Abstract
Magnetic properties and magnetic entropy change Δ S were investigated in Heusler alloy Ni 43Mn 43Co 3Sn 11. With decreasing temperature this alloy undergoes a martensitic structural transition at T M=188 K. The incorporation of Co atoms enhances ferromagnetic exchange for parent phases. Austenitic phase with cubic structure shows strong ferromagnetic behaviors with Curie temperature T C A at 346 K, while martensitic phase shows weak ferromagnetic properties. An external magnetic field can shift T M to a lower temperature at a rate of 4.4 K/T, and a field-induced structural transition from martensitic to austenitic state takes place at temperatures near but below T M. As a result, a great magnetic entropy change with positive sign appears. The size of Δ S reaches 33 J/kg K under 5 T magnetic field. More important is that the Δ S displays a table-like peak under 5 T, which is favorable for Ericsson-type refrigerators.
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