Biomedical Microdevices

, Volume 15, Issue 4, pp 665–671 | Cite as

Modeling and experiments of magneto-nanosensors for diagnostics of radiation exposure and cancer

  • Dokyoon Kim
  • Jung-Rok Lee
  • Eric Shen
  • Shan X. Wang


We present a resistive network model, protein assay data, and outlook of the giant magnetoresistive (GMR) spin-valve magneto-nanosensor platform ideal for multiplexed detection of protein biomarkers in solutions. The magneto-nanosensors are designed to have optimal performance considering several factors such as sensor dimension, shape anisotropy, and magnetic nanoparticle tags. The resistive network model indicates that thinner spin-valve sensors with narrower width lead to higher signals from magnetic nanoparticle tags. Standard curves and real-time measurements showed a sensitivity of ~10 pM for phosphorylated-structural maintenance of chromosome 1 (phosphor-SMC1), ~53 fM for granulocyte colony stimulation factor (GCSF), and ~460 fM for interleukin-6 (IL6), which are among the representative biomarkers for radiation exposure and cancer.


Radiation biomarker Cancer biomarker Nanosensor Magnetic nanoparticles Immunoassay 



Phosphorylated-structural maintenance of chromosome 1


Granulocyte colony stimulation factor




Giant magnetoresistance


Magnetic tunnel junction


Enzyme-linked immunosorbent assay


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Dokyoon Kim
    • 1
  • Jung-Rok Lee
    • 2
  • Eric Shen
    • 1
  • Shan X. Wang
    • 1
    • 3
  1. 1.Department of Materials Science and EngineeringStanford UniversityStanfordUSA
  2. 2.Department of Mechanical EngineeringStanford UniversityStanfordUSA
  3. 3.Department of Electrical EngineeringStanford UniversityStanfordUSA

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