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In this paper, we investigated a means to manipulate small magnetic beads using the magnetic fields of current-carrying wires. Narrow metallic wires were fabricated with optical lithography and vacuum deposition methods. As we applied 20-40 mA of current, the magnetic beads could be collected on the wire. Depending on the magnitude of the currents, the velocity of the beads was 2-20 mum/s. In addition...
This paper presents the rotation of a silicon nanoneedle fueled by Brownian motion which may lead to a new class of thermo-mechanical nano-motors. A nanoneedle with a magnetic bead at one end is immobilized at the end by a permanent magnet in the water and its rotational Brownian motion is observed. DRIE of a silicon substrate with magnetic nanobeads as the etching mask results in 3.5 mum long needles...
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