About Junyi's research on Magnetic Biosensor Array:

This research is aimed to improve the performance of the giant magnetoresistance (GMR)-based magnetic biosensor array, which detects the fringing fields of the magnetic nano-particle (MNP) labels attaching to the sensor surface via biomolecules. The GMR biosensors are promising for sensitive, large-scale, inexpensive, and portable biomolecular detection. By utilizing both frequency division multiplexing (FDM) and time division multiplexing (TDM), our research group has already established the measurement system for biological diagnostics. But the detection is limited by the high low-frequency Flicker noise and low signal caused by the MNPs.

For the Flicker noise, with experiment results under different magnetic condition, the effect of magnetic domain structures on Flicker noise was studied. Also, correlated double sampling technique was explored to reduce the highly correlated Flicker noise. For the signal caused by MNPs fringing field, both experiments and simulations will be performed to study the effect of spatial location of MNPs over SV and MTJ sensors, and to provide theoretical support for further sensor design modification.