Influência do tratamento térmico nas propriedades estruturais e magnéticas de filmes finos de granada de ítrio e ferro (YIG)

Abstract

The main objective of this work was to study the thermal influence of the of the structural1 and magnetic properties of yttrium iron garnet (YIG; Y3Fe5O12) deposited on gallium garnet and gadolinium garnet (GGG; Gd3Ga5O12). For this purpose, a study with the assemblies of four films. The films were grown by sputtering. followed by heat treatment outside the deposition chamber in a tubular tube furnace. The heat treatment temperatures were varied from 700oC to 850oC. Coercivity measurements were acquired using a vibrating sample magnetometer, are in agreement with the literature, as well as highlighting the extremely soft nature of the samples produced. X-ray diffraction showed that YIG is monocrystalline (111) and that the temperature variation during the heat treatment did not alter the crystalline structure of the films. The ferromagnetic resonance measurements with the fit showed the lowest linewidth value, 8.59 Oe, for the sample exposed at 750oC.