Microfluidic magnetic separator using an array of soft magnetic elements

Abstract
We present the design, fabrication, characterization, and demonstration of a new passive magnetic bead separator. The device operates in an effective state when magnetized by an external magnetic field of only 50 mT , which is available from a tabletop electromagnet. We demonstrate the complete capture of 1.0 μ m fluorescent magnetic beads from a 7.5 μ L sample volume traveling at an average linear fluid velocity of 5 mm ∕ s .