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Inverse magnetocaloric effect and magnetoresistance associated with martensitic transition for Cu‐doped Ni‐Mn‐In Heusler alloy
Author(s) -
Liu Yang,
Jing Chao,
He Xijia,
Zhang Yuanlei,
Xu Kun,
Li Zhe
Publication year - 2017
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201600906
Subject(s) - magnetic refrigeration , materials science , magnetoresistance , diffusionless transformation , austenite , magnetic shape memory alloy , condensed matter physics , curie temperature , ferromagnetism , martensite , magnetization , alloy , metallurgy , magnetic field , magnetic domain , microstructure , physics , quantum mechanics
In this study, we reported the influence of replacing Cu for Ni on the crystal structure, martensitic transformation, and magnetic properties for polycrystalline Ni 50 −x Cu x Mn 37 In 13 ( x = 5 and 7) quaternary alloys. It was found that the studied alloys undergo a first‐order martensitic transformation from ferromagnetic austenite to paramagnetic martensite near room temperature. With increasing Cu content, the martensitic transformation significantly shifts toward a lower temperature, and fully splits off from the Curie transition of austenite, which enhances the difference in magnetization between the two phases for the alloy with x = 7. Moreover, both inverse magnetocaloric and magnetoresistance effects during reverse martensitic transformation were also studied in these two alloys. In comparison to Ni 50− x Cu x Mn 37 In 13 with x = 5, an optimized refrigerant capacity (∼100 J kg −1 ) and a considerable magnetoresistance (47%) were obtained in Ni 43 Cu 7 Mn 37 In 13 alloy for the magnetic field change of 30 kOe. In addition, the magnetic measurements with hydrostatic pressure demonstrate that the magnetoresistance in this system mainly arises due to the electron‐lattice scattering triggered by structural transition.