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Magnetic Behaviour of Ferritin Nanoparticles

100%
Miglierini M., Lancok A.
|
EN
Characterization of magnetic behaviour of ferritin nanoparticles of biological origin is presented. Two types of samples prepared from human and horse spleen tissues were investigated by ^{57}Fe Mössbauer spectrometry. At room temperature, ferritin nanoparticles exhibit superparamagnetic behaviour due to their small dimensions. First occurrence of magnetic interactions was noticed below 60 K. Blocking temperature of human and horse ferritin nanoparticles was determined to be of 16 K and 32 K, respectively.
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Influence of Cobalt Substitution on Hyperfine Interactions in (Fe_{1-x}Co_x)_{76}Mo_8Cu_1B_{15} Alloys

71%
Kaňčuch T., Miglierini M., Lancok A., Švec P., Illeková E.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
63-66
EN
The effect of cobalt substitution on structure, magnetic behaviour, magnetic arrangement, and hyperfine interactions in (Fe_{1-x}Co_x)_{76}Mo_8Cu_1B_{15} (x = 0, 0.1, 0.2, 0.25, 0.5) is studied by the Mössbauer spectrometry for both as-quenched and annealed alloys. Partial substitution of Fe by Co resulted in an enhancement of the average value of hyperfine magnetic field distributions as a function of x probably due to higher magnetic moment of Co. After annealing, a two-phase nanocrystalline structure composed of amorphous matrix and bcc-FeCo nanocrystallites was observed. Mössbauer spectra were fitted with up to four six-line patterns of narrow lines assigned to different number of Co nearest neighbours inside a bcc-FeCo lattice.
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