Improving Inductive Sensing of Superparamagnetic Nanoparticles Through Orientation of Easy Axes
(2025) Proceedings of IEEE Sensors — Location: Vancouver, Canada (19.October.2025)
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- Magnetic nanoparticles are being actively explored for diagnostic use in inductive biosensors, due to their high susceptibility and low hysteresis. In this work, we demonstrate how drying particles under a DC magnetic field within a membrane substrate affects sensitivity of the sensing platform. When the nanoparticles (Fe3O4, CoFe2O4, MnFe2O4) are dried within a static magnetic field parallel to the inductive AC sensing field, the sensor response is increased by 6 to 16 % depending on sample alloy and mass. Furthermore, when the drying field and excitation field are orthogonal, the signal is decreased by similar factors. The results point to a Brownian rotation of the particles during the drying process. Index Terms—superparamagnetic nanoparticles, inductive sensing, anisotropy constants, magnetic biosensors, easy axis
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Hauwaert, M., Trifiro, N., Pilati, V., Lejeune, L., Spassov, S., Lefebvre, M., Moumneh, R., Hermans, S., Rivas, M., & Raskin, J.-P. (2025, October 19). Improving Inductive Sensing of Superparamagnetic Nanoparticles Through Orientation of Easy Axes. IEEE Sensors. Proceedings. Published. Proceedings of IEEE Sensors, Vancouver, Canada. https://doi.org/10.1109/SENSORS59705.2025.11330555 (Original work published 2025)