  We use density functional theory calculations to show that the LaAlO3|SrTiO3
interface between insulating perovskite oxides is borderline in satisfying the
Stoner criterion for itinerant ferromagnetism and explore other oxide
combinations with a view to satisfying it more amply. The larger lattice
parameter of an LaScO3|BaTiO3 interface is found to be less favorable than the
greater interface distortion of LaAlO3|CaTiO3. Compared to LaAlO3|SrTiO3, the
latter is predicted to exhibit robust magnetism with a larger saturation moment
and a higher Curie temperature. Our results provide support for a "two phase"
picture of coexistent superconductivity and ferromagnetism.
