Salluzzo, M.Gariglio, S.Stornaiuolo, D.Sessi, V.Rusponi, S.Piamonteze, C.De Luca, G. M.Minola, M.Marré, D.Gadaleta, A.Brune, H.Nolting, F.Brookes, N. B.Ghiringhelli, G.2013-08-272013-08-272013-08-27201310.1103/PhysRevLett.111.087204https://infoscience.epfl.ch/handle/20.500.14299/94306WOS:000323490300010Possible ferromagnetism induced in otherwise nonmagnetic materials has been motivating intense research in complex oxide heterostructures. Here we show that a confined magnetism is realized at the interface between SrTiO3 and two insulating polar oxides, BiMnO3 and LaAlO3. By using polarization dependent x-ray absorption spectroscopy, we find that in both cases the magnetism can be stabilized by a negative exchange interaction between the electrons transferred to the interface and local magnetic moments. These local magnetic moments are associated with magnetic Ti3+ ions at the interface itself for LaAlO3/SrTiO3 and to Mn3+ ions in the overlayer for BiMnO3/SrTiO3. In LaAlO3/SrTiO3 the induced magnetism is quenched by annealing in oxygen, suggesting a decisive role of oxygen vacancies in this phenomenon.text::journal::journal article::research article