Propriedades fisicas do monocristal fe/mgo(100) e estudo da expansao termica da superficie da ag(100)

Charlie Salvador Gonçalves

In this work we have developed a way to grow Fe/MgO(100) monocrystals by magnetron sputtering DC. We investigated the growing in a temperature range among 100 oC and 300 oC. Structural and magneto-crystalline properties were studied by dierent experimental techniques. Thickness and surface roughness of the lms were investigated by atomic force microscopy, while magneto-crystalline properties were investigated by magneto-optical Kerr eect and ferromagnetic resonance. Our results show that as we increase the deposition temperature, the magneto-crystalline anisotropy of the lms also increases, following the equation of Avrami. The best temperature value to make a lm is 300 oC. As the main result, we built a base of magnetoresistence devices and as an aplication, we present measurements of Fe/Cr/Fe trilayer coupling. In a second work we investigated the temperature dependence of the rst three interlayer spacings of Ag(100) surface using low energy electron diraction. A linear expansion model of crystal surface was used and the values of Debye temperatures of the rst two layers and thermal expansion coecient were determinated. A relaxation of 1% was found for Ag(100) surface and these results are matched with faces (110) and (111) of the silver. iv

Propriedades fisicas do monocristal fe/mgo(100) e estudo da expansao termica da superficie da ag(100)

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