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High magnetocaloric refrigeration performance requires large magnetic entropy change  ΔS   M   and broad working temperature span  ΔT   FWHM  . A fourth element doping of Co in ternary Ni-Mn-Sn alloy may significantly enhance the saturation magnetization of the alloy and thus enhance the  ΔS   M  . Here, the effects of Co-doping on the martensite transformation, magnetic properties and magnetocaloric effects (MCE) of quaternary Ni 47−x Mn 43 Sn 10 Co x  (x = 0, 6, 11) alloys were investigated. The martensite transformation temperatures decrease while austenite Curie point increases with Co content increasing to x = 6 and 11, thus broadening the temperature window for a high magnetization austenite (13.5, 91.7 and 109.1 A·m 2 /kg for x = 0, 6 and 11, respectively). Two successive magnetostructural transformations (A → 10 M and A → 10 M + 6 M) occur in the alloy x = 6, which are responsible for the giant magnetic entropy change  ΔS   M =   29.5 J/kg·K, wide working temperature span  ΔT   FWHM   = 14 K and large effective refrigeration capacity  RC   eff   = 232 J/kg under a magnetic field of 5.0 T. These results suggest that Ni 40.6 Mn 43.3 Sn 10.0 Co 6.1  alloy may act as a potential solid-state magnetic refrigerant working at room temperature.

Enhanced magnetocaloric effect in Ni-Mn-Sn-Co alloys with two successive magnetostructural transformations