Análise dos mecanismos de relaxação magnética em bicamadas através do efeito de magnetoimpedância

Abstract

The manipulation and transport of electronic spin angular momentum has been used in the development of high performance devices. In this context, the magnetic thin film emerges as a promising candidate for the fabrication of sensor elements, as it presents a stability of magnetic properties, even in increasingly reduced dimensions. Therefore, knowing well the phenomena involved in the dynamics of magnetization of this type of material is an important step for the development of technology and science. Thus, our work was divided into two converging lines of investigation, where the essence of research in these two branches has in common a global objective; to study the mechanisms of magnetic relaxation in samples structured in bilayers using the magnetoimpedance technique. We focused on finding the effective damping parameter of the samples and understanding how each type of magnetic relaxation mechanism contributed to the investigated system via the magnetoimpedance effect. However, this research presented a great challenge, as it brings innovations in the way of investigating the dynamics of magnetization in an insulating material through the magnetoimpedance effect. This technique ensures the broad characterization of magnetization dynamics in ferrimagnetic insulating material, making it possible to analyze the behavior of magnetization with respect to frequency sweep and external magnetic field simultaneously. With the success of this research, we consolidated the implementation of a technique that investigates the dynamics of magnetization in ferromagnetic insulating materials.