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Origin of Interface Magnetism in BiMnO3/SrTiO3 and LaAlO3/SrTiO3 Heterostructures

Salluzzo, M.
Sessi, V.
Rusponi, S.
Piamonteze, C.
De Luca, G. M.
Minola, M.
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Published in Physical Review Letters. 2013, vol. 111, no. 8, p. 087204
Abstract Possible 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.
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Research group Groupe Triscone
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SALLUZZO, M. et al. Origin of Interface Magnetism in BiMnO3/SrTiO3 and LaAlO3/SrTiO3 Heterostructures. In: Physical Review Letters, 2013, vol. 111, n° 8, p. 087204. https://archive-ouverte.unige.ch/unige:47227

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Deposited on : 2015-02-24

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