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Mössbauer spectroscopy, superparamagnetism and ferrofluids

Pfannes, H.-D. ; Dias Filho, J. H. ; Magalhães-Paniago, R. ; López, J. L. ; Paniago, R.

Brazilian journal of physics, 2001-09, Vol.31 (3), p.409-417 [Periódico revisado por pares]

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Título:
Mössbauer spectroscopy, superparamagnetism and ferrofluids
Autor: Pfannes, H.-D. ; Dias Filho, J. H. ; Magalhães-Paniago, R. ; López, J. L. ; Paniago, R.
Assuntos: PHYSICS, MULTIDISCIPLINARY
É parte de: Brazilian journal of physics, 2001-09, Vol.31 (3), p.409-417
Descrição: Some fundamentals of Mössbauer spectroscopy and of fluctuating magnetic hyperfine interactions are reviewed. An expression for calculation of spin-phonon interaction transition probabilities on the ground of a Debye model is given. Basic ideas of superparamagnetism and classical results for low-temperature relaxation rates are presented. A theory of superparamagnetism based on spin-phonon interaction is introduced. It is shown how to calculate from this Mössbauer spectra taking all spin-levels into account. Experimental spectra of ferrofluids are compared with simulated spectra and found in good accordance.
Editor: Sociedade Brasileira de Física
Idioma: Inglês;Português

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