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    Magneto-Impedance Biosensor Sensitivity: Effect and Enhancement

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    Author
    Sayad, A; Skafidas, E; Kwan, P
    Date
    2020-09-01
    Source Title
    Sensors
    Publisher
    MDPI
    University of Melbourne Author/s
    Kwan, Patrick; Skafidas, Efstratios
    Affiliation
    Electrical and Electronic Engineering
    Medicine and Radiology
    Metadata
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    Document Type
    Journal Article
    Citations
    Sayad, A., Skafidas, E. & Kwan, P. (2020). Magneto-Impedance Biosensor Sensitivity: Effect and Enhancement. SENSORS, 20 (18), https://doi.org/10.3390/s20185213.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/251607
    DOI
    10.3390/s20185213
    Abstract
    Biosensors based on magneto-impedance (MI) effect are powerful tools for biomedical applications as they are highly sensitive, stable, exhibit fast response, small in size, and have low hysteresis and power consumption. However, the performance of these biosensors is influenced by a variety of factors, including the design, geometry, materials and fabrication procedures. Other less appreciated factors influencing the MI effect include measuring circuit implementation, the material used for construction, geometry of the thin film sensing element, and patterning shapes compatible with the interface microelectronic circuitry. The type magnetic (ferrofluid, Dynabeads, and nanoparticles) and size of the particles, the magnetic particle concentration, magnetic field strength and stray magnetic fields can also affect the sensor sensitivity. Based on these considerations it is proposed that ideal MI biosensor sensitivity could be achieved when the sensor is constructed in sandwich thick magnetic layers with large sensing area in a meander shape, measured with circuitry that provides the lowest possible external inductance at high frequencies, enclosed by a protective layer between magnetic particles and sensing element, and perpendicularly magnetized when detecting high-concentration of magnetic particles.

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