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Structural and Magnetic Properties of Nano-Sized NiZn Ferrites

100%

Ušák E., Šoka M., Ušáková M., Dobročka E.

Acta Physica Polonica A

2014

vol. 126

issue 1

68-69

Structural and magnetic properties (such as e.g. size of crystallites, lattice parameter, magnetic susceptibility, Curie temperature, etc.) of nano-sized Ni_{0.33}Zn_{0.67}Fe_{2}O_{4} ferrites have been studied. The obtained results demonstrated that the sintering temperature is an efficient and simple tool for controlling the size of crystallite particles, thus affecting the resulting magnetic properties. Straightforward relationship between the sintering temperature and the size of crystallites was found, meanwhile no other crystalline phases than the spinel one were detected by two independent analytic methods.

LSMO Films with Increased Temperature of MI Transition

88%

Španková M., Chromik Š., Dobročka E., Štrbík V., Sojková M.

Acta Physica Polonica A

2014

vol. 126

issue 1

212-213

Epitaxial La_{0.67}Sr_{0.33}MnO_{3} thin films with a significant increased temperature of metal-insulator transition (~450 K) are prepared on single crystal MgO (001) substrates using different deposition techniques - a dc magnetron sputtering or a pulsed laser deposition. The crystalline perfection of the films is characterized by X-ray diffraction technique (rocking curve measurements and reciprocal space maps). As a consequence of different methods of the film preparation we show various types of the LSMO crystal structure. Our results indicate that all the LSMO layers grown on the MgO substrate with a lattice misfit of about 8% are relaxed.

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2 Acta Physica Polonica A

2 2014

2 Dobročka E.

1 Chromik Š.

1 Sojková M.

1 Ušák E.

1 Ušáková M.

1 Šoka M.

1 Španková M.

1 Štrbík V.

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Structural and Magnetic Properties of Nano-Sized NiZn Ferrites

LSMO Films with Increased Temperature of MI Transition