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Significative enhance in magnetocaloric effect due to finite size and surfaceeffects is reported in Terbium(Tb) thin films in the helimagnetic phase(corresponding to a temperature range from $T_C$=219 K to $T_N$=231 K), forexternal fields of the order of kOe. For a Tb thin film of 6 monolayerssubmitted to an applied field ($\Delta$H= 30 kOe, $\Delta$H= 50 kOe and$\Delta$H= 70 kOe) we report a significative change in adiabatic temperature,$\Delta$T/$\Delta$H, near the N\'eel temperature, of the order ten times higherthan that observed for Tb bulk. On the other hand, for small values of themagnetic field, large thickness effects are found. For external field strengtharound few kOe, we have found that the thermal caloric efficiency increasesremarkably for ultrathin films. For an ultrathin film with 6 monolayers, wehave found $\Delta$T/$\Delta$H=43 K/T while for thicker films, with 20monolayers, $\Delta$T/$\Delta$H=22 K/T. Our results suggest that thin films ofTb are a promising material for magnetocaloric effect devices for applicationsat intermediate temperatures.

Influence of the Terbium film size for the magnetocaloric effect at low temperatures