项目名称: 利用软X射线磁二色技术研究室温稀磁半导体GaMnN铁磁性形成机理
项目编号: No.61204008
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 信息四处
项目作者: 邢海英
作者单位: 天津工业大学
项目金额: 32万元
中文摘要: 项目采用实验研究结合理论分析的方法研究GaMnN材料室温铁磁性起源。因同步辐射磁二色技术具有元素分辨能力、高分辨率等特性,能得到许多传统磁学测量方法所无法获得的信息。实验工作利用该技术研究MOCVD技术制备的GaMnN 薄膜和低维结构材料中不同元素的磁性、元素间磁耦合性等;Mn掺杂原子在低维材料中的分布及性质变化,探索维度及尺寸效应对材料有序度、磁性及其他性质的影响。低维纳米尺度GaMnN材料与薄膜材料研究相互补充,以充分探索材料的特性和磁性起源机理。理论工作采用密度泛函理论完全势(线性)缀加平面波+局域轨道方法,建立GaN、GaMnN超晶格结构和低维结构模型,分析GaMnN体系各元素自旋磁矩的变化和Mn化学组态的变化情况。综合实验与理论结果深入探讨并提出有效的理论分析,探索更具有说服力的理论模型解释材料的铁磁性起源。本项目的研究为推动GaMnN的应用和发展以及器件的低维化提供研究基础
中文关键词: GaMnN;同步辐射磁二色技术;密度泛函理论;铁磁性起源;
英文摘要: In the project, a combination of theoretical and experimental study of the room temperature ferromagnetism origin has been done on GaMnN films and the low-dimensional structure material grown by MOCVD. Because of the ability of elements distinguish and high-resolution, magnetic dichroism technology of synchrotron radiation has been used to investigate the magnetism of different elements, the magnetic coupling between the elements、the distribution of Mn-doped atoms in low-dimensional materials and the change of its nature. By using the complementation investigation between low-dimensional nano-scale and thin film materials of GaMnN, we fully explore the properties and the magnetic origin of the materials. Based on density functional theory, LAPW+lo has been used to establish GaN, GaMnN superlattice structure and the low-dimensional structural model, analyze the change of spin magnetic moment of different elements and Mn chemical confaiguration. Comprehensive experimental and theoretical results, we deeply explore and propose effective analysis. Accordingly, we will provide a more convincing theoretical model to explain the origin of ferromagnetism of GaMnN. This project not only promote the GaMnN application and development but also establish the basis for the device's low dimension.
英文关键词: GaMnN;Synchrotron radiation magnetism dichroism;Density functional theory;Ferromagnetism origin;