Spatiotemporal imaging of microwave magnetic fields via magnonic coherent splitting
Abstract
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/√(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.
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BibTeX
@misc{wei2026spatiotemporal,
title = {{Spatiotemporal imaging of microwave magnetic fields via magnonic coherent splitting}},
author = {C. K. Wei and Z. J. Chen and J. T. Song and S. H. Ma and W. H. Liu and J. H. Wu and Z. W. Huang and Jinwei Rao and Wei Lu and Bimu Yao},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.04618},
eprint = {2610.04618},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.04618},
}
RIS
TY - UNPB
TI - Spatiotemporal imaging of microwave magnetic fields via magnonic coherent splitting
AU - C. K. Wei
AU - Z. J. Chen
AU - J. T. Song
AU - S. H. Ma
AU - W. H. Liu
AU - J. H. Wu
AU - Z. W. Huang
AU - Jinwei Rao
AU - Wei Lu
AU - Bimu Yao
PY - 2026
DA - 2026/10/03
PB - arXiv
DO - 10.48550/arxiv.2610.04618
UR - https://arxiv.org/abs/2610.04618
AB - 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/√(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.
ER -