Scanning superconducting quantum interference device microscopy : sensitive mapping of magnetic flux on thin films

Thin films and interfaces can hold interesting phenomena. A scanning superconducting quantum interference device microscope (SSM) can map the magnetic flux of a surface. With a SSM a high magnetic resolution can be achieved. The SSM at the University of Twente has been made opera- tional again. Improving the fabrication processes and making the setup more robust. Three different materials have extensively been tested using this device. The first material is a LaAlO3 /SrTiO3 interface which might have ferromagnetism and superconductivity in a single interface. This was not found in the tested samples. In the second material doped TiO2 a landscape of ferromagnetic dipoles were found. The third material a LaMnO3 (LMO) film. The LMO films are grown on STO and are ferromagnetic insulators. Measuring the LMO films with the SSM revealed ferromagnetic domains.