Heteroepitaxial growth of MgO(111) thin films on Al 2O 3(0001): Evidence of a wurtzite to rocksalt transformation

Carlos Martínez-Boubeta, Antía S. Botana, Victor Pardo, Daniel Baldomir, Aldrin Antony, Joan Bertomeu, Josep M. Rebled, Lluís López-Conesa, Sonia Estradé, Francesca Peiró

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We report on a growth study of MgO films deposited on Al 2O 3(0001) substrates by magnetron sputtering. The films exhibited a preferred rocksalt MgO(111) orientation. Surprisingly, depending on the O 2 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. 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.

Original languageEnglish (US)
Article number041407
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number4
DOIs
StatePublished - Jul 19 2012
Externally publishedYes

Fingerprint

Epitaxial growth
wurtzite
Thin films
thin films
Bond length
Substrates
Crystal lattices
Magnetron sputtering
Oxides
engineers
Vacancies
Surface morphology
gas flow
Flow of gases
Heterojunctions
flat surfaces
Electrostatics
magnetron sputtering
electrostatics
Engineers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Heteroepitaxial growth of MgO(111) thin films on Al 2O 3(0001) : Evidence of a wurtzite to rocksalt transformation. / Martínez-Boubeta, Carlos; Botana, Antía S.; Pardo, Victor; Baldomir, Daniel; Antony, Aldrin; Bertomeu, Joan; Rebled, Josep M.; López-Conesa, Lluís; Estradé, Sonia; Peiró, Francesca.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 86, No. 4, 041407, 19.07.2012.

Research output: Contribution to journalArticle

Martínez-Boubeta, C, Botana, AS, Pardo, V, Baldomir, D, Antony, A, Bertomeu, J, Rebled, JM, López-Conesa, L, Estradé, S & Peiró, F 2012, 'Heteroepitaxial growth of MgO(111) thin films on Al 2O 3(0001): Evidence of a wurtzite to rocksalt transformation', Physical Review B - Condensed Matter and Materials Physics, vol. 86, no. 4, 041407. https://doi.org/10.1103/PhysRevB.86.041407
Martínez-Boubeta, Carlos ; Botana, Antía S. ; Pardo, Victor ; Baldomir, Daniel ; Antony, Aldrin ; Bertomeu, Joan ; Rebled, Josep M. ; López-Conesa, Lluís ; Estradé, Sonia ; Peiró, Francesca. / Heteroepitaxial growth of MgO(111) thin films on Al 2O 3(0001) : Evidence of a wurtzite to rocksalt transformation. In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 86, No. 4.
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