Magnetic properties near the ferromagnetic-paramagnetic transformation in the austenite phase of Ni43Mn44X2Sn11 (X = Fe and Co) Heusler alloys

International Conference and Exhibition in Advanced Materials and Microscopy 2017

材料科学;物理学

Nan, W.Z.^1 ; Thanh, T.D.^1 ; You, T.S.^2 ; Piao, H.G.^3 ; Yu, S.C.^1

Department of Physics, Chungbuk National University, Cheongju

28644, Korea, Republic of^1

Department of Chemistry, Chungbuk National University, Cheongju

28644, Korea, Republic of^2

College of Science, China Three Gorges University, Yichang

443002, China^3

关键词: Arc-melting methods;    Argon atmospheres;    Austenite phase;    Austenitic phase;    Ferromagnetic-paramagnetic;    Magnetic entropy change;    Magnetic phase transitions;    Second-order phase transition;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/343/1/012001/pdf
DOI  :  10.1088/1757-899X/343/1/012001

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this work, we present a detail study on the magnetic properties in the austenitic phase (A phase) Ni43Mn44X2Sn11 alloy with X = Fe and Co, which were prepared by an arc-melting method in an argon atmosphere. The M(T) curves of two samples exhibits a single magnetic phase transition at the Curie temperature of the ferromagnetic (FM) austenitic phase with TCA = 298 K and 334k for (X = Fe and Co) respectively. Based on the Landau theory and M(H) data measured at different temperatures, we found that the FM-PM phase transitions around TCA in both samples were the second-order phase transition. Under an applied field change of 30 kOe, around TCA , the magnetic entropy changes were found to be 0.66 J Kg-1 K-1 and 1.62 J Kg-1 K-1 for (X = Fe and Co) respectively.