Unravelling nanoscale ordering by investigating the emerging pathways between electronic structure and magnetism

通过研究电子结构和磁性之间的新兴途径来揭示纳米级有序性

• 批准号: RGPIN-2018-05012
• 负责人: vanLierop, Johan
• 金额: $ 5.97万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=763119
• 关键词: Unravelling; nanoscale; ordering; investigating; emerging

My research program is concentrated on the study of the mechanisms responsible for the scientifically fascinating and often useful magnetism unique to nanoscale systems. The overarching goal is to develop new approaches and understanding at the quantum-level of nanomagnetism's origins, especially at interfaces. New knowledge generated will address grand challenges associated with controlling materials processes at the level of electrons, and designing and perfecting new forms of matter with atom-level tailored properties. A primary program objective is to identify the physics of magnetic ordering processes at the nanoscale between oxide interfaces. Special attention will be placed on answering questions directed by the field's current focus; spin-orbit coupling effects on surface and interface atomic exchange, and Dzyaloshinski-Moriya interactions at interfaces, by using novel prototype systems of transition metal and metal oxide shells on nanoparticle cores of the iron-oxide polymorphs -Fe2O3, -Fe2O3 and -Fe2O3.The proposed program involves the synthesis of nanomaterials, and their theoretical and experimental investigations. As a pioneer of fabricating precisely controlled interfaces in nanoparticle systems, and their characterization (e.g. my chapter in Magnetic Characterization Techniques for Nanomaterials by Springer), my HQP are able to investigate high quality interfaces using techniques that reveal the physics of the volume control and on/off switch of technologically relevant phenomena. Materials made by HQP are the gateway to the wide spectrum of skills I teach, ranging from conventional laboratory techniques to accelerator/beam line physics. In addition to the conventional tools, we use the newest x-ray synchrotron techniques and ligand field multiplet calculations with atomic probes like Mössbauer spectroscopy. The work requires a deep appreciation of data analysis, theory, and computer modelling. HQP learn to disentangle the connections between electronic structure and magnetism, thereby gaining novel insights of magnetism and elucidating new physics. My program will see us continue to do high impact work as exemplified in our Advanced Materials, ACS Applied Materials and Interfaces, Physical Review B, and Applied Physics Letters articles. Spin-offs include collaborations with Toyota that involve an internship program. The proposed program will ensure that HQP continue to secure top-tier positions like those in the Quantum Condensed Matter Division at Oak Ridge National Laboratory.This program builds on the tools, techniques and new materials systems I have developed and will continue to augment to enable my long term vision: Exploring open questions in condensed matter and materials physics such as elucidating the physics underlying emergent behaviour at magnetic interfaces, and enabling new technologies like nanocomposite magnets.

我的研究项目主要集中在研究纳米级系统中独特的、具有科学吸引力和经常有用的磁性的机制。总体目标是在纳米磁性起源的量子水平上开发新的方法和理解，特别是在界面上。所产生的新知识将解决与在电子水平上控制材料过程相关的重大挑战，以及设计和完善具有原子水平定制特性的新形式的物质。一个主要的程序目标是确定纳米级氧化界面之间磁有序过程的物理学。将特别注意回答该领域当前重点所指向的问题；在铁氧化物多晶-Fe2O3、-Fe2O3和-Fe2O3纳米粒子核上利用新型过渡金属和金属氧化物壳的原型体系，研究了表面和界面原子交换的自旋轨道耦合效应以及界面上的Dzyaloshinski-Moriya相互作用。该计划涉及纳米材料的合成及其理论和实验研究。作为在纳米粒子系统中制造精确控制界面及其表征的先驱（例如，我在b施普林格的纳米材料磁性表征技术章节），我的HQP能够使用揭示体积控制和技术相关现象的开/关开关的物理技术来研究高质量的界面。HQP制造的材料是通往我教授的广泛技能的门户，从传统的实验室技术到加速器/束流线物理。除了传统的工具，我们使用最新的x射线同步加速器技术和配体场多重计算与原子探针，如Mössbauer光谱。这项工作需要对数据分析、理论和计算机建模有深刻的理解。HQP学习解开电子结构和磁性之间的联系，从而获得磁性的新见解和阐明新的物理学。我的计划将看到我们继续做高影响力的工作，例如我们的先进材料，ACS应用材料和界面，物理评论B和应用物理快报文章。附带的好处包括与丰田的合作，其中包括一个实习项目。拟议的项目将确保HQP继续获得像橡树岭国家实验室量子凝聚态部门那样的顶级职位。这个项目建立在我开发的工具、技术和新材料系统的基础上，并将继续增强，以实现我的长期愿景：探索凝聚态物质和材料物理学中的开放问题，例如阐明磁性界面下紧急行为的物理学，以及实现纳米复合磁铁等新技术。