Large magnetocaloric effect of NdGa compound due to successive magnetic transitions
X. Q. Zheng,
J. W. Xu,
S. H. Shao,
H. Zhang,
J. Y. Zhang,
S. G. Wang,
Z. Y. Xu,
L. C. Wang,
J. Chen,
B. G. Shen
Affiliations
X. Q. Zheng
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
J. W. Xu
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
S. H. Shao
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
H. Zhang
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
J. Y. Zhang
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
S. G. Wang
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
Z. Y. Xu
National Institute of Metrology, Beijing 100029, P. R. China
L. C. Wang
Department of Physics, Capital Normal University, Beijing 100048, P. R. China
J. Chen
Beijing Institute of Aerospace Testing Technology, China Aerospace Science and Technology Corporation, Beijing 100074, P. R. China
B. G. Shen
State key laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences & University of Chinese Academy of Sciences, Beijing 100190, P. R. China
The magnetic behavior and MCE property of NdGa compound were studied in detail. According to the temperature dependence of magnetization (M-T) curve at 0.01 T, two sharp changes were observed at 20 K (TSR) and 42 K (TC), respectively, corresponding to spin reorientation and FM-PM transition. Isothermal magnetization curves up to 5 T at different temperatures were measured and magnetic entropy change (ΔSM) was calculated based on M-H data. Temperature dependences of –ΔSM for a field change of 0-2 T and 0-5 T show that there are two peaks on the curves corresponding to TSR and TC, respectively. The value of the two peaks is 6.4 J/kg K and 15.5 J/kg K for the field change of 0-5 T. Since the two peaks are close, the value of –ΔSM in the temperature range between TSR and TC keeps a large value. The excellent MCE performance of NdGa compound benefits from the existence of two successive magnetic transitions.
