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Magnetic Properties of Mn-Doped Amorphous SiO_2 Matrix

100%
Milivojević D., Babić-Stojić B., Jokanović V., Jagličić Z., Makovec D.
Acta Physica Polonica A
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2011
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vol. 120
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issue 2
316-321
EN
Samples of Mn-doped amorphous SiO_2 matrix with manganese concentration 0.7 and 3 at.% have been prepared by a sol-gel method. Transmission electron microscopy analysis has shown that the samples contain agglomerates of amorphous silica particles 10 - 20 nm in size. Two types of Mn-rich particles are dispersed in silica matrix, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High-temperature magnetic susceptibility reveals that dominant magnetic phase at higher temperatures is λ-MnO_2. At temperatures below T_{C}=43 K strong ferrimagnetism originating from the minor Mn_3O_4 phase masks the relatively weak magnetism of λ-MnO_2. Magnetic field dependence of the maximum in the zero-field-cooled magnetization for both the samples in the vicinity of 40 K, and a frequency shift of the real component of the AC magnetic susceptibility in the sample with 3 at.% Mn suggest that the magnetic moments of the smaller Mn_3O_4 nanoparticles with dimensions below 10 nm are subject to thermally activated blocking process just below the Curie temperature T_{C}. The low-temperature maximum in the zero-field-cooled magnetization observed for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments in the geometrically frustrated Mn sublattice of the λ-MnO_2 crystal structure.
2
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Magnetic Properties of (Cu_{x}Mn_{1-x})_3[Cr(CN)_6]_2·zH_2O Complexes

86%
Vavra M., Antoňák M., Jagličić Z., Mihalik M., Mihalik M., Csach K., Zentková M.
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issue 5
998-999
EN
Magnetization measurements were performed on the (Cu_{x}Mn_{1-x})_3[Cr(CN)_6]_2·zH_2O molecule-based magnets where x=0.0, 0.2, 0.25, 0.3, 0.35 0.4, 0.6, 0.8 and 1.0. Both the Curie temperature and saturated magnetization at first decrease with increasing value of x reaching the minimal value of T_{C} = 49.7 K and 0.17 μ_{B} for x=0.2 and then increase with substitution. The pronounced hysteretic behavior between zero-field cooled and field cooled regimes was observed for all samples. Magnetization changes the sign of magnetic polarization in zero-field cooled magnetization curve at the compensation temperature T_{comp} = 16 K for sample with x = 0.4. Our results indicate that the system behaves as mixed-ferri-ferromagnetic system.
3
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Magnetic Relaxation and Memory Effect in Nickel-Chromium Cyanide Nanoparticles

73%
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.
4
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Effect of Pressure on Magnetic Properties of (NH_3OH)_2CoF_4 Fluoro-Metal Complex

73%
Jagličić Z., Zentková M., Mihalik M., Drofenik M., Kristl M., Dojer B., Kasunič M., Golobič A., Jagodič M., Arnold Z.
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issue 5
1074-1075
EN
Effect of pressure on magnetic properties of a bulk fluoro-metal complex (NH_3OH)_2MF_4 was studied. Magnetization measurements suggest that a ferromagnetic transition at T_{C1} = 47 K is followed by a ferrimagnetic one at T_{C2} = 3 K. Both transition temperatures are pressure dependent with the pressure coefficients dT_{C1}/ dp = - 2.6 K/GPa and dT_{C2}/ dp = 0.26 K/GPa. The opposite sign of the coefficients is an additional indication of a different nature (ferromagnetic/antiferromagnetic) of these two transitions. The effect of pressure on low field magnetization and exchange bias phenomena is small but still visible.
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