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Communication Dans Un Congrès Année : 2019

Microstructural study of nickel thin films by pulsed laser deposition

Résumé

Nickel is a ferromagnetic transition metal with a fcc structure, it has a low electrical resistivity and a good resistance to oxidation. Nickel has recently shown benefits in a wide range of domains, from catalysis to energy storage devices. In particular, nickel magnetization makes it useful in several topical fields such as magnetic resonance imaging or spin-controlled electronic devices. In this context, developing novel and specific nickel thin films are of important interest, especially for nanotechnology. In this work, thin films of nickel achieved on (100)- and (110)-oriented SrTiO3 substrates using a pulsed laser deposition method are presented. The surface morphology and structural properties were investigated by XRD and AFM. Epitaxial growth was highlighted by pole figures. Phi scans and reciprocal space mapping, however, reveal that the films growth on (110)-SrTiO3 have two in-plane and out-of-plane orientations. The unit cell of nickel is rotated in the plane of the film by ±5° and out of the plane by ±3.7°. Surface energy modeling by first principles calculations makes it possible to explain the observed growth by low surface energy anisotropy. In addition, oxidation resistance of the films has been studied by in situ high-temperature XRD. Results show the formation of a NiO oxide layer which retains the initial orientation of the Ni film. Depending on the substrate, the Ni corrosion temperature varies from 375°C to 500°C. Such difference is linked to their density and surface morphology, and results are in agreement with AFM analysis. Furthermore, thin films exhibit a homogeneous and nanostructured surface.

Domaines

Chimie Matériaux
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Dates et versions

hal-02152130 , version 1 (11-06-2019)

Identifiants

  • HAL Id : hal-02152130 , version 1

Citer

Gauthier Lefevre, Sébastien Saitzek, Florent Blanchart, Anthony Ferri, Pascal Roussel, et al.. Microstructural study of nickel thin films by pulsed laser deposition. E-MRS 2019 SPRING MEETING, May 2019, Nice, France. ⟨hal-02152130⟩
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