Mogens Christensen
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View article: Enhancing magnetocrystalline anisotropy in W-type SrFe18O27 hexaferrite via tailored substitutions
Enhancing magnetocrystalline anisotropy in W-type SrFe18O27 hexaferrite via tailored substitutions Open
W-type SrFe18O27 exhibits promising potential as a rare-earth-free “gap” permanent magnet due to its substantial magnetization and high Curie temperature. However, the commercial use of W-type SrFe18O27 hexaferrite is hindered by its limit…
View article: Synthesis, Crystal Structure, Site Occupancy, and Magnetic Properties of Aluminum-Substituted M-Type Sr Hexaferrite SrFe<sub>12-x</sub>Al<sub><i>x</i></sub>O<sub>19</sub> Nanoparticles
Synthesis, Crystal Structure, Site Occupancy, and Magnetic Properties of Aluminum-Substituted M-Type Sr Hexaferrite SrFe<sub>12-x</sub>Al<sub><i>x</i></sub>O<sub>19</sub> Nanoparticles Open
The synthesis of aluminum-substituted strontium hexaferrite nanoparticles (SrFe12‑x Al x O19 with x = 0-3), via three different preparation methods, is investigated. The synthesis methods are hydrothermal autoclave (AC) synthesis, a citrat…
View article: Crystal/magnetic structure and cation inversion in hydrothermally synthesized MnFe<sub>2</sub>O<sub>4</sub>, CoFe<sub>2</sub>O<sub>4</sub>, NiFe<sub>2</sub>O<sub>4</sub>, and ZnFe<sub>2</sub>O<sub>4</sub> nanoparticles: a neutron powder diffraction study
Crystal/magnetic structure and cation inversion in hydrothermally synthesized MnFe<sub>2</sub>O<sub>4</sub>, CoFe<sub>2</sub>O<sub>4</sub>, NiFe<sub>2</sub>O<sub>4</sub>, and ZnFe<sub>2</sub>O<sub>4</sub> nanoparticles: a neutron powder diffraction study Open
Joint PXRD and NPD analysis of crystal and magnetic structures of MnFe 2 O 4 , CoFe 2 O 4 , NiFe 2 O 4 and ZnFe 2 O 4 nanoparticles reveal how cation type affects spinel inversion, crystallite size, and magnetism.
View article: Aligned Permanent Magnet Made in Seconds–An In Situ Diffraction Study
Aligned Permanent Magnet Made in Seconds–An In Situ Diffraction Study Open
The synthesis of a strontium hexaferrite magnet is studied using in situ synchrotron powder X‐ray diffraction (PXRD) with a 16‐ms time resolution. The precursor material is cold compacted shape‐controlled goethite and strontium carbonate. …
View article: Multi-Blade detector with VMM3a-ASIC-based readout: installation and commissioning at the reflectometer Amor at PSI
Multi-Blade detector with VMM3a-ASIC-based readout: installation and commissioning at the reflectometer Amor at PSI Open
The Multi-Blade (MB) Boron-10-based neutron detector is the chosen technology for three instruments at the European Spallation Source (ESS): the two ESS reflectometers, ESTIA and FREIA, and the Test Beam Line. A fourth MB detector has been…
View article: The Chemistry of Spinel Ferrite Nanoparticle Nucleation, Crystallization, and Growth
The Chemistry of Spinel Ferrite Nanoparticle Nucleation, Crystallization, and Growth Open
The nucleation, crystallization, and growth mechanisms of MnFe2O4, CoFe2O4, NiFe2O4, and ZnFe2O4 nanocrystallites prepared from coprecipitated transition metal (TM) hydroxide precursors treated at sub-, near-, and supercritical hydrotherma…
View article: High-performance hexaferrite magnets tailored through alignment of shape-controlled nanocomposites
High-performance hexaferrite magnets tailored through alignment of shape-controlled nanocomposites Open
Nanocrystallites of strontium hexaferrite were prepared by autoclave and solid-salt-matrix synthesis and mixed in different ratios. The spark plasma sintered composite revealed enhanced magnetic properties.
