Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Single Magnetic Bead Detection in a Microfluidic Chip Using Planar Hall Effect Sensor

  • Kim, Hyuntai (Department of Materials Science and Engineering, Chungnam National University) ;
  • Reddy, Venu (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, Kun Woo (Department of Materials Science and Engineering, Chungnam National University) ;
  • Jeong, Ilgyo (Department of Materials Science and Engineering, Chungnam National University) ;
  • Hu, Xing Hao (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, CheolGi (Department of Materials Science and Engineering, Chungnam National University)
  • Received : 2013.10.11
  • Accepted : 2013.11.07
  • Published : 2014.03.31
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Abstract

In this study, we fabricate an integrated microfluidic chip with a planar Hall effect (PHE) sensor for single magnetic bead detection. The PHE sensor was constructed with a junction size of $10{\mu}m{\times}10{\mu}m$ using a trilayer structure of Ta(3 nm)/NiFe(10 nm)/Cu(1.2 nm)/IrMn(10 nm)/Ta(3 nm). The sensitivity of the PHE sensor was 19.86 ${\mu}V/Oe$. A diameter of 8.18 ${\mu}m$ magnetic beads was used, of which the saturation magnetization was ~2.1 emu/g. The magnetic susceptibility ${\chi}$ of these magnetic beads was calculated to be ~0.14. The diluted magnetic beads solution was introduced to the microfluidic channel attributing a single bead flow and simultaneously the PHE sensor voltage was measured to be 0.35 ${\mu}V$. The integrated microchip was able to detect a magnetic moment of $1.98{\times}10^{-10}$ emu.

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References

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