Study of magnetization dynamics in magnetic insulators for magnonic applications

Electronics devices are based on semiconductors transistors, and their improvement is mostly due to reducing its size, which is reaching its limit. To overcome this problem magnonics have appeared as an alternative solution for electronics, with advantages such as lower energy cost, faster information exchange and lower heating due to the absence of Joule effect. Magnetic insulators, more specifically Y₃Fe₅O₁₂ (YIG), appear as a promising material for this application because it has low Gilbert damping and low coercivity, among other properties. In this work, YIG thin films were reproducibly grown on Gd₃Ga₅O₁₂ with 111 oriented substrates by magnetron sputtering furthermore an ex situ annealing with oxygen flow was performed. A systematic study of the magnetic dynamics using ferromagnetic resonance was carried out to optimize the growth conditions of YIG, seeking the lowest value of Gilbert damping aiming towards magnonic applications. After the optimization, non-magnetic metallic materials (bismuth-doped copper, which produces a giant spin Hall effect and Pt) were deposited on YIG to evaluate the applicability for the spin current generated by spin pumping and spin Hall effect via inverse spin Hall effect.