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2 Acta Physica Polonica A

2 2015

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Magnetocaloric Effect in La_{0.8}Sr_{0.2}MnO_{3} Film

100%

Szymczak R. , Dyakonov K. , Radelytskyi I. , Dyakonov V. , Szymczak H.

nr 1

56-58

Thin epitaxial film of La_{0.8}Sr_{0.2}MnO_{3} has been deposited on yz-cut LiNbO_{3} by pulsed laser ablation. The film was characterized by X-ray diffraction and magnetic measurements as a single phase. The magnetic properties and the magnetocaloric effect have been measured as a function of magnetic field and temperature. A reasonably high magnetocaloric effect indicates that this film might provide an efficient material for micro magnetic refrigerators.

Magnetic and Structural Study of Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x} (0.25 < x < 0.32) Magnetocaloric Compounds Prepared by Arc Melting

72%

Hawelek L. , Wlodarczyk P. , Zackiewicz P. , Polak M. , Kaminska M. , Puźniak R. , Radelytskyi I. , Kolano-Burian A.

nr 1

76-80

Recently, room temperature magnetocaloric materials increasingly attracted attention in the development of magnetic refrigerators. In this paper, an effect of P/Ge substitution on the magnetic phase transition in the series of Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x} (0.25 < x < 0.32) magnetocaloric compounds prepared by the arc melting technique and subsequent homogenization process has been studied. Calorimetric and magnetization results show that the temperature of structural phase transition coincide with the Curie temperature and fall within the temperature range 270-355 K. The magnetic entropy change reaches the maximum value for the compound with x=0.28 and equals to 32 J/(kg K) for the magnetic field change of 5 T. The adiabatic temperature change for the same sample, measured using magnetocalorimeter, is equal to 1.2 K for the magnetic field change of 1.7 T. It was found that the increase of Ge content in the sample causes weakening of first order magnetic transition, which is manifested by the lowering difference in transition temperature measured in two zero-field-cooling and field-cooled-cooling regimes.