Spatiotemporal imaging of microwave magnetic fields via magnonic coherent splitting

C. K. Wei; Z. J. Chen; J. T. Song; S. H. Ma; W. H. Liu; J. H. Wu; Z. W. Huang; Jinwei Rao; Wei Lu; Bimu Yao

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arXiv · 2610.04618

Spatiotemporal imaging of microwave magnetic fields via magnonic coherent splitting

C. K. Wei·Z. J. Chen·J. T. Song·S. H. Ma·W. H. Liu·J. H. Wu·Z. W. Huang·Jinwei Rao·Wei Lu·Bimu Yao

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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/$\sqrt{\mathrm{Hz}}$ 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.

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C. K. Wei, Z. J. Chen, J. T. Song, S. H. Ma, W. H. Liu, J. H. Wu, Z. W. Huang, Jinwei Rao, Wei Lu, Bimu Yao. 2026-10-03. Spatiotemporal imaging of microwave magnetic fields via magnonic coherent splitting. https://arxiv.org/abs/2610.04618

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