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Superparamagnetic relaxation Mössbauer spectra by phonon–magnon interaction using the multilevel method

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Abstract

A theory for superparamagnetic relaxation based on phonon-modulated exchange interaction is developed. A one-phonon direct–two-magnon inelastic scattering process is considered and it is assumed that this leads to a spin transition ∣S z > → ∣S z  ± 1> of the total spin S. Corresponding transition probabilities and from these Mössbauer patterns are calculated. The influence of sample temperature, particle size and external magnetic field is demonstrated.

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Authors and Affiliations

  1. Departamento de Física, Universidade Federal de Minas Gerais, C. P. 702, 30123-970, Belo Horizonte, M.G., Brazil

    H.-D. Pfannes, D. S. Vieira Junior & R. Paniago

  2. Departamento de Ciências Exatas, Universidade Estadual de Montes Claros, C. P. 126, 39401-089, Montes Claros, M.G., Brazil

    J. H. Dias Filho

Authors
  1. H.-D. Pfannes
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  2. D. S. Vieira Junior
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  3. R. Paniago
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  4. J. H. Dias Filho
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Correspondence to H.-D. Pfannes.

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Pfannes, HD., Vieira Junior, D.S., Paniago, R. et al. Superparamagnetic relaxation Mössbauer spectra by phonon–magnon interaction using the multilevel method. Hyperfine Interact 165, 247–252 (2005). https://doi.org/10.1007/s10751-006-9273-x

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  • DOI: https://doi.org/10.1007/s10751-006-9273-x

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