The magnetization of cobalt ferrite nanocubes of similar size, but with varying Co/Fe ratio, is extensively characterized on atomistic and nanoscopic length scales. Combination of X-ray diffraction, Mössbauer spectroscopy, magnetization measurements and polarized small-angle neutron scattering (SANS) reveals that a lower amount of cobalt leads to an enhanced magnetization. At the same time, magnetic SANS confirms no or negligible near-surface spin disorder in these highly crystalline, homogeneously magnetized nanoparticles, resulting in an exceptionally hard magnetic material with high coercivity.

Department of Chemistry Universität zu Köln Köln Germany

Faculty of Science Charles University Prague Czech Republic

ISIS Neutron and Muon Source Rutherford Appleton Laboratory Didcot United Kingdom

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Size dependence of the surface spin disorder and surface anisotropy constant in ferrite nanoparticles