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Determination of 2 D distribution of magnetic nanoparticles derived from magnetization curves
Author(s) -
Chrobak A.,
Haneczok G.
Publication year - 2013
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201228827
Subject(s) - magnetization , magnetic nanoparticles , materials science , magnetic moment , condensed matter physics , simulated annealing , distribution function , annealing (glass) , distribution (mathematics) , entropy (arrow of time) , maximum entropy method , nanoparticle , computational physics , statistical physics , physics , mathematical analysis , thermodynamics , mathematics , magnetic field , algorithm , nanotechnology , quantum mechanics
This paper refers to determination of magnetic nanoparticles distribution as a function of both magnetic moment µ and energy barrier E B . The original analysis consists in a numerical analysis of experimental M ( H ) curves determined at two different temperatures and is based on the Stoner–Wohlfarth model. As it was shown, the applied “simulated annealing (SA)” calculation algorithm with additional entropy maximum condition allows characteristic distribution profiles to be determined. Moreover, from the temperature shift of the profiles, the real positions of their homological points in µ – E B space can be calculated. It should be emphasized that the novel approach does not require any preliminary assumption of a distribution shape and number of components. The proposed magnetic characterization was tested with the use of computer‐generated as well as experimental M ( H ) curves. The obtained results confirm the efficiency of the method and its usefulness in analysis of hard magnetic powder systems.