Strain relaxation and oxygen superstructure modulation in epitaxial Sr4 Fe6 O13±δ films

J. Santiso*, J. A. Pardo, C. Solís, G. Garcia, A. Figueras, M. D. Rossell, G. Van Tendeloo

*Autor corresponent d’aquest treball

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Resum

The compressive strain induced in epitaxial Sr4 Fe6 O13±δ (SFO) films of different thicknesses grown on SrTiO3 substrates is partially released by the modulation of the incommensurate oxygen superstructure along the a -axis parallel to the substrate [q=α am*, superspace group Xmmm (α00) 0s0]. The modulation α value varies proportionally to the in-plane a -parameter in a continuous range from 0.41, for fully strained thin films of about 20-30 nm, to 0.44 for partially-relaxed thicker films of about 280 nm. This mechanism is responsible for the observed slow relaxation of the cell structure upon the film thickness increase in comparison with an equilibrium misfit dislocation-mediated relaxation.

Idioma originalAnglès
Número d’article132105
Pàgines (de-a)1-3
Nombre de pàgines3
RevistaApplied physics letters
Volum86
Número13
DOIs
Estat de la publicacióPublicada - 28 de març 2005

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