Magnetocaloric behavior of Mn rich Ni_(46)Cu2Mn_(43)In_(11) alloy

摘要

In this work, we studied the magnetic entropy change (△Sm) across the martensite transformation (MT) in Mn-rich Ni_(46)Cu2Mn_(43)In_(11) alloy. This compound undergoes a MT and a magnetic phase transition around the temperatures (TM=) 272 K and (T_(CA)=) 325 K, respectively. A large field induced shift (=0.28 K/kOe) of the MT temperatures is observed. An application of magnetic field (H =) of 50 kOe causes a large △Sm of 20 J/kg-K and -4.4 J/kg-K around TM and T_(CA), respectively. We also found that the change in magnetic field induced isothermal △SM(H)T is mainly depends on the induced austenite phase fraction by the applied magnetic field at that temperature. Possible reasons for the observed behaviours are comprehensively discussed.