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Room-Temperature Ferromagnetism in Zn-Mn-O, X-Ray Photoemission Surface Study

100%
Milivojević D., Babić-Stojić B., Blanuša J., Kovač J.
Acta Physica Polonica A
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2011
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vol. 120
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issue 2
311-315
EN
Room temperature ferromagnetic properties of Zn-Mn-O show evident dependence on manganese concentration and preparation conditions. We systematically studied series of samples with manganese concentration ranging from 0 to 10 at.%, prepared in air at thermal treatment temperatures ranging from 400 to 900°C. The samples were investigated by X-ray diffraction, TEM, magnetization measurements and XPS spectroscopy. XPS analyses of surface composition, chemical bonding and XPS depth profiling were successfully employed on powder revealing the chemical composition at the surface of the grains and underneath. The study emphasizes important role of the grain surface in observed room temperature ferromagnetism. It seems that the ferromagnetic phase is correlated with oxygen build up at the surface.
2
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The Effect of Polymer Immobilization on Magnetic Properties of Magnetosomes

88%
Timko M., Džarová A., Kovač J., Kopčanský P., Gojzewski H.
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issue 5
995-997
EN
The anisotropy of several PVA/magnetosomes magnetically textured films has been investigated from the point of view of magnetic properties. The thin film synthesized under the influence of a magnetic field (99 mT) shows the typical behavior of an anisotropic material. On sample textured in magnetic field the magnetisation loop measurements were performed in dependence on the direction of the external magnetic field with respect to the texture axis. The results of hysteresis measurements show that the magnetic field applied during the synthesis promotes an orientation of the chains of magnetosomes and permanently textured film is obtained after solidification. The obtained values for magnetic remanence and coercivity were dependent on the external magnetic field orientation and the alignment effect of particle moments may be clearly seen which is in agreement with the theoretical model of magnetic particle chains.
3
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Influence of AlN Buffer Layer Deposition Temperature οn Properties of GaN HVPE Layers

76%
Prażmowska J., Korbutowicz R., Wośko M., Paszkiewicz R., Kovač J., Srnanek R., Tłaczała M.
Acta Physica Polonica A
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2009
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vol. 116
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issue S
S-123-S-125
EN
Gallium nitride layers were deposited on AlN and double layer (AlN/AlGaN) buffers grown at various temperatures on Al_{2}O_{3}. Stress in layers was evaluated based on the Raman scattering and photoluminescence measurements. The obtained values were less than 1 GPa.
4
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The Influence of Morphology on Magnetic Properties of Magnetosomes

64%
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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