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Heteroepitaxial growth of MgO(111) thin films on Al2O3(0001): Evidence of a wurtzite to rocksalt transformation
Martínez Boubeta, José Carlos; Botana, Antía S.; Pardo, Víctor; Baldomir, Daniel; Antony, Aldrin; Bertomeu i Balagueró, Joan; Rebled, J. M. (José Manuel); López-Conesa, Lluís; Estradé Albiol, Sònia; Peiró Martínez, Francisca
Universitat de Barcelona
We report on a growth study of MgO films deposited on Al2O3(0001) substrates by magnetron sputtering. The films exhibited a preferred rocksalt MgO(111) orientation. Surprisingly, depending on the O2 gas flow ratio, a structure of graphiticlike wurtzite MgO(0001) has been revealed. The observed Mg-O perpendicular bond length reduction is accompanied by an atomically flat surface morphology for the development of MgO(111) films; the transition to the bulk rocksalt structure occurs in the 3-6 nm coverage range. Previously, relaxation of the electrostatic instability of MgO(111) films accompanied by an in-plane lattice increase has been suggested theoretically [Phys. Rev. Lett. 98, 205701 (2007)]. Here, relying on ab initio calculations, we infer that Mg vacancies facilitate the lattice match with the substrate. This mechanism suggests methods to engineer oxide heterostructures.
Pel·lícules fines
Òxids metàl·lics
Estructura electrònica
Thin films
Metallic oxides
Electronic structure
(c) American Physical Society, 2012
American Physical Society

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