Evolution of magnetic properties and magnetocaloric effect in TmNi1−xCuxAl ( x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1) compounds

The magnetic and magnetocaloric properties of TmNi1-xCuxAl (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1) compounds have been investigated. With the substitution of Ni by Cu, the Tm-magnetic moment rotates its direction from basal plane to the c-axis and finally becomes canted antiferromagnetism structure with...

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Bibliographic Details
Published in:Journal of applied physics 2014-05, Vol.115 (17)
Main Authors: Mo, Zhao-Jun, Shen, Jun, Chen, Gui-Feng, Yan, Li-Qin, Zheng, Xinqi, Wu, Jian-Feng, Tang, Cheng-Chun, sun, Ji-Rong, Shen, Bao-Gen
Format: Article
Language:English
Subjects:
Antiferromagnetism
Basal plane
Copper
Core loss
Hysteresis
Magnetic moments
Magnetic properties
Magnetism
Materials selection
Nickel
Refrigerants
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Summary:The magnetic and magnetocaloric properties of TmNi1-xCuxAl (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1) compounds have been investigated. With the substitution of Ni by Cu, the Tm-magnetic moment rotates its direction from basal plane to the c-axis and finally becomes canted antiferromagnetism structure with larger projected moments along the c-axis near Tord. Furthermore, large reversible magnetocaloric effects have been observed in TmNi1-xCuxAl compounds around Tord, with no thermal hysteresis and magnetic hysteresis loss. The values of −ΔSMmax and refrigerant capacity are greatly improved when the part of Ni was superseded by Cu. In particular, under the magnetic field change of 2 T, a large −ΔSMmax of TmNi0.7Cu0.3Al (10.7 J/kg K) is almost twice that of TmNiAl (5.5 J/kg K) and 17.2 J/kg K for TmCuAl around 4 K. The present results indicate that TmNi1-xCuxAl (x ≥ 0.3) compounds could be considered as good candidate materials for low-temperature and low-field magnetic refrigerant.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4861580