Propriedades magnéticas de sistemas de Fe e Ir nanoestruturados

Abstract

Nanomagnetism is an area of strong relevance to science and technology. The possibility of understanding magnetic properties of nanostructured systems can provide a chance to improve features of interest for systems sensitive to magnetism in several fields of technological application. There are a variety of areas for which this topic is relevant, like the computer industry, such as magnetic recording and even biology as the case of magnetotatic bacteria. These comprehensions may allow us to describe and understand, with support from theoretical and experimental physics, complex magnetic structures formed from interaction competition. As the magnetic behavior of systems organized in nanometric dimensions presents huge differences to macroscopic systems (due to boundary conditions, such as number of neighboring atoms and interactions), we will carry out a theoretical study with simulations using Fe and Ir elements in nanostructured arrangements to investigate local properties from the determination of their local density of states (LDOS). In order to do this, we will use the RS-LMTO-ASA (Real Space - Linear Muffin-Tin Orbital) method based on the DFT (Density Functional Theory) to provide an improved description of the structure of the atoms of our interest. We will determine properties such as the magnetic moments of Fe atoms starting from Fe bulk up to adatom and dimer arrangements treated as an impurity causing perturbation on a surface of Ir. As well as the verification of the appearance of a magnetic moment induced in the Ir, that it is a non-magnetic material.