Room Temperature Single Phase Magnetoelectric Ceramics Based on Cation Engineered Hexaferrite Structures

基于阳离子工程六角铁氧体结构的室温单相磁电陶瓷

• 批准号: 1002543
• 负责人: Carmine Vittoria
• 金额: $ 50万
• 依托单位: Northeastern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1002543&HistoricalAwards=false
• 关键词: Room; Temperature; Single; Phase; Magnetoelectric

NON-TECHNICAL DESCRIPTION: The realization of single phase materials exhibiting a strong magnetoelectric effect will enable a wide variety of practical and advanced magnetoelectronic devices used in: wireless communication, radar, and sensing; storage, manipulation, and transmission of large data packets; and in building the framework for a new generation of multifunctional electronics that promises to impact a broad range of commercial and electronic systems and platforms. The project could lead to commercial payoffs, anticipated to be disruptive to existing global electronic markets ensuring U.S. companies early entry market share and significant job creation. The successful implementation of the project will significantly and positively impact society's science and technology (S&T) communities, as well as address important socio-economic challenges related to increasing the number of underrepresented minorities in science, technology, engineering and mathematics (STEM) disciplines. The project's education and outreach goals are designed to address opportunities in establishing and implementing the STEM value pipeline. These goals are two-fold: i) to identify, recruit, retain, and educate students at the high school/middle school, undergraduate, and graduate levels in the fundamentals and applied aspects of magnetism, materials and technologies, and ii) to increase the number of underrepresented minorities in the science and engineering professions, and in particular, in the magnetic materials and technology communities. The project's specific broader impact activities include the establishing of the Summer Science Magnetism Camp for rising 5th, 6th, 7th, and 8th grade middle school students of the Roxbury Preparatory Charter School of Boston: A middle school having an overwhelming minority population (nearly 100%). This project addresses one aspect of the STEM value pipeline often overlooked, that is, the identification, recruitment and education of pre-high school students for careers in science and engineering.TECHNICAL DETAILS: All single phase magnetoelectric materials reported to date function at cryogenic temperatures and/or very high magnetic fields severely limiting their utility. This research holds the potential of realizing practical materials that could be operated at room temperature and with minimal magnetic bias fields. Specifically, helical Y-type hexaferrite systems, including Ba2-xSrxZn2Fe12O22 and Ba2Zn2-xMgxFe12O22, have been shown to possess magnetoelectric properties, albeit at low temperatures (~5 K) or under high H-fields (~10 kOe). In prior NSF-funded research, these PIs have demonstrated the ability to re-distribute cations among unit cell sublattices in ferrite materials by employing the alternating target laser ablation deposition technique. As a result, substantial enhancement of microwave and magnetic properties, such as increased saturation magnetization, magnetic anisotropy and Néel temperature, has been demonstrated. Ab-initio electronic structure studies where used to guide the experimental research and to identify preferred sites for tailoring specific properties. This methodology, of targeted cation engineering, holds great promise for increasing the ferroelectric ordering temperature and reducing applied field requirements in hexaferrites. Combined with in-depth cation distribution studies, this research will yield new insights in effectively building the fundamental knowledge base of the magnetoelectric effect and it's potential applications. The project's broader impact activities include the establishment of the Summer Science Magnetism Camp for rising 5th, 6th, 7th, and 8th grade middle school students of the Roxbury Preparatory Charter School of Boston. Additionally, graduate students will participate in all aspects of this project that will include first principles density functional theory, state-of-the-art thin film processing, and the application of advanced synchrotron radiation tools to predict and confirm cation unit cell distribution while introducing them to first hand experience at world leading national laboratories.

非技术描述：表现出强磁电效应的单相材料的实现将使各种实用和先进的磁电子器件能够用于：无线通信，雷达和传感;存储，操纵和大数据包的传输;以及构建新一代多功能电子器件的框架，该框架有望影响广泛的商业和电子系统和平台。该项目可能会带来商业回报，预计将对现有的全球电子市场造成破坏，确保美国公司尽早进入市场份额并创造大量就业机会。该项目的成功实施将对社会的科学和技术界产生重大和积极的影响，并解决与增加科学、技术、工程和数学学科中代表性不足的少数群体人数有关的重要社会经济挑战。该项目的教育和外联目标旨在解决建立和实施STEM价值管道的机会。这些目标有两个方面：i）在高中/初中、本科和研究生阶段，在磁性、材料和技术的基础和应用方面，识别、招聘、留住和教育学生，ii）增加科学和工程专业，特别是磁性材料和技术社区中代表性不足的少数群体的数量。该项目的具体更广泛的影响活动包括为波士顿罗克斯伯里预备特许学校的五年级、六年级、七年级和八年级的中学生建立夏季科学磁学夏令营：这所中学拥有压倒性的少数民族人口（近100%）。该项目解决了STEM价值管道中经常被忽视的一个方面，即识别、招聘和教育高中前学生从事科学和工程职业。技术问题：迄今为止报道的所有单相磁电材料都在低温和/或非常高的磁场下工作，严重限制了它们的实用性。这项研究具有实现可在室温下操作且具有最小磁偏置场的实用材料的潜力。特别是，螺旋Y型六角铁氧体系统，包括Ba 2-xSrxZn 2Fe 12 O22和Ba 2 Zn 2-xMgxFe 12 O22，已被证明具有磁电性能，尽管在低温（~5 K）或高H场（~10 kOe）下。 在之前NSF资助的研究中，这些PI已经证明了通过采用交替靶激光烧蚀沉积技术在铁氧体材料中的晶胞亚晶格中重新分布阳离子的能力。结果，微波和磁性能的显著增强，例如增加的饱和磁化强度、磁各向异性和Néel温度，已经被证明。从头算电子结构研究用于指导实验研究和确定定制特定性能的首选位置。这种方法，有针对性的阳离子工程，具有很大的希望，提高铁电有序温度和降低所施加的磁场要求在六角铁氧体。结合深入的阳离子分布研究，这项研究将产生新的见解，有效地建立磁电效应及其潜在应用的基础知识库。该项目更广泛的影响活动包括为波士顿罗克斯伯里预备特许学校的五年级、六年级、七年级和八年级中学生建立夏季科学磁学夏令营。此外，研究生将参与该项目的各个方面，包括第一原理密度泛函理论，最先进的薄膜加工，以及先进的同步辐射工具的应用，以预测和确认阳离子晶胞分布，同时向他们介绍世界领先的国家实验室的第一手经验。