A novel excellent response of giant magnetoimpedance effect was found out in a magnetic
LC-resonator consisting of a glass-coated amorphous Co83.2B3.3Si5.9Mn7.6 microwire and two
capacitive cylindrical electrodes at the end of the microwire. The shapes of the impedance curves
plotted vs. applied external dc-field varied dramatically with increasing frequency. The phase angle
was also strongly found to be dependent on this field. The impedance curves were changing abruptly
at near the resonance frequency. Because the permeability of ultra soft magnetic microwire is
changing rapidly as a function of external magnetic field, the resonance frequency as well as
impedance of the LC-resonator also changes drastically with respect to the external magnetic field.
The maximum magnetoimpedance ratio value was reached as much as 1,600%. The sudden changes
of phase angle as much as 180 degree evidenced the occurrence of resonance phenomenon. These
results are promising for developing ultra-high sensitive magnetic sensor applications.