Sánchez-Alarcos Gómez, VicenteLópez García, JavierUnzueta, IraultzaPérez de Landazábal Berganzo, José IgnacioRecarte Callado, VicenteBeato López, Juan JesúsGarcía, José ÁngelPlazaola, FernandoRodríguez Velamazán, José Alberto2019-10-222021-02-0520190925-838810.1016/j.jallcom.2018.10.016https://academica-e.unavarra.es/handle/2454/35274The influence of mechanically-induced defects on the magnetostructural properties is analyzed in a Ni-Co-Mn-Sn alloy subjected to soft milling and subsequent annealing treatments. It is found that, opposite to what occurs in Ni-Mn-Sn ternary alloys, the annealing treatment affects the magnetic properties in a different way in martensite and in austenite. In particular, the saturation magnetization significantly increases in martensite after annealing whereas just a very slight variation is observed in austenite. This leads to the interesting fact that the presence of microstructural defects, far for worsening, makes the magnetocaloric effect to be higher in the as-milled state than after annealing. This behavior is explained as the result of the combination of the effect of defects on the Mn-Mn distance, the effect of Co on the magnetic exchange coupling between Mn atoms, and the effect of defects on the vibrational entropy change at the martensitic transformation.27 p.application/pdfeng© 2018 Elsevier B.V. The manuscript version is made available under the CC BY-NC-ND 4.0 license.DefectsMagnetocaloric effectNi-Mn-Sn-CoVibrational entropyinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccessAcceso abierto / Sarbide irekia