An electromagnetic micromotor has been developed that combines microcoils and magnetic microtips as stator elements and individual permanent magnet single domain particles as rotors. The three-phase stator microcoils (with poles separated by 100 μm) are positioned outside the fluid, and the rotor (a 40 μm long, 1 μm diam permanent magnet) spins in aqueous solution 50 μm from the stator. The small size and essentially disposable rotors make the magnetic micromotor attractive for use in microfluidics systems for various physical, chemical, and biological applications.
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Barbic et al. (2001) studied this question.
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