Comparative analysis of several GMR strip sensor configurations for biological applications

Todd Klein, Yi Wang, Liang Tu, Lina Yu, Yinglong Feng, Wei Wang, Jian Ping Wang

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Giant magnetoresistance (GMR) sensor strips are fabricated and modeled with the purpose of detecting a uniform distribution of Fe3O4 magnetic nanoparticles (MNPs) for biological application. We find that the free and fixed layers of GMR sensors play a dominant role in exciting the MNPs, and consequent MNP stray fields lead to increased free layer susceptibility. This result persists even when MNPs are confined to the interior of the sensing region but is enhanced when MNPs are allowed near exterior edges. Our analysis includes three different fabrication configurations on two different spin valve film stacks and agrees well with experimental results.

Original languageEnglish (US)
Pages (from-to)349-354
Number of pages6
JournalSensors and Actuators, A: Physical
StatePublished - Sep 1 2014


  • Biosensor
  • GMR
  • Giant magnetoresistance
  • Magnetic nanoparticles
  • Position-dependant sensing

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