Critical behavior and magnetic-entropy change of orthorhombic La0.7Ca0.2Sr0.1MnO3 J. Appl. Phys. 112, 093906 (2012) Reversible solid-state hydrogen-pump driven by magnetostructural transformation in the prototype system La(Fe,Si)13Hy J. Appl. Phys. 112, 083918 (2012) Magnetocaloric effect and nature of magnetic transition in nanoscale Pr0.5Ca0.5MnO3 J. Appl. Phys. 112, 083917 (2012) On the estimation of the magnetocaloric effect by means of microwave technique AIP Advances 2, 042120 (2012) Magnetocaloric properties of La0.7Ca0.3Mn16O3 and La0.7Ca0.3Mn18O3 manganites and their "sandwich"A systematic study of the conventional and inverse magnetocaloric effects and critical behaviors in Ni 50 Mn 50Àx Sn x (x ¼ 13 and 14) alloy ribbons has been performed. We show that although the magnetic entropy change around the second-order ferromagnetic-paramagnetic (FM-PM) transition (DS m % À4 J/kg K) in the austenitic phase is about five times smaller than that around the first-order martensitic-austenitic (M-A) transformation (DS m % 22 J/kg K), the refrigerant capacity (RC) -an important figure of merit -is about two times larger for the former case (RC % 160 J/kg) than for the latter case (RC % 75 J/kg). This finding points to an important fact that to assess the usefulness of a magnetocaloric material, one should not only consider DS m but also must evaluate both DS m and RC. Our critical analysis near the second-order FM-PM transition reveals that Sn addition tends to drive the system, in the austenitic FM phase, from the short-range (x ¼ 13) to long-range (x ¼ 14) FM order.

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