Estudo comparativo das propriedades magnéticas, estrutural e morfológica do semicondutor magnético diluído ZnO dopado com cobalto e sinterizado por microondas e forno elétrico

Abstract

The constant evolution in the areas of engineering and material science has enabled the development of new materials in the field of electronics, where the semiconductor element is paramount for the research and preparation of its components. However, the present silicon-based semiconductor technology has been finding limits on miniaturization and processing power. There is, therefore, the need to optimize space and energy within a device. These limitations can be overcome with the emergence of a new technology: spintronics. One of the proposals of this science is to produce a material that combines semiconductor characteristics with ferromagnetic properties at room temperature, through the doping of a semiconductor matrix by non-zero magnetic moment ions. These are called Diluted Magnetic Semiconductors (SMD). In this sense, the objective of the present work was to dope a Zinc Oxide (ZnO) matrix with the following concentrations: 0.04; 0.08 and 0.15 mol of Co+ 2; sinter them at a temperature of 800 ° C in a conventional oven and at 1000 ° C in a microwave oven; and evaluating the effect of these variables on the structural, morphological and magnetic characteristics of the material, as well as to confirm whether or not a Diluted Magnetic Semiconductor was generated. The X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Vibrating Sample Magnetometry (VSM), Ultraviolet and Visible Spectroscopy were used to obtain the material. UV-VIS) and X-Ray Fluorescence (FRX). By the analysis of the results a material was obtained that maintained the semiconductor properties, integrity of the matrix (without formation of second phase) and change of the magnetic character in relation to the original material.