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

AuthorsDelgado Soria, Guiomar; Jenus, P.; Marcos, 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
Issue Date19-May-2019
Citation5th Mediterranean Conference on the Applications of the Mössbauer Effect / 41st Workshop of the French speaking Group of Mössbauer Spectroscopy
AbstractStrontium ferrite (SFO, SrFe12O19) is a ferrite employed for permanent magnets due to its high magnetocrystalline anisotropy. Since its discovery in the mid-20th century, this hexagonal ferrite has become an increasingly important material both commercially and technologically, finding a variety of uses and applications. Its structure can be considered a sequence of alternating spinel (S) and rocksalt (R) blocks. All the iron cations are in the Fe3+ oxidation state and it has a ferrimagnetic configuration with five different cationic environments for the iron (three octahedral sites, a tetraedrical site and a bipiramidal site)[1,2]. We have studied the properties of SrFe 12O19 in the shape of platelets, up to several micrometers in width, and tens of nanometers thick, synthesized by a hydrothermal method. We have characterized the structural and magnetic properties of these platelets by Mössbauer spectroscopy, x-ray transmission microscopy (TMX), transmission electron microscopy (TEM), x-ray diffraction (XRD), vibrating-sample magnetometry (VSM), x-ray absorption spectroscopy (XAS), x-ray circular magnetic dichroism (XMCD) and photoemission electron microscopy (PEEM). To the best of our knowledge this is the first time that the x-ray absorption spectra at the Fe L 2,3 edges of this material in its pure form have been reported. The Mössbauer results recorded from these platelets both in the electron detection and transmission modes have helped to understand the iron magnetic moments determined by XMCD (Fig.1). The experimental results have been complemented with multiplet calculations aimed at reproducing the observed XAS and XMCD spectra at the Fe L 2,3 absorption edge, and by density functional theory (DFT) calculations to reproduce the oxygen K- absorption edge. Finally the domain pattern measured in remanence is in good agreement with micromagnetic simulations [3].
DescriptionMECAME / GFSM 2019, Montpellier, 19 to 23 may 2019 .-- In honour of Dr Jean-Claude Jumas (Institut Charles Gerhardt, CNRS, University of Montpellier, France). -- https://mecame-gfsm2019.irb.hr/
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