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We demonstrate the magnetically-induced transparency (MIT) effect inY$_3$Fe$_5$O$_{12}$(YIG)/Permalloy(Py) coupled bilayers. The measurement isachieved via a heterodyne detection of the coupled magnetization dynamics usinga single wavelength that probes the magneto-optical Kerr and Faraday effects ofPy and YIG, respectively. Clear features of the MIT effect are evident from thedeeply modulated ferromagnetic resonance of Py due to theperpendicular-standing-spin-wave of YIG. We develop a phenomenological modelthat nicely reproduces the experimental results including the induced amplitudeand phase evolution caused by the magnon-magnon coupling. Our work offers a newroute towards studying phase-resolved spin dynamics and hybrid magnonicsystems.

Probing magnon-magnon coupling in exchange coupled Y$_3$Fe$_5$O$_{12}$/Permalloy bilayers with magneto-optical effects