Theory of multiferroic materials and their heterostructures

多铁性材料及其异质结构理论

基本信息

批准号：
RGPIN-2015-03938
负责人：
DeSousa, Rogério
金额：
$ 2.62万
依托单位：
University of Victoria
依托单位国家：
加拿大
项目类别：
Discovery Grants Program - Individual
财政年份：
2019
资助国家：
加拿大
起止时间：
2019-01-01 至 2020-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=686842
关键词：
Theory multiferroic materials their heterostructures

项目摘要

Materials with coupled electric, magnetic, and elastic properties are of great interest to science and technology, because they are able to connect effects that are usually independent of each other. Multiferroic materials are prime candidates for showing these couplings. They have coexisting ferroic (or antiferroic) orders such as ferromagnetism, ferroelectricity, and ferroelasticity. When these orders are coupled, an electric field is able to control magnetic and structural phases, and mechanical stress is able to affect magnetism and ferroelectricity. The "dream material" in multiferroic physics is a ferromagnet-ferroelectric at room temperature. Such a material does not yet exist, but its synthesis could enable the development of a new class of electronic devices, such as magnetic memories with electric-write and magnetic-read operations that have the speed and energy-efficiency required to integrate the hard drive with the processor in personal computers. This would revolutionize computer hardware with major impact in current technology. My research program is the first step towards transforming known materials into this "dream material". I am developing the theoretical tools to understand the coupling between different orders in multiferroic materials, and to determine their phase diagram as a function of strain and external electric and magnetic fields. My goal is to propose modifications to known materials and to combine different ones in heterostructures so that they are transformed into a state that is closer to the dream ferromagnet-ferroelectric at room temperature.**

具有耦合电气，磁性和弹性特性的材料对科学和技术引起了极大的兴趣，因为它们能够连接通常彼此独立的效果。多种材料是显示这些耦合的主要候选物。他们已经共存铁元（或抗抗心脏），例如铁磁性，铁电性和铁弹性。当这些顺序耦合时，电场能够控制磁性和结构相，机械应力能够影响磁性和铁电性。多效物理学中的“梦想材料”是在室温下的铁磁性 - 弗罗德电。这种材料尚不存在，但是它的合成可以使新的电子设备的开发，例如具有电动作用和磁性读取操作的磁性记忆，这些操作具有将硬盘与处理器集成到个人计算机中所需的速度和能源效率。这将彻底改变计算机硬件，并对当前技术产生重大影响。我的研究计划是将已知材料转化为“梦想材料”的第一步。我正在开发理论工具，以了解多效材料中不同顺序之间的耦合，并确定其相图作为应变以及外部电场和磁场的函数。我的目标是对已知材料进行修改，并在异质结构中结合不同的材料，以便将它们转变为在室温下更接近Dream Ferromagnet-Ferroelectric的状态。**