Films minces nanocomposites ZnxFe1-xO1+δ : phases wurtzite, sel gemme et spinelle

Abstract : This thesis deals with the growth of thin films of zinc/iron oxides (ZnxFe1-xO1+δ) by pulsed laser deposition (PLD) and the possibility of controlling their structural and physicochemical properties by varying the elaboration conditions: oxygen pressure and growth temperature, respective proportions of zinc/iron. For high values of x (x> 65%), the films are single-phase with a ZnO-type wurtzite structure (Fe:ZnO films), with 80% optical transparency in the UV-visible range but without ferromagnetic properties; depending on their iron (1-x) content, they evolve from very good electrical conductors to near-insulators. For small values of x (x <15%), the films are also single-phase with a Fe3O4-type spinel structure (Zn:Fe3O4 films). They exhibit very good ferromagnetic properties at ambient temperature as well as good electrical conductivity, the localization effects of charge carriers occurring below the Verwey temperature. The number of antiphase walls can be decreased by a two-step growth, as evidenced by magnetoresistance measurements. At intermediate zinc rates (15%
Document type :
Theses
Matériaux. Université Pierre et Marie Curie - Paris VI, 2017. Français. 〈NNT : 2017PA066068〉
Liste complète des métadonnées

https://tel.archives-ouvertes.fr/tel-01609883
Contributor : Abes Star <>
Submitted on : Wednesday, October 4, 2017 - 10:15:06 AM
Last modification on : Tuesday, October 10, 2017 - 1:46:23 PM

File

2017PA066068.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01609883, version 1

Collections

Citation

Christian Hébert. Films minces nanocomposites ZnxFe1-xO1+δ : phases wurtzite, sel gemme et spinelle. Matériaux. Université Pierre et Marie Curie - Paris VI, 2017. Français. 〈NNT : 2017PA066068〉. 〈tel-01609883〉

Share

Metrics

Record views

189

Document downloads

31