| 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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Frandsen, Cathrine
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2022Order and Disorder in Layered Double Hydroxides: Lessons Learned from the Green Rust Sulfate-Nikischerite Seriescitations
- 2018Dipolar-coupled moment correlations in clusters of magnetic nanoparticlescitations
- 2017Induced Mesocrystal-Formation, Hydrothermal Growth and Magnetic Properties of α-Fe2O3 Nanoparticles in Salt-Rich Aqueous Solutionscitations
- 2017Off-axis spin orientation in goethite nanoparticlescitations
- 2017Effect of carbon on interstitial ordering and magnetic properties of ε-Fe2(N,C)1-zcitations
- 2017Spin orientation in solid solution hematite-ilmenitecitations
- 2017Effect of carbon on interstitial ordering and magnetic properties of ε-Fe2(N,C) 1-zcitations
- 2016Composition-dependent variation of magnetic properties and interstitial ordering in homogeneous expanded austenitecitations
- 2016Composition-dependent variation of magnetic properties and interstitial ordering in homogeneous expanded austenitecitations
- 2015In Situ Studies of Fe4+ Stability in β-Li3Fe2(PO4)3 Cathodes for Li Ion Batteriescitations
- 2015Reversible guest binding in a non-porous FeII coordination polymer host toggles spin crossovercitations
- 2015Polarized neutron powder diffraction studies of antiferromagnetic order in bulk and nanoparticle NiOcitations
- 2015Reversible guest binding in a non-porous Fe II coordination polymer host toggles spin crossovercitations
- 2012Direction-specific interactions control crystal growth by oriented attachment.citations
- 2012Electron small polarons and their mobility in iron (oxyhydr)oxide nanoparticles.citations
- 2011Spin reorientation in α-Fe2O3 nanoparticles induced by interparticle exchange interactions in alpha-Fe2O3/NiO nanocompositescitations
- 2009Band-gap measurements of bulk and nanoscale hematite by soft x-ray spectroscopycitations
- 2004Interparticle interactions in composites of nanoparticles of ferrimagnetic (gamma-Fe2O3) and antiferromagnetic (CoO,NiO) materialscitations
- 2003Inter-particle Interactions in Composites of Antiferromagnetic Nanoparticles
Places of action
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article
Off-axis spin orientation in goethite nanoparticles
Abstract
Neutron diffraction is a powerful technique for determining the magnetic structure of antiferromagnetic materials. However, for some of these, determining the detailed magnetic structure remains a challenge. In goethite (α-FeOOH) the antiferromagnetic unit cell coincides with the chemical unit cell and, consequently, nuclear and magnetic diffraction peaks occur at the same positions. Analysis of diffraction data from goethite is further complicated by finite-size peak broadening, resulting from goethite commonly occurring in nanocrystalline form. For these reasons, determining the magnetic structure of goethite has been challenging, and few detailed studies have been published. Even today, not all aspects of the magnetic structure are well established. Here, we investigate the magnetic structure of three samples of goethite nanoparticles with polarized neutron powder diffraction (xyz-polarization analysis). Two samples consist of acicular goethite particles that are approximately 40 nm long and with different thicknesses, and one sample consists of pseudo-spherical particles with a diameter of approximately 5 nm. The larger particles consist of several crystallites whereas the 5-nm particles are mostly single crystalline. The polarization analysis enables us to separate magnetic scattering from nuclear and spin-incoherent scattering, resulting in data that can readily be analyzed. For the two samples with the larger particle size, we find nuclear correlation lengths in the [100] direction that are approximately 3 nm longer than the magnetic correlation lengths, indicating a magnetically disordered layer perpendicular to the antiferromagnetic modulation direction. We find no evidence of a magnetically disordered surface layer in the 5-nm particles. We find the magnetic structure to be antiferromagnetic but, in contrast to most previous studies, we find the spin orientation in all three samples to make an angle of 28-30° with respect to the crystallographic b axis.