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

Nair, Akash and Wollstadt, Stephan and Witte, Ralf and Dasgupta, Supratik and Kehne, Philipp and Alff, Lambert and Komissinskiy, Philipp and Clemens, Oliver (2019):
Synthesis and characterisation of fluorinated epitaxial films of BaFeO2F: tailoring magnetic anisotropy via a lowering of tetragonal distortion.
In: RSC Advances, 9 (64), pp. 37136-37143. Royal Society of Chemistry, ISSN 2046-2069,
DOI: 10.25534/tuprints-00009678,
[Article]

Abstract

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.

Item Type: Article
Erschienen: 2019
Creators: Nair, Akash and Wollstadt, Stephan and Witte, Ralf and Dasgupta, Supratik and Kehne, Philipp and Alff, Lambert and Komissinskiy, Philipp and Clemens, Oliver
Origin: Secondary publication via sponsored Golden Open Access
Title: Synthesis and characterisation of fluorinated epitaxial films of BaFeO2F: tailoring magnetic anisotropy via a lowering of tetragonal distortion
Language: English
Abstract:

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.

Journal or Publication Title: RSC Advances
Journal volume: 9
Number: 64
Publisher: Royal Society of Chemistry
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese
Date Deposited: 15 Dec 2019 20:56
DOI: 10.25534/tuprints-00009678
Official URL: https://tuprints.ulb.tu-darmstadt.de/9678
URN: urn:nbn:de:tuda-tuprints-96783
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