Reversible magnetic-field-induced martensitic transformation over a wide temperature window in Ni42-xCoxCu8Mn37Ga13 alloys

Ni42-xCoxCu8Mn37Ga13 (0 <= x <= 14) alloys are reported to exhibit a magnetostructural transition from weakly-magnetic martensite to ferromagnetic austenite over a rather wide temperature window ranging from 200 K to 380 K. Simultaneously a large magnetization change Delta sigma of up to 105 Am-2 kg(-1) is obtained at the martensitic transformation. A reversible magnetic-field-induced martensitic transformation is realized, resulting in a large magnetocaloric effect related to the high magnetic entropy change with a broad working temperature span. This work shows how it is possible to effectively tailor the magnetostructural transition in Ni-Mn-Gaalloys so as to achieve a reversible magnetic-field-induced martensitic transformation and associated functionalities. (C) 2018 Elsevier B.V. All rights reserved.