A NEW GIANT MAGNETO-IMPEDANCE HEAD USING MAGNETIC MICROSTRIP LINES

The performance of a novel magneto-impedance (MI) sensor head is descr ibed. The sensor is based on a magnetic microstrip line whose transmis sion impedance changes due to the permeability variation induced in th e magnetic strip by external fields. The effects of device geometry on the performance is examined. It is found that output signal increases with both higher carrier power and narrower strip width. A microsenso r with magnetic strip dimensions of 5X20 mu m demonstrated a high sens itivity of 6 mV(pp)/Oe and a broad bandwidth of 300 MHz at an input po wer of 1 mW.