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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.

Acta Physica Polonica A

2015

vol. 128

issue 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.

Spin-Glass Transition in the RCoGaO_{4} (R=Lu, Yb) Layered Cobaltites

86%

Radelytskyi I., Szymczak R., Dabkowska H., Noad H., Aleshkevych P., Szymczak H.

vol. 126

issue 1

230-231

The frequency, temperature, and the dc and ac dependences of the magnetic susceptibility of the YbCoGaO_{4} and LuCoGaO_{4} single crystals are investigated. The YbCoGaO_{4} behaves like an Ising spin glass with a strong uniaxial anisotropy. In contrast LuCoGaO_{4} is Heisenberg-like spin glass. Dynamical scaling reveals a three dimensional phase transition near Tg and yields critical exponent values between those of Heisenberg- andIsing-like systems.

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

73%

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

Acta Physica Polonica A

2015

vol. 128

issue 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.

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3 Acta Physica Polonica A

2 2015

1 2014

3 Radelytskyi I.

2 Szymczak H.

2 Szymczak R.

1 Aleshkevych P.

1 Dabkowska H.

1 Dyakonov K.

1 Dyakonov V.

1 Hawelek L.

1 Kaminska M.

1 Kolano-Burian A.

1 Noad H.

1 Polak M.

1 Puźniak R.

1 Wlodarczyk P.

1 Zackiewicz P.

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

Spin-Glass Transition in the RCoGaO_{4} (R=Lu, Yb) Layered Cobaltites

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