Lanthanum-Aluminate (LAO) and Strontium-Titanate (STO) are both nonmagnetic large band gap insulators. However, growing more than a critical number of LAO layers on a TiO2 terminated STO substrate results in interface conduction, super-conductivity and ferromagnetism. In our poster we show how we use scanning SQUID microscopy to probe the interface physics. Our current focus is studying the relation between conductivity, superconductivity and ferromagnetism by simultaneous imaging of their spatial distribution.

This work is done in collaboration with the Moler group at Stanford, Hwang group at Stanford and Mannhart’s group at the Max Planck Institute for Solid State Research