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    Wyświetlanie 1-6 z 6
    Tytuł:
    Magnetic Properties of $La_{0.8}K_{0.2}MnO_{3}$ Nanoparticles
    Autorzy:
    Mihalik, M.
    Zentková, M.
    Briančin, J.
    Fitta, M.
    Lazúrová, J.
    Vavra, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371270.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    75.47.Lx
    75.30.-m
    75.30.Kz
    Opis:
    Magnetic properties of $La_{0.8}K_{0.2}MnO_{3}$ have been studied on nanoparticles prepared by glycine-nitrate method. Crystal structure and particles size were modified by heat treatment. Crystal structure changes from orthorhombic (space group Pbma) to rhombohedral (space group R-3c) after annealing at 600°C/2 hours. The average size of particle varies with annealing from about 30 nm to 135 nm. The Curie temperature $T_{C}$ and the saturated magnetization $μ_{s}$ increase with annealing. The exchange bias effect was observed on samples with particles size smaller than 60 nm.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 312-313
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of $NdFe_{0.9}Mn_{0.1}O_{3}$
    Autorzy:
    Zentková, M.
    Lazúrová, J.
    Kováč, J.
    Mihalik, M.
    Briančin, J.
    Fitta, M.
    Kusigerski, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371226.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    75.47.Lx
    75.30.-m
    75.30.Kz
    75.30.Et
    75.30.Cr
    Opis:
    In our paper we study effect of Mn for Fe substitution on magnetic properties of $NdFe_{x-1}Mn_{x}O_{3}$ compounds for x=0 and 0.1, which have been grown by the OFZ technique. The Néel temperature decreases from $T_{N1}$=691 K to $T_{N1}$=621 K, and the anomaly in AC susceptibility, related to spin reorientation, vanishes with Mn substitution. Low temperature heat capacity measurement for sample with x=0.1 revealed that substitution of Mn for Fe shifts a Schottky-type anomaly at $T_{sh}$ to higher temperatures. Another anomaly is generated by doping at $T_{max}$=11 K. The anomaly is smeared out by magnetic field, confirming its magnetic origin.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 306-307
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of $La_{0.85}Ag_{0.15}MnO_{3}$ Nano-Powders Under Pressure
    Autorzy:
    Antoňák, M.
    Mihalik, M.
    Zentková, M.
    Vavra, M.
    Lazúrová, J.
    Fitta, M.
    Balanda, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1369756.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    75.50.Tt
    75.47.Lx
    75.30.Kz
    Opis:
    In our paper we present effect of pressure on magnetic properties of $La_{0.85}Ag_{0.15}MnO_{3}$ nanopowders prepared by glycine-nitrate method. The particle size and crystal structure were modified by heat treatment. The average size of particle varies from about 25 nm for as prepared sample to 60 nm for annealed sample. Crystal structure changes from orthorhombic to rhombohedral after annealing at 600 °C/2 hours. The Curie temperature increases with annealing and is more than doubled after annealing at 600 °C/2 hours. The exchange bias phenomenon was observed in samples with orthorhombic crystal structure with average particle size of about 25 nm. Pressure effect on the Curie temperature $T_{C}$, saturated magnetization $μ_{s}$ and exchange bias field $H_{E}$ is negligible in this case. In the case of the samples with rhombohedral structure, $T_{C}$, $μ_{s}$ and remnant magnetization $μ_{r}$ increase with pressure; the coercive field decreases with pressure.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 296-297
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetostructural Correlations of Nano-Sized Manganites Prepared by Different Ways
    Autorzy:
    Vavra, M.
    Mihalik, Marián
    Mihalik, Matúš
    Zentková, M.
    Lazurová, J.
    Matik, M.
    Briančin, J.
    Arnold, Z.
    Maryško, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371215.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    75.47.Lx
    75.30.-m
    75.75.-c
    68.37.Hk
    61.05.cp
    Opis:
    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.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 304-305
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exchange bias effect in NdFeO₃ system of nanoparticles
    Autorzy:
    Vavra, M.
    Zentková, M.
    Mihalik, M.
    Mihalik Jr., M.
    Lazúrová, J.
    Girman, V.
    Perovic, M.
    Kusigerski, V.
    Roupcova, P.
    Jaglicic, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054801.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    75.50.Tt
    75.70.Rf
    75.60.Jk
    Opis:
    We study the effect of nanometric size on the crystal structure, magnetic environment of iron and magnetization in NdFeO₃ system of nanoparticles. The average particle size of NdFeO₃ nanoparticles increases with annealing at 600°C from about 15 nm to 40 nm. The smallest particles on annealed sample have size approximately 30 nm and typically have character of single crystalline samples. All samples adopt orthorhombic crystal structure, space group Pnma with lattice parameters a =5.5817 Å, b=7.7663 Å and c =5.456 Å for as prepared sample. The presence of superparamagnetic particles was indicated by the Mössbauer measurements. The reduction of dimensionality induces a decrease of T_{N1} from 691 K to 544 K. The shift of magnetic hysteresis loop in vertical and horizontal direction was observed at low temperatures after cooling in magnetic field. We attribute such behaviour to exchange bias effect and discuss in the frame of core-shell model.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 869-871
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Jahn-Teller Distortion on Double Exchange Interaction in $La_{0.8}K_{0.2}MnO_3$ Nanoparticles
    Autorzy:
    Mihalik, M.
    Zentková, M.
    Vavra, M.
    Mihalik Jr., M.
    Lazúrová, J.
    Girman, V.
    Konieczny, P.
    Fitta, M.
    Il'kovič, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398285.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    75.47.Lx
    75.30.-m
    75.30.Kz
    Opis:
    Electric resistance and effect of hydrostatic pressure on magnetic properties has been studied on the $La_{0.8}K_{0.2}MnO_3$ nanoparticles. Magnetic phase transition is affected by pressure only slightly, the Curie temperature $T_{C}$ decreases with the rate of -1.02 K/GPa, on samples with orthorhombic structure where the Jahn-Teller distortion of lattice is large. On the other hand, $T_{C}$ increases with the rate of 20.1 K/GPa on samples with rhombohedral structure, where the Jahn-Teller distortion of lattice is absent. Insulator type of electrical resistance is characteristic feature of sample with large Jahn-Teller distortion of lattice and insulator-metal transition was observed on samples where the Jahn-Teller distortion is negligible. Our results are in line with theoretical calculation predicting that double exchange interaction is suppressed by the Jahn-Teller distortion.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 875-877
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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