Abstract
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 language | English (US) |
|---|---|
| Pages (from-to) | 484-489 |
| Number of pages | 6 |
| Journal | Journal of Magnetism and Magnetic Materials |
| Volume | 473 |
| DOIs | |
| State | Published - 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
Keywords
- Biomarker detection
- Large-area sensor
- Magnetoresistance
- Reverse nucleation
- Spin valve