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In this work, we study magnon-magnon coupling in synthetic antiferromagnets (SyAFs) using microwave spectroscopy at room temperature. Two distinct spin-wave modes are clearly observed and are hybridized at degeneracy points. We provide a phenomenological model that captures the coupling phenomena and experimentally demonstrate that the coupling strength is controlled by the out-of-plane tilt angle as well as the interlayer exchange field. We numerically show that a spin-current mediated damping in SyAFs plays a role in influencing the coupling strength.


Sud, A.;  Zollitsch, C. W.;  Kamimaki, A.;  Dion, T.;  Khan, S.;  Iihama, S.;  Mizukami, S.;  Kurebayashi, H.

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