Approaching Ferrite-Based Exchange-Coupled Nanocomposites as Permanent Magnets.

ABSTRACT: During the past decade, CoFe₂O₄ (hard)/Co-Fe alloy (soft) magnetic nanocomposites have been routinely prepared by partial reduction of CoFe₂O₄ nanoparticles. Monoxide (i.e., FeO or CoO) has often been detected as a byproduct of the reduction, although it remains unclear whether the formation of this phase occurs during the reduction itself or at a later stage. Here, a novel reaction cell was designed to monitor the reduction in situ using synchrotron powder X-ray diffraction (PXRD). Sequential Rietveld refinements of the in situ data yielded time-resolved information on the sample composition and confirmed that the monoxide is generated as an intermediate phase. The macroscopic magnetic properties of samples at different reduction s

SUBMITTER: Granados-Miralles C 

PROVIDER: S-EPMC6066756 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature