Multiscale magnetization in cobalt-doped ferrite nanocubes

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Abstract

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.

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Zákutná, D., Fischer, A., Dresen, D., Nižňanský, D., Honecker, D., Disch, S., & Mühlbauer, S. (2022). Multiscale magnetization in cobalt-doped ferrite nanocubes. Journal of Applied Crystallography, 55, 1622–1630. https://doi.org/10.1107/S1600576722010287

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