Synthesis and characterisation of fluorinated epitaxial films of BaFeO2F: tailoring magnetic anisotropy via a lowering of tetragonal distortion

In this article, we report on the synthesis and characterisation of fluorinated epitaxial films of BaFeO2F via low-temperature fluorination of thin films of BaFeO2.5+d grown by pulsed laser deposition. Diffraction measurements show that fluoride incorporation only results in a contraction of the fil...

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Bibliographic Details
Published in:RSC advances 2019-11, Vol.9 (64), p.37136-37143
Main Authors: Nair, Akash, Wollstadt, Stephan, Witte, Ralf, Dasgupta, Supratik, Kehne, Philipp, Lambert Alff, Komissinskiy, Philipp, Clemens, Oliver
Format: Article
Language:English
Subjects:
Antiferromagnetism
Chemistry
Distortion
Film thickness
Fluorination
Fluorine
Low temperature
Magnetic anisotropy
Magnetic moments
Magnetism
Mossbauer spectroscopy
Pulsed laser deposition
Pulsed lasers
Single crystals
Substrates
Synthesis
Thin films
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Summary:In this article, we report on the synthesis and characterisation of fluorinated epitaxial films of BaFeO2F via low-temperature fluorination of thin films of BaFeO2.5+d grown by pulsed laser deposition. Diffraction measurements show that fluoride incorporation only results in a contraction of the film perpendicular to the film surface, where clamping by the substrate is prohibitive for strong in-plane changes. The fluorinated films were found to be homogenous regarding the fluorine content over the whole film thickness, and can be considered as single crystal equivalents to the bulk phase BaFeO2F. Surprisingly, fluorination resulted in the change of the tetragonal distortion to a nearly cubic symmetry, which results in a lowering of anisotropic orientation of the magnetic moments of the antiferromagnetically ordered compound, confirmed by Mössbauer spectroscopy and magnetic studies.
ISSN:2046-2069
DOI:10.1039/c9ra08039b