Engineering ferroelectric topologies in freestanding membranes

独立式膜中的铁电拓扑工程

• 批准号: DE220101185
• 负责人: Dr SUJIT DAS
• 金额: --
• 依托单位: The University of New South Wales
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Early Career Researcher Award
• 财政年份: 2022
• 资助国家: 澳大利亚
• 起止时间: 2022-06-01 至 2022-06-01
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DE220101185
• 关键词: Engineering; ferroelectric; topologies; freestanding; membranes

This DECRA proposal is focused on the exploiting controlled motion, annihilation and creation of real space topological defects (polar skyrmions, vortices and merons) in free-standing ferroelectric superlattices. Topological states in ferroic materials arise from spin/dipolar textures (the spins/dipoles can be considered as quasiparticles) which condense to form topological defects. The imposition of precisely controlled elastic boundary conditions through an applied bending stress, temperature profiles and electric fields to the membranes enables tailored functional responses without any interference from substrate clamping effect. This yields multifunctional materials with enhanced operational speed, sensitivity and energy-efficiencies.

DECRA的这一建议主要集中在利用独立铁电超晶格中真实的空间拓扑缺陷（极性skyrmions，涡旋和merons）的受控运动，湮灭和创建。铁性材料中的拓扑态来自自旋/偶极结构（自旋/偶极可以被认为是准粒子），其凝聚形成拓扑缺陷。通过对膜施加弯曲应力、温度分布和电场来施加精确控制的弹性边界条件，能够实现定制的功能响应，而不会受到衬底夹持效应的任何干扰。这产生了具有增强的操作速度、灵敏度和能量效率的多功能材料。