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Origin of the modulus anomaly over a wide temperature range of Mn0.70Fe0.25Cu0.05 alloy.

Authors :
Cui, Yanguang
Guo, Yunlong
Li, Yangxin
Wan, Jianfeng
Zhang, Jihua
Rong, Yonghua
Chen, Nailu
Wang, Dong
Wang, Yunzhi
Source :
Computational Materials Science. Dec2017, Vol. 140, p89-94. 6p.
Publication Year :
2017

Abstract

To reveal the origin of modulus anomaly over a wide temperature range (about 240 K) observed in Mn 0.70 Fe 0.25 Cu 0.05 alloy, a phase-field model considering antiferromagnetic (AF) transition with doping Fe was established, in which the average modulus is considered as a functional of order parameter. Simulation reveals that the pining effect by doping Fe leads to the increase of low spin non-collinear AF domain walls (LS), meanwhile, the LS domain walls gradually evolve to high spin collinear AF domains (HS) with lowering temperature, accompanying the growth of HS domains and the decrease of modulus, and vice versa. Such a dynamic antiferromagnetic domain size (DAFDZ) effect gives rise to modulus anomaly, while the proper volume ratio of LS and HS is a crucial factor for the wide temperature range of modulus anomaly. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09270256
Volume :
140
Database :
Academic Search Index
Journal :
Computational Materials Science
Publication Type :
Academic Journal
Accession number :
125546171
Full Text :
https://doi.org/10.1016/j.commatsci.2017.08.040