发表机构
State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences; School of Physical Science and Technology, ShanghaiTech University; School of Physics, Shandong University（中国科学院上海技术物理研究所红外物理国家重点实验室; 上海科技大学物理科学与技术学院; 山东大学物理学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出基于磁振子相干劈裂的微波磁场时空成像方法，实现无光学、室温下高灵敏（58 pT/√Hz）及130纳秒响应的场分布重建，并验证了其在器件故障检测中的应用。
AI 中文摘要
时空微波磁场成像能够揭示高频电路中的电流流动和非平衡自旋动力学，然而现有探针很少能在室温下同时具备校准光谱读出、无光学操作和瞬态映射能力。本研究中，钇铁石榴石中的亚铁磁有序支持泵浦诱导磁振子模式的相干耦合，将目标场幅度转换为具有全微波读出的光谱劈裂。对校准后的劈裂随位置和延迟进行采样，可重建磁场的时空成像。连续波测量达到58 pT/√Hz的灵敏度，并能在不同功率下恢复相位。结合时间分辨频率梳光谱，该方法以130纳秒的响应时间重建瞬态场。共面波导成像验证了模式劈裂读出的磁选择性，测量图谱与模拟磁场分布一致。在微波放大器中，我们的重建解析了非均匀开关动力学，并检测到由开路接触故障引起的下游场抑制。磁振子相干劈裂为功能器件中时空场演化的无光学成像提供了一条可扩展的路径。
英文摘要
Spatiotemporal microwave magnetic-field imaging reveals current flow in high-frequency circuits and nonequilibrium spin dynamics, yet probes rarely combine calibrated spectral readout, optics-free operation and transient mapping at room temperature. Here ferrimagnetic order in yttrium iron garnet supports coherent coupling from a pump-induced magnon mode, converting target-field amplitude into a spectral splitting with all-microwave readout. Sampling the calibrated splitting over position and delay reconstructs spatiotemporal imaging of magnetic fields. Continuous-wave measurement reaches a sensitivity of 58 pT/$\sqrt{\mathrm{Hz}}$ and recovers phases across various powers. Combined with time-resolved frequency-comb spectroscopy, the method reconstructs transient fields with a 130-ns response time. Coplanar-waveguide imaging validates the magnetic selectivity of the mode-splitting readout, where measured maps agree with simulated magnetic-field distribution. In a microwave amplifier, our reconstruction resolves nonuniform switching dynamics and detects downstream field suppression from an open-contact fault. Magnonic coherent splitting provides a scalable route for optics-free imaging of spatiotemporal field evolution in functional devices.
Comments8 pages, 4 figures
