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属性 - 它们都是磁化的或铁磁性的。允许数据存储的物质的另一个特性是铁电极化。这项研究探讨了铁电和铁磁材料如何响应强烈的太赫兹频率电场。目标是建立材料与太赫兹电场相互作用的物理原理。 1 太赫兹频率比计算机处理器速度快一百倍以上。因此，与当今可用的技术相比，这项研究有可能实现更快的数据写入和存储功能。该项目还旨在教育下一代科学家和工程师，并扩大妇女和代表性不足的少数群体对科学的参与。计划中的活动加强了杜兰大学科学学者计划，其目标是吸引在科学和数学方面具有特殊潜力的高中生进入工程学科。通过暑期本科生研究，以带薪暑期助学金从新奥尔良当地历史黑人学院和大学（HBCU）招募参与者，促进代表性不足的少数族裔参与科学和工程领域。 GIST（杜兰大学 STEM 女孩）计划促进女性参与科学，该计划为中学生提供与科学界女性榜样会面和合作的机会。技术摘要：该项目的目标是技术先进的铁电体和多铁性材料的新前沿，重点关注强太赫兹脉冲驱动的铁电和磁电动力学，其中自旋和晶格都被共振激发。目标是发现当耦合自旋和晶格运动在非常大幅度的状态下相干驱动时出现的新物理现象。据推测，太赫兹驱动的动态铁电和磁响应可以在幅度上接近静电场引起的响应，并允许域操纵。峰值电场超过 100 kV/cm 的太赫兹脉冲用于沿铁电声子坐标相干地激发大幅度离子运动。自旋动力学是通过自旋与晶格运动的磁电耦合来激发的。使用太赫兹和光学探测脉冲来探测阶次参数的响应。这项工作旨在创造关于物质对强太赫兹脉冲的非平衡响应的新知识，并为未来太赫兹频率磁电和数据存储设备的设计提供指导。