发表机构
The University of Texas at Austin; National Yang-Ming Chiao-Tung University（德克萨斯大学奥斯汀分校; 国立阳明交通大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用含NV色心的纳米金刚石作为量子传感器，定量测量CoFeB条带畴反转时的杂散磁场，通过微磁模拟解释边缘正跳变、外侧负跳变及中心无变化，并提出全约束拟合方法，实现高空间分辨的磁场表征。
AI 中文摘要
定量测量畴反转过程中的纳米尺度杂散磁场对于理解和优化磁性存储及逻辑器件至关重要。然而，使用微创探针实现高空间分辨率仍然具有挑战性。在此，我们展示了含有氮空位（NV）色心集合的纳米金刚石（NDs）作为CoFeB条带中畴反转杂散场的局部量子传感器。在磁场驱动的反转过程中，ND传感器根据其相对于条带的位置分辨出三种不同的局部响应：边缘处的正频率跳变、条带外侧意外的负跳变以及中心附近的微小变化。这些对比鲜明的信号通过微磁模拟中的静磁边界场得到了定量解释。我们进一步实现了一种完全约束的光探测磁共振谱拟合程序，即使在共振部分分辨的情况下也能实现稳健的场提取。总之，这些结果确立了NV-ND磁力测定法作为一种简单、可转移且定量的方法，用于表征薄膜和自旋电子器件中空间异质磁场。
英文摘要
Quantitative measurement of nanoscale stray magnetic fields during domain reversal is important for understanding and optimizing magnetic memory and logic devices. Yet, achieving high spatial resolution with minimally invasive probes remains challenging. Here we demonstrate nanodiamonds (NDs) hosting an ensemble nitrogen vacancy (NV) centers as local quantum sensors of domain-reversal stray fields in a CoFeB strip. During magnetic-field-driven reversal, the ND sensors resolve three distinct local responses depending on their positions relative to the strip: a positive frequency jump at the edge, an unexpected negative jump just outside the strip, and a negligible change near the center. These contrasting signals are quantitatively explained by magnetostatic boundary fields from micromagnetic simulations. We further implement a fully constrained fitting procedure for optically detected magnetic resonance spectra, enabling robust field extraction even when resonances are partially resolved. Together, these results establish NV-ND magnetometry as a simple, transferable, and quantitative approach for characterizing spatially heterogeneous magnetic fields in thin-films and spintronic devices.
Journal refNano Lett. 26, 12527 (2026)
DOI：10.1021/acs.nanolett.6c03535
