1. Achievement of a reversible giant magnetocaloric effect via exerting external hydrostatic pressure on a Ni45Co5Mn35In15 metamagnetic Heusler alloy.
- Author
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He, Xijia, Zhang, Yuanlei, Wei, Shengxian, Cao, Yiming, Xu, Kun, and Li, Zhe
- Subjects
MAGNETOCALORIC effects ,MANGANESE alloys ,HEUSLER alloys ,HYDROSTATIC pressure ,FIRST-order phase transitions ,MAGNETIC fields - Abstract
Magnetocaloric materials with first-order phase transition are potential refrigerant media for solid state refrigeration. In this work, the Ni
45 Co5 Mn35 In15 alloy possesses a representative first-order martensitic transition (MT), which is found to be sensitive to both magnetic field and isostatic pressure with rates of ∼−6.4 K T−1 and ∼4.24 K kbar−1 . Such an active response to multi-stimuli derives from the strong coupling of the spin and the lattice. A low magnetic field of 1 T can drive nearly 100% of the total entropy change corresponding to the whole transformation in this alloy. However, the prominent magnetocaloric effect (MCE) is almost irreversible owing to the intrinsic hysteresis of the first-order phase transition. By virtue of the strong magnetostructural coupling during the MT, a hydrostatic pressure assisted magnetic field loading loop has been constructed for eliminating the hysteresis and to a large extent improve the reversibility of the MCE. [ABSTRACT FROM AUTHOR]- Published
- 2021
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