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Single Magnetic Bead Detection in a Microfluidic Chip Using Planar Hall Effect Sensor
- Single Magnetic Bead Detection in a Microfluidic Chip Using Planar Hall Effect Sensor
- Kim, Hyun Tai; Reddy, Venu; Kim, Kun Woo; Jeong, Il Gyo; Hu, XingHao; Kim, Cheol Gi
- DGIST Authors
- Kim, Cheol Gi
- Issue Date
- Journal of Magnetics, 19(1), 10-14
- Article Type
- planar Hall effect sensor; trilayer structure; single magnetic bead detection; microfluidics
- 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 μm × 10 μm 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 μV/Oe. A diameter of 8.18 μm magnetic beads was used, of which the saturation magnetization was ~2.1 emu/g. The magnetic susceptibility χ 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 μV. The integrated microchip was able to detect a magnetic moment of 1.98 × 10-10 emu. © The Korean Magnetics Society. All rights reserved.
- Related Researcher
Lab for NanoBio-MatErials & SpinTronics(nBEST)
Magnetic Materials and Spintronics; Converging Technology of Nanomaterials and Biomaterials; Bio-NEMS;MEMS
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- Department of Emerging Materials ScienceLab for NanoBio-Materials & SpinTronics(nBEST)1. Journal Articles
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