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Rotational Magnetocaloric Effect in the Er2Fe14B Single Crystal

Skokov, Konstantin P. and Pastushenkov, Yury G. and Nikitin, Sergey A. and Fries, Maximilian and Gutfleisch, Oliver (2016):
Rotational Magnetocaloric Effect in the Er2Fe14B Single Crystal.
52, In: IEEE Transactions on Magnetics, (5), pp. 1-4, ISSN 0018-9464, [Online-Edition: http://dx.doi.org/10.1109/TMAG.2016.2530138],
[Article]

Abstract

The adiabatic temperature change ΔTad and the isothermal entropy change ΔSm were measured in a Er2Fe14B single crystal in the temperature range of 250-370 K under a magnetic field change of Δμ0H = 1.9 T. The magnetic field was applied along the crystallographic axes a and c. Under adiabatic conditions, the application of a 0.5 T field along the c-direction of the Er2Fe14B single crystal leads to a negative ΔTad at temperatures below the spin-reorientation temperature TSR = 323 K. In this case, the maximum ΔTad reaches -0.9 K in the temperature range of 270-280 K. Along the a-direction, the magnetocaloric effect above TSR is positive, and ΔTad reaches 0.68 K in the magnetic field 0.5 T at the temperatures of 320-330 K. Under isothermal conditions, the maximal magnetic entropy change is -0.86 J kg-1K-1 at 328 K when the magnetic field is applied along the a-direction and ΔSm = 1.27 J kg-1K-1 at 275 K if the single crystal is magnetized along the c-axis.

Item Type: Article
Erschienen: 2016
Creators: Skokov, Konstantin P. and Pastushenkov, Yury G. and Nikitin, Sergey A. and Fries, Maximilian and Gutfleisch, Oliver
Title: Rotational Magnetocaloric Effect in the Er2Fe14B Single Crystal
Language: English
Abstract:

The adiabatic temperature change ΔTad and the isothermal entropy change ΔSm were measured in a Er2Fe14B single crystal in the temperature range of 250-370 K under a magnetic field change of Δμ0H = 1.9 T. The magnetic field was applied along the crystallographic axes a and c. Under adiabatic conditions, the application of a 0.5 T field along the c-direction of the Er2Fe14B single crystal leads to a negative ΔTad at temperatures below the spin-reorientation temperature TSR = 323 K. In this case, the maximum ΔTad reaches -0.9 K in the temperature range of 270-280 K. Along the a-direction, the magnetocaloric effect above TSR is positive, and ΔTad reaches 0.68 K in the magnetic field 0.5 T at the temperatures of 320-330 K. Under isothermal conditions, the maximal magnetic entropy change is -0.86 J kg-1K-1 at 328 K when the magnetic field is applied along the a-direction and ΔSm = 1.27 J kg-1K-1 at 275 K if the single crystal is magnetized along the c-axis.

Journal or Publication Title: IEEE Transactions on Magnetics
Volume: 52
Number: 5
Uncontrolled Keywords: Magnetic anisotropy, Magnetic refrigeration, Magnetocaloric materials, Spin-reorientation transition, magnetic refrigeration, magnetocaloric materials, spin-reorientation transition (SRT)
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 11 May 2016 13:10
Official URL: http://dx.doi.org/10.1109/TMAG.2016.2530138
Identification Number: doi:10.1109/TMAG.2016.2530138
Funders: The work of K. P. Skokov was supported by the Russian Science Foundation under Grant 15-12-10008., The work of Y. G. Pastushenkov was supported by the Ministry of Education and Science of the Russian Federation under Grant 1598., The work of M. Fries was supported by the European Com- munity’s Seventhh Framework Programme (FP7/2007-2013) through the DRREAM under Grant 310748.
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