Spin and Dipole Ordering at Molecular Film Interfaces

分子膜界面的自旋和偶极排序

• 批准号: 1565692
• 负责人: Peter Dowben
• 金额: $ 44.29万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1565692&HistoricalAwards=false
• 关键词: Spin; Dipole; Ordering; Molecular; Film

In this project jointly funded by the Chemical Structure, Dynamic & Mechanism B Program of the Chemistry Division and the Electronic and Photonic Materials program of Materials Research division, Professor Peter A. Dowben at the University of Nebraska and Professor Ruihua Cheng at Indiana University Purdue University Indianapolis are combining molecules with large magnetic moments with molecules with large electric dipoles to create new materials with interesting spintronic properties. The goal is to achieve a molecular system where the magnetic properties can be altered by an applied electric field. If successful, the research will enable lightweight, high-speed, low-power electronic devices for a broad range of applications. This research brings together chemists, physicists, and material scientists to make and characterize the new materials. Student training includes international experiences in science for both undergraduate and graduate students, involvement in cutting edge research at the interface of chemistry and physics, and outreach activities where the students learn to communicate cutting edge research to a nontechnical audience. In more technical terms, a molecular magnetoelectric system is achieved by combinations of metal-organic compounds that demonstrate ligand control of the central metal spin state (spin crossover complexes) with ferroelectric polymers or zwitterionic, strongly dipolar molecules. One specific objective is to construct a thin-film molecular magneto-electric system where the magnetic properties of the molecular overlayer are altered by an applied electric field in either the ground state or the excited state. The starting point is the combination of an iron spin-crossover complex with the highly dipolar p-benzoquinonemonoimine zwitterion. The research project grows to include other spin crossover complexes in combination with a wide range of strongly dipolar molecules. Another objective includes the construction of a co-crystal heteromolecular structure in order to isothermally control switching between magnetic low-spin and high-spin states of selected molecules. The ultimate goal is to achieve voltage-controlled, magnetic moment-based devices of very small dimensions while delivering low-power, gigahertz, nonvolatile, local magneto-electric logic or memory operations with diminish latency time and much reduced power consumption. This project brings together investigations of fundamental interface chemistry, dipole coupling at hetero-molecular interfaces, the modeling of frontier orbitals, the fabrication of defined high-quality organic multilayers, and the characterization of magnetic induction with an applied electric field.

在这个由化学部化学结构、动力学与机理B项目和材料研究部电子和光子材料项目联合资助的项目中，内布拉斯加大学的Peter A. Dowben教授和印第安纳大学普渡大学印第安纳波利斯分校的程瑞华教授将具有大磁矩的分子与具有大电偶极子的分子结合起来，以创造具有有趣的自旋电子性质的新材料。 目标是实现一种可以通过施加电场来改变磁性的分子系统。 如果成功，该研究将使轻质、高速、低功耗电子设备应用于广泛的应用。 这项研究汇集了化学家、物理学家和材料科学家来制造和表征新材料。学生培训包括为本科生和研究生提供国际科学经验、参与化学和物理交叉领域的前沿研究，以及学生学习向非技术受众交流前沿研究的外展活动。 用更专业的术语来说，分子磁电系统是通过金属有机化合物与铁电聚合物或两性离子强偶极分子的组合来实现的，这些金属有机化合物证明了中心金属自旋态（自旋交叉络合物）的配体控制。一个具体目标是构建一种薄膜分子磁电系统，其中分子覆盖层的磁特性通过在基态或激发态施加的电场来改变。 起点是铁自旋交叉络合物与高度偶极的对苯醌单亚胺两性离子的组合。 该研究项目不断发展，包括其他自旋交叉络合物与各种强偶极分子的结合。 另一个目标包括构建共晶异分子结构，以便等温控制所选分子的磁性低自旋和高自旋状态之间的切换。 最终目标是实现尺寸非常小的电压控制、基于磁矩的设备，同时提供低功耗、千兆赫兹、非易失性、局部磁电逻辑或存储器操作，同时减少延迟时间并大大降低功耗。 该项目汇集了基础界面化学、异质分子界面偶极耦合、前沿轨道建模、定义的高质量有机多层膜的制造以及外加电场磁感应特性的研究。

项目成果

Site selective adsorption of the spin crossover complex Fe(phen)2(NCS) on Au(111)

• DOI: 10.1088/1361-648x/ab808d
• 发表时间: 2020-07-29
• 期刊: JOURNAL OF PHYSICS-CONDENSED MATTER
• 影响因子: 2.7
• 作者: Beniwal, Sumit;Sarkar, Suchetana;Enders, Axel
• 通讯作者: Enders, Axel

Probing ferroelectricity by x-ray absorption spectroscopy in molecular crystals

通过 X 射线吸收光谱探测分子晶体中的铁电性

• DOI: 10.1103/physrevmaterials.4.034401
• 发表时间: 2020
• 期刊: Physical Review Materials
• 影响因子: 3.4
• 作者: Tang, Fujie;Jiang, Xuanyuan;Ko, Hsin-Yu;Xu, Jianhang;Topsakal, Mehmet;Hao, Guanhua;N'Diaye, Alpha T.;Dowben, Peter A.;Lu, Deyu;Xu, Xiaoshan
• 通讯作者: Xu, Xiaoshan