AI 中文总结
本研究通过微磁学模拟系统研究了单层和多层菱形纳米磁体的静态与动态磁行为，发现多层结构因增强的偶极耦合而具有更大的频率可调性（3 GHz），为可重构微波器件提供了新途径。
AI 中文摘要
菱形纳米磁体为开发具有可重构特性的微波器件提供了合适的平台。本研究利用微磁学模拟，系统研究了单层和多层菱形纳米磁体的静态和动态磁行为。通过简单的磁场初始化过程，获得了两种不同的剩磁构型。这些构型表现出不同的磁化图案和动态响应。通过施加纳秒级磁场脉冲，可以修改其共振特性，从而实现可重构的微波操作。对于单层结构，观察到亚GHz（0.9 GHz）范围内的明显共振频率偏移，而多层结构在GHz范围（3 GHz）内表现出显著更大的频率偏移。多层构型中观察到的较大频率可调性主要源于垂直耦合磁层之间增强的偶极耦合，这改变了局部有效磁场，并因此影响磁化动力学。这些发现表明，菱形纳米磁体可以为可重构微波功能提供一条简单有效的途径，在超低功耗、超快和频率可调的微波器件中具有潜在应用。
英文摘要
Diamond-shaped nanomagnets provide a suitable platform for developing microwave devices with reconfigurable characteristics. In this study, the static and dynamic magnetic behaviour of single layer and multilayer diamond-shaped nanomagnets was systematically investigated using micromagnetic simulations. Two distinct remanent magnetic configurations were obtained through a simple magnetic field initialization process. These configurations exhibited different magnetization patterns and dynamic responses. Their resonance characteristics could be modified by applying a nanosecond-scale magnetic field pulse, enabling reconfigurable microwave operation. A clear resonance frequency shift in the sub-GHz (0.9 GHz) range was observed for the single-layer structure, while the multilayer structure exhibited a significantly larger frequency shift in the GHz range (3 GHz). The larger frequency tunability observed in the multilayer configuration arises primarily from the enhanced dipolar coupling between the vertically coupled magnetic layers, which modifies the local effective magnetic field and consequently influences the magnetization dynamics. These findings demonstrate that diamond-shaped nanomagnets can provide a simple and effective route toward reconfigurable microwave functionality, with potential applications in ultralow-power, ultrafast, and frequency tunable microwave devices.
Comments28 pages and 8 figures
