AI 中文总结
研究高分辨率扫描 SQUID 显微镜探头的空间分辨率和点扩散函数，通过模拟磁通量耦合给出 SOL PSF 的数学描述，利用单个磁斯格明子测量真实 SOL 磁通量响应，证实计算出的 PSF 和空间分辨率。
AI 中文摘要
超导量子干涉器件（SQUIDs）对磁通量表现出极高的灵敏度。在扫描 SQUID 显微镜（SSM）中，SQUID 尺寸及其与样品的距离被最小化，以实现最佳空间分辨率的弱磁场映射。杠杆式 SQUID（SOL）架构因其传感器尺寸小、坚固性以及易于与传统原子力显微镜硬件集成，已被证明是特别有效的 SSM 探头。为了优化使用 SOL 探头进行的磁显微镜检测并准确重建其测量的磁场，了解其点扩散函数（PSF）至关重要。通过模拟与磁通量源的耦合，这项工作提供了 SOL PSF 的数学描述，包括探头磁灵敏度和空间分辨率的完整描述。然后，使用单个磁斯格明子的测量来测量真实 SOL 的磁通量响应。结果表明与模拟得到的通量响应高度吻合，从而证实了计算出的 PSF 和空间分辨率。
英文摘要
Superconducting quantum interference devices (SQUIDs) show exceptional sensitivity to magnetic flux. In scanning SQUID microscopy (SSM), SQUID size and its distance to the sample are minimized in order to map weak magnetic fields with best possible spatial resolution. SQUID-on-lever (SOL) architectures have proven especially effective as SSM probes due to their small sensor size, robustness, and ease of integration with conventional atomic force microscopy hardware. In order to optimize magnetic microscopy carried out with SOL probes and to accurately reconstruct the magnetic fields that they measure, it is essential to know their point spread function (PSF). The size and shape of this PSF are determined by magnetic flux focusing effects, which depend on the characteristic length-scales of the superconductor and the sensor geometry. By simulating the coupling to sources of magnetic flux, this work provides a mathematical description of the SOL PSF, which contains a full description of the probe's magnetic sensitivity and spatial resolution. We then use measurements of a single magnetic skyrmion to measure the magnetic flux response of a real SOL. We demonstrate excellent agreement with flux responses that are obtained from simulations, thereby confirming the calculated PSF and spatial resolution.
Comments12 pages, 9 figures
