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Your search keyword '"Vasili H.B."' showing total 4 results
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4 results on '"Vasili H.B."'

1. Large intrinsic anomalous Hall effect in SrIrO3 induced by magnetic proximity effect

Author

Yoo M.-W., Tornos J., Sander A., Lin L.-F., Mohanta N., Peralta A., Sánchez-Manzano D., Gallego F., Haskel D., Freeland J.W., Keavney D.J., Choi Y., Strempfer J., Wang X., Cabero M., Vasili H.B., Valvidares M., Sánchez-Santolino G., González-Calbet J.M., Rivera A., Leon C., Rosenkranz S., Bibes M., Barthélémy A., Anane A., Dagotto E., Okamoto S., te Velthuis S.G.E., Santamaría J., Villegas J.E., Yoo M.-W., Tornos J., Sander A., Lin L.-F., Mohanta N., Peralta A., Sánchez-Manzano D., Gallego F., Haskel D., Freeland J.W., Keavney D.J., Choi Y., Strempfer J., Wang X., Cabero M., Vasili H.B., Valvidares M., Sánchez-Santolino G., González-Calbet J.M., Rivera A., Leon C., Rosenkranz S., Bibes M., Barthélémy A., Anane A., Dagotto E., Okamoto S., te Velthuis S.G.E., Santamaría J., and Villegas J.E.

Published
2021

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

Author

Delgado Soria, Guiomar, 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, Lucía, Valvidares, M., Vasili, H.B., Pereiro, E., Quesada, Adrián, de la Figuera, Juan, AMPHIBIAN Project ID:720853, UAM. Departamento de Física de Materiales, UAM. Departamento de Química Física Aplicada, and Ministerio de Economía y Competitividad (España)

Subjects
0301 basic medicine, Platelets, Materials science, Science, Analytical chemistry, chemistry.chemical_element, Dichroic glass, Spectral line, X-ray absorption, Article, 03 medical and health sciences, 0302 clinical medicine, Surfaces, interfaces and thin films, Magnetic properties and materials, Microscopy, Mössbauer spectroscopy, SFO, Absorption (electromagnetic radiation), Spectroscopy, Strontium, Multidisciplinary, Física, Química, SrFe12O19, 3. Good health, Strontium hexaferrite (SrFe12O19, SFO), 030104 developmental biology, chemistry, Strontium hexaferrite, Medicine, Density functional theory, 030217 neurology & neurosurgery
Abstract

MECAME / 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/, Strontium 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].

Published
2019

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

Author

Ministerio de Economía y Competitividad (España), Delgado Soria, Guiomar, 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, Michael, Aballe, Lucía, Valvidares, M., Vasili, H.B., Pereiro, E., Quesada, Adrián, de la Figuera, Juan, AMPHIBIAN Project ID:720853, Ministerio de Economía y Competitividad (España), Delgado Soria, Guiomar, 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, Michael, Aballe, Lucía, Valvidares, M., Vasili, H.B., Pereiro, E., Quesada, Adrián, de la Figuera, Juan, and AMPHIBIAN Project ID:720853

Abstract

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.

Published
2019

4. AMPHIBIAN CSIC experimental data SrFe12O19 platelets SciRep2018. AMPHIBIAN CSIC simulated data SrFe12O19 platelets SciRep2018. [Dataset]

Author

European Commission, Delgado Soria, Guiomar, Jenuš, Petra, 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, Lucía, Valvidares, M., Vasili, H.B., Pereiro, E., Quesada, Adrián, de la Figuera, Juan, AMPHIBIAN Project ID:720853, European Commission, Delgado Soria, Guiomar, Jenuš, Petra, 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, Lucía, Valvidares, M., Vasili, H.B., Pereiro, E., Quesada, Adrián, de la Figuera, Juan, and AMPHIBIAN Project ID:720853

Abstract

[EN] 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.

Published
2018

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