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: $ 2.99万
• 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: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=712700
• 关键词: Unravelling; nanoscale; ordering; investigating; emerging; 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.

我的研究计划集中在研究纳米级系统独有的科学迷人且经常有用的磁性机制上的研究。总体目标是在纳米磁主义起源的量子层面上开发新的方法和理解，尤其是在界面上。产生的新知识将解决与电子级别控制材料过程相关的巨大挑战，并使用原子级量身定制的属性设计和完善新形式的物质。一个主要程序目标是确定氧化物界面之间纳米级的磁性排序过程的物理。将特别注意回答该领域当前重点指示的问题；自旋轨道耦合对界面和界面原子交换的影响，以及在接口处的dzyaloshinski -moriya相互作用，通过在铁氧化物多晶型物的纳米粒子上使用新型的过渡金属和金属氧化物壳的原型系统-Fe2O3，-Fe2O3，-Fe2O3和-Fe2O3。 拟议的计划涉及纳米材料的合成及其理论和实验投资。作为在纳米颗粒系统中制造精确控制的界面及其表征的先驱（例如，我的磁性表征技术对Springer的纳米材料技术的章节），我的HQP能够使用高质量的技术来研究高质量的界面，这些技术可以揭示体积控制的物理学以及在技术相关现象的/关闭/关闭势头的关闭/关闭现象。 HQP制造的材料是我教授的各种技能的门户，从传统的实验室技术到加速器/束线物理。除了传统工具外，我们还使用最新的X射线同步器技术和配体磁场多重计算，以及诸如Mössbauer光谱的原子问题。这项工作需要深入了解数据分析，理论和计算机建模。 HQP学会解散电子结构与磁性之间的联系，从而获得磁性的新见解并阐明新物理学。我的计划将使我们继续进行高影响力的工作，例如我们的先进材料，应用材料和界面，物理审查B和应用物理信函文章。分拆包括与丰田的合作，涉及实习计划。拟议的计划将确保HQP继续确保像Oak Ridge National Laboratory的量子冷凝物分部那样的顶级职位。 该程序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视觉：探索凝结物质和材料物理中的开放问题，例如阐明磁性接口处的物理性行为，并启用了诸如纳米复合磁铁之类的新技术。