Attila Kákay et al 2004 J. Phys. A: Math. Gen. 37 6027 doi:10.1088/0305-4470/37/23/005
Attila Kákay1, M W Gutowski2, L Takacs3, V Franco4 and L K Varga1
Show affiliationsThe problem of deriving the particle size distribution directly from superparamagnetic magnetization curves is studied by three mathematical methods: (1) least-squares deviation with regularization procedure, (2) simulated annealing and (3) genetic algorithm. Software has been developed for the latest versions of all these methods and its performance compared for various models of underlying particle size distributions (Dirac δ-like, lognormal- and Gaussian-shaped). For single peak distributions all three methods give reasonable and similar results, but for bimodal distributions the genetic algorithm is the only acceptable one. The genetic algorithm is able to recover with the same precision both the lognormal and Gaussian single and double (mixed) model distributions. The sensitivity of the genetic algorithm—the most promising method—to uncertainty of measurements was also tested; correct peak position and its half width were recovered for Gaussian distributions, when the analysed data were contaminated with noise of up to 5% of MS.
75.20.-g Diamagnetism, paramagnetism, and superparamagnetism
02.60.Pn Numerical optimization
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
Issue 23 (11 June 2004)
Received 4 December 2003, in final form 8 March 2004
Published 25 May 2004
Attila Kákay et al 2004 J. Phys. A: Math. Gen. 37 6027
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