Estudo dos mecanismos de ancoragem das paredes de domínio magnético em materiais ferromagnéticos utilizandoo modelo de Jiles - Atherthon

Abstract

The study of the magnetic properties of materials has become increasingly important for the development of new technologies. Part of the growth in the applications of various materials was due to increasing research in the field of magnetism. It is common to use different magnetic materials in many technologies of our daily life, for example, in cell phones, in bank ATMs, modern computers, as well as in generators and electrical transformers. For the various applications, it was necessary a series of researches and studies involving the properties of materials associated with magnetism. The study of the magnetic behavior of materials can be carried out from the application of a magnetic field and its response to that field. Thus, it is possible to classify them as diamagnetic, paramagnetic and ferromagnetic. In ferromagnetic materials, the orientations of the magnetic domains and the movement of the domain walls are the main mechanisms associated with the magnetization process. Based on the Jiles-Atherton Theory and existing experimental results in the scientific literature that deal with the proposed theme, this work presents a study that deals with the pinning mechanisms of the magnetic domain walls during magnetization processes. Results show that the magnetization process of a ferromagnetic material is strongly influenced by the characteristics, distribution and properties of the microstructural defects that act as pinning sites for the magnetic domain walls. Therefore, parameters associated with domain wall pinning sites were analyzed based on existing results in the scientific literature