CAREER: Engineered Ferroic Superlattices for Science, Technology and Education

职业：用于科学、技术和教育的工程铁性超晶格

• 批准号: 1055413
• 负责人: Matthew Dawber
• 金额: $ 45万
• 依托单位: SUNY at Stony Brook
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-01 至 2016-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1055413&HistoricalAwards=false
• 关键词: CAREER; Engineered; Ferroic; Superlattices; Science

NON-TECHNICAL DESCRIPTION: This experimental project is focused on the development of new artificially layered materials with engineered electrical and magnetic properties. With the state of the art deposition facilities in the PI's laboratory, the thickness of the stacked layers in the fabricated materials can be controlled on the atomic scale. The high perfection of the interfaces in these layered structures enables new interactions between the constituent materials to arise, and the result is novel behavior that could be the basis for improved performance in a number of crucial device applications, such as non-volatile computer memories, sensors, actuators and energy harvesters. A suite of cutting edge experimental tools, both in the PI's lab and at user facilities at Brookhaven National Laboratory are being used to probe the physics of the new materials, and build the required understanding for their optimization. The breadth of techniques utilized provides a long-term training benefit to the students carrying out the research. Tightly integrated with the research plan is an educational outreach program built around the development and dissemination of a set of unique and engaging teaching kits. Specific efforts are made to target diversity goals, largely by tapping into the extraordinarily diverse student community and existing educational outreach programs at Stony Brook University.TECHNICAL DETAILS: Perovskite oxides are ideal "building blocks" for artificial materials because within relatively similar crystal structures they possess an extraordinary variety of complex structural distortions and associated functional properties. The key materials of interest in this project are either ferroic (ferroelectric, ferromagnetic, or ferroelastic) or multiferroic (exhibiting the combination of two or more ferroic properties in the same material). Recently there have been some astonishing examples in oxide materials in which behavior markedly different from bulk material properties is achieved by careful control of the interfaces. The central concept of the research is to use interfacial interactions, along with strain and electrostatics, to construct new ferroic materials with properties that are scientifically appealing and technologically useful. In practical terms, this involves the construction of fine period superlattices composed of titanate and manganite perovskite oxides using an off-axis RF magnetron sputtering technique. X-ray diffraction (both lab and synchrotron based), atomic force microscopy, transmission electron microscopy, and electrical techniques are then used to explore the fundamental physics of the artificial materials. Special emphasis is placed on phase transitions and phenomena related to domains. The wide variety of experimental techniques used in the project provides a team of graduate, undergraduate and high school students with hands-on experience with cutting-edge research techniques and facilities.This grant is co-funded by the Office of International Science and Engineering (OISE)'s Europe and Eurasia Program.

非技术描述：该实验项目的重点是开发具有工程电气和磁性特性的新型人工层状材料。借助 PI 实验室中最先进的沉积设施，可以在原子尺度上控制所制造材料中的堆叠层的厚度。这些层状结构中界面的高度完善使得组成材料之间能够产生新的相互作用，其结果是新颖的行为，这可能成为许多关键设备应用（例如非易失性计算机存储器、传感器、执行器和能量采集器）性能改进的基础。 PI 实验室和布鲁克海文国家实验室用户设施中的一套尖端实验工具被用来探索新材料的物理特性，并建立对其优化所需的理解。所使用技术的广泛性为进行研究的学生提供了长期的培训益处。与研究计划紧密结合的是一项教育推广计划，围绕一套独特且引人入胜的教学套件的开发和传播而建立。为了实现多样性目标，主要是通过利用石溪大学极其多样化的学生社区和现有的教育推广项目来做出具体的努力。技术细节：钙钛矿氧化物是人造材料的理想“构建块”，因为在相对相似的晶体结构中，它们具有各种复杂的结构扭曲和相关的功能特性。该项目感兴趣的关键材料是铁性（铁电、铁磁或铁弹性）或多铁性（在同一材料中表现出两种或多种铁性的组合）。最近，氧化物材料中出现了一些令人惊讶的例子，其中通过仔细控制界面来实现与本体材料特性明显不同的行为。该研究的核心概念是利用界面相互作用以及应变和静电来构建具有科学吸引力和技术实用性的新型铁质材料。 实际上，这涉及使用离轴射频磁控溅射技术构建由钛酸盐和锰钙钛矿氧化物组成的细周期超晶格。然后使用 X 射线衍射（基于实验室和同步加速器）、原子力显微镜、透射电子显微镜和电气技术来探索人造材料的基础物理学。特别强调相变和与域相关的现象。 该项目中使用的各种实验技术为研究生、本科生和高中生团队提供了尖端研究技术和设施的实践经验。这笔赠款由国际科学与工程办公室 (OISE) 的欧洲和欧亚计划共同资助。