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A multicaloric cooling cycle that exploits thermal hysteresis
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The 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 le
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GOTTSCHALL, Tino, GRÀCIA CONDAL, Adrià, FRIES, Maximilian, TAUBLEL, A., PFEUFFER, L., MAÑOSA, Lluís, PLANES VILA, Antoni, SKOKOV, K.p., GUTFLEISCH, O.. A multicaloric cooling cycle that exploits thermal hysteresis. _Nature Materials_. 2018. Vol. 17, núm. 929-934. [consulta: 20 de gener de 2026]. ISSN: 1476-1122. [Disponible a: https://hdl.handle.net/2445/192131]