Manipulation of magnetic particles in conduits for the propagation of domain walls

We proposed and used magnetic domain walls as easily moveable (by means of remote weak magnetic fields) traps for magnetic nano- and micro-particles. We designed magnetic domain wall conduits, following the guidelines of our own micro-magnetic simulations, and fabricated them by means of electron beam lithography. With these structures, we then demonstrated the actual transport of magnetic particles in liquids with nm-scale precision, solely by means of an externally applied magnetic field, which allowed for remote on-chip operation. More recently, we have developed a process to transfer and integrate our domain wall conduits directly in microfluidic channels defined on a chip.