Effect of Ge and Al substitutions on exchange bias in Ni-Mn-Sb alloy

摘要

Magnetic properties, martensitic transition, and exchange bias in Ni_(50)Mn_(36)Sb_(14), Ni_(50)Mn_(36)Sb_(12)Ge_2, and Ni_(50)Mn_(36)Sb_(12)Al_2 alloys have been investigated. The results reveal that the martensitic transition temperatures and blocking temperature shift to low temperature for Ge substitution and shift to high temperature for Al substitution. The exchange bias field decreases/increases in case of Ge/Al substitution below blocking temperature. All the results can be ascribed to the increase/decrease of ferromagnetic interaction.