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Hybrid magnonic systems host a variety of characteristic quantum phenomenasuch as the magnetically-induced transparency (MIT) and Purcell effect, whichare considered useful for future coherent quantum information processing. Inthis work, we experimentally demonstrate a tunable MIT effect in theY3Fe5O12(YIG)/Permalloy(Py) magnon-magnon coupled system via changing themagnetic field orientations. By probing the magneto-optic effects of Py andYIG, we identify clear features of MIT spectra induced by the modehybridization between the uniform mode of Py and the perpendicular standingspin-wave modes of YIG. By changing the external magnetic field orientations,we observe a tunable coupling strength between the YIG's spin-wave modes andthe Py's uniform mode, upon the application of an out-of-plane magnetic field.This observation is theoretically interpreted by a geometrical consideration ofthe Py and YIG magnetization under the oblique magnetic field even at aconstant interfacial exchange coupling. Our findings show high promise forinvestigating tunable coherent phenomena with hybrid magnonic platforms.

Tunable magnetically induced transparency spectra in magnon-magnon coupled Y3Fe5O12/permalloy bilayers