Iron nanoparticle assemblies: structures and magnetic behavior

Field evolution of magnetic correlation lengths in ϵ-Co nanoparticle assemblies

“…The G term describes Bragg scattering at a d-spacing characteristic of the ͑111͒ separation of a fcc lattice of nanoparticles. 16,20 Using the average surfactant thickness and the core size distribution found from TEM, the center of the G peak in the SANS data ͑0.629 nm −1 ͒ matches well to the TEM value of 0.632 nm −1 . These results suggest that the nanoparticles are crystalline and not glassy.…”

Correlated spin canting in ordered core-shellFe3O4/MnxFe3−xO4Ijiri1, Krycka2, Hunt-Isaak3 et al. 2019Phys. Rev. B341310View full textAdd to dashboardCite

“…Through a combination of alcohols with different solubilities for the particles 31,32 , the nanoparticles were self-assembled into dense arrays with an apparent close-packed facecentered cubic (FCC) stacking, as determined in previous work on related particles 33,34 ; no applied magnetic field was used in the crystal formation process. The dense arrays of nanoparticles were sealed in aluminum cells for neutron scattering measurements.…”

Tuning the Rate‐Dependent Stiffness of Materials by Exploiting Néel Relaxation of Magnetic Nanoparticles

“…For iron nanoparticles f 0 is 10 7 -10 12 Hz and K is 100 kJ m À3 , which means that 25 nm iron nanoparticles have effectively an infinite relaxation time at room temperature. [11][12][13] Magnetite has a K value of 30 kJ m À3 and thus, for the typical range of impact rates anticipated, minimum particle sizes of 14 to 16 nm are required. The effects with magnetite would not be as significant as with iron nanoparticles because they have smaller saturated magnetization M s .…”