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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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Christensen, Mogens
Aarhus University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (53/53 displayed)
- 2024Aligned Permanent Magnet Made in Seconds–An In Situ Diffraction Studycitations
- 2024The Chemistry of Spinel Ferrite Nanoparticle Nucleation, Crystallization, and Growthcitations
- 2024Aligned Permanent Magnet Made in Seconds:An In Situ Diffraction Studycitations
- 2024High-performance hexaferrite magnets tailored through alignment of shape-controlled nanocompositescitations
- 2023High-Performance Hexaferrite Ceramic Magnets Made from Nanoplatelets of Ferrihydrite by High-Temperature Calcination for Permanent Magnet Applicationscitations
- 2023Sintering in seconds, elucidated by millisecond in situ diffractioncitations
- 2023Defect-Engineering by Solvent Mediated Mild Oxidation as a Tool to Induce Exchange Bias in Metal Doped Ferritescitations
- 2022In-depth investigations of size and occupancies in cobalt ferrite nanoparticles by joint Rietveld refinements of X-ray and neutron powder diffraction datacitations
- 2022Exploiting different morphologies of non-ferromagnetic interacting precursor’s for preparation of hexaferrite magnetscitations
- 2022Combined characterization approaches to investigate magnetostructural effects in exchange-spring ferrite nanocomposite magnetscitations
- 2021‘Need for Speed’: Sub-second in situ diffraction to unravel rapid sintering & texture evolution in ferrite magnets
- 2021‘Need for Speed’: Sub-second in situ diffraction to unravel rapid sintering & texture evolution in ferrite magnets
- 2021Uncorrelated magnetic domains in decoupled SrFe 12 O 19 /Co hard/soft bilayerscitations
- 2021Synthesis and Characterization of a Magnetic Ceramic Using an Easily Accessible Scale Setupcitations
- 2020Restructuring Metal–Organic Frameworks to Nanoscale Bismuth Electrocatalysts for Highly Active and Selective CO 2 Reduction to Formatecitations
- 2020Exploring the direct synthesis of exchange-spring nanocomposites by reduction of CoFe 2 O 4 spinel nanoparticles using in situ neutron diffractioncitations
- 2020Expanding the tunability and applicability of exchange-coupled/decoupled magnetic nanocompositescitations
- 2020Expanding the tunability and applicability of exchange-coupled/decoupled magnetic nanocompositescitations
- 2020Exploring the direct synthesis of exchange-spring nanocomposites by reduction of CoFe2O4 spinel nanoparticles using in situ neutron diffractioncitations
- 2020Restructuring Metal–Organic Frameworks to Nanoscale Bismuth Electrocatalysts for Highly Active and Selective CO<sub>2</sub> Reduction to Formatecitations
- 2020Restructuring Metal–Organic Frameworks to Nanoscale Bismuth Electrocatalysts for Highly Active and Selective $CO_{2}$ Reduction to Formatecitations
- 2020Correlation between microstructure, cation distribution and magnetism in Ni 1-: X Zn x Fe 2 O 4 nanocrystallitescitations
- 2019Novel fast heating furnaces for in situ powder neutron diffraction
- 2019Structure and magnetic properties of W-type hexaferritescitations
- 2019Magnetostructural effects in exchange-spring nanocomposite magnets probed by combined X-ray & neutron scattering
- 2019Novel in situ powder neutron diffraction setups – The creation of a modern magnetic compound
- 2019Air-heated solid–gas reaction setup for in situ neutron powder diffractioncitations
- 2019In Situ In-House Powder X-ray Diffraction Study of Zero-Valent Copper Formation in Supercritical Methanolcitations
- 2019In Situ In-House Powder X-ray Diffraction Study of Zero-Valent Copper Formation in Supercritical Methanolcitations
- 2019Laboratory setup for rapid in situ powder X-ray diffraction elucidating Ni particle formation in supercritical methanolcitations
- 2018Crystalline and magnetic structure-property relationship in spinel ferrite nanoparticlescitations
- 2018Nanoengineered High-Performance Hexaferrite Magnets by Morphology-Induced Alignment of Tailored Nanoplateletscitations
- 2018X-ray and neutron diffraction magnetostructural investigations on exchange-coupled nanocomposite magnets
- 2018Koercivitetsforbedring af strontium hexaferrit nano-krystallitter gennem morfologikontrolleret udglødning. ; Coercivity enhancement of strontium hexaferrite nano-crystallites through morphology controlled annealingcitations
- 2018Structural evolution and stability of Sc 2 (WO 4 ) 3 after discharge in a sodium-based electrochemical cellcitations
- 2018Approaching Ferrite-Based Exchange-Coupled Nanocomposites as Permanent Magnetscitations
- 2018Coercivity enhancement of strontium hexaferrite nano-crystallites through morphology controlled annealingcitations
- 2017Optimization of spring exchange coupled ferrites, studied by in situ neutron diffraction.
