基于扫描NV磁力计的铁磁涡旋动力学的纳米级成像
Nanoscale imaging of ferromagnetic vortex dynamics with scanning NV magnetometry
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中文总结 AI 辅助
该研究利用扫描NV磁力计实现了约50 nm空间分辨率的铁磁涡旋静态场与微波场成像，揭示了无序对微波倏逝衰减的影响，其技术分辨率优于衍射极限技术，可用于磁子器件研发。
中文摘要 AI 辅助
通过磁涡旋在纳米尺度上产生和操控自旋波具有重要意义，因其在磁子和量子技术领域有广泛应用。此前，金刚石中的固定氮空位（NV）中心已被用于局域表征涡旋动力学，而扫描NV磁力计（SNVM）已被用于成像涡旋的静态杂散场。本文中，我们展示了SNVM对介尺度坡莫合金结构中涡旋产生的静态场和微波场的成像，空间分辨率约为50 nm，与微磁模拟结果吻合良好，同时揭示了无序的影响。我们进一步展示了涡旋核心附近40倍的微波场增强，并成像了这些微波的无序依赖、空间变化的倏逝衰减。我们的室温桌面技术超越了衍射极限技术的分辨率至少5倍，且比基于同步辐射的技术具有更高的可及性和通量，为磁子器件的研究与开发提供了新机遇。
英文摘要
The generation and manipulation of spin waves at the nanoscale via magnetic vortices are of considerable importance because of their broad applications across magnonic and quantum technologies. Previously, fixed nitrogen-vacancy (NV) centers in diamond have been used to locally characterize vortex dynamics, and scanning NV magnetometry (SNVM) has been used to image vortices' static stray fields. Here, we demonstrate SNVM imaging of both the static and microwave fields generated by vortices in mesoscopic permalloy structures with $\sim$50 nm spatial resolution, achieving excellent agreement with micromagnetic simulations, while revealing the effects of disorder. We further demonstrate a 40$\times$ microwave field enhancement near a vortex core and image the disorder-dependent, spatially varying, evanescent decay of these microwaves. Our ambient, tabletop technique surpasses diffraction-limited techniques' resolutions by at least 5$\times$, with far greater accessibility and throughput than synchrotron radiation-based techniques, offering new opportunities in the study and development of magnonic devices.
