Magnetic Sensor Using Second Harmonic Change in Magneto-Impedance Effect

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Abstract
This study reports on a magnetic sensor composed of a Cu wire sandwiched between Co-based amorphous ribbons. The impedance of the Cu wire largely depends on the permeability of the amorphous ribbons and changes with an external field. This phenomenon results in a change in the voltage at the fundamental frequency (V 1st) and that at the second harmonic frequency (V 2nd) at both ends of the Cu wire. The maximum V 2nd variation rate was ∼150%/Oe which is about 15 times larger than that of V 1st. The detection of the second harmonic voltage offers the potential for a great improvement in the magnetic field sensitivity.

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