Controlling the magnetization at the conical apex of a multi-terminal STM probe

The goal of the thesis was to control this magnetization at the conical apex of the SF-STM tips. Spin-Filter Scanning tunnel microscopy is a new principle to characterize the magnetization of a sample. First measurements show an out-of-plane magnetization at the conical apex of the tips, where we would like to have an in-plane magnetization. Small tips of silicon were made to mimic the SF-STM tips. These tips have a similar apex as the double tips. At these tips a metal layer stack contains 10 nm gold, 2 to 10 nm cobalt and 5 nm gold were evaporated. First measurements at these tips by magnetic force microscopy confirmed the out-of-plane magnetization at the conical apex of the tips. To be able to control the magnetization anisotropy has been introduced to get an in-plane easy-axis for the magnetization at the conical apex. This is done by introducing evaporation anisotropy and shape anisotropy. Both methods have been characterized separately, before they were combined at one tip.