Fe-Mn alloys: A mixed-bond spin-1/2 Ising model version

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:361

Article

Freitas, A. S.¹  de Albuquerque, Douglas F.^1,2  Moreno, N. O.¹ 

[1] Univ Fed Sergipe, Dept Fis, BR-49100000 Sao Cristovao, SE, Brazil

[2] Univ Fed Sergipe, Dept Matemat, BR-49100000 Sao Cristovao, SE, Brazil

关键词: Fe-Mn alloy;    Ising model;    EFT;   

DOI  :  10.1016/j.jmmm.2014.02.084

来源: Elsevier

【 摘 要 】

In this work, we apply the mixed bond spin 1/2 Ising model to study the magnetic properties of Fe-Mn alloys in the a phase by employing the effective field theory (EFT). Here, we suggest a new approach to the ferromagnetic coupling between nearest neighbours Fe Fe that depends on the ratio between the Mn-Mn coupling and the Fe-Mn coupling and of second power of the Mn concentration q in contrast to linear dependence considered in the other articles. Also, we propose a new probability distribution for binary alloys with mixed-bonds based on the distribution for temary alloys and we obtain a very good agreement for all considered values of q in T-q plane, in particular for q > 0.11. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free