Inverse magnetocaloric effect and negative magnetoresistance in Ni50Mn30-xFexSn20-ySby (1 ≤ x ≤ 4 and 2 ≤ y ≤ 8) alloys

High positive magnetic entropy change Delta S-m and large magnetoresistance (MR) have been measured in the martensite transition in the Ni50Mn30-xFexSn20-ySby (1 <= x <= 4 and 2 <= y <= 8) alloys. The magnetization (sigma)-magnetic field (H) plots give a large magnetocaloric effect in terms of Delta S-m similar to 22 J/kg-K in the alloy with x = 4 and y = 8. Dependence of MR on the composition change is evident from the study of temperature and magnetic field-dependent electrical resistivity rho measured at H up to 10 T. At x = 1 and y = 2, moderate MR similar to ( -)27.5% incurs at M <- A transition for a change in magnetic field Delta H = 10 T. Considerable decrease in MR to ( -)20.7% incurs in the alloy with x = 2 and y = 4 for Delta H = 10 T. The alloy with x = 4 and y = 8 shows an enhanced MR value ( -)36.2%.

Automated summary

High positive magnetic entropy change Delta S-m and large magnetoresistance (MR) were measured in the martensite transition in Ni50Mn30-xFexSn20-ySby alloys. The study showed a dependence of MR on composition change, with different alloys exhibiting varying performance.