Recently magnetic sensors utilizing the changes of permeability of core material located in a solenoidal inductor as a function of external magnetic field, called as PR (permeability ratio) sensor, has been studied intensively [1]. The main aim of this study is finding a micro-sized magnetic sensor device with great sensitivity operating at high frequency region. Since the high frequency sources are easily available nowadays in communication electronics devices such as PCs, cellular phones, GPS, etc.
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