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Ferromagnetism in transparent thin films of MgO

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Martínez-Boubeta, C. and Beltrán Finez, Juan Ignacio and Balcells, Ll. and Konstantinović, Z. and Valencia, S. and Schmitz, D. and Arbiol, J. and Estrade, S. and Cornil, J. and Martínez, B. (2010) Ferromagnetism in transparent thin films of MgO. Physical review B, 82 (2). ISSN 1098-0121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.82.024405


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http://journals.aps.org/Publisher


Abstract

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.


Item Type:Article
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© 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

Uncontrolled Keywords:V-center; Centers; Surface; Semiconductors; Stability; Vacancies; Defects; Oxide; TiO2.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:31383
Deposited On:27 Jul 2015 09:28
Last Modified:10 Dec 2018 14:58

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