Gottschall, TinoGràcia Condal, AdriàFries, MaximilianTaublel, A.Pfeuffer, L.Mañosa, LluísPlanes Vila, AntoniSkokov, K.P.Gutfleisch, O.2023-01-122023-01-1220181476-1122https://hdl.handle.net/2445/192131The giant magnetocaloric effect, in which large thermal changes are induced in a material on the application of a magnetic field, can be used for refrigeration applications, such as the cooling of systems from a small to a relatively large scale. However, commercial uptake is limited. We propose an approach to magnetic cooling that rejects the conventional idea that the hysteresis inherent in magnetostructural phase-change materials must be minimized to maximize the reversible magnetocaloric effect. Instead, we introduce a second stimulus, uniaxial stress, so that we can exploit the hysteresis. This allows us to lock-in the ferromagnetic phase as the magnetizing field is removed, which drastically removes the volume of the magnetic field source and so reduces the amount of expensive Nd-Fe-B permanent magnets needed for a magnetic refrigerator. In addition, the mass ratio between the magnetocaloric material and the permanent magnet can be increased, which allows scaling of the cooling power of a device simply by increasing the refrigerant body. The technical feasibility of this hysteresis-positive approach is demonstrated using Ni-Mn-In Heusler alloys. Our study could le6 p.application/pdfeng(c) Gottschall, Tino et al., 2018HistèresiPropietats magnètiquesCiència dels materialsHysteresisMagnetic propertiesMaterials scienceinfo:eu-repo/semantics/article6854002023-01-12info:eu-repo/semantics/openAccess