Magnetoresistive Biosensing Technologies for Biomedical Applications
Summary
Magnetoresistive biosensors detect biological targets by transducing magnetic signals, typically from magnetic nanoparticles, into electrical resistance changes. Core sensor modalities include anisotropic magnetoresistance (AMR), giant magnetoresistance (GMR), tunnelling magnetoresistance (TMR) and Hall-effect devices, each offering distinct sensitivity, dynamic range and fabrication advantages. Integration with microfluidic channels and magnetic flux concentrators has yielded highly sensitive, label-based and label-free assays for proteins, nucleic acids, cells and whole pathogens. These platforms deliver low background noise, immunity to optical interference and real-time readouts, supporting multiplexed and point-of-care diagnostics. Recent advances in CMOS compatibility, surface chemistry and flexible substrates have enabled portable, high-throughput devices suitable for low-resource settings. Practical applications span early cancer biomarker detection, infectious-disease screening, blood analysis and wearable health monitors. Key challenges remain in achieving uniform nanoparticle functionalisation, minimising electronic noise, standardising assay protocols and scaling production for clinical deployment. Continued interdisciplinary development promises robust, cost-effective biosensing solutions with global impact on healthcare and environmental monitoring.
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Magnetoresistive Biosensing Technologies for Biomedical Applications publication trend
The graph below shows the total number of articles in magnetoresistive biosensing technologies for biomedical applications across all publications each year (not limited to Nature Index journals).
Technical terms
Magnetoresistance: Change in electrical resistance of a material induced by an external magnetic field.
Giant Magnetoresistance (GMR): Large variation in resistance arising from spin-dependent electron scattering in multilayer thin films.
Tunnelling Magnetoresistance (TMR): Resistance modulation due to spin-polarised electron tunnelling across an insulating barrier between ferromagnetic layers.
Hall Effect Sensor: Device that generates a voltage transverse to electric current under an applied magnetic field.
Microfluidics: Manipulation and control of small fluid volumes within channels typically measuring tens to hundreds of micrometres.
Magnetic Nanoparticles (MNPs): Nanoscale magnetic labels functionalised to bind specific biological targets for magnetic detection.
References
- Highly stable integration of graphene Hall sensors on a microfluidic platform for magnetic sensing in whole blood. Microsystems & Nanoengineering (2023).
- Advancing magnetic flow cytometry to quantitative epitope analysis in high hematocrit conditions for point-of-care testing. Biosensors and Bioelectronics (2024).
- Commercial chip-based tunneling magnetoresistance sensor for green-synthesized magnetic nanoparticles assay. Sensors International (2024).
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