| 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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Honecker, Dirk
Universidad de Cantabria
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (28/28 displayed)
- 2024Small-angle neutron scattering analysis in Sn-Ag Lead-free solder alloyscitations
- 2022Uniaxial polarization analysis of bulk ferromagnets: theory and first experimental resultscitations
- 2022Magnetic nanoprecipitates and interfacial spin disorder in zero-field-annealed Ni50Mn45In5 Heusler alloys as seen by magnetic small-angle neutron scatteringcitations
- 2022Magnetic nanoprecipitates and interfacial spin disorder in zero-field-annealed Ni<sub>50</sub>Mn<sub>45</sub>In<sub>5</sub> Heusler alloys as seen by magnetic small-angle neutron scatteringcitations
- 2022Controlling the rotation modes of hematite nanospindles using dynamic magnetic fields
- 2021TaC Precipitation Kinetics During Cooling of Co−Re‐Based Alloyscitations
- 2021Clustering in Ferronematics - the Effect of Magnetic Collective Orderingcitations
- 2021Unraveling Nanostructured Spin Textures in Bulk Magnetscitations
- 2020Field Dependence of Magnetic Disorder in Nanoparticlescitations
- 2020Magnetic Guinier lawcitations
- 2020Magnetic structure factor of correlated moments in small-angle neutron scatteringcitations
- 2020The benefits of a Bayesian analysis for the characterization of magnetic nanoparticlescitations
- 2020The benefits of a Bayesian analysis for the characterization of magnetic nanoparticlescitations
- 2020Unraveling Nanostructured Spin Textures in Bulk Magnets
- 2019Field Dependence of Magnetic Disorder in Nanoparticlescitations
- 2019Evidence for the formation of nanoprecipitates with magnetically disordered regions in bulk $mathrm{Ni}_{50}mathrm{Mn}_{45}mathrm{In}_{5}$ Heusler alloys
- 2019Using the singular value decomposition to extract 2D correlation functions from scattering patterns
- 2019Experimental observation of third-order effect in magnetic small-angle neutron scatteringcitations
- 2019The magnetic structure factor of correlated moments in small-angle neutron scatteringcitations
- 2019The magnetic structure factor of correlated nanoparticle moments in small-angle neutron scattering
- 2019Magnetic ordering of the martensite phase in Ni-Co-Mn-Sn-based ferromagnetic shape memory alloyscitations
- 2019Transverse and longitudinal spin-fluctuations in INVAR Fe0.65Ni0.35.citations
- 2018Dipolar-coupled moment correlations in clusters of magnetic nanoparticlescitations
- 2018Dipolar-coupled moment correlations in clusters of magnetic nanoparticlescitations
- 2018Dipolar-coupled moment correlations in clusters of magnetic nanoparticlescitations
- 2016Magnetic small-angle neutron scattering on bulk metallic glasses
- 2013Magnetization reversal in Nd-Fe-B based nanocomposites as seen by magnetic small-angle neutron scatteringcitations
- 2013Analysis of magnetic neutron-scattering data of two-phase ferromagnetscitations
Places of action
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document
Dipolar-coupled moment correlations in clusters of magnetic nanoparticles
Abstract
Here, we investigate the nature of the moment coupling between 10-nm DMSA-coated magnetic nanoparticles, in both colloidal dispersion and in powder form. The individual iron oxide cores were composed of > 95% maghemite and agglomerated to clusters. At room temperature the ensemble behaved as a superparamagnet according to M\"ossbauer and magnetization measurements, however, with clear signs of dipolar interactions at low temperatures. Analysis of temperature-dependent AC susceptibility data in the superparamagnetic regime indicates a tendency for dipolar coupled anticorrelations of the core moments within the clusters. To resolve the directional correlations between the particle moments we performed polarized small-angle neutron scattering and determined the magnetic spin-flip cross-section of the powder in low magnetic field at 300 K. We extract the underlying pair distance distribution function of the magnetization vector field by an indirect Fourier transform of the cross-section, and which suggests positive as well as negative correlations between nearest neighbor moments, with anticorrelations clearly dominating for next-nearest moments. These tendencies are confirmed by Monte Carlo simulations of such core-clusters.