TY - JOUR
T1 - Comparative analysis of several GMR strip sensor configurations for biological applications
AU - Klein, Todd
AU - Wang, Yi
AU - Tu, Liang
AU - Yu, Lina
AU - Feng, Yinglong
AU - Wang, Wei
AU - Wang, Jian Ping
PY - 2014/9/1
Y1 - 2014/9/1
N2 - 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.
AB - 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.
KW - Biosensor
KW - GMR
KW - Giant magnetoresistance
KW - Magnetic nanoparticles
KW - Position-dependant sensing
UR - http://www.scopus.com/inward/record.url?scp=84903974338&partnerID=8YFLogxK
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U2 - 10.1016/j.sna.2014.05.033
DO - 10.1016/j.sna.2014.05.033
M3 - Article
AN - SCOPUS:84903974338
VL - 216
SP - 349
EP - 354
JO - Sensors and Actuators, A: Physical
JF - Sensors and Actuators, A: Physical
SN - 0924-4247
ER -