View article: Defect‐Engineering by Solvent Mediated Mild Oxidation as a Tool to Induce Exchange Bias in Metal Doped Ferrites
Defect‐Engineering by Solvent Mediated Mild Oxidation as a Tool to Induce Exchange Bias in Metal Doped Ferrites Open
The crystal site occupancy of different divalent ions and the induction of lattice defects represent an additional tool for modifying the intrinsic magnetic properties of spinel ferrites nanoparticles. Here, the relevance of the lattice de…
View article: High-Performance Hexaferrite Ceramic Magnets Made from Nanoplatelets of Ferrihydrite by High-Temperature Calcination for Permanent Magnet Applications
High-Performance Hexaferrite Ceramic Magnets Made from Nanoplatelets of Ferrihydrite by High-Temperature Calcination for Permanent Magnet Applications Open
Highly aligned ceramic hexaferrite magnets with high-energy products (BH)maxand a density exceeding 90% of theoretical density have been fabricated. The precursors were an antiferromagnetic powder, a six-line ferrihydrite mixed with SrCO3,…
View article: Controlling the magnetic structure in W-type hexaferrites
Controlling the magnetic structure in W-type hexaferrites Open
W-type hexaferrites with varied Co/Zn ratios were synthesized and the magnetic order was investigated using neutron powder diffraction. In SrCo 2 Fe 16 O 27 and SrCoZnFe 16 O 27 a planar ( Cm ′ cm ′) magnetic ordering was found, rather tha…
View article: Occupational Disorder as the Origin of Flattening of the Acoustic Phonon Branches in the Clathrate Ba$_{8}$Ga$_{16}$Ge$_{30}$
Occupational Disorder as the Origin of Flattening of the Acoustic Phonon Branches in the Clathrate Ba$_{8}$Ga$_{16}$Ge$_{30}$ Open
In the search for high-performance thermoelectrics, materials such as clathrates have drawn attention due to having both glass-like low phonon thermal conductivity and crystal-like high electrical conductivity. Ba$_{8}$Ga$_{16}$Ge$_{30}$ (…
View article: Texture formation in W-type hexaferrite by cold compaction of non-magnetic interacting anisotropic shaped precursor crystallites
Texture formation in W-type hexaferrite by cold compaction of non-magnetic interacting anisotropic shaped precursor crystallites Open
Crystallites of the W-type hexaferrites, Sr(Ni 1− x Zn x ) 2 Fe 16 O 27 ( x = 0, 0.5, 1) have been aligned through a simple synthesis process taking advantage of easy alignment of non-magnetic interacting, anisotropic-shaped precursor crys…
View article: In-depth investigations of size and occupancies in cobalt ferrite nanoparticles by joint Rietveld refinements of X-ray and neutron powder diffraction data
In-depth investigations of size and occupancies in cobalt ferrite nanoparticles by joint Rietveld refinements of X-ray and neutron powder diffraction data Open
Powder X-ray diffraction (PXRD) and neutron powder diffraction (NPD) have been used to investigate the crystal structure of CoFe 2 O 4 nanoparticles prepared via different hydrothermal synthesis routes, with particular attention given to a…
View article: Combined characterization approaches to investigate magnetostructural effects in exchange-spring ferrite nanocomposite magnets
Combined characterization approaches to investigate magnetostructural effects in exchange-spring ferrite nanocomposite magnets Open
Combining multiple characterization probes (neutrons, X-rays, electrons) illustrated the hierarchical structure of exchange-spring nanocomposites & revealed unreported degradation of parent phase.
