不連続的GMI素子におけるインピーダンス不連続点の外部磁界変動に対する安定性(計測・高周波デバイス)

概要

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A giant magnetoimpedance element with a step-like impedance property was obtained in the case of amorphous Co_<85>Nb_<12>Zr_3 soft magnetic thin film in a rectangular shape with an in-plane uniaxial easy axis at an angle of approximately 60 degrees relative to the width direction of the element. It was shown experimentally that the magnetic field in which the step-like impedance change occurs has an almost constant value, with a standard deviation in the micro tesla (μT) range, when an alternating magnetic field of constant amplitude is applied. There is a possibility of applying this phenomenon to a magnetic switch. This application requires a constant impedance step-point uninfluenced by the route or amplitude of the external magnetic field. In this paper, a variation of the magnetic field in which the impedance step occurs as a function of the range of the alternating magnetic field is studied. As a result, a stability of less than 20 mOe (1.6 A/m) at about 1200 mOe (96 A/m) is obtained for the impedance step-point, with consideration given to every experimental condition of the range of applying magnetic field. This result means that it is possible to make a magnetic switch with a switching field accuracy of less than 2%.
社団法人日本磁気学会の論文
2008-05-01