Collaborative Research: DMREF: Accelerated Discovery of Artificial Multiferroics with Enhanced Magnetoelectric Coupling

合作研究：DMREF：加速发现具有增强磁电耦合的人造多铁性材料

• 批准号: 2118779
• 负责人: Li Yang
• 金额: $ 45万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-10-01 至 2025-09-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2118779&HistoricalAwards=false
• 关键词: Collaborative; Research; DMREF; Accelerated; Discovery

Non-technical Description: Developing new materials lays the foundation for technology innovations. When one material is integrated with another, new properties and functionalities can emerge in the resulting heterostructure. The choice of building blocks, however, is a challenge that is best addressed with a collaborative approach combining computational methods, material synthesis, and a broad range of characterization methods. This research will tackle a long-standing material science challenge: how to create multiferroics materials that combine long-range electric and magnetic orders. Artificial multiferroics consisting of layered magnetic two-dimensional (2D) materials interfaced with ferroelectric 2D or oxides materials will be investigated. Because the interface between the electrically ordered (ferroelectric) layer and magnetically ordered (e.g., ferromagnetic) layer is atomically flat, an enhanced coupling between the two can be used to effectively switch the magnetic order via the electrical control. These new materials can lead to technological innovations, e.g., memory devices that are compact and power-saving. Given the large number of possible choices of 2D materials, machine-learning based data mining will lead the experimental effort in synthesis and characterization of new multiferroic heterostructures in this research. Technical Description: Multiferroics are materials that simultaneously exhibit long-range electric and magnetic orders. The coupling between the electrical and magnetic polarizations, i.e., the magnetoelectric (ME) effect, can be exploited to develop low-power nanoelectronics based on voltage-control of magnetism. This research will accelerate the discovery of a new type of artificial multiferroics with enhanced magnetoelectric coupling by integrating two-dimensional (2D) van der Waals (vdW) magnets with vdW or oxide ferroelectrics. The ME effect in single-phase materials is typically weak because ferroelectricity and magnetism come from different electronic orbitals. ME coupling in synthesized composites, on the other hand, occurs exclusively at inter-materials boundaries, with small interface/bulk ratios and limited material choices. The hypothesis that a significantly enhanced ME effect can be achieved in heterostructures composed of a magnetic vdW layer and a ferroelectric vdW or oxide material will drive this integrated research activity. With a large number of established 2D magnetic and ferroelectric materials, the possible combinations of heterostructures can reach an order of 10,000 to 100,000. A computation-led approach is thus critical to accelerate the discovery of optimal artificial multiferroics with an enhanced ME effect. In this project, the predictions of new multiferroic heterostructures will be validated by materials synthesis and characterization experiments. In addition to the research efforts, this award will support the training and education of graduate and undergraduate students as the next-generation scientific and engineering workforce. This project will also develop contents and posts for social media to introduce concepts and developments of multiferroic quantum materials to engage the general public.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.

非技术描述：开发新材料奠定了技术创新的基础。当一种材料与另一种材料集成时，新的属性和功能可能会在结果的异质结构中出现。但是，构建基块的选择是一个挑战，最好采用结合计算方法，材料合成和广泛表征方法的协作方法来解决。这项研究将应对一项长期的材料科学挑战：如何创建结合远距离电和磁性订单的多形材料。将研究由由铁电2D或氧化物材料连接的分层磁性二维（2D）材料组成的人工多表情。因为电序（铁电）层和磁有序（例如铁磁层）层之间的界面在原子上是平坦的，所以可以使用两者之间的增强耦合来通过电气控制有效地切换磁性。这些新材料可以导致技术创新，例如紧凑和节能的记忆设备。鉴于2D材料的大量可能选择，基于机器学习的数据挖掘将领导在这项研究中进行新的多效异质结构的合成和表征的实验努力。 技术描述：多效应是同时表现出远距离电和磁性的材料。电气和磁化极化之间的耦合，即磁电（ME）效应，可以利用基于磁性电压控制的低功率纳米电子学。这项研究将通过将二维（2D）Van der Waals（VDW）磁铁与VDW或氧化物铁电极的二维（2D）范德华（VDW）磁铁整合在一起，从而加速具有增强磁电耦合的新型人工多表情。单相材料中的ME效应通常很弱，因为铁电和磁性来自不同的电子轨道。另一方面，在合成的复合材料中耦合，仅在材料间边界上发生，界面/散装比率很小，材料选择有限。在由磁VDW层和铁电VDW或氧化物材料组成的异质结构中可以显着增强的ME效应的假设将推动这项集成的研究活动。有了大量已建立的2D磁和铁电材料，异质结构的可能组合可以达到10,000至100,000的订单。因此，以计算为主导的方法至关重要，对于增强最佳人工多表情并增强了我的效果至关重要。在这个项目中，新的多表情异质结构的预测将通过材料合成和表征实验来验证。除研究工作外，该奖项还将支持研究生和本科生作为下一代科学和工程劳动力的培训和教育。该项目还将开发社交媒体的内容和帖子，以介绍多铁量子材料的概念和发展，以吸引公众。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响来通过评估来支持的。

项目成果

Electric field tuning of magnetic states in single magnetic molecules

• DOI: 10.1103/physrevb.106.064405
• 发表时间: 2022-08
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Yan Lu;Yun-Tong Wang;Linghan Zhu;Li Yang;Li Wang

Anisotropic Excitons Reveal Local Spin Chain Directions in a van der Waals Antiferromagnet

• DOI: 10.1002/adma.202206585
• 发表时间: 2023-02
• 期刊: Advanced Materials
• 影响因子: 29.4
• 作者: Dong Seob Kim;Di Huang;Chunhao Guo;Kejun Li;D. Rocca;Frank Y. Gao;Jeongheon Choe;David Lujan;Ting-Hsuan Wu;Kung‐Hsuan Lin;E. Baldini;Li Yang;Shivani Sharma;R. Kalaivanan;R. Sankar;Shang-Fan Lee;Y. Ping;Xiaoqin Li