A Study on the interfacial exchange coupling in the FMR setup on a FI-2DHG junction

Abstract

In this project, we study spin pumping using ferromagnetic irradiation in a junction of ferromagnetic insulator and a 2D hole gas of a p-AlGaAs/GaAs semiconductor heterostructure. We use microwave radiation to precess the spin in the ferromagnetic insulator layer. In a 2-dimensional hole gas, the Rashba SOC and Dresselhaus SOC interactions coexist and play crucial roles in our spin pumping system by delivering two spin species electrons, spin-up and spin-down, which in turn interact with the spins from the ferromagnetic layer. We then calculate the interfacial exchange coupling by using second-order perturbation theory, which helps us deduce an increment in the spectral width of the Gilbert damping factor. We show the increment in Gilbert damping to the spin orientations in the ferromagnetic insulator, induced through their interactions with the spin species from the 2D Hole Gas.