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The Investigation of Spin Seebeck Effect in Co₇₉Si₁₀X Alloys

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Bernacki Ł., Gozdur R., Pawlak W.
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EN
The paper presents experimental study of the spin Seebeck effect based on the widely used ferromagnetic Co₇₉Si₁₀X layer, partially covered with Pt layer. The total thickness of tested sample is about 20 μm, which makes it the first confirmed presence of the spin Seebeck effect in bulk material. Experiment was carried out under magnetic flux density 300 mT, room temperature and for constant temperature difference across the sample ranging from 1 K to 21 K. The measured value of induced voltage drop achieved 0.5 μV per 1 K.
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Power Losses in LaFe_{x}Co_{y}Si_{1.1} Intermetallics near the Magnetic Phase Transition

100%
Gozdur R., Lebioda M., Bernacki Ł.
Acta Physica Polonica A
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2015
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vol. 128
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issue 1
98-103
EN
The paper presents magnetic parameters of LaFe_{x}Co_{y}Si_{1.1} bulk specimens proving strong magnetocaloric effect. The main research work was oriented on measurements of the alloy's power losses according to IEC 60404 standards and validated with unbalanced bridge method and other methods. The measurements of the LaFe_{10.8}Co_{1.1}Si_{1.1} specimens were determined in the range of temperatures near the Curie temperature where the magnetocaloric effect is the strongest. Power losses were taken into account mainly for the evaluation of usefulness and efficiency in the magnetic refrigeration applications. The results of presented measurements testify that the most suitable range of temperature and the best operational conditions are very close to the point of magnetic phase transition and slightly above it. It indicates that the magnetic state between the T_{ΔSmax} and T_{c} is more effective for the magnetic refrigeration applications due to lower power losses and high level of the isothermal changes of entropy. Operating temperature below the T_{ΔSmax} in ferromagnetic state is improper because of the increasing power losses which achieve the level of 130 mJ/kg for main frequency and decrease to 20 mJ/kg for the value of 0.1 Hz.
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Scaling of Anhysteretic Curves for LaFeCoSi Alloy near the Transition Point

76%
Gozdur R., Chwastek K., Najgebauer M., Lebioda M., Bernacki Ł., Wodzyński A.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
801-803
EN
LaFeCoSi alloys have attracted much attention as they exhibit magnetocaloric effect in near room temperature. The paper focuses on the description of anhysteretic curve for LaFeCoSi alloy for temperatures close to transition point. For this purpose the Langevin function is applied. The paper confirms that the Langevin function might be a good starting point for development of analytical models aimed at examination of magnetic properties in La-based magnetocaloric materials.
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