Magnetically Driven Microtools Actuated by a Focused Magnetic Field for Separating of Microparticles

We succeeded in reducing magnetic interaction region with a focused magnetic field on-chip. Novelty of this paper is summarized as follows. (1) We used neodymium powder as the main component of magnetically driven microtools (MMT). The density of magnetic flux was improved by about 100 times after magnetization. (2) We fabricated a couple of pin mounted under a microfluidic chip. The density of magnetic flux was improved by about 1.8 times. As a result, the density of magnetic flux had a single peak using the pin, unlike in a setup without pins. It was confirmed that the size of the magnetic interaction region for the current setting was one twentieth that of the previous setting.