抄録
We design small magnetic AC markers and investigate its external magnetic field around a marker. We fabricate several AC markers (12.5mm-length, cross sectional are of marker was 15(mm)^2). Measured field of markers is agreed with theoretical field calculated by Biot-Savart's low. External field was about (10)^<-3> Oe, when we applied 1.5V at 425kHz and the distance between marker and sensor was 100mm.
