Achievement of a reversible giant magnetocaloric effect via exerting external hydrostatic pressure on a Ni45Co5Mn35In15 metamagnetic Heusler alloy. (2nd February 2021)

• Record Type: Journal Article
• Authors: He, Xijia; Zhang, Yuanlei; Wei, Shengxian; Cao, Yiming; Xu, Kun; Li, Zhe
• Is Part Of: Journal of physics. Volume 54:Number 16(2021)
• Publication Date: 2021-02-02
• Subjects: Heusler alloy -- martensitic transformation -- magnetocaloric effect; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/abda7f
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Magnetocaloric materials with first-order phase transition are potential refrigerant media for solid state refrigeration. In this work, the Ni45 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.