Tunable magnetic helicity in Mn1-xFexGe: A Monte Carlo simulation

被引:4
作者
Chen, J. P. [1 ]
Xie, Y. L.
Yan, Z. B.
Liu, J-M.
机构
[1] Nanjing Univ, Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
关键词
MNSI; CRYSTAL; LATTICE; FEGE;
D O I
10.1063/1.4918632
中图分类号
O59 [应用物理学];
学科分类号
摘要
Motivated by recent experiments on B20 compound Mn1-xFexGe, we explore the variations of spin structures and magnetic helicity gamma(m) in Mn1-xFexGe as a function of concentration x, using Monte Carlo simulation. We propose a simple spin model including hybrid Dzyaloshinskii-Moriya (DM) interactions with different signs in FeGe and MnGe. The results reveal a series of spin structures with helicity gamma m varying continuously from negative values to positive values upon decreasing x (0.0 <= x <= 1.0). The simulated x-dependence of the spin structures is consistent with experimental observations, suggesting the validity of the present hybrid model. This study sheds light on control of magnetic helicity in helimagnets, by mixing crystals with different DM interactions. (C) 2015 AIP Publishing LLC.
引用
收藏
页数:4
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