/Permalloy Bilayers with Tunable Magnon-Magnon Coupling

The magneto-optic probing of hybrid magnonic systems is made possible due to a magnon’s ability to couple with many quasiparticles, including photons and phonons.  Several characteristic quantum phenomena are seen in these hybrid magnonic systems, including the magnetically-induced transparency (MIT) and Purcell effect [1,2]. In this experiment, we magneto-optically detect features of MIT spectra induced by the mode hybridization of Py’s ferromagnetic resonance and YIG’s perpendicular standing spin-wave. Additionally, we demonstrate the possible tuning of this effect through manipulation of an external magnetic field’s orientation and intensity.  Our findings show high promise for investigating tunable coherent phenomena with hybrid magnonic platforms.

 

[1] Y. Xiong et al, "Detecting Phase-Resolved Magnetization Dynamics by Magneto-Optic Effects at 1550 nm Wavelength", IEEE Trans. Magn. 57, 4300807 (2020).

[2] Y. Xiong et al, "Probing magnon–magnon coupling in exchange-coupled YIG/Permalloy bilayers with magneto-optical effects", NPG Sci. Rep. 10, 12548 (2020).