Crescimento de filmes nanométricos monocristalinos de Fe/MgO(100) por "SPUTTERING" DC

AUTOR(ES)

Thatyara Freire de Souza

DATA DE PUBLICAÇÃO

2007

RESUMO

The research behind this master dissertation started with the installation of a DC sputtering system, from its first stage, the adaptation of a refrigerating system, passing by the introduction of a heating system for the chamber using a thermal belt, until the deposition of a series of Fe/MgO(100) single crystal nanometric film samples. The deposition rates of some materials such as Fe, Py and Cu were investigated through an Atomic Force Microscope (AFM). For the single crystal samples, five of them have the same growth parameters and a thickness of 250Å, except for the temperature, which varies from fifty degrees from one to another, from 100C to 300C. Three other samples also have the same deposition parameters and a temperature of 300C, but with thickness of 62,5Å, 150Å, and 250Å. Magneto-optical Kerr Effect (MOKE) of the magnetic curves measurements and Ferromagnetic Resonance (FMR) were made to in order to study the influence of the temperature and thickness on the samples magnetic properties. In the present dissertation we discuss such techniques, and the experimental results are interpreted using phenomenological models, by simulation, and discussed from a physical point of view, taking into account the systems free magnetic energy terms. The results show the growth of the cubic anisotropy field (Hac) as the samples deposition temperature increases, presenting an asymptotic behavior, similar to the characteristic charging curve of a capacitor in a RC circuit. A similar behavior was also observed for the Hac due to the increase in the samples thicknesses. The 250˚A sample, growth at 300C, presented a Hac field close to the Fe bulk value

ASSUNTO(S)

filme nanométrico fisica filme nanométrico

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