Giant magnetocaloric effect in Co2FeAl Heusler nanoalloy at high temperature (original) (raw)

We have synthesized A2-disordered Co2FeAl Heusler nanoalloy and observed giant magnetocaloric effect (GMCE) during the magnetic field induced magneto-structural phase transition (MST). The magnetic entropy change shows a positive anomaly at 1252 K. The entropy change is increased linearly with the magnetic field and a large value of 15 J/Kg is detected under a moderate field of 1.4 T near the magneto-structural phase transition temperature (Tt). It leads to a net relative cooling power of 89 J/Kg for the change of the magnetic field of 1.4 T. The Arrott plot explores the essential information of the nature of MST. This low-cost GMCE material is promising for high-temperature magnetic refrigeration in aircraft and military systems for localized cooling and suitable for shape memory application.