Micro-size magnetic strip for ultra high frequency carrier type magnetic field sensor

Magnetic strips aimed at high-frequency carrier-type magnetic field sensors were studied by using various strip widths in a carrier frequency range of gigahertz to obtain conditions for large impedance change. The impedance c hange was attributed to a magnetic resonance effect. It was shown that dc m agnetic field regions at which the maximum change of impedance occur for wi de strip elements were closely related to the applied carrier frequencies a s expected theoretically. The dc magnetic field for the maximum sensitivity decreased as strips become narrow.