Nanoscale Analysis of Superparamagnetic Systems

• Authors: A. Chrobak , G. Ziółkowski
• Languages of publication: EN

Abstracts

EN

The paper refers to a kind of nanoscale characterization of superparamagnetic materials above and below the so-called blocking temperature. It is propose to apply the Stoner-Wohlfarth model of nanoparticles magnetization supplemented by the two-level kinetic model, determining behavior in T>0. This approach allows determination of distribution of magnetic moments and energetic barriers of magnetic objects based on magnetization curves. In many cases, the determined distribution of magnetic moments can be recalculated into average size of the magnetic objects giving finally a nano/microscaled picture of the material. The proposed method was successfully used in characterization of diluted magnetics, nanocomposites, powders and even for human hemoglobin. In the paper the basic theory and its application to the nanoscale characterization is discussed in detail.

Keywords

EN

81.07.Bc; 75.50.Tt; 75.60.-d; 76.80.+y

Discipline

• 81.07.Bc: Nanocrystalline materials
• 75.60.-d: Domain effects, magnetization curves, and hysteresis(for dynamics of domain structures, see 75.78.Fg)
• 75.50.Tt: Fine-particle systems; nanocrystalline materials
• 76.80.+y: Mössbauer effect; other γ-ray spectroscopy(see also 33.45.+x Mössbauer spectra—in atomic and molecular physics; for biophysical applications, see 87.64.kx; for chemical analysis applications, see 82.80.Ej)

• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 5
• Pages: 1371-1374

Dates

published

2017-05

Contributors

author

A. Chrobak

• Institute of Physics, Silesian University, Uniwersytecka 4, 40-007 Katowice, Poland

author

G. Ziółkowski

• Institute of Physics, Silesian University, Uniwersytecka 4, 40-007 Katowice, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.131.1371