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Mössbauer study of small-particle maghemite

  • Magnetism and Magnetic Materials
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Abstract

Two small-particle maghemite (λ-Fe2O3) samples have been investigated with the Mössbauer effect. From the results of the model-independent hyperfine-field distribution fits some characteristic temperature-dependent parameters have been obtained. The spectra at the lowest temperatures could be fitted with two strongly overlapping hyperfine-field distributions with different isomer shifts. Spectra in applied magnetic fields ranging from 40 to 60 kOe, and at 4.2 K showed non vanishing Δm 1=0 absorption lines. The hyperfine-field distribution and canting-angle distribution method for fitting these spectra did not yield reasonable results. Therefore, a bi-dimensional hyperfine-field-canting-angle distribution has been applied, and was found to reproduce the experimental line shapes with remarkable adequacy. The resulting distribution profiles revealed a linear correlation between Hhf and the angle between the magnetic moments and the external field.

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Authors and Affiliations

  1. Laboratory of Magnetism, Gent State University, Proeftuinstraat 86, B-9000, Gent, Belgium

    P. M. A. de Bakker, E. De Grave & R. E. Vandenberghe

  2. Department of Chemistry, North Carolina State University, Box 8204, 27695, Raleigh, NC, USA

    L. H. Bowen

Authors
  1. P. M. A. de Bakker
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  2. E. De Grave
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  3. R. E. Vandenberghe
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  4. L. H. Bowen
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Senior Research Associate at the National Fund for Scientific Research, Belgium.

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de Bakker, P.M.A., De Grave, E., Vandenberghe, R.E. et al. Mössbauer study of small-particle maghemite. Hyperfine Interact 54, 493–498 (1990). https://doi.org/10.1007/BF02396078

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