Rotational Magnetocaloric Effect in the Er2Fe14B Single Crystal
| Autor: | Oliver Gutfleisch, Maximilian Fries, Konstantin P. Skokov, Yury G. Pastushenkov, S.A. Nikitin |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Physics Magnetoresistance Condensed matter physics 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Isothermal process Electronic Optical and Magnetic Materials Magnetic field Magnetization Magnetic anisotropy 0103 physical sciences Magnetic refrigeration Electrical and Electronic Engineering 0210 nano-technology Single crystal |
| Zdroj: | IEEE Transactions on Magnetics. 52:1-4 |
| ISSN: | 1941-0069 0018-9464 |
| DOI: | 10.1109/tmag.2016.2530138 |
| Popis: | The adiabatic temperature change $\Delta T_{\mathrm{ ad}}$ and the isothermal entropy change $\Delta S_{m}$ were measured in a Er2Fe14B single crystal in the temperature range of 250–370 K under a magnetic field change of $\Delta \mu _{0} H = 1.9$ 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 $\Delta T_{\mathrm{ ad}}$ at temperatures below the spin-reorientation temperature $T_{\mathrm{ SR}}=323$ K. In this case, the maximum $\Delta T_{\mathrm{ ad}}$ reaches −0.9 K in the temperature range of 270–280 K. Along the $a$ -direction, the magnetocaloric effect above $T_{\mathrm{ SR}}$ is positive, and $\Delta T_{\mathrm{ ad}}$ 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 $^{-1}\text{K}^{-1}$ at 328 K when the magnetic field is applied along the $a$ -direction and $\Delta S_{m}=1.27$ J kg $^{-1}\text{K}^{-1}$ at 275 K if the single crystal is magnetized along the $c$ -axis. |
| Databáze: | OpenAIRE |
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