  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 hybridised 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.
