调整磁顺序是由Li(ZnMn) As系统中的阴离子抗体缺陷驱动的
ManFu Wang1, WeiJia Tang1, JinGang Zhang1
1School of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian, 116034, P. R. China. guibing_pang@163.com.
在Li(ZnMn) As中的抗体缺陷会产生p型稀释磁性半导体. 这种缺陷工程增强了离子之间的铁磁合,为未来的材料设计提供了洞察力.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
背景情况:
- 稀释磁性半导体 (DMS) 对自旋电子应用至关重要.
- 了解缺陷机制是控制DMS属性的关键.
- ((ZnMn) As是DMS研究的一个有前途的材料.
研究的目的:
- 调查抗现场缺陷对Li(ZnMn) As.As.电子和磁性性能的影响.
- 在有缺陷的Li(ZnMn) As.As.中阐明铁磁合背后的机制.
- 设计一个具有可调节载体度的新型DMS.
主要方法:
- 使用Perdew-Burke-Ernzerhof通用梯度近似的第一原则计算.
- 电子结构和d-sp混合轨道形成的分析.
- 检查阴离子抗体缺陷 (Zn替代As).
主要成果:
- 抗位缺陷诱导d-sp杂交,增强Mn-3d电子移位.
- 一个Mn (↑) -As (↓) -Zn (↓) 通道促进间接交换合.
- Zn抗位缺陷导致受体兴奋剂和p型导电性.
- 铁磁合在存在抗现场缺陷时更受欢迎.
结论:
- 在Li(ZnMn) As中的抗体缺陷会产生具有增强铁磁相互作用的p型DMS.
- 该研究揭示了由缺陷介导的铁磁合的机制.
- 这项工作为设计具有可控制性质的新型DMS提供了理论基础.
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