CAREER: Magnetism and Spintronics in Quasi-two-dimensional Magnetic Hybrid Metal Halides: From Bulk to 2D limit

职业：准二维磁性混合金属卤化物中的磁学和自旋电子学：从块体到二维极限

• 批准号: 2143642
• 负责人: Dali Sun
• 金额: $ 55万
• 依托单位: North Carolina 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: 2022-07-01 至 2027-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2143642&HistoricalAwards=false
• 关键词: CAREER; Magnetism; Spintronics; Quasi; two

Nontechnical DescriptionThe flow of an electronic charge through computers enables their efficient data processing, storage, and transfer of information. In addition to charge, electrons also possess the quantum property of spin. They can be found either in the ‘spin-up’ state, the ‘spin-down’ state, or the mixture of both states. Spin-based electronics - spintronics - is an enabler of quantum information science, where information is carried by spin, rather than charge. By manipulating spin, information can be processed by computers using much less power and at lower cost than is currently possible. Ultrathin films, down to an atomically thin layer, of magnetic materials will be an ideal platform for exploring fundamental spin phenomena and have great potential to create novel designs for faster and more energy efficient quantum computers. This research aims to explore the spin behavior in a new class of ‘hybrid’ magnetic materials which consist of alternating magnetic and nonmagnetic atomic layers. The interaction between the neighboring magnetic layers is weak so that they are effectively isolated from one another, from which the control of spin in ultra-thin materials can be pursued. This class of materials can be a launching pad into studying the spin states on the atomic level to enable the next generation of high-performance microprocessors. This project will also educate both high school and undergraduate students in Physics, Materials Science, and Chemistry, and provide workforce training for high technology industries. Students will experience key techniques that are used in the research through advanced lab courses that also encourage students’ independence and creativity. This wider perspective will help to attract young people to future STEM careers.Technical Description2D magnetic materials empower the direct control of spin information by manipulating magnetization at the 2D limit. This research focuses on developing a new class of quasi-2D magnetic hybrid metal halides (HMHs) that possess both low-dimensional magnetism and tailored intra-/inter-layer exchange couplings benefiting from chemical versatility. Classical 2D magnetic properties will be demonstrated from bulk crystals down to few-layered ultrathin films using a suite of magnetometers, magneto-optics, and magnetoresistance techniques. By substituting organic cations, metal, and halogen elements, control over static low-dimensional magnetic order and exchange couplings can be achieved. Variable-temperature ferromagnetic resonance and spin pumping measurements are applied to study coherently generated magnons at different magnetic phases of 2D magnetic HMHs as well as a rich structure of resonance modes induced by tunable dynamic couplings. This research extends 2D magnetism from inorganic 2D van der Waals crystals to a wide spectrum of uncharted 2D hybrid metal halides, launching a new strategy for the design of new 2D magnets. Specific senior lab projects for undergraduate students will be designed through an ‘Advanced Senior Lab’ course to disseminate the basic concepts of ferromagnetic resonance and spin pumping. A laser interferometer and magneto-optics will be disseminated through various outreach platforms and the advanced senior lab course, to integrate scientific achievements into the high school and undergraduate students’ educations. These plans provide practice for students taking a relatively open-ended science project from its early construction/debugging stages, through careful data analysis, to the point where it can be communicated clearly to other scientists. Familiarity with the rigors of this process is the most important part of their training as future scientists.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.

非技术描述电子电荷通过计算机的流动使其能够高效地进行数据处理、存储和信息传输。除了电荷，电子还具有自旋的量子特性。它们可以在“向上自旋”状态、“向下自旋”状态或两种状态的混合状态中找到。基于自旋的电子学-自旋电子学-是量子信息科学的推动者，其中信息由自旋而不是电荷携带。通过操纵自旋，计算机可以用比目前更少的功率和更低的成本来处理信息。磁性材料的超薄薄膜，低至原子级薄层，将是探索基本自旋现象的理想平台，并具有为更快，更节能的量子计算机创造新设计的巨大潜力。本研究的目的是探索一类新的“混合”磁性材料，其中包括交替的磁性和磁性原子层的自旋行为。相邻磁性层之间的相互作用很弱，使得它们彼此有效地隔离，由此可以追求超薄材料中的自旋控制。这类材料可以成为在原子水平上研究自旋状态的发射台，以实现下一代高性能微处理器。该项目还将教育高中和本科生物理，材料科学和化学，并为高科技行业提供劳动力培训。学生将通过高级实验室课程体验研究中使用的关键技术，这些课程也鼓励学生的独立性和创造力。这种更广阔的视角将有助于吸引年轻人从事未来的STEM职业。技术描述2D磁性材料通过在2D极限下操纵磁化强度来直接控制自旋信息。本研究的重点是开发一类新的准二维磁性混合金属卤化物（HMHs），具有低维磁性和定制的层内/层间交换耦合受益于化学的多功能性。经典的2D磁性能将被证明从大块晶体到几层的磁膜使用一套磁强计，磁光和磁阻技术。通过取代有机阳离子、金属和卤素元素，可以实现对静态低维磁序和交换耦合的控制。变温铁磁共振和自旋泵浦测量应用于研究相干产生的磁振子在不同的磁相位的二维磁HMH以及丰富的结构的共振模式诱导的可调谐动态耦合。这项研究将2D磁性从无机2D货车德瓦尔斯晶体扩展到未知的2D混合金属卤化物，为新的2D磁体的设计推出了新的策略。本科生的特定高级实验室项目将通过“高级高级实验室”课程设计，以传播铁磁共振和自旋泵的基本概念。将通过各种外联平台和高级实验室课程传播激光干涉仪和磁光学，将科学成果纳入高中和本科生教育。这些计划为学生提供实践，从早期的建设/调试阶段，通过仔细的数据分析，相对开放的科学项目，它可以清楚地传达给其他科学家。该奖项反映了NSF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。