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Dynamic Magnetic Properties of the Magnetostrictive Rapidly-Quenched Alloys

100%

Kolano R., Kolano-Burian A., Szynowski J., Polak M., Steczkowska-Kempka M.

Acta Physica Polonica A

2008

vol. 113

issue 1

131-134

This work was aimed at investigating the FeNbCuSiB and FeNiMoB type alloys exhibiting relatively high saturation magnetostriction after suitable heat treatment, which makes them suitable for application in force sensors. Samples of both alloys were prepared in a form of toroidal cores wound from amorphous ribbons obtained by melt-spinning, and then the cores were annealed under longitudinal and transverse magnetic field. An effect of the induced magnetic anisotropy and of the applied compressive stresses on the dynamic magnetic properties of both alloys within a frequency range from 50 Hz to 50 kHz was studied.

Magnetocaloric Cooling Device with Reciprocating Motion of the Magnetic Field Source

86%

Kolano R., Kolano-Burian A., Hreczka M., Polak M., Szynowski J., Tomaka W.

Acta Physica Polonica A

2016

vol. 129

issue 6

1205-1209

This paper describes the magnetic cooling device model designed and built at the Institute of Non-Ferrous Metals in Gliwice, which utilizes reciprocating motion of a magnetic field source and a cyclic flow of a coolant through regenerator. The regenerator made from gadolinum made it possible to obtain an adiabatic temperature change of 2.5 K at the magnetic field of 0.8 T. The magnetic field source was built using neodymium magnets according to our own technology. For the heat transfer, a liquid having the specific heat of about 4000 J/(kg K) has been applied. We have also developed and applied a special driving system enabling reciprocating motion of the magnetic field source and of the pistons in the hot and cold heat exchangers. The tests were made with this cooling model showing that it was possible to obtain, at the frequency of 0.5 Hz, the liquid temperature gradient of 4 K. The potential energy savings resulting from application of this device have been evaluated and compared with the literature data presenting a pre-industrial prototype of the magnetic refrigerator utilizing similar solutions to those applied in our cooling model.

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

1 2016

1 2015

1 2008

3 Kolano-Burian A.

3 Polak M.

2 Kolano R.

2 Szynowski J.

1 Hawelek L.

1 Hreczka M.

1 Kaminska M.

1 Puźniak R.

1 Radelytskyi I.

1 Steczkowska-Kempka M.

1 Tomaka W.

1 Wlodarczyk P.

1 Zackiewicz P.

Search results

Dynamic Magnetic Properties of the Magnetostrictive Rapidly-Quenched Alloys

Magnetocaloric Cooling Device with Reciprocating Motion of the Magnetic Field Source

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