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Ferromagnetism in transparent thin films of MgO



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

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

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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.

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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

Palabras clave:V-center; Centers; Surface; Semiconductors; Stability; Vacancies; Defects; Oxide; TiO2.
Materias:Ciencias > Física > Electricidad
Ciencias > Física > Electrónica
Código ID:31383
Depositado:27 Jul 2015 09:28
Última Modificación:04 Aug 2015 10:55

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