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Mössbauer spectroscopic characterization of manganese and cobalt ferrite ferrofluids

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Abstract

Aqueous ferrofluids based on Mn and Co ferrites have been synthesized by a novel method. Mössbauer spectra of dried samples (average particle diameter ≈ 10 nm) were measured in the 77–340 K temperature range. CoFe2O4 spectra show no superparamagnetic (SP) relaxation, in accordance with the high magnetic anisotropy of this compound. MnFe2O4 spectra exhibit SP relaxation, from which an effectiveK=(8±3)×104 J/m3 is estimated. This value represents a 20× enhancement over intrinsic magnetocrystalline anisotropy.

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Authors and Affiliations

  1. Instituto de Física, Universidade de São Paulo, C.P. 20516, 01498, São Paulo, Brazil

    H. R. Rechenberg & F. A. Tourinho

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  1. H. R. Rechenberg
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  2. F. A. Tourinho
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Rechenberg, H.R., Tourinho, F.A. Mössbauer spectroscopic characterization of manganese and cobalt ferrite ferrofluids. Hyperfine Interact 67, 627–631 (1991). https://doi.org/10.1007/BF02398211

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