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Spin phenomena in 2D materials – highly anisotropic magnets at the monolayer limit

二维材料中的自旋现象 – 单层极限下的高度各向异性磁体

基本信息

批准号：
405560254
负责人：
Dr. Daniel Weber
金额：
--
依托单位：
Department of Chemistry and Biochemistry
依托单位国家：
德国
项目类别：
Research Fellowships
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/405560254?language=en
关键词：
Spin phenomena 2D materials highly

项目摘要

Single layered van der Waals materials with strong bonding in two dimensions (2D) and weak bonds in the third have galvanized researchers as hosts for previously unobserved physical phenomena such as high mobility Dirac electrons and due to their potential for atomically thin electronic components in devices. Yet, investigations into collective magnetism in 2D compounds only started recently, though they could lead to loss less conduction based on a stack of a 2D ferromagnet and a topological insulator or to spin based computation at the atomic limit. One inhibiting factor is the sparsity of compounds available for experimental studies, which at the moment are restricted to the ferromagnetic insulators CrI3 and Cr2Ge2Te6. The magnetic properties of the latter compounds appear far below liquid nitrogen temperatures (< -196 °C). Here, I propose to synthesize a library of transition metal based intermetallic and cluster van der Waals compounds as well as their monolayers. To achieve these monolayers, I will apply techniques of solid state chemistry to tune the magnetic properties as well as reduce the number of defects which inhibit the separation of the van der Waals layers. The first set of syntheses will focus on creating metallic ferromagnetic monolayer compounds which are magnetic above the temperature of liquid nitrogen, possibly even room temperature. In a second set of experiments, I will investigate how to balance the co- and anti-alignment of spins by reducing the numbers of layer per stack. These subtle interaction could create frustrated magnets which features magnetic interactions on the local scale, but without long range magnetic order. The creation of monolayer compounds exhibiting metallic ferromagnetism or frustrated magnetic behavior are of interest as platforms for condensed matter experiments on the nanoscale and as atomically thin building blocks in spin based and quantum computation.

单层货车德瓦尔斯材料在二维（2D）中具有强键合，在第三个维度中具有弱键合，这激发了研究人员作为以前未观察到的物理现象的宿主，例如高迁移率狄拉克电子，以及由于它们在设备中的原子薄电子元件的潜力。然而，对2D化合物集体磁性的研究最近才开始，尽管它们可能导致基于2D铁磁体和拓扑绝缘体堆叠的损失较少的传导，或者基于原子极限的自旋计算。一个抑制因素是可用于实验研究的化合物的稀疏性，目前仅限于铁磁绝缘体CrI 3和Cr2 Ge 2 Te 6。后者化合物的磁性似乎远低于液氮温度（< -196 °C）。在这里，我建议合成一个图书馆的过渡金属为基础的金属间化合物和簇货车德瓦尔斯化合物以及它们的单分子膜。为了实现这些单层，我将应用固态化学技术来调整磁性能，以及减少缺陷的数量，抑制分离的货车德瓦尔斯层。第一组合成将集中在创造金属铁磁单层化合物，这些化合物在液氮温度以上，甚至可能在室温下具有磁性。在第二组实验中，我将研究如何通过减少每个堆栈的层数来平衡自旋的协同和反向对齐。这些微妙的相互作用可以产生受抑的磁体，其特征在于局部尺度上的磁相互作用，但没有长程磁序。表现出金属铁磁性或受抑磁性行为的单层化合物的创建作为纳米尺度上的凝聚态实验的平台和作为基于自旋和量子计算的原子薄的构建块是令人感兴趣的。