Discovery and Control of Skyrmions in 2D van der Waals Magnets

二维范德华磁体中斯格明子的发现和控制

• 批准号: 2206987
• 负责人: Sefaattin Tongay
• 金额: $ 68.89万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-06-01 至 2025-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2206987&HistoricalAwards=false
• 关键词: Discovery; Control; Skyrmions; 2D; van

Non-technical AbstractEngineering magnetic materials has led to ground-breaking discoveries in data storage (hard-drives, records), sound engineering (electric guitars, speakers), transportation (bullet trains, suspensions), and many others. This federally funded project aims to take traditional magnetism into nanometric dimensions to realize atomic-scale magnetic patterns resembling a hedgehog’s spikes, called skyrmions. Skyrmion formation offers new functionalities in logic and information storage that are not possible in traditional magnetic materials. Through this funding, the team aims to realize skyrmions in atomically thin materials, understand their magnetic behavior, and manipulate their properties. While doing so, the project aims to discover novel classes of magnetic materials and technologies that will increase the U.S military and economic competitiveness at a global scale and open ways to realize high-performance and next-generation applications towards quantum memory, logic, and communication devices. The immediate societal impacts of the project will manifest through high-school, undergraduate and graduate student training in an active research environment as well as K-12 outreach efforts to introduce students to STEM fields and materials science. Technical AbstractMagnetic skyrmions are topologically protected nanometric size spin textures with exciting quantum properties towards information and neuro-inspired technologies. To date, the experimentally known skyrmionic platforms are restricted to bulk crystals and metallic multilayer films. The ultimate goal of this project is to experimentally stabilize skyrmions in two-dimensional (2D) and van der Waals layered materials and investigate emergent properties arising from reduced dimensions. The project will use transition metal dihalide monolayers and their moiré superlattices as a platform and it will combine theoretical and experimental studies to explore three different mechanisms for skyrmion realization: 1) inversion symmetry breaking in ferromagnetic monolayers, 2) tunable electric fields in ferromagnetic monolayers, 3) twistronics in homobilayers. The project will utilize magneto-optical Kerr, Lorentz microscopy, and diamond-NV atomic force microscope techniques to experimentally understand their magnetic properties. Density functional and Monte-Carlo studies will offer theoretical insights for complete understanding of these 2D skyrmionic platforms. The results from this project will fill a large fundamental knowledge gap in the field by establishing what hallmark characteristics are important for skyrmion formation in the monolayer and few-layer limit. Societal impacts of the project will manifest through new applications towards memory, logic, and communication devices and through cutting edge K-12 and general public outreach activities.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术抽象工程磁性材料导致数据存储（硬盘驱动器，记录），声音工程（电动吉他，扬声器），运输（子弹列车，悬架）等的开创性发现。这个由联邦资助的项目旨在将传统的磁性带入纳米尺寸，以实现类似于刺猬的尖峰的原子尺度磁性模式，称为Skyrmions。 Skyrmion地层提供了逻辑和信息存储方面的新功能，而传统磁性材料则无法使用。通过这笔资金，该团队的目标是实现原子上薄材料的天空，了解其磁性行为并操纵其特性。在这样做的同时，该项目旨在发现新颖的磁性材料和技术类别，这些磁性材料和技术将在全球范围内提高美国军事和经济竞争力，并开放方式，以实现高性能和下一代应用程序，以实现量子记忆，逻辑和通信设备。该项目的直接社会影响将通过积极的研究环境中的高中，本科和研究生培训以及K-12宣传工作来表现出来，以向学生介绍STEM领域和材料科学。技术摘要磁磁性是受拓扑保护的纳米尺寸旋转纹理，具有令人兴奋的量子特性，可用于信息和神经启发的技术。迄今为止，实验已知的Skyrmionic平台仅限于散装晶体和金属多层膜。该项目的最终目标是实验稳定在二维（2D）和范德华分层材料中的天际，并研究尺寸降低而产生的新兴特性。 The project will use transition metal dihalide monolayers and their moiré superlattices as a platform and it will combine theoretical and experimental studies to explore Three different mechanisms for skyrmion realization: 1) inversion symmetry breaking in ferromagnetic monolayers, 2) tunable electric fields in ferromagnetic monolayers, 3) twistonics in homobilayers.该项目将利用磁光kerr，洛伦兹显微镜和钻石-NV原子力显微镜技术来实验了解其磁性。密度功能和蒙特卡洛研究将提供理论见解，以完全理解这些2D Skyrmionic平台。该项目的结果将通过确定哪种标志性特征对于单层和几层限制的天空形成很重要，从而填补了该领域的巨大知识差距。该项目的社会影响将通过对记忆，逻辑和通信设备的新应用以及尖端K-12和公共外展活动表现出来。该奖项反映了NSF的法定任务，并通过基金会的智力优点和更广泛的影响标准通过评估来诚实地诚实地支持支持。

项目成果

Tunable magnetic and optical properties of transition metal dihalides by cation alloying

• DOI: 10.1103/physrevmaterials.6.084003
• 发表时间: 2022-08
• 期刊: Physical Review Materials
• 影响因子: 3.4
• 作者: Mark Blei;Jesse Kapeghian;Rounak Banerjee;P. Kolari;Blake Povilus;Y. Attarde;A. Botana;S. Tongay

Synthesis, engineering, and theory of 2D van der Waals magnets

• DOI: 10.1063/5.0025658
• 发表时间: 2021-06-01
• 期刊: APPLIED PHYSICS REVIEWS
• 影响因子: 15
• 作者: Blei, M.;Lado, J. L.;Botana, A. S.
• 通讯作者: Botana, A. S.

Damage detection through Förster Resonance Energy Transfer in mechanoresponsive polymer nanocomposites

通过力响应聚合物纳米复合材料中的福斯特共振能量转移进行损伤检测

• DOI: 10.1016/j.polymer.2020.123275
• 发表时间: 2021
• 期刊: Polymer
• 影响因子: 4.6
• 作者: Wang, Meng;Schwindt, Alexandra;Wu, Kedi;Qin, Ying;Kwan, Allison;Tongay, Sefaattin;Green, Matthew D.
• 通讯作者: Green, Matthew D.

Theory of (s+id) pairing in mixed-valent correlated metals

• DOI: 10.1103/physrevb.102.214509
• 发表时间: 2020-07
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: E. Nica;O. Erten

Monolayer Excitonic Semiconductors Integrated with Au Quasi-Periodic Nanoterrace Morphology on Fused Silica Substrates for Light-Emitting Devices

用于发光器件的熔融石英衬底上与金准周期纳米晶形态集成的单层激子半导体

• DOI: 10.1021/acsanm.0c02386
• 发表时间: 2021-01-22
• 期刊: ACS APPLIED NANO MATERIALS
• 影响因子: 5.9
• 作者: Chen, Yuheng;Li, Han;Liu, Ying
• 通讯作者: Liu, Ying