Abstract
Ni-rich Heusler alloys Ni52Mn48−xInx (x=15.5, 16 and 16.5) were prepared by the arc melting method. X-ray diffraction analysis revealed that the martensite has orthorhombic structure (S.G. Pmm2) at room temperature. The only alloy with x=15.5 has structural transmission from martensite to austenite without any magnetic transmission. The temperature dependence and the field dependence of the magnetization measurement indicated that the magnetization increased with the decreasing of the concerntration of Mn. The lesser the Mn atoms located in the In atom sites, the weaker the total AFM interaction in the system. Giant entropy changes ΔSM(T, H) were found in Ni52Mn48−xInx alloys with the maximum ΔSM value of 22.3JkgK for the sample with x=16.5 at 270K under the magnetic field change of 1.5T.
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