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1
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Magnetization Study of the AFM-FM Coexistence in the Manganite System Pr_{0.5}Ca_{0.5-x}Sr_xMnO_3

100%
Maryško M., Jirák Z.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
143-146
EN
For the manganites Pr_{0.5}Ca_{0.5-x}Sr_xMnO_3 (x=0;0.3) the temperature and cooling field dependence of the reduced remanence asymmetry indicates the antiferromagnetic exchange between the antiferromagnetic and ferromagnetic spins at the surface of the clusters. For x=0.3 we deduce the radius of the cluster in the field cooled regime to be about 20 times larger than that for x=0.
2
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Details of Magnetic Properties in Pb(Fe_{1/2}Nb_{1/2})O_{3}

81%
Maryško M., Laguta V., Raevski I.
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vol. 126
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issue 1
376-377
EN
For Pb(Fe_{0.5}Nb_{0.5})O_{3} the χ(T) and m(H) measurements up to 70 kOe were performed with the aim to estimate the antiferromagnetic (AFM) and superantiferromagnetic (SAF) contribution to χ(T). Below T_{N} the increase of χ(T) is attributed to a small part of Fe^{3+} ions in the SAF clusters. For high fields the suppression of the AFM and enhancement of the SAF susceptibility was observed. An inflection point of the m(H) curves below the Néel point suggests the presence of a spin reorientation process connected with the AFM phase.
3
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New Findings in Mössbauer Studies of Amorphous FeMoCuB NANOPERM-Type Alloy

81%
Jirásková Y., Maryško M., Miglierini M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
151-154
EN
The effect of heat treatments at 603 K (a relaxation of an amorphous structure) and at 723 K (an onset of a bulk nanocrystallization) of a rapidly quenched Fe_{76}Mo_{8}Cu_{1}B_{15} alloy is studied. The differences in sample processing are reflected in magnetization direction as seen by room- and low-temperature Mössbauer spectroscopy.
4
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Manganese Perovskite Nanoparticles and the Downturn of Inverse Susceptibility above the Curie Temperature

71%
Maryško M., Pollert E., Kaman O., Veverka P., Jirák Z.
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issue 5
792-793
EN
In the La_{0.75}Sr_{0.25}MnO_3 nanoparticle system for hyperthermia a downturn in the inverse susceptibility above the Curie temperature T_{c} was observed and interpreted in terms of a finite width of the T_{c} distribution.
5
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Magnetostructural Correlations of Nano-Sized Manganites Prepared by Different Ways

52%
Vavra M., Mihalik M., Mihalik M., Zentková M., Lazurová J., Matik M., Briančin J., Arnold Z., Maryško M.
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vol. 126
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issue 1
304-305
EN
We present the preparation and magnetostructural correlations of binary NdMnO_{3} oxide prepared by four different procedures. Nano-size particle were prepared by simple precipitation of hydroxides (PH), nitrate-glycine synthesis (NG) and self-combustion high-temperature synthesis (SHS), while sol-gel method (SG) produced particles with size of about 2 μm. The as prepared PH and SG particles exhibit amorphous structure, the orthorhombic crystal structure was observed for NG and SHS particles. As prepared PH, NG and SHS are magnetically ordered, annealing leads to magnetic ordering of SG particles.
6
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Magnetic Relaxation and Memory Effect in Nickel-Chromium Cyanide Nanoparticles

52%
Zentko A., Kavečanský V., Mihalik M., Maťaš S., Mitróová Z., Zentková M., Maryško M., Jagličić Z.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
511-514
EN
The low temperature dynamics of a magnetic nanoparticle system Ni_3[Cr(CN)_6]_2 with an average nanoparticles size of 4 nm was studied. Using different temperature and field protocols memory phenomena were studied by the DC magnetization and magnetic relaxation measurements of the system at temperatures below T_m = 19 K. Aging experiments show an absence of any waiting time dependence in the magnetization relaxation due to a field change after zero field and field cooling. This observation discriminates the dynamics of the system from the behaviour of a classical spin-glass.
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