| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Wende, Heiko
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (17/17 displayed)
- 2024Irradiation-induced enhancement of Fe and Al magnetic polarizations in Fe60Al40 films
- 2023Role of kinetic energy on Nb3Sn thin films by low-temperature co-sputtering
- 2023Defying the inverse energy gap law: a vacuum-evaporable Fe(ii) low-spin complex with a long-lived LIESST state
- 2022Comprehensive investigation of crystallographic, spin-electronic and magnetic structure of $(Co_{0.2}Cr_{0.2}Fe_{0.2}Mn_{0.2}Ni_{0.2})_3O_4$ : Unraveling the suppression of configuration entropy in high entropy oxidescitations
- 2022Ferrimagnetic large single domain iron oxide nanoparticles for hyperthermia applicationscitations
- 2022Phosphate bonded CoFe<sub>2</sub>O<sub>4</sub>–BaTiO<sub>3</sub> layered structures: Dielectric relaxations and magnetoelectric couplingcitations
- 2022Comprehensive investigation of crystallographic, spin-electronic and magnetic structure of (Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4: Unraveling the suppression of configuration entropy in high entropy oxides
- 2021A full gap above the Fermi level: the charge density wave of monolayer VS2citations
- 2021Link between structural and optical properties of Co<sub><i>x</i></sub>Fe<sub>3–<i>x</i></sub>O<sub>4</sub> nanoparticles and thin films with different Co/Fe ratioscitations
- 2020Magneto-structural correlations in a systematically disordered B2 latticecitations
- 2020Role of Composition and Size of Cobalt Ferrite Nanocrystals in the Oxygen Evolution Reactioncitations
- 2020Biocompatible magnetic fluids of co-doped iron oxide nanoparticles with tunable magnetic propertiescitations
- 2019Nanoscale Physical and Chemical Structure of Iron Oxide Nanoparticles for Magnetic Particle Imagingcitations
- 2016How the surface affects the electronic and magnetic properties of magnetite nanoparticles
- 2015Magnetoelectric coupling on multiferroic cobalt ferrite–barium titanate ceramic composites with different connectivity schemescitations
- 2013Electric in-plane polarization in multiferroic CoFe2O4/BaTiO3 nanocomposite tuned by magnetic fields
- 2013Manipulation of spin state of iron porphyrin by chemisorption on magnetic substrates
Places of action
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article
Nanoscale Physical and Chemical Structure of Iron Oxide Nanoparticles for Magnetic Particle Imaging
Abstract
<jats:sec><jats:label /><jats:p>In this work, the role of the nanoscale chemical and magnetic structure on relaxation dynamics of iron oxide nanoparticles in the context of magnetic particle imaging (MPI) is investigated with Mössbauer spectroscopy (MS) and electron energy loss spectroscopy (EELS). Two samples of 27 nm monodisperse iron oxide nanoparticles are compared, with and without an additional oxidation optimization step, with corresponding differences in structure and properties. Iron oxide nanoparticles synthesized in the presence of sufficient oxygen form single crystalline, inverse‐spinel magnetite (Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub>) and display magnetic properties suitable for MPI. A secondary wüstite (FeO) phase is observed in the diffraction pattern of unoptimized nanoparticles, which is antiferromagnetic and therefore unsuitable for MPI. Mössbauer spectra confirm the composition of the optimized nanoparticles to be ≈70% magnetite, with the remaining 30% oxidized to maghemite; in contrast, the as‐synthesized particles (without the oxidation step) contained about 40% wüstite and 60% magnetite. The authors use scanning transmission electron microscopy (STEM) with electron energy loss spectroscopy (EELS) to probe iron 2<jats:italic>p</jats:italic>‐3<jats:italic>d</jats:italic> electronic transitions and correlate their intensities with the oxidation state with sub‐nanometer spatial resolution. The optimally oxidized nanoparticles are uniform in crystallography and phase, while the mixed phase nanoparticles are core‐shell wüstite/magnetite. Further confirming the core‐shell structure of the mixed phase nanoparticles, considerable spin canting in the in‐field Mössbauer spectrum, likely caused by interface coupling, is observed.</jats:p></jats:sec>