Photo Controlled Magnetic Properties of van der Waals Layered Materials

范德华层状材料的光控磁性能

• 批准号: 2105109
• 负责人: Srinivasa Rao Singamaneni
• 金额: $ 50万
• 依托单位: University of Texas at El Paso
• 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: 2021-06-01 至 2025-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2105109&HistoricalAwards=false
• 关键词: Photo; Controlled; Magnetic; Properties; van

Nontechnical: The recent discovery of quantum magnets in the post-silicon era offers the possibility of novel applications in computing, database storage, and communications. To realize these applications, tuning the magnetic properties of these materials is an ultimate goal of physics and materials science research. A rapidly evolving research area, controlling and manipulating the magnetic properties of quantum magnets using light, has just begun. The goal of this project is to use external light as a control parameter to drive quantum magnetic phases, to advance our knowledge and understanding, and to control the emergent phases. In this project, photoexcitation across broad time-scales (seconds to femtoseconds) is used to control and manipulate the magnetic properties of these new classes of materials. Outreach activities train army personnel and veterans at Fort Bliss and White Sands Missile Range in the El Paso region. This project further provides research and peer-coaching opportunities as well as professional development seminars to further foster education in STEM fields in UTEP, which is predominantly (81%) a Hispanic serving institute. Technical: Newly discovered (quasi) two-dimensional (2D) van der Waals (vdW) magnets show unexpected magnetic properties (monolayer ferromagnetism, giant second harmonic generation, etc.,) associated with the reduced dimension, which has generated a great deal of excitement in the recent past. Previous works have shown that electric field, electrostatic doping, external pressure, and mixed halide chemistry can control the magnetic properties of these materials. Unlike the above approaches, ultrafast photoexcitation is known to control and manipulate the magnetic properties of materials much more rapidly and effectively which allows developing light controlled spin electronics. Previous researchers have measured the magnetic properties of these layered materials using light. However, controlling and manipulating their magnetic properties using light has largely been unexplored. The main objective of this research is to establish a comprehensive fundamental scientific knowledge and understanding in controlling and manipulating the magnetic behavior of vdW materials upon photoexcitation. Of specific importance, the two main goals of this combined experimental and theoretical effort are to (a) study the magnetic properties in quasi-2D and 2D CrX3 upon photoexcitation, and to (b) gain in-depth understanding on magnetic exchange interactions and 2D correlations near magnetic order in quasi-2D CrX3 alter upon photoexcitation. This effort has the potential to be extended to other emerging vdW magnetic metals, both at the quasi-2D and true 2D limit. This project provides research and educational opportunities for Hispanic students, army personnel and veterans at Fort Bliss and White Sands Missile Range in the El Paso region.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.

非技术性：在后硅时代，最近发现的量子磁铁在计算，数据库存储和通信中提供了新的应用。为了实现这些应用，调整这些材料的磁性是物理和材料科学研究的最终目标。快速发展的研究区域刚刚开始使用光控制和操纵量子磁铁的磁性。该项目的目的是使用外部光作为控制参数来驱动量子磁相，促进我们的知识和理解并控制紧急阶段。在这个项目中，跨时尺度（秒至飞秒）的光激发用于控制和操纵这些新材料的磁性。外展活动在埃尔帕索地区训练Bliss Fort Bliss和White Sands导弹范围的陆军人员和退伍军人。该项目进一步提供了研究和同行指导的机会以及专业发展研讨会，以进一步促进UTEP的STEM领域的教育，这主要是西班牙裔服务学院（81％）。技术：新发现的（准）二维（2D）范德华（VDW）磁体显示出意外的磁性特性（单层铁磁性，巨大的第二次谐波生成等），与降低的尺寸相关，这在过去最近产生了很多兴奋。 先前的工作表明，电场，静电掺杂，外部压力和混合卤化物化学可以控制这些材料的磁性。与上述方法不同，已知超快光激发可以更快，有效地控制材料的磁性，从而可以开发光控制的自旋电子。 以前的研究人员已经使用光测量了这些分层材料的磁性。然而，在很大程度上尚未探索使用光控制和操纵其磁性。这项研究的主要目的是在控制和操纵光激发时控制和操纵VDW材料的磁性时建立全面的基本科学知识和理解。具体的重要性，这种合并的实验和理论努力的两个主要目标是（a）在光激发时研究准2D和2D CRX3中的磁性，以及（b）对磁交换相互作用的深入了解，并在Quasi-2d Crx3变化时对磁性交流相互作用和2D相关性进行了深入了解。这项工作有可能扩展到其他新兴的VDW磁性金属，无论是在准2D和真2D限制下。该项目为El Paso地区的Bliss和White Sands导弹范围的西班牙裔学生，陆军人员和退伍军人提供了研究和教育机会。该奖项反映了NSF的法定任务，并被认为值得通过基金会的知识分子优点和更广泛的影响审查标准通过评估来进行评估。