Mössbauer Spectra of Noninteracting Single-Domain Ferromagnetic Particles Including Superparamagnetic Relaxation: Simplification of the Multilevel Method
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A simple method of calculation of Mössbauer relaxation spectra of single-domain ferromagnetic particle assemblies is developed from Brown's model of coherent rotation of the magnetization utilizing matrix continued fractions to compute the lineshape. The method allows one to obtain a simple analytical formula for the lineshape in the strong relaxation limit, which provides results in agreement with numerical calculations and radically simplifies analysis of the spectra.
KeywordsMössbauer relaxation spectra superparamagnetic relaxation single-domain ferromagnetic particles multilevel method matrix continued fraction method
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