Improving Inductive Sensing of Superparamagnetic Nanoparticles Through Orientation of Easy Axes

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Improving Inductive Sensing of Superparamagnetic Nanoparticles Through Orientation of Easy Axes

Conference Paper (2025)

Author(s)

Margo Hauwaert (Université Catholique de Louvain)

Nordin Trifiro (Université Catholique de Louvain)

Vanessa Pilati (Universidad de Oviedo)

Louise Lejeune (Université Catholique de Louvain)

Simo Spassov (IRM-KMI)

Martin Lefebvre (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Ramy Moumneh (Université Catholique de Louvain)

Sophie Hermans (Université Catholique de Louvain)

Montserrat Rivas (Universidad de Oviedo)

Jean Pierre Raskin (Université Catholique de Louvain)

Research Group

Electronic Instrumentation

Anisotropy constants Easy axis Inductive sensing Magnetic biosensors Superparamagnetic nanoparticles

DOI related publication

https://doi.org/10.1109/SENSORS59705.2025.11330555 Final published version

To reference this document use

https://resolver.tudelft.nl/uuid:2b5475bc-9532-4047-be58-1e80d4bf3d5e

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Publication Year

2025

Language

English

Research Group

Electronic Instrumentation

Publisher

IEEE

ISBN (print)

979-8-3315-4468-3

ISBN (electronic)

979-8-3315-4467-6

Event

2025 IEEE SENSORS (2025-10-19 - 2025-10-22), Vancouver, Canada

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Abstract

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.

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