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arXiv · 1912.13407

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

Yuzan Xiong·Yi Li·Mouhamad Hammami·Rao Bidthanapally·Joseph Sklenar·Xufeng Zhang·Hongwei Qu·Gopalan Srinivasan·John Pearson·Axel Hoffmann·Valentine Novosad·Wei Zhang
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Abstract

We demonstrate the magnetically-induced transparency (MIT) effect in Y$_3$Fe$_5$O$_{12}$(YIG)/Permalloy(Py) coupled bilayers. The measurement is achieved via a heterodyne detection of the coupled magnetization dynamics using a single wavelength that probes the magneto-optical Kerr and Faraday effects of Py and YIG, respectively. Clear features of the MIT effect are evident from the deeply modulated ferromagnetic resonance of Py due to the perpendicular-standing-spin-wave of YIG. We develop a phenomenological model that nicely reproduces the experimental results including the induced amplitude and phase evolution caused by the magnon-magnon coupling. Our work offers a new route towards studying phase-resolved spin dynamics and hybrid magnonic systems.

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Yuzan Xiong, Yi Li, Mouhamad Hammami, Rao Bidthanapally, Joseph Sklenar, Xufeng Zhang, Hongwei Qu, Gopalan Srinivasan, John Pearson, Axel Hoffmann, Valentine Novosad, Wei Zhang. 2019-12-31. Probing magnon-magnon coupling in exchange coupled Y$_3$Fe$_5$O$_{12}$/Permalloy bilayers with magneto-optical effects. https://arxiv.org/abs/1912.13407

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