Extraordinary magneto-optical Kerr effect via MoS2 monolayer in Au/Py/MoS2 plasmonic cavity

We demonstrate a multilayer magnetoplasmonic structure fabricated from MoS 2 monolayer to significantly increase the magneto-optical Kerr effect (MOKE). The structure is made from glass/Au/Py/MoS 2 × n (where n is the number of MoS 2 monolayers), and the MOKE enhancements are based on the surface plasmon resonance and the extraordinary light absorbing mechanism of the MoS 2 monolayers. The transverse MOKE (TMOKE) is about 18 times larger than that of Au/Py, suggesting the important role of the MoS 2 top layer. Moreover, the calculated Q -factor of the TMOKE signal is found to be about 623, indicating the presence of a sharp cavity resonance that dramatically influences the surface plasmon excitation. Our results convey a new pathway to the design of advanced magneto-optical devices for sensors, recording, etc. We demonstrate a multilayer magnetoplasmonic structure fabricated from MoS 2 monolayer to significantly increase the transverse magneto-optical Kerr effect (TMOKE) with a signal Q -factor more than 600.