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.

我的研究项目集中于研究纳米级系统特有的具有科学魅力且常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，特别是在界面处。 产生的新知识将解决与在电子水平上控制材料过程以及设计和完善具有原子级定制特性的新物质形式相关的巨大挑战。 主要项目目标是确定氧化物界面之间纳米级磁有序过程的物理原理。 将特别关注回答该领域当前焦点所提出的问题；通过在氧化铁多晶型物 -Fe2O3、-Fe2O3 和 -Fe2O3 的纳米颗粒核上使用过渡金属和金属氧化物壳的新型原型系统，研究自旋轨道耦合对表面和界面原子交换的影响，以及界面处的 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 调查。 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 Springer 的纳米材料磁表征技术中的章节），我的 HQP 能够使用揭示体积控制物理原理和技术相关现象的开/关开关的技术来研究高质量界面。 HQP 制造的材料是通向我所教授的广泛技能的大门，从传统的实验室技术到加速器/束线物理学。 除了传统工具外，我们还使用最新的 X 射线同步加速器技术和配体场多重计算以及穆斯堡尔光谱等原子探针。 这项工作需要对数据分析、理论和计算机建模有深入的了解。 HQP 学习理清电子结构和磁性之间的联系，从而获得对磁性的新见解并阐明新物理学。 在我的计划中，我们将继续开展高影响力的工作，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》文章中所举例说明的那样。 衍生产品包括与丰田的合作，其中涉及实习计划。 拟议的计划将确保 HQP 继续获得顶级职位，例如橡树岭国家实验室量子凝聚态部门的职位。该计划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：探索凝聚态和材料物理中的开放问题，例如阐明磁性界面处紧急行为的物理原理，并实现诸如 纳米复合磁体。