Large-area GMR bio-sensors based on reverse nucleation switching mechanism

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5 Scopus citations


In the past 20 years, several studies have been performed on the detection of biomarkers by the stripe-shaped spin valve sensors, whose sensitivity is limited by their small sensing area and large sensor resistance. In this paper, large-area spin valve sensors with lower aspect ratio are introduced. A reverse nucleation mechanism is proposed to demonstrate the different switching processes in large-area sensors. The simulation results further prove the involvement of reverse nucleation sites during the magnetization reversal. Large-area sensors also exhibit a linear response to the concentration of magnetic nanoparticles with a sensor signal more than 20 times larger than the stripe sensors.

Original languageEnglish (US)
Pages (from-to)484-489
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
StatePublished - Mar 1 2019

Bibliographical note

Funding Information:
This work is supported by National Science Foundation MRSEC facility program, Institute of Engineering in Medicine of the University of Minnesota , Centennial Chair Professorship, Robert F Hartmann Endowed Chair, the Distinguished McKnight University Professorship, and UROP program from the University of Minnesota.

Publisher Copyright:
© 2018


  • Biomarker detection
  • Large-area sensor
  • Magnetoresistance
  • Reverse nucleation
  • Spin valve


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