Rotational Magnetocaloric Effect in the Er2Fe14B Single Crystal

The adiabatic temperature change ΔT ad and the isothermal entropy change ΔS m were measured in a Er 2 Fe 14 B single crystal in the temperature range of 250-370 K under a magnetic field change of Δμ 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 Er 2 Fe 14 B single crystal leads to a negative ΔT ad at temperatures below the spin-reorientation temperature T SR = 323 K. In this case, the maximum ΔT ad reaches -0.9 K in the temperature range of 270-280 K. Along the a-direction, the magnetocaloric effect above T SR is positive, and ΔT 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 K -1 at 328 K when the magnetic field is applied along the a-direction and ΔS m = 1.27 J kg -1 K -1 at 275 K if the single crystal is magnetized along the c-axis.