Abstract
In the present work, we investigated magnetostructural transition behavior in Mn-rich Heusler Mn50−xFexNi41In9 (x=0, 1, 2, 3at%) ribbon materials. Microstructural observations showed that substituting Mn with Fe in Mn50Ni41In9 led to striking grain refinement from ∼50μm to 5–10μm, and formation of a secondary phase when Fe content was increased up to 2at%. Differential scanning calorimetric and thermomagnetic measurements indicated that a paramagnetic→ferromagnetic transition in austenite occurred first, followed with a weak-magnetic martensitic transition upon cooling for the Mn50−xFexNi41In9 (x=0, 1, 2). In case of Mn47Fe3Ni41In9, the martensitic transformation happened between paramagnetic austenite and weak-magnetic martensite, without the presence of the magnetic transition in austenite. The effective refrigeration capacity of Mn49Fe1Ni41In9 reached 137.1Jkg−1 under a magnetic field change of 30kOe.
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