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Magnetization Dynamics at Nanoscale

纳米级磁化动力学

基本信息

批准号：
1614948
负责人：
Cyrill Muratov
金额：
$ 36万
依托单位：
New Jersey Institute of Technology
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-07-01 至 2020-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1614948&HistoricalAwards=false
关键词：
Magnetization Dynamics Nanoscale

项目摘要

This research project investigates questions in the area of magnetic materials, emphasizing modeling, analysis, and numerical explorations of nanoscale systems. Magnetic materials have been an indispensable ingredient for information storage since the advent of the computer age and presently hold great promise for the development of revolutionary new computer and information technologies. Recent advances in nanofabrication allow an unprecedented precision in building magnetic multilayer structures, using ultrathin films with thickness down to a single atomic layer and a lateral extent down to ten nanometers. At these very small scales, new physical effects become prominent, driving interesting new phenomena such as spin transfer torque, chiral domain walls, magnetic skyrmions, spin, inverse spin, and topological Hall effects. This new physics needs to be incorporated into the micromagnetic modeling framework that proved very successful in the previous studies of magnetic systems at larger scales. This research project explores the multiscale, nonlinear, nonlocal, and often stochastic nature of the new models, which represents a significant challenge to understanding and predicting the behavior of such systems. A key component of the project is the involvement of a new generation of applied mathematicians in this highly interdisciplinary area of research.This project aims to formulate and analyze models of ultrathin ferromagnetic films in the presence of antisymmetric exchange interaction, which produces a non-trivial interplay with the topological characteristics of the magnetization. Particular care will be taken to incorporate into the models the non-local effects of the stray field via rigorous analysis of the appropriate asymptotic thin film limits arising from the full three-dimensional treatment. Within the obtained reduced thin film models, the properties of charged domain walls, chiral domain walls, and magnetic skyrmions will be investigated, using a combination of analytical, formal asymptotic, and numerical tools. The questions of existence and asymptotic properties of these coherent structures give rise to challenging problems of energy-driven pattern formation and calculus of variations. The research is strongly motivated by the rapidly expanding field of spintronics. All the special magnetization configurations that will be considered in the project are currently targets for potential applications in spintronics devices and, in particular, for the development of non-volatile sequential and random access computer memories.

本研究计画探讨磁性材料领域的问题，强调奈米系统的模拟、分析与数值探索。自计算机时代到来以来，磁性材料一直是信息存储不可或缺的成分，并且目前为革命性的新计算机和信息技术的发展带来了巨大的希望。纳米纤维的最新进展允许在构建磁性多层结构方面具有前所未有的精度，使用厚度低至单个原子层且横向范围低至10纳米的纳米纤维膜。在这些非常小的尺度上，新的物理效应变得突出，驱动有趣的新现象，如自旋转移力矩，手征畴壁，磁skyrmion，自旋，逆自旋和拓扑霍尔效应。这种新的物理需要纳入微磁建模框架，证明了在以前的研究中非常成功的磁系统在更大的尺度。该研究项目探讨了新模型的多尺度，非线性，非局部和随机性质，这对理解和预测此类系统的行为构成了重大挑战。该项目的一个关键组成部分是新一代应用数学家参与这一高度跨学科的研究领域。该项目旨在制定和分析在反对称交换相互作用存在下的铁磁薄膜模型，该模型与磁化的拓扑特征产生了非平凡的相互作用。将特别注意纳入模型的杂散场的非局部效应，通过严格分析的适当的渐近薄膜的限制所产生的完整的三维治疗。在所获得的减少薄膜模型，带电畴壁，手征畴壁，和磁skyrmions的属性将进行调查，使用分析，正式渐近，和数值工具的组合。这些相干结构的存在性和渐近性质的问题引起了具有挑战性的问题，能量驱动的模式形成和变分法。这项研究受到自旋电子学领域迅速发展的强烈推动。所有的特殊磁化配置，将在该项目中考虑的自旋电子器件，特别是非易失性顺序和随机存取计算机存储器的发展，目前的潜在应用的目标。