A highly sensitive high frequency carrier-type magnetic field sensor based on the giant magnetoimpedance effect has been developed. It has been combined with a high frequency carrier suppressing circuit to reduce carrier phase noise dramatically. Highly sensitive magnetic field resolution of 8.8 10 7 Oe (8.8 10 11 ) was demonstrated.Index Terms-Carrier suppression, giant magnetoimpedance, high frequency carrier, magnetic field sensor, phase noise.

The swimming properties of spiral-type magnetic micromachines were analyzed theoretically by 2-dimensional finite volume. Good agreement between experimental and theoretical results was obtained. Swimming properties of micromachines depend strongly on the operational environment, including the flow field and machine structure. We analyzed the effect of machine shape on swimming properties. The optimum design of the blade shape was obtained by simulation. Based on optimum design, the micromachine was fabricated by stereolithography. Machine swimming agreed well with results.

Abstracf-Effect of a machine shape on swimming propertles of the spiral-type magnetic micro-machine was examined by using a finite volume method. The optimum design of the blade shape was obtained by using the results of the simulation. According to the optimum design, the micro-machine was fabricated by a stcreolithography. The swimming properties of the machine were agreed well with the analyzed results.Ziidex Term-micro-machine, spiral blade, finite volume method, stereolithography.

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