Center for Functional Nanomaterials Seminar

Magneto-optical effects refer to the phenomena that magnetic properties of materials are modified by an applied photoexcitation, or the optoelectronic properties are tuned by external magnetic field. They can be utilized as effective experimental tools to analyze spin-dependent processes in novel materials such as 2D materials based heterostructures, and organic inorganic hybrid perovskites. This seminar will present experimental studies on spin-dependent process in novel materials systems for improved performance, by using magnetic field effects and polarized photoexcitation.

1) In designing self-assembled γ-Fe2O3 nanoparticle-graphene van der Waals heterostructures, the dynamic magnetization of sample is studied by using magnetic field effect of light scattering. The demonstration of photoexcitation enhanced magnetization in this heterostructures suggesting an interaction between d-electrons in γ-Fe2O3 and π-electrons in graphene. 2) In high-quality hybrid perovskite/ferromagnetic Co heterostructure with well-defined interface, an optically induced static magnetization was observed in 7.5 nm of MAPbBr3 layer in the vicinity of ferromagnetic Co under a circularly polarized photoexcitation, which is in favor of perovskite spintronic applications. 3) magneto-photocurrent of GUA doped FAPbBr3 perovskite devices are studied to explore the optimized doping concentration for improved light-emitting efficiency.