Magnetism at Amorphous Oxide Interfaces

Recent work has shown that a mobile interfacial electron gas is created when certain amorphous transition metal oxides are grown on strontium titanate. We report torque magnetometry and transport measurements on a series of STO-based oxide heterostructures with amorphous overlayers grown by atomic layer deposition. We observe in-plane ferromagnetic ordering that is qualitatively similar to results observed in crystalline LAO/STO samples. We will discuss the implications of these results on the origin of magnetism in both polar and amorphous oxide interfaces.