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Negative Magnetisation and Absence of Superconductivity in RFe_4Al_8 (R=Lu, Yb) Compounds

100%
Andrzejewski B., Kowalczyk A., Toliński T.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
561-564
EN
We report researches for superconductivity and the effect of negative magnetisation in the RFe_4Al_8 (R = Lu, Yb) compounds by means of magnetic measurements and microwave absorption. Contrary to the earlier reports we do not confirm the existence of any traces of superconductivity in these compounds. Instead of the superconductivity and the Meissner effect, the YbFe_4Al_8 compound exhibits the effect of negative magnetisation, whereas the LuFe_4Al_8 compound shows an exact antiferromagnetic behaviour.
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The Influence of Morphology on Magnetic Properties of Magnetosomes

86%
Hashim A., Molčan M., Kovač J., Varchulová Z., Gojzewski H., Makowski M., Kopčansky P., Tomori Z., Timko M.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1250-1252
EN
Cultivation process was changed three times. The culture medium was enriched by more amount ferric quinate (FQ magnetosomes sample) and more amounts Wolfe's vitamin solution (WVS magnetosomes sample) comparing to normal culture medium (NP magnetosomes sample). NP sample of magnetosomes shows zero coercivity and behaves superparamagnetically. The increase of coercivity (6.5 Oe for WVS and 20 Oe for FQ) may be caused by higher value of shape anisotropy and reveals stronger magnetic correlations between particles of magnetite chains.
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Magnetic Properties of Bacterial Nanoparticles

86%
Timko M., Džarová A., Kováč J., Kopčanský P., Gojzewski H., Szlaferek A.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
381-383
EN
The objective of this study is to prepare and study magnetic properties of biological magnetic nanoparticles (magnetosomes) as a product of biomineralization process of magnetotactic bacteria Magnetospirillum sp. AMB-1. From temperature dependence of remanent magnetization and coercive field the Verwey transition is clearly seen at 105 K as a consequence of the large anisotropy along the chains of magnetosomes.
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