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Simulation of Mössbauer Spectra of Superparamagnets under External Fields Using a Many-State Model

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Abstract

The magnetization in a uniaxial superparamagnetic particle is modelled by spin-phonon relaxation of a giant spin. A multi-level formalism is used to simulate Mössbauer superparamagnetic relaxation spectra of spatially uniformly oriented particles. A longitudinal (parallel to anisotropy direction) external magnetic field \(\vec B\) is admitted. Powder spectra spectra (\(\vec B\)=0) with log-normal volume size distribution are simulated and compared with experimental spectra. Spectra with longitudinal and transversal field are simulated in the slow and fast relaxation limit.

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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, R. Paniago & R. Magalhães-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. J. H. Dias Filho
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  3. R. Paniago
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  4. R. Magalhães-Paniago
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Pfannes, HD., Dias Filho, J.H., Paniago, R. et al. Simulation of Mössbauer Spectra of Superparamagnets under External Fields Using a Many-State Model. Hyperfine Interactions 141, 193–198 (2002). https://doi.org/10.1023/A:1021230825918

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