Abstract
The relationship between crystallinity and magnetocrystalline anisotropy has been studied in a series of ultrafine barium ferrite samples prepared using the citrate precursor method. Mössbauer data have been collected at 4.2 K in an applied field of 9 T, and effective anisotropies B A have been estimated using a simple two sublattice model. For relatively well-crystallised particles (as evidenced by sharp XRD and Mössbauer lines) a correlation is observed between particle size and anisotropy, with B A ≈ 2.5 T in 50 nm particles, and B A ≈ 1.3 T in 100 m, particles. A non-crystalline phase (evidenced by strongly broadened Mössbauer lines) seen in some of the smallest samples had a larger anisotropy, B A ≈ 7.3 T.
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