Novel magnetophoretic device resembling a spider web network, being integrated with planar Hall resistance sensor, has been developed for the simultaneous concentric transportation and monitoring of superparamagnetic streptavidin-loaded cargos (particles). The multilayer sensor and permalloy network tracks have been fabricated by successive micropatterning processes of film deposition and photolithography. The transporting particles are precisely manipulated on the magnetic tracks towards the sensor by an external magnetic field, where the sensor signal varies with the accumulated particle number. This effective collection and monitoring platform could open novel bioassays overcoming limitation of Brownian transportation of biomolecules to the sensor surface.
- Byeonghwa Lim
- Sri Ramulu Torati
- CheolGi Kim
