4 years ago

Relative Cooling Power Enhancement by Tuning Magneto-structural Stability in Ni-Mn-In Heusler Alloys.

Jing-Han Chen, Joseph H. Ross Jr, Yujin Huang, Ibrahim Karaman, Jianguo Li, Nickolaus M. Bruno, William A. Shelton, Zhenhua Ning

Off-stoichiometric Ni$_2$MnIn Heusler alloys have drawn recent attention due to their large magnetocaloric entropy associated with the coupled first order magnetic and structural transformations. Here we present crystal structural, calorimetric and magnetic studies of three compositions. A significant enhancement of relative cooling power (RCP) was achieved by tuning the magnetic and structural stability through minor compositional changes, with the measured results quantitatively close to the previous prediction as a function of the ratio between the martensitic transition ($T_m$) temperature and austenite Curie temperature ($T_C$) although the maximal magnetic induced entropy ($\Delta S_{max}$) reduction is observed in the same time. The results provided a evaluation guideline of RCPs as well as magnetic-induced entropy in designing practical active materials.

Publisher URL: http://arxiv.org/abs/1710.02522

DOI: arXiv:1710.02522v4

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