FERROMAGNETIC RESONANCE STUDY OF MAGNETIC FILMS VIA TRANSMISSION LINE PERTURBATION AND ELECTRICAL METHODS

Abstract

This thesis examines two main methods to characterize the dynamic properties of magnetic thin film systems: transmission line perturbation and electrical methods. Firstly, using the transmission line perturbation method, we studied the magnetization dynamics of NiFe films with stripe domains. Our results highlighted some of the unique features of stripe domains in these films, notably a field-dependent rotatable anisotropy field. Secondly, using the electrical detection of ferromagnetic resonance (FMR) based on spin rectification effect (SRE), we demonstrated that both the dynamic magnetic properties and magneto-transport properties magnetic films can be simultaneously characterized. We also propose a method to accurately separate SRE from inverse spin Hall effect-induced voltages in NiFe/Pt bilayers. Finally, we extend the method for local electrical measurements of spin dynamics with a shorted-coaxial probe, and demonstrate how SRE can be used to separate and quantify both the static and dynamic magnetic dipolar fields due to oscillating spins.