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Updated: Sep 13, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
Published on: June 9, 2016
Dual-frequency operation in a single atomic magnetometer and frequency-shift keying modulation of magnetic field
Abstract:
We present a dual-frequency operation technique for a radio-frequency atomic magnetometer utilizing a single natural-abundance rubidium (Rb) vapor cell for the first time, and demonstrate a proof-of-concept for magnetic field communication using binary frequency-shift keying (BFSK) under unshielded conditions. The two operational frequencies correspond to the Larmor frequencies of 85Rb and 87Rb, as determined by their distinct gyromagnetic ratios in the same magnetic field environment. A rate of 400 symbols/s is adeptly demonstrated with an ambient noise floor of < 20 pT/√Hz, attaining a signal-to-noise ratio of 20 dB. These findings highlight the efficacy of dual-frequency atomic magnetometry as a sophisticated and resilient technique for magnetic field communication in unshielded environments.
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