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Giant Magnetoresistance and Magnetocaloric Effect in Highly Textured Ni 45 Mn 36.5 In 13.5 Co 5 Alloys
Author(s) -
Chen Fenghua,
Shi Wenjian,
Liu Jian,
Jiang Zhengyi,
Xuan Haicheng,
Jiang Yong,
Zhang Mingang,
Zhang Kewei
Publication year - 2020
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.202000381
Subject(s) - magnetic refrigeration , materials science , magnetic field , condensed matter physics , giant magnetoresistance , magnetoresistance , scanning electron microscope , metallurgy , analytical chemistry (journal) , magnetization , composite material , chemistry , physics , chromatography , quantum mechanics
Herein, the giant magnetoresistance (MR) and magnetocaloric effect (MCE) of highly textured Ni 45 Mn 36.5 In 13.5 Co 5 alloys are investigated. The Ni 45 Mn 36.5 In 13.5 Co 5 alloys are grown using the liquid‐metal‐cooling directional solidification technique. In the scanning electron microscopy (SEM) image, unique bamboo‐like transverse stripes perpendicular to the long axis of grains are observed, which may lead to the giant MR of the sample. For the magnetic field change of 10 kOe, the giant MR value at 268 K is ≈−64%, which is rather big among similar bulk alloys. The MCE is evaluated via the magnetic entropy change. In H ⊥ and H ∥ magnetic fields of 30 kOe, the maximum entropy change Δ S mis 13.5 and 15.3 J kg −1 K −1 , and the effective refrigeration capacity (RC) reaches ≈108 and ≈117 J kg −1 . The detailed results indicate that the MCE properties of the studied alloys vary in different directions under a low magnetic field; however, the difference is not very significant under a high magnetic field.