In-situ Control of the Photon-Magnon Synchronized Mode in a Miniaturized Magnetometer

Yuting Shi; Xudong Wang; Yue Zhao; Lijun Yan; Bimu Yao; Shishen Yan; Lihui Bai; Jinwei Rao

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arXiv · 2610.36705

In-situ Control of the Photon-Magnon Synchronized Mode in a Miniaturized Magnetometer

Yuting Shi·Xudong Wang·Yue Zhao·Lijun Yan·Bimu Yao·Shishen Yan·Lihui Bai·Jinwei Rao

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Abstract

Photon-magnon synchronized modes (PMSMs) provide a route for magnetic-field sensing by exploiting their enhanced field responsivity due to cusp points (CPs). However, the previous PMSM magnetometer relies on bulky discrete components and lacks in situ control of photon-magnon interactions, limiting its integration and adaptability. Here, we demonstrate a miniaturized PMSM magnetometer integrated on a printed circuit board. A variable resistor is used to tune the photon-magnon coupling strength in situ. By adjusting the variable resistor, the electromagnetic boundary condition of the magnetometer is altered; hence, the reservoir-mediated photon-magnon interaction is changed. The coupling strength shows a non-monotonic dependence on the reflection coefficient adjusted by the variable resistor and reaches its minimum at the impedance matching condition. Furthermore, we develop a non-Hermitian model with standing-wave interference to describe the PMSM dispersion and derive the critical condition for CP formation. This work realizes a compact and tunable PMSM magnetometer and provides a pathway for controlling photon-magnon interactions in integrated magnetic sensing systems.

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Yuting Shi, Xudong Wang, Yue Zhao, Lijun Yan, Bimu Yao, Shishen Yan, Lihui Bai, Jinwei Rao. 2026-10-27. In-situ Control of the Photon-Magnon Synchronized Mode in a Miniaturized Magnetometer. https://arxiv.org/abs/2610.36705

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