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Strontium hexaferrite platelets: a comprehensive soft X-ray absorption and Mössbauer spectroscopy study

AuthorsSoria, Guiomar D.; Jenus, P.; Marco, J.F. ; Mandziak, Anna; Sánchez-Arenillas, M.; Moutinho, Fernando; Prieto, J. E. ; Prieto, P.; Cerdá, Jorge I. ; Tejera-Centeno, César ; Gallego, Silvia ; Foerster, M.; Aballe, L.; Valvidares, M.; Vasili, H.B.; Pereiro, E.; Quesada, Adrián ; de la Figuera, Juan ; AMPHIBIAN Project ID:720853
KeywordsStrontium hexaferrite
Mössbauer spectroscopy
X-ray absorption
Issue Date2019
PublisherSpringer Nature
CitationScientific Reports 9 (2019)
AbstractPlatelets of strontium hexaferrite (SrFeO, SFO), up to several micrometers in width, and tens of nanometers thick have been synthesized by a hydrothermal method. They have been studied by a combination of structural and magnetic techniques, with emphasis on Mössbauer spectroscopy and X-ray absorption based-measurements including spectroscopy and microscopy on the iron-L edges and the oxygen-K edge, allowing us to establish the differences and similarities between our synthesized nanostructures and commercial powders. The Mössbauer spectra reveal a greater contribution of iron tetrahedral sites in platelets in comparison to pure bulk material. For reference, high-resolution absorption and dichroic spectra have also been measured both from the platelets and from pure bulk material. The O-K edge has been reproduced by density functional theory calculations. Out-of-plane domains were observed with 180° domain walls less than 20 nm width, in good agreement with micromagnetic simulations.
Publisher version (URL)http://dx.doi.org/10.1038/s41598-019-48010-w
Identifiersdoi: 10.1038/s41598-019-48010-w
e-issn: 2045-2322
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