Design and realization of a torque magnetometer for magnetization studies on LaAlO3-SrTiO3 interfaces

Two-dimensional electron systems (2-DESs) have been found to form at the interface between the otherwise insulating oxides LaAlO3 and SrTiO3. The strongly correlated electron system show metallic and superconducting phases. The magnetic properties of the 2-DESs interface are under debate. We intend to use highly sensitive micromechanical torque magnetometry to measure the magnetization of correlated electron states in the 2-DESs formed at the interface between SrTiO3 and LaAlO3. This will allow us to address different phenomena such as the de Haas-van Alphen effect, dia- and paramagnetism in superconducting states, spontaneous magnetization in case of correlated magnetism as well as magnetic hysteresis and anisotropy. Methods and results of ongoing measurements will be presented.