了vdW反铁磁体作为研究低对称磁性材料中磁化动力学的模型案例的潜力。
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