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Rotational Magnetocaloric Effect in the Er2Fe14B Single Crystal
- Source :
- IEEE Transactions on Magnetics. 52:1-4
- Publication Year :
- 2016
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2016.
-
Abstract
- 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.
- Subjects :
- 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
Subjects
Details
- ISSN :
- 19410069 and 00189464
- Volume :
- 52
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Magnetics
- Accession number :
- edsair.doi...........cc33fd6251acf695b65f16cda2d7c65b
- Full Text :
- https://doi.org/10.1109/tmag.2016.2530138