Curvature-induced effects in magnetic nanostructures

磁性纳米结构中的曲率诱导效应

• 批准号: 444929866
• 负责人: Professor Dr. Michael Huth
• 金额: --
• 依托单位: Fakultät für Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/444929866?language=en
• 关键词: Curvature; induced; effects; magnetic; nanostructures

Materials with chiral interactions possessing chiral magnetic textures are at the forefront of current condensed matter research. Curvature effects in geometrically curved magnetic thin films emerged as a viable alternative to conventional approaches towards the realization of chiral magnetic textures, which are based on tuning of intrinsic properties of materials. Although there are numerous appealing theoretical predictions of curvature-induced effects in 3D shells, the novel physics of exchange- and magnetostatic-driven phenomena in nanomagnetism are not yet explored experimentally. This is mainly due to the lack of characterization tools and fabrication methods which can provide access to complex geometries at the low micrometer and sub-µm scale, e.g. tori, Möbius strips, spherical shells. In this project we address these fundamentally relevant aspects. The main objective of this project is to join efforts of three experimental groups and one theory group to develop and exploit novel routes in fabrication of 3D curved magnetic shells at the low micrometer and sub-µm scale. In addition, we will fully characterize them and study their complex magnetic states and their dynamics both, experimentally and theoretically. In the focus will be mainly objects which were not realized before, including but not limited to torus, Möbius strip, and spherical shell. These new magnetic architectures will be characterized using a broad range of experimental techniques with respect to their static and dynamic properties. For the latter, new methods will be established and applied to study magnetization dynamics, e.g. in fundamentally appealing radially magnetized Swiss rolls. To understand complex magnetic structures in these architectures, advanced micromagnetic simulations will be carried out using finite element based micromagnetic solvers which are accelerated by the high parallel computing power of graphics cards. This project will not only deepen our understanding on curvature-induced effects in condensed matter but also will put novel theoretical concepts and proposals to the test by experiment. This will provide deepened insight into how curvature effects can be used for future realization of novel 3D devices.

具有手性磁性织构的手性相互作用材料是当前凝聚态研究的前沿。几何弯曲的磁性薄膜中的曲率效应作为实现手性磁性织构的传统方法的可行替代方案而出现，该方法基于材料的本征性质的调谐。虽然有许多吸引人的理论预测的曲率诱导的影响在3D壳，在纳米磁性的交换和静磁驱动的现象的新物理尚未实验探索。这主要是由于缺乏表征工具和制造方法，可以在低微米和亚微米尺度上获得复杂的几何形状，例如环面，莫比乌斯带，球壳。在这个项目中，我们解决这些基本相关的方面。该项目的主要目标是联合三个实验组和一个理论组的努力，开发和利用在低微米和亚微米尺度下制造3D弯曲磁性壳的新路线。此外，我们将充分表征它们，并从实验和理论上研究它们的复杂磁态及其动力学。重点将主要是以前没有实现的对象，包括但不限于环面，莫比乌斯带和球壳。这些新的磁性架构将使用广泛的实验技术对其静态和动态特性进行表征。对于后者，将建立新的方法并应用于研究磁化动力学，例如在根本上吸引人的径向磁化瑞士辊。为了理解这些架构中的复杂磁结构，将使用基于有限元的微磁解算器进行高级微磁模拟，这些解算器由图形卡的高并行计算能力加速。这个项目不仅将加深我们对凝聚态物质中曲率诱导效应的理解，而且将通过实验来检验新的理论概念和建议。这将为如何将曲率效应用于未来实现新型3D设备提供更深入的见解。