Promoting the magnetic exchanges in PLD deposited strained films of FeV2O4 thin films

Transition metal complex oxides are remarkable for the richness of tunable physical properties their strongly correlated electrons allow. We have undertaken the pulsed laser deposition of epitaxial thin films of the magnetically frustrated FeV2O4 spinel vanadate compound. A precise optimization of t...

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Bibliographic Details
Published in:Materials chemistry and physics 2022-01, Vol.276, p.125360, Article 125360
Main Authors: Roulland, F., Roseau, G., Corredor, A. Pena, Wendling, L., Krieger, G., Lefevre, C., Trassin, M., Pourroy, G., Viart, N.
Format: Article
Language:English
Subjects:
Auxetic
Chemical Sciences
Compressive properties
Coordination compounds
Epitaxy
Lattice parameters
Lattice vacancies
Magnetic properties
Magnetic transitions
Material chemistry
Optimization
Physical properties
Pulsed laser deposition
Pulsed lasers
Spinel
Substrates
Thin films
Transition metal compounds
Transition temperature
Vanadates
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Summary:Transition metal complex oxides are remarkable for the richness of tunable physical properties their strongly correlated electrons allow. We have undertaken the pulsed laser deposition of epitaxial thin films of the magnetically frustrated FeV2O4 spinel vanadate compound. A precise optimization of the oxygen pressure deposition conditions was necessary to avoid the presence of volatile over-oxidated vanadium while avoiding the presence of oxygen vacancies. We report the effect of the epitaxial compressive stress induced by the MgO substrates on the structural and magnetic properties of the films. The surprising films lattice parameters reduction in all directions lead to an unusual auxetic behaviour. The reduced volume of the cell results in a decrease of the V–V distances. This allows a 50 K increase of the magnetic transition temperature, which now reaches 160 K. The epitaxial strain tuning of the magnetic order in the iron-based vanadates open new degrees of freedom towards the integration of the films in oxide electronics. •Pure FeV2O4 strained thin films are grown using Pulsed Laser Deposition technique.•Highest FeV2O4 magnetic transition temperature is measured, 45 K above the bulk one.•A never reported auxetic behaviour is observed for FeV2O4 material.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2021.125360