View article: CSD 1913179: Experimental Crystal Structure Determination
CSD 1913179: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: The journey from disorder to order: transformation of ferrite magnets investigated <i>in situ</i> by combined Bragg and total scattering analysis
The journey from disorder to order: transformation of ferrite magnets investigated <i>in situ</i> by combined Bragg and total scattering analysis Open
Permanent magnets are key enablers driving the 21 st century's diverse electromagnetic technologies [1].Ceramic magnets based on iron oxides are corrosion resistant and cost-effective permanent magnetic materials with minimal ecological fo…
View article: Synthesis and Characterization of a Magnetic Ceramic Using an Easily Accessible Scale Setup
Synthesis and Characterization of a Magnetic Ceramic Using an Easily Accessible Scale Setup Open
In this experiment, students explore the synthesis and physical property characterization of the magnetic material strontium hexaferrite (SrFe12O19). SrFe12O19 crystallites are prepared by a simple but fascinating sol-gel autocombustion sy…
View article: Ultrathin nanoplatelets of six-line ferrihydrite enhances the magnetic properties of hexaferrite
Ultrathin nanoplatelets of six-line ferrihydrite enhances the magnetic properties of hexaferrite Open
Texture and magnetic properties of aligned hexaferrite obtained from spark plasma sintering of nanosized sixline-ferrihydrite platelets resulting in (BH)max= 33 kJ m−3.
View article: The journey from disorder to order:transformation of ferrite magnets investigated in situ by combined Bragg and total scattering analysis
The journey from disorder to order:transformation of ferrite magnets investigated in situ by combined Bragg and total scattering analysis Open
Permanent magnets are key enablers driving the 21st century’s diverse electromagnetic technologies [1]. Ceramic magnets based on iron oxides are corrosion resistant and cost-effective permanent magnetic materials with minimal ecological fo…
View article: Hydrothermal synthesis of SrFe <sub>12</sub> O <sub>19</sub> nanoparticles: effect of the choice of base and base concentration
Hydrothermal synthesis of SrFe <sub>12</sub> O <sub>19</sub> nanoparticles: effect of the choice of base and base concentration Open
Platelet shaped strontium hexaferrite (SrFe 12 O 19 ) crystallites were hydrothermally synthesized in an autoclave to study the effect of (a) Fe/Sr molar ratio, (b) choice of base NaOH/KOH and (c) base concentration. The influence of these…
View article: Local and long-range atomic/magnetic structure of non-stoichiometric spinel iron oxide nanocrystallites
Local and long-range atomic/magnetic structure of non-stoichiometric spinel iron oxide nanocrystallites Open
Spinel iron oxide nanoparticles of different mean sizes in the range 10–25 nm have been prepared by surfactant-free up-scalable near- and super-critical hydrothermal synthesis pathways and characterized using a wide range of advanced struc…
View article: Achieving reliable UDP transmission at 10 Gb/s using BSD socket for data acquisition systems
Achieving reliable UDP transmission at 10 Gb/s using BSD socket for data acquisition systems Open
User Datagram Protocol (UDP) is a commonly used protocol for data transmission in small embedded systems. UDP as such is unreliable and packet losses can occur. The achievable data rates can suffer if optimal packet sizes are not used. The…
View article: Response of a Li-glass/multi-anode photomultiplier detector to focused proton and deuteron beams
Response of a Li-glass/multi-anode photomultiplier detector to focused proton and deuteron beams Open
The response of a position-sensitive Li-glass based scintillation detector to\nfocused beams of 2.5 MeV protons and deuterons has been investigated. The beams\nwere scanned across the detector in 0.5 mm horizontal and vertical steps\nperpe…
View article: Controlling structural and magnetic properties of SrFe <sub>12</sub> O <sub>19</sub> nanoplatelets by synthesis route and calcination time
Controlling structural and magnetic properties of SrFe <sub>12</sub> O <sub>19</sub> nanoplatelets by synthesis route and calcination time Open
Nanocrystalline platelets of Sr hexaferrite, SrFe 12 O 19 , were prepared by four techniques (two hydrothermal and two sol–gel techniques) and calcined at 1000 °C for 1, 2, 4, 8 and 16 h. The microstructure of these samples was analyzed us…