We investigate the strong correlation between magnon–magnon coupling (M–M coupling) and coherent spin pumping in yttrium iron garnet/permalloy (Y3Fe5O12, YIG/Py) heterostructure through spin-torque ferromagnetic resonance technique. We demonstrate experimentally that the spin pumping of hybrid modes is the strongest near the coupling region at 295 K, indicating that coherent spin pumping is closely associated with magnon hybridization. Meanwhile, the coupling strength gc increases from 0.26 to 0.37 GHz with temperature reduction from 295 to 260 K, which is attributed to the enhancement of spin pumping, especially the hybrid mode characterized by spin pumping out of Py that provides a pronounced contribution. Furthermore, the increased linewidth of the hybrid mode near the coupling region at low temperatures leads to enhanced spin mixing conductivity. This enhancement, in turn, improves spin pumping. Our experiments discuss the underlying mechanisms that influence coupling strength in detail, providing deeper insights into tuning M–M coupling.

中文翻译：

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自旋泵浦对 YIG/Py 异质结构中磁振子-磁振子耦合的贡献


我们通过自旋转矩铁磁共振技术研究了钇铁石榴石/坡莫合金 （Y3Fe5O12， YIG/Py） 异质结构中磁振子-磁振子耦合 （M-M 耦合） 和相干自旋泵浦之间的强相关性。我们通过实验证明，在 295 K 时，混合模式的自旋泵浦在耦合区附近最强，表明相干自旋泵浦与磁振子杂交密切相关。同时，随着温度从 295 K 降低到 260 K，耦合强度 gc 从 0.26 GHz 增加到 0.37 GHz，这归因于自旋泵浦的增强，尤其是以 Py 自旋泵出为特征的混合模式提供了显着的贡献。此外，在低温下耦合区附近混合模式的线宽增加导致自旋混合电导率增强。反过来，这种增强功能改进了自旋泵送。我们的实验详细讨论了影响耦合强度的潜在机制，为调整 M-M 耦合提供了更深入的见解。