- 2016Continuous Flow Supercritical Water Synthesis and Temperature-Dependent Defect Structure Analysis of YAG and YbAG Nanoparticlescitations
- 2016Energy Product Enhancement in Imperfectly Exchange-Coupled Nanocomposite Magnetscitations
- 2016Towards atomistic understanding of polymorphism in the solvothermal synthesis of ZrO 2 nanoparticlescitations
- 2016Towards atomistic understanding of polymorphism in the solvothermal synthesis of ZrO2 nanoparticlescitations
- 2014Coupling in situ synchrotron radiation with ex situ spectroscopy characterizations to study the formation of Ba1−xSrxTiO3 nanoparticles in supercritical fluidscitations
- 2014Characterization of the interface between an Fe–Cr alloy and the p-type thermoelectric oxide Ca3Co4O9citations
- 2014Metal distribution and disorder in the crystal structure of [NH2Et2][Cr7MF8(tBuCO2)16] wheel molecules for M = Mn, Fe, Co, Ni, Cu, Zn and Cdcitations
- 2014Evolution of atomic structure during nanoparticle formationcitations
- 2014Characterization of the interface between an Fe–Cr alloy and the p -type thermoelectric oxide Ca 3 Co 4 O 9citations
- 2013In-situ synchrotron PXRD study of spinel LiMn2O4 nanocrystal formation
- 2013IN-SITU SYNCHROTRON PXRD STUDY OF SPINEL TYPE LiMn2O4 NANOCRYSTAL FORMATION
- 2013Pressure versus temperature effects on intramolecular electron transfer in mixed-valence complexescitations
- 2012Investigation of the correlation between stoichiometry and thermoelectric properties in a PtSb2 single crystalcitations
- 2012Low Cost High Performance Zinc Antimonide Thin Films for Thermoelectric Applicationscitations
- 2005Nanostructured Co1-xNix(Sb1-yTey)3 skutterudites: theoretical modeling, synthesis and thermoelectric propertiescitations
Places of action
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document
Magnetostructural effects in exchange-spring nanocomposite magnets probed by combined X-ray & neutron scattering
Abstract
<p class="MsoNoSpacing" style="text-align:justify">An ideal permanent magnet should be highly resistant to demagnetization (high coercivity <i>H</i><sub>C</sub>) and have a high value of maximum internal magnetization (high saturation magnetization <i>M</i><sub>S</sub>). In the real world, a single-phase magnet might not simultaneously possess high values of these magnetic properties. It is usually observed that rare-earth-free permanent magnets have either high <i>H</i><sub>C</sub>with low <i>M</i><sub>S</sub> (‘hard’ magnet– hard to demagnetize) or, low <i>H</i><sub>C</sub>with high <i>M</i><sub>S</sub> (‘soft’ magnet). The hexaferrite compound SrFe<sub>12</sub>O<sub>19</sub> has relatively high <i>H</i><sub>C</sub> (due to pronounced magnetocrystalline anisotropy) – making it a ‘hard magnetic’ phase, but a higher <i>M</i><sub>S</sub> value would be highly appreciated.<sup>[1]</sup> Spinel ferrites (AB<sub>2</sub>O<sub>4</sub>type) on the other hand, are ‘soft magnetic’ phases <i>i.e. </i>low <i>H</i><sub>C</sub>, but potentially strongly magnetic. Enhancement of <i>H</i><sub>C</sub> and <i>M</i><sub>S</sub>values simultaneously could be achieved by the mixing of two different nanomagnetic phases (hard-soft composite) – known as an exchange-spring nanocomposite.<sup>[2,3]</sup> The resultant magnetic properties of such composites would be hierarchically emergent – arising from the underlying atomic structure, via the nanoscale morphology of the individual particles, to the microscopic structural coupling of the different phases. While various studies have focused on the synthesis of exchange-spring magnets and their magnetic characterizations, detailed structural investigations are limited.<sup>[3–5]</sup> We report a comparative investigation on exchange-spring nanocomposites of SrFe<sub>12</sub>O<sub>19</sub>(SFO – hard magnet) and Zn<sub>0.2</sub>Co<sub>0.8</sub>Fe<sub>2</sub>O<sub>4</sub>(ZCFO – soft magnet) prepared by two different synthesis routes: mechanical powder mixing and sol-gel coating. <i>M</i>-<i>H</i> loops from VSM magnetometry showed a dependence of the exchange-coupling behavior on the technique used for nanocomposite formation. Crystallographic and magnetic structure of the samples were analyzed by combined Rietveld refinement of data from synchrotron X-ray diffraction (SR-XRD performed at MS X04SA beamline @ SLS) & thermal neutron powder diffraction (NPD performed using HRPT diffractometer at SINQ spallation source @ PSI). The difference in the scattering interaction for X-rays and neutrons allowed for complementary, robust & accurate structural analysis.<sup>[5,6]</sup> Combined Rietveldrefinement of SR-XRD and NPD data of the nanocomposites enabled extraction of accurate values for lattice parameters, atomic positions, thermal motion, cation distribution, magnetic moments and microstructure. A detailed understanding of these correlated magnetostructural properties would be instrumental towards improving the performance of permanent magnets based on exchange-spring nanocomposites.</p><p class="MsoNoSpacing" style="text-align:justify"><br/></p><p class="MsoNoSpacing" style="text-align:justify">References:</p><p class="MsoNormal" style="margin-left:32.0pt;text-indent:-32.0pt;mso-pagination:none;mso-layout-grid-align:none;text-autospace:none">[1] R. C. Pullar, <i>Prog.</i><i>Mater.Sci.</i> <b>2012</b>,<i>57</i>, 1191.</p><p class="MsoNormal" style="margin-left:32.0pt;text-indent:-32.0pt;mso-pagination:none;mso-layout-grid-align:none;text-autospace:none">[2] E.F. Kneller, R. Hawig, <i>IEEE Trans. Magn.</i> <b>1991</b>, <i>27</i>, 3588.</p><p class="MsoNormal" style="margin-left:32.0pt;text-indent:-32.0pt;mso-pagination:none;mso-layout-grid-align:none;text-autospace:none">[3] F. Liu, Y.Hou, S. Gao, <i>Chem. Soc. Rev.</i> <b>2014</b>, <i>43</i>, 8098.</p><p class="MsoNormal" style="margin-left:32.0pt;text-indent:-32.0pt;mso-pagination:none;mso-layout-grid-align:none;text-autospace:none">[4] S. Hirosawa, <i>J.Magn. Soc. Japan</i> <b>2015</b>, <i>39</i>, 85.</p><p class="MsoNormal" style="margin-left:32.0pt;text-indent:-32.0pt;mso-pagination:none;mso-layout-grid-align:none;text-autospace:none">[5] S. M. Yusuf,A. Kumar, <i>Appl. Phys. Rev.</i> <b>2017</b>, <i>4</i>, 031303.</p><p class="MsoNormal" style="margin-left:32.0pt;text-indent:-32.0pt;mso-pagination:none;mso-layout-grid-align:none;text-autospace:none">[6] E. Solano, C.Frontera, T. Puig, X. Obradors, S. Ricart, J. Ros, <i>J. Appl. Crystallogr.</i><b>2014</b>, <i>47</i>, 414.</p>