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00925njm 22002777a 4500 dc Martínez-Boubeta, C. author Beltrán Fínez, Juan Ignacio author Balcells, Ll. author Konstantinović, Z. author Valencia, S. author Schmitz, D. author Arbiol, J. author Estrade, S. author Cornil, J. author Martínez, B. author 2010-07-08 We show both theoretical and experimental evidences of the appearance of ferromagnetism in MgO thin films. First principles calculations allow predicting the possibility of the formation of a local moment in MgO, provided the existence of Mg vacancies which create holes on acceptor levels near the O 2p-dominated valence band. Magnetic measurements evidence of the existence of room-temperature ferromagnetism in MgO thin films. High-resolution transmission electron microscopy demonstrates the existence of cation vacancies in our samples. Finally, by applying the element specificity of the x-ray magnetic circular dichroism technique, we also demonstrate that the magnetic moments of the system arise from the spin polarization of the 2p electrons of oxygen atoms surrounding Mg vacancies. 1098-0121 10.1103/PhysRevB.82.024405 https://hdl.handle.net/20.500.14352/44684 http://dx.doi.org/10.1103/PhysRevB.82.024405 http://journals.aps.org/ Ferromagnetism in transparent thin films of MgO