Improving the surface structure of high quality Sr2FeMoO6 thin films for multilayer structures

Two sets of Sr2FeMoO6 thin films were prepared with pulsed laser deposition and the effect of the laserfluence and the deposition temperature was investigated. The Sr2FeMoO6 thin films showed clear evi-dence of impurity phases when the laser fluence was altered. Phase pure films resulted through thewhole temperature range between 900 ◦C and 1050 ◦C when a proper laser fluence was used. Films fabri-cated at lower deposition temperatures resulted with smaller surface roughnesses around 5 nm, higherCurie temperatures and with relatively high saturation magnetization values. The Curie temperaturewas determined from the minimum of the first order derivative and results showed the highest values of350 K and above. The films with the highest Curie temperature reached zero magnetization above 400 K.The results indicate that both high microstructural and high magnetic quality Sr2FeMoO6 thin films canbe obtained with a deposition temperature between 900 ◦C and 950 ◦C. This provides better fabricationparameters for the upcoming SFMO multilayer structures.