Determination of hyperfine field distributions in amorphous magnets
Bentley, PM and Kilcoyne, SH 2006, 'Determination of hyperfine field distributions in amorphous magnets' , Journal of Physics Condensed Matter, 18 , pp. 7751-7759.
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We present an overview of two leading methods of determining probability distributions from M¨ossbauer spectra, using the model amorphous magnet Fe80B20. A comparison is made between the maximum-entropy method, which permits analysis using truly arbitrary parameter probability distributions, and a Voigtian-based analysis, which uses a sum of Gaussian components to create parameter distributions of pseudo-arbitrary shape. Our results indicate that, in Fe80B20, a Gaussian distribution of magnetic hyperfine fields is a very good approximation, although small deviations from a Gaussian shape are evident. We find that the apparent existence of correlations between the isomer shift and magnetic hyperfine field parameters, as found using Voigt-based analyses, may be an artefact of imposing a Gaussian shape on the parameter distributions. We conclude that maximum entropy and Voigtian analyses together provide a very powerful means of characterizing magnetic materials with M¨ossbauer spectroscopy.
|Themes:||Subjects / Themes > Q Science > QC Physics|
Subjects outside of the University Themes
|Schools:||Colleges and Schools > College of Arts & Social Sciences|
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Materials & Physics Research Centre
|Journal or Publication Title:||Journal of Physics Condensed Matter|
|Publisher:||Institute of Physics|
|Depositing User:||SH Kilcoyne|
|Date Deposited:||06 Oct 2010 14:40|
|Last Modified:||27 Sep 2011 12:21|
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