Jamileh Beik Mohammadi
University of Alabama
Investigation of the dynamic response of magnetic thin films: experimental and theoretical approaches
Characterization of the dynamic response of magnetic materials can provide information about magnetic anisotropies and relaxation processes in magnetic multilayers. Using high frequency techniques such as ferromagnetic resonance, one can quantify dynamic properties of these multilayers. Broadband ferromagnetic resonance (FMR) is a powerful tool to investigate magnetic anisotropy such as unidirectional, uniaxial perpendicular, and higher order uniaxial anisotropies. In addition, this technique enables us to study relaxation mechanisms in magnetic multilayers with exchange bias anisotropy and inhomogeneous uniaxial perpendicular anisotropies. In this talk, I will explain our experimental and theoretical (micromagnetic simulations) investigations of magnetic anisotropies and dynamic magnetic properties in multilayered thin films with applications in spintronic devices. In the first part of the talk I will focus on broadband FMR studies of anisotropies and unidirectional relaxation in IrMn/CoFe exchange biased system. In the second part, I will talk about inhomogeneous uniaxial PMA as a source of higher order uniaxial perpendicular anisotropy.