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

非技术描述：开发新材料为技术创新奠定了基础。当一种材料与另一种材料相结合时，新的性质和功能会在异质结构中出现。然而，构建模块的选择是一个挑战，最好通过结合计算方法、材料合成和广泛的表征方法的协作方法来解决。这项研究将解决一个长期存在的材料科学挑战：如何创造多铁性材料，结合远程电和磁的顺序。将研究由层状磁性二维（2D）材料与铁电二维或氧化物材料界面组成的人工多铁质材料。由于电有序层（铁电）和磁有序层（如铁磁）之间的界面是原子平面的，因此两者之间的增强耦合可用于通过电气控制有效地切换磁有序。这些新材料可以带来技术创新，例如，紧凑和节能的存储设备。鉴于二维材料的大量可能选择，基于机器学习的数据挖掘将在本研究中领导新的多铁异质结构的合成和表征的实验工作。技术描述：多铁性材料是同时表现出远距离电序和磁序的材料。电极化和磁极化之间的耦合，即磁电效应，可以用来开发基于磁电压控制的低功率纳米电子学。这项研究将通过将二维范德华（vdW）磁体与vdW或氧化物铁电体集成，加速发现一种具有增强磁电耦合的新型人工多铁体。由于铁电性和磁性来自不同的电子轨道，单相材料中的ME效应通常很弱。另一方面，合成复合材料中的ME耦合仅发生在材料间边界，具有较小的界面/体积比和有限的材料选择。在磁性vdW层和铁电vdW或氧化物材料组成的异质结构中可以实现显着增强的ME效应的假设将推动这项综合研究活动。随着大量二维磁性和铁电材料的建立，异质结构的可能组合可以达到10,000到100,000个数量级。因此，以计算为主导的方法对于加速发现具有增强ME效应的最佳人工多铁性材料至关重要。在这个项目中，新的多铁异质结构的预测将通过材料合成和表征实验来验证。除了研究工作外，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。该项目还将为社交媒体开发内容和帖子，介绍多铁量子材料的概念和发展，以吸引公众。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

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.