From the viewpoint of materials, we focus on complex functional oxides. The functions we have in mind are (high-temperature) superconductivity, magnetic and ferroelectric properties as well as electrical (magneto-)conductivity. Characterization methods include dedicated thin film diffractometry, Superconducting QUantum Interference Device (SQUID), magnetoconductivity between 300 mK and 400 K in up to 17 T, and high-resolution electron microscopy. We investigate the fundamental materials properties, the effect of multilayer and hybrid systems, interfaces, and novel thin film matter and their functionality in integrated devices such as a tunneling magneto resitance (TMR) junction or a microwave varactor.