CAREER: Ferroelectric and magneto-electric dynamics in multiferroics driven by intense terahertz pulses

职业：强太赫兹脉冲驱动的多铁性材料中的铁电和磁电动力学

基本信息

批准号：
1554866
负责人：
Diyar Talbayev
金额：
$ 57.95万
依托单位：
Tulane University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-03-01 至 2022-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1554866&HistoricalAwards=false
关键词：
CAREER Ferroelectric magneto electric dynamics

项目摘要

Non-technical Abstract: A compass needle shares an important property with the data-storage layer on your computer's hard drive - they are both magnetized, or ferromagnetic. Another property of matter that allows data storage is ferroelectric polarization. This research explores how materials that are both ferroelectric and ferromagnetic respond to intense terahertz-frequency electric fields. The goal is to establish the physics of the materials interaction with the terahertz electric field. One terahertz frequency is more than one hundred times faster than your computer processor speed. Thus, this research potentially enables much faster data writing and storage functionality compared with the technologies available today. This project also aims to educate the next generation of scientists and engineers and to broaden the participation of women and under-represented minorities in sciences. The planned activities enhance the Tulane Science Scholar Program, whose goal is to attract high school students with exceptional promise in science and mathematics into engineering disciplines. The participation of underrepresented minorities in science and engineering is promoted through summer undergraduate student research with participants recruited from local Historically Black Colleges and Universities (HBCUs) in New Orleans on paid summer assistantships. The participation of women in sciences is promoted by the GIST (Girls in STEM at Tulane) program that provides middle-school girls with the opportunity to meet and work with women role models in science. Technical Abstract: This project targets a new frontier in technologically advanced ferroelectrics and multiferroics by focusing on ferroelectric and magnetoelectric dynamics driven by intense terahertz pulses, where both spin and lattice are resonantly excited. The goal is to discover the new physics that emerges when the coupled spin and lattice motion is coherently driven in the very large amplitude regime. It is hypothesized that the terahertz-driven dynamic ferroelectric and magnetic responses can approach in magnitude the responses induced by static electric fields and allow domain manipulation. Terahertz pulses with peak electric field exceeding 100 kV/cm are used to coherently excite the large-amplitude ionic motion along the ferroelectric phonon coordinates. The spin dynamics is excited via the magneto-electric coupling of spin to the lattice motion. The response of the order parameters is probed using terahertz and optical probe pulses. This work aims to create new knowledge of the nonequilibrium response of matter to intense terahertz pulses and to provide guidance for the design of future terahertz-frequency magneto-electric and data storage devices.

非技术摘要：指南针与计算机硬盘上的数据存储层共享一个重要的属性 - 它们既被磁化或铁磁。允许数据存储的物质的另一个属性是铁电偏振。这项研究探讨了铁电和铁磁性的材料如何应对强烈的Terahertz频场电场。目的是建立与Terahertz电场相互作用的物理学。一个Terahertz频率比您的计算机处理器速度快一百多倍。因此，与当今可用的技术相比，这项研究有可能使数据编写和存储功能更快。该项目还旨在教育下一代的科学家和工程师，并扩大妇女和代表性不足的少数群体的参与。计划中的活动增强了图兰科学者计划，其目标是吸引具有科学和数学方面卓越希望的高中学生进入工程学科。通过夏季本科生的研究促进了代表性不足的少数民族参与科学和工程学的参与，并从新奥尔良的当地历史悠久的黑人学院和大学（HBCUS）招募的参与者从事带薪夏季助学金。妇女参与科学的参与是由GIST（Tem in Tulane in Tulane）计划促进的，该计划为中学女孩提供了与科学领域的女性榜样见面和合作的机会。技术摘要：该项目针对技术先进的铁电和多效率的新领域，通过重点关注由强烈的Terahertz脉冲驱动的铁电和磁电力动力学，在该动力学中，旋转和晶格都令人振奋。目的是发现当耦合旋转和晶格运动在非常大的振幅方向上连贯驱动时出现的新物理学。假设Terahertz驱动的动态铁电和磁反应可以接近静态电场引起的响应并允许域操作。具有超过100 kV/cm的峰值电场的Terahertz脉冲可连贯地激发沿铁电声子坐标的大振幅离子运动。自旋动力学通过自旋与晶格运动的磁电耦合激发。使用Terahertz和光学探针脉冲探测顺序参数的响应。这项工作旨在创建有关物质对强烈Terahertz脉冲的非平衡响应的新知识，并为未来的Terahertz频率磁电磁和数据存储设备的设计提供指导。