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A series of rare-earth-doped Ni43-xRxMn46Sn11 (x= 0, 1 and R = Pr, Gd, Ho, Er) alloys was fabricated by arc melting, and their structural, magnetic, and magnetocaloric properties were studied through room temperature X-ray diffraction (XRD), differential scanning calorimetry, and magnetization measurements. Analysis of XRD data reveal that the alloys crystallize in the cubic L21 austenite phase structure as the major phase with a small trace of martensitic phase (MP). The martensitic transition temperature (TM) shifts to consecutive higher temperatures with the substitution of Pr, Gd, Ho, and Er. A drastic shift in TM by 60 K relative to the parent compound (TM= 195 K) was found for Ni42PrMn46Sn11. Large values of magnetic entropy changes (Δ SM) of 32 (Pr), 28 (Gd), and 25Jkg-1K-1 (Ho) were obtained at TM for Δ H = 50 kOe. A maximum value of the refrigeration capacity of ∼ 250Jkg-1 was obtained in the vicinity of TM for Δ H=50 kOe for the Ho-doped compound. A large exchange bias effect with HEB ∼ 1.1 kOe at 10 K was observed for the Pr-doped compound in its MP.

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IEEE Transactions on Magnetics