Weak Magnetic Sensing via Floquet Driving in an Active Cavity Magnon Coupled System
Fan Yang, Xudong Wang, Lijun Yan, Yue Zhao, Jinwei Rao + 2 more
TLDR
This paper presents a room-temperature, miniaturized weak magnetic field sensor using an active cavity-magnon system and Floquet driving.
Key contributions
- Developed a miniaturized, room-temperature weak magnetic field sensor using an active microwave cavity and YIG on PCBs.
- Introduced electrically tunable gain to compensate for cavity losses, boosting quality factor and signal intensity.
- Employed Floquet modulation to detect weak fields by driving a specific hybrid mode and measuring sidebands.
Why it matters
This work addresses the limitations of conventional weak magnetic field sensors by offering a compact, room-temperature solution. Its high sensitivity and PCB-based implementation open doors for practical applications in various fields.
Original Abstract
While significant advancements have been made in weak magnetic field detection, conventional high-sensitivity techniques are often limited by requirements for cryogenic operation or bulky setups. In this work, we develop a sensitive alternating magnetic field sensor based on a coupled system of an active microwave cavity and yttrium iron garnet (YIG), with the components implemented on printed circuit boards (PCBs). By introducing electrically tunable gain to compensate for cavity losses, we substantially improve both the quality factor and the signal intensity. Under the coupled system, Floquet modulation is induced by the alternating magnetic field, allowing for weak field detection by driving a specific hybrid mode and measuring the resulting Floquet sidebands. This miniaturized device operates at room temperature, achieving a detection limit of 121 pT/\sqrt{Hz}.
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