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The Investigation of Spin Seebeck Effect in Co₇₉Si₁₀X Alloys

100%
Bernacki Ł., Gozdur R., Pawlak W.
Acta Physica Polonica A
|
2017
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vol. 131
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issue 4
872-874
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.
2
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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.
3
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Thermoelectric Generation Based on Spin Seebeck Effect in NiFeCuMo Alloy

100%
Guzowski B., Gozdur R., Lakomski M.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
541-543
EN
An overview of the achieved Inverse Spin Hall Effect voltage (V_{ISHE}) is presented to find upper limit of this V_{ISHE}. Comprehensive review confirms that the most significant spin systems are based on YIG substrate. The Pt ISHE interfaces are the most popular, however, the best result was reported for the Ir₂₀Mn₈₀ ISHE interface. Moreover, in this paper the transvers spin Seebeck effect (SSE) is measured in bulk sample of Ni_{76.1}Fe_{15.9}Cu_{4.3}Mo_{3.6} with Pt interface. The max. measured value of V_{ISHE} for NiFeCuMo alloy with Pt is 0.493 μV with ΔT= 21.5 K.
4
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Magnetic Properties and Flux Distribution in the LaFeCoSi/FeCoV Hybrid Structure

100%
Gozdur R., Lebioda M., Najgebauer M.
Acta Physica Polonica A
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2017
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vol. 131
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issue 5
1294-1297
EN
The study contains a description of magnetic properties of LaFeCoSi/FeCoV structure. The hybrid structure contains magnetocaloric LaFeCoSi core with high-induction ferromagnetic laminations. The magnetic field inside the magnetic structure is gained by the fringe field from FeCoV laminations. Results of modelling and experimental investigations of modified magnetic properties of LaFeCoSi/FeCoV structure were presented and discussed in the paper.
5
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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
|
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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