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

G. D. Soria, P. Jenus, J. F. Marco, Anna Mandziak, M. Sanchez-Arenillas, F. Moutinho, J. E. Prieto, P. Prieto, J. Cerdá, C. Tejera-Centeno, Soledad Gallego, Michael Foerster, Lucía Aballe, Manuel Valvidares, Hari Babu Vasili, Eva Pereiro, Adrian Quesada, Juan de la Figuera

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Resum

Platelets 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.
Idioma originalAnglès
RevistaScientific Reports
Volum9
DOIs
Estat de la publicacióPublicada - 2019

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