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Magnetic refrigeration based on the magnetocaloric effect at room temperatureis one of the most attractive alternative to the current gascompression/expansion method routinely employed. Nevertheless, in giantmagnetocaloric materials, optimal refrigeration is restricted to the narrowtemperature window of the phase transition (Tc). In this work, we present thepossibility of varying this transition temperature into a same giantmagnetocaloric material by ion irradiation. We demonstrate that the transitiontemperature of iron rhodium thin films can be tuned by the bombardment of ionsof Ne 5+ with varying fluences up to 10 14 ions cm --2 , leading to optimalrefrigeration over a large 270--380 K temperature window. The Tc modificationis found to be due to the ion-induced disorder and to the density of newpoint-like defects. The variation of the phase transition temperature with thenumber of incident ions opens new perspectives in the conception of devicesusing giant magnetocaloric materials.

Modulating the phase transition temperature of giant magnetocaloric thin films by ion irradiation