Evaluation of induced electromotive force of a carbon micro coil

The magnetic sensing ability of a carbon microcoil (CMC) with a 3 to 5 mum diameter and 100 to 1000 mum length was evaluated. Since the CMC has an electrically conductive coiled structure, it was found to induce an alternating electromotive force in an alternating magnetic field, similar to a solenoid coil. The electromotive force of the CMC in an alternating magnetic field has a linear relationship with the frequency of the alternating current supplied to an electromagnet. The value of the electromotive force depends on both the number of windings and the electric resistance of the CMC. When a CMC was rotated in a static magnetic field, the electromotive force generated was also related to the frequency of rotation. From these linear relationships, it appears that the CMC could possibly be used as a magnetic micro coil.