Static and dynamic properties of texturized thick films

Abstract

The fundamental magnetic excitations, spin waves, are capable of transporting energy and an gular momentum without the movement of electric charge, implying the absence of heat energy losses. Besides, the wavelengths of the spin waves are much shorter than the electromagnetic waves at the same frequency, which brings new perspectives to the miniaturization of magnonic devices. Thus, the study of the dynamic of the spin in nanostructured magnetic materials is a topic with great relevance in the area of nanomagnetism. In this thesis, a systematic study is realized to study the physics properties of a magnetic thick film that presents variations of its magnetic properties along the thickness. Due to such variations, a texturized ground state is considered, where the spin-wave modes, evaluated at zero wave vector, are calculated. Both the static and dynamic prop erties are calculated by using the Landau-Lifshitz equation of motion, which is solved in the linear approximation. Thus, the frequencies and the dynamic magnetization components are obtained utilizing an eigenvalue problem