原子级厚度二维晶体的铁磁性研究

项目名称： 原子级厚度二维晶体的铁磁性研究

项目编号： No.11474137

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 高大强

作者单位： 兰州大学

项目金额： 80万元

中文摘要： 无需通过离子掺杂及外部修饰，探索具有本征室温铁磁性的原子级厚度二维材料的制备工艺，深入理解其内禀铁磁性机理，实现对其铁磁性的可调及可控，是此类材料在未来纳米自旋电子器件应用中拟解决的关键问题之一。本项目在前期工作的基础上，拟利用化学方法探索具有类石墨烯结构准二维材料的制备工艺，通过对样品宏观磁性、微观磁性及微结构的分析，得到材料的维度、厚度、结晶度、缺陷类型及浓度与其磁特性的相关规律。结合样品光电性能、电子顺磁共振和磁谱测量及第一原理计算，揭示准二维金属硫属化合物铁磁性的微观磁矩起源、磁矩间相互作用及其磁各向异性机理。同时，在实验上实现对典型样品铁磁性的可调和可控，为其在下一代纳米自旋相关电子器件中的应用提供理论依据和实验基础。

中文关键词： 二维晶体；铁磁性；室温

英文摘要： Quasi two-dimensional materials with unique optical, electrical and magnetic properties have been pay widely attention due to its potential application in spintronics and related nanoelectronic devices. Understanding the ferromagnetism mechanism of atomically thick two-dimensional crystals diluted magnetic semiconductors is one of the pivotal issues for its application in spintronic devices. Based on our preliminary work, in the proposed project we will investigate how to synthetize the atomically thick two-dimensional crystals by using chemical approach. In order to regulate the magnetic behaviour, the fabrication process will be optimized and the mechanism causing magnetism in this type of substance will be explored. Through magnetic measurements and microstructure analysis, we want to confirm the intrinsic characteristics of room temperature ferromagnetism for the quasi two-dimensional crystals. Furthermore, the relevant relationship between the occurrence of ferromagnetism and the thinkness, crystalline in the samples is going to be investigated. Combining with the strain engineering, the strain-dependent magnetic moment for the representative samples will be explored. Analyzing the samples' optical and electrical properties, electron paramagnetic resonance and magnetic spectrum measurements, as well as first principal calculation results, this research will be focused on revealing the origin of ferromagnetism in atomically thick two-dimensional crystals and illuminating the mechanism behind their stable room temperature ferromagnetism. The results will provide the theoretical and experimental basis for its future applications in spintronics and relevant multifunctional devices.

英文关键词： two-dimensional crystals;ferromagnetism;room temperature