A superconducting quantum magnetometer based on magnetic flux-driven modulation of the density of states of a proximized metallic nanowire is theoretically analyzed. With optimized geometrical and material parameters transfer functions up to a few mV/Φ₀ and intrinsic flux noise ~10^-9Φ₀/√Hz below 1 K are achievable. The opportunity to access single-spin detection joined with limited dissipation (of the order of ~10^-14 W) make this magnetometer interesting for the investigation of the switching dynamics of molecules or individual magnetic nanoparticles.
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Giazotto et al. (2011) studied this question.