Magnetoresistance and magnetocaloric properties involving strong metamagnetic behavior in Fe-doped Ni_(45)(Co_(1-x)Fe_x)5Mn_(36.6)In_(13.4) alloys

摘要

Here, we report the co-substitution of Fe and Co for Ni atoms on metamagnetic behavior, martensitic transformation, and transport and magnetocaloric properties in Ni_(45)(Co_(1-x)Fe_x)_5Mn_(36.6)In_(13.4)(x = 0～0.05) alloys. It is found that the introduction of Fe atoms stabilizes martensitic phase and shifts martensitic temperature (T_M) to higher temperature. Meanwhile, the Curie temperature T_C of parent phase notably decreases. Upon Fe doping, the low magnetization of martensitic phase keeps nearly unchanged while the magnetization of parent phase slightly decreases. As a result, the Fe-doped samples maintain strong metamagnetic behavior and show great MR and MCE in an extended temperature range around room temperature. The hysteresis loss is reduced upon Fe-doping, which leads to an enhancement of effective RC by 15%.