arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1105.0849cond-mat.mtrl-sci
收藏

Mn杂质在(Ga,Mn)As外延层中的扩散

Diffusion of Mn interstitials in (Ga,Mn)As epitaxial layers

L. Horák, J. Matějová, X. Martí, V. Holý, V. Novák, Z. Šobáň, S. Mangold, F. Jiménez-Villacorta

摘要:

薄(Ga,Mn)As层的磁性能在退火过程中通过间隙Mn离子向外扩散到自由表面来改善。外扩散的Mn原子参与富Mn表面层的生长,并且该层的饱和导致外扩散的抑制。我们结合高分辨率的X射线衍射与X射线吸收光谱和扩散问题的数值解的研究过程中的退火步骤序列的Mn材料的外扩散。我们的数据表明,在(Ga,Mn)As层中的电荷的不均匀分布所引起的内部电场的实质上影响的物质的外扩散。

英文摘要:

Magnetic properties of thin (Ga,Mn)As layers improve during annealing by out-diffusion of interstitial Mn ions to a free surface. Out-diffused Mn atoms participate in the growth of a Mn-rich surface layer and a saturation of this layer causes an inhibition of the out-diffusion. We combine high-resolution x-ray diffraction with x-ray absorption spectroscopy and a numerical solution of the diffusion problem for the study of the out-diffusion of Mn interstitials during a sequence of annealing steps. Our data demonstrate that the out-diffusion of the interstitials is substantially affected by the internal electric field caused by an inhomogeneous distribution of charges in the (Ga,Mn)As layer.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