不連続的特性を有した高周波キャリア型磁界センサにおけるインピーダンス特性の温度変化

概要

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Variation of non-linear impedance as a function of circumferential temperature is reported. Non-