Abstract
Tuning of the magnetic interaction plays the vital role in reducing the clustering of magnetic dopant in diluted mag-netic semiconductors(DMS).Due to the not well understood magnetic mechanism and the interplay between different magnetic mechanisms,no efficient and universal tuning strategy is proposed at present.Here,the magnetic interactions and formation energies of isovalent-doped(Mn)and aliovalent(Cr)-doped LiZnAs are studied based on density functional theory(DFT).It is found that the dopant-dopant distance-dependent magnetic interaction is highly sensitive to the carrier concentration and carrier type and can only be explained by the interplay between two magnetic mechanisms,i.e.,super-exchange and Zener's p-d exchange model.Thus,the magnetic behavior and clustering of magnetic dopant can be tuned by the interplay between two magnetic mechanisms.The insensitivity of the tuning effect to U parameter suggests that our strategy could be universal to other DMS.
基金项目
陕西省自然科学基金(2013JQ1018)
Natural Science Foundation of Department of Education of Shaanxi Province of China(15JK1759)
Double Firstclass University Construction Project of Northwest University()
Chinese University of Hong Kong(CUHK)(4053084)
University Grants Committee of Hong Kong,China(24300814)
startup funding of CUHK()
NETL
NSTL
万方数据