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Materials 2018, 11(7), 1204; https://doi.org/10.3390/ma11071204

Anion Doping of Ferromagnetic Thin Films of La0.74Sr0.26MnO3−δ via Topochemical Fluorination

1
Fachgebiet Materialdesign durch Synthese, Institut für Materialwissenschaft, Technische Universität Darmstadt, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
2
Institut für Nanotechnologie, Karlsruher Institut für Technologie, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
3
Electrochemical Energy Storage, Helmholtz Institute Ulm, Helmholtzstraße 11, 89081 Ulm, Germany
4
Karlsruhe Nano Micro Facility, Karlsruher Institut für Technologie, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
*
Author to whom correspondence should be addressed.
Received: 20 June 2018 / Revised: 10 July 2018 / Accepted: 10 July 2018 / Published: 13 July 2018
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

Chemical doping via insertion of ions into the lattice of a host material is a key strategy to flexibly manipulate functionalities of materials. In this work, we present a novel case study on the topotactic insertion of fluoride ions into oxygen-deficient ferromagnetic thin films of La0.74Sr0.26MnO3−δ (LSMO) epitaxially grown onto single-crystal SrTiO3 (STO) substrates. The effect of fluorination on the film structure, composition, and magnetic properties is compared with the case of oxygen-deficient and fully-oxidized LSMO films. Although incorporation of F anions does not significantly alter the volume of the LSMO unit cell, a strong impact on the magnetic characteristics, including a remarkable suppression of Curie temperature and saturation magnetization accompanied by an increase in magnetic coercivity, was found. The change in magnetic properties can be ascribed to the disruption of the ferromagnetic exchange interactions along Mn-anion-Mn chains driven by F doping into the LSMO lattice. Our results indicate that F doping is a powerful means to effectively modify the magnetic functional properties of perovskite manganites. View Full-Text
Keywords: lanthanum strontium manganite; ferromagnetism; fluorination; thin films lanthanum strontium manganite; ferromagnetism; fluorination; thin films
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Anitha Sukkurji, P.; Molinari, A.; Reitz, C.; Witte, R.; Kübel, C.; Chakravadhanula, V.S.K.; Kruk, R.; Clemens, O. Anion Doping of Ferromagnetic Thin Films of La0.74Sr0.26MnO3−δ via Topochemical Fluorination. Materials 2018, 11, 1204.

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