Peculiarity of magnetocaloric and magnetoresistance effects in Ni-Mn-Sn-Fe alloy with successive metamagnetic structural transitions

Magnetocaloric and magnetoresistance properties originated from a metamagnetic structural transition were investigated in a Fe-doped Ni46.8Mn38.1Sn11.6Fe3.5 alloy. After annealing, the alloy exhibited the intermartensite phase that contributed to the multiple abrupt magnetization and resistivity changes during heating process of martensite transformation. As a result, three successive magnetic entropy change ASM peaks of 10.7, 14.5 and 9.7 J/kg & BULL;K at temperatures 275, 279 and 285 K respectively were observed, which was responsible for a wide working temperature span ATFWHM of 273-287 K and thus a large effective refrigeration capacity RCeff of 98.1 J/ kg under 5.0 T. At the same time, a large negative magnetoresistance MR (e.g. over 26.7% at 275 K) was also revealed during heating process under 5.0 T. Such multi-functional magnetocaloric and magnetoresistance ef-fects render Ni-Mn-Sn-Fe alloys promising working materials for magnetic refrigerants, information storage and thermal magnetoelectricity conversions.

Automated summary

In this study, the magnetocaloric and magnetoresistance properties of Fe-doped Ni-Mn-Sn-Fe alloy during a metamagnetic structural transition were investigated. The alloy exhibited intermartensite phase after annealing, leading to multiple abrupt magnetization and resistivity changes during the heating process of martensite transformation. The results showed continuous magnetic entropy change peaks and large negative magnetoresistance under 5.0 T.