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The Performance of the Magneto-Impedance Effect for the Detection of Superparamagnetic Particles

The performance of magneto-impedance sensors to detect the presence and concentration of magnetic nanoparticles is investigated, using finite element calculations to directly solve Maxwell’s equations. In the case of superparamagnetic particles that are not sufficiently magnetized by an external fie...

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Autor principal: García-Arribas, Alfredo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181250/
https://www.ncbi.nlm.nih.gov/pubmed/32244423
http://dx.doi.org/10.3390/s20071961
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author García-Arribas, Alfredo
author_facet García-Arribas, Alfredo
author_sort García-Arribas, Alfredo
collection PubMed
description The performance of magneto-impedance sensors to detect the presence and concentration of magnetic nanoparticles is investigated, using finite element calculations to directly solve Maxwell’s equations. In the case of superparamagnetic particles that are not sufficiently magnetized by an external field, it is assumed that the sensitivity of the magneto-impedance sensor to the presence of magnetic nanoparticles comes from the influence of their magnetic permeability on the sensor impedance, and not from the stray magnetic field that the particles produce. The results obtained not only justify this hypothesis, but also provide an explanation for the discrepancies found in the literature about the response of magneto-impedance sensors to the presence of magnetic nanoparticles, where some authors report an increasing magneto-impedance signal when the concentration of magnetic nanoparticles is increased, while others report a decreasing tendency. Additionally, it is demonstrated that sensors with lower magneto-impedance response display larger sensitivities to the presence of magnetic nanoparticles, indicating that the use of plain, nonmagnetic conductors as sensing materials can be beneficial, at least in the case of superparamagnetic particles insufficiently magnetized in an external magnetic field.
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spelling pubmed-71812502020-04-28 The Performance of the Magneto-Impedance Effect for the Detection of Superparamagnetic Particles García-Arribas, Alfredo Sensors (Basel) Article The performance of magneto-impedance sensors to detect the presence and concentration of magnetic nanoparticles is investigated, using finite element calculations to directly solve Maxwell’s equations. In the case of superparamagnetic particles that are not sufficiently magnetized by an external field, it is assumed that the sensitivity of the magneto-impedance sensor to the presence of magnetic nanoparticles comes from the influence of their magnetic permeability on the sensor impedance, and not from the stray magnetic field that the particles produce. The results obtained not only justify this hypothesis, but also provide an explanation for the discrepancies found in the literature about the response of magneto-impedance sensors to the presence of magnetic nanoparticles, where some authors report an increasing magneto-impedance signal when the concentration of magnetic nanoparticles is increased, while others report a decreasing tendency. Additionally, it is demonstrated that sensors with lower magneto-impedance response display larger sensitivities to the presence of magnetic nanoparticles, indicating that the use of plain, nonmagnetic conductors as sensing materials can be beneficial, at least in the case of superparamagnetic particles insufficiently magnetized in an external magnetic field. MDPI 2020-03-31 /pmc/articles/PMC7181250/ /pubmed/32244423 http://dx.doi.org/10.3390/s20071961 Text en © 2020 by the author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
García-Arribas, Alfredo
The Performance of the Magneto-Impedance Effect for the Detection of Superparamagnetic Particles
title The Performance of the Magneto-Impedance Effect for the Detection of Superparamagnetic Particles
title_full The Performance of the Magneto-Impedance Effect for the Detection of Superparamagnetic Particles
title_fullStr The Performance of the Magneto-Impedance Effect for the Detection of Superparamagnetic Particles
title_full_unstemmed The Performance of the Magneto-Impedance Effect for the Detection of Superparamagnetic Particles
title_short The Performance of the Magneto-Impedance Effect for the Detection of Superparamagnetic Particles
title_sort performance of the magneto-impedance effect for the detection of superparamagnetic particles
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7181250/
https://www.ncbi.nlm.nih.gov/pubmed/32244423
http://dx.doi.org/10.3390/s20071961
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