Preparation Of Gd-Fe Multilayers Films & Research About The Coupling Induction In Multilayers

Due to their excellent comprehensive performance, rare earth magnetic functional thin films are highly interested in recent years. And with the further development of thin film preparation technology, rare earth magnetic functional films began to be widely used in many fields such as the recording technology, data storage and processing, scientific research, military and so on. The Gd element has a very unique characteristic in all of the rare earth metals, because Gd has an electron on each of its 7 tracks which makes Gd has the most of lone pair electrons in all REs. The magnetic moment of Gd because of lone pair of electrons is particularly large. And if this characteristic can be used effectively, it will bring great use value. Besides, Gd has a bigger magnetic moment but lower Curie temperature(Tc), and Fe has the opposite. And there is a great application prospect if we can combine the advantages of the two.To get a systematic understanding about dependent of deposition conditions on properties of Gd films, a series of Gd films were prepared under different Ar gas pressure: 0.5, 0.7, 1.0, 1.5Pa; and another series of Gd films were prepared under different substrate temperatures: 25, 100, 200, 350, 500 ℃. The effects of the deposition time, Ar pressure and subst rate temperature on microstructures and crystal orientation were investigated by grazing-incidence X-ray diffraction( XRD), transmission electron microscopy(TEM), scan electron microscopy(SEM), high resolution transmission electron microscope(HRTEM): we found that the optimum growth pressure for Gd films growing on the Ta transition layer is 0.4Pa; the best growth power is 21 W, and interval growth(60s for each sputtering 60s)is good for increasing the crystallinity of FCC and HCP phases; lower Ar pressure and plenty deposition time will contribute to the formation of Gd-hcp phase, and high substrate temperature can diminish the inner stress in Gd films and promote lattice parameters closer to the ideal Gd hcp-structure.At room temperature, the saturation magnetization of the Mmax of bilayers showed increasing trend with the increase of substrate temperature; and at low temperatures(50K), the saturation magnetization of the Mmax of bilayers presented decreasing trend with the increase of substrate temperature. the saturation magnetization of the trilayers(Fe/Gd/Fe)has a tendency to decrease with the increase of the thickness of Gd film.