Nonlinear Vortex Dynamics in Superconductors with Anisotropic Pinning Nanostructures

具有各向异性钉扎纳米结构的超导体中的非线性涡动力学

• 批准号: 200044433
• 负责人: Privatdozent Dr. Oleksandr Dobrovolskiy
• 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: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/200044433?language=en
• 关键词: Nonlinear; Vortex; Dynamics; Superconductors; Anisotropic

The fabrication of uniaxial or bianisotropic pinning structures in thin films opens up a controlled pathway to govern the mixed-state resistive response of type-II superconductors with a perspective of using it for fluxonics applications, i. e. manipulating single vortices similar to electrons in nano- and microelectronics. Moreover, such films provide a model system with fully predictable properties within a state-of-the-art theoretical approach of describing the nonlinear vortex dynamics under the influence of anisotropic pinning. The deduction of anisotropic pinning potential parameters from resistivity data will allow for the first time to answer the following questions: In which frequency range is a harmonic generation most pronounced? How can one optimize special (bianisotropic and asymmetric-ratchet) nanostructures to provide the most suitable pinning potential characteristics for microwave device fabrication? Is there an interference effect between the Hall- and the ratchet-effect? In order to answer these questions an original rotating-current scheme will be used and special methods for asymmetric signal averaging be applied. The expected results are of interest not only for thin-film superconductors but they will be generic to all similar noise-mediated systems subjected to DC and AC current driving.

在薄膜中制造单轴或双轴性固定结构为控制II型超导体的混合态电阻响应打开了，并将其用于Fluxonics应用，i。 e。操纵与纳米和微电子中电子相似的单个涡旋。此外，此类电影提供了一个模型系统，具有完全可预测的属性，它在最先进的理论方法中描述了各向异性固定的影响下的非线性涡流动力学。从电阻率数据中扣除各向异性固定潜在参数将首次回答以下问题：哪个频率范围是最明显的谐波生成？如何优化特殊（Bianisotropic和不对称式）纳米结构以提供微波设备制造的最合适的潜在特征？霍尔和棘轮效应之间是否存在干扰效果？为了回答这些问题，将使用原始的旋转 - 电流方案，并采用平均非对称信号的特殊方法。预期的结果不仅对薄膜超导体引起了人们的关注，而且对于受到直流电和交流电流驾驶的所有类似噪声介导的系统，它们都将是通用的。