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Ferromagnetism in transparent thin films of MgO Martínez-Boubeta, C. Beltrán Fínez, Juan Ignacio Balcells, Ll. Konstantinović, Z. Valencia, S. Schmitz, D. Arbiol, J. Estrade, S. Cornil, J. Martínez, B. © 2010 The American Physical Society. We gratefully acknowledge financial support from the Spanish MICINN Grant No. MAT2009-08024 and Consolider-Ingenio Program Grant No. CSD2007-00041. Z. Konstantinović and C. Martínez-Boubeta are supported through the Ramón y Cajal program. We also thank A. Cebollada and V. Martínez for the careful reading of the manuscript 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. 2023-06-20T03:55:50Z 2023-06-20T03:55:50Z 2010-07-08 journal article 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/ eng MAT2009-08024 CSD2007-00041 open access American Physical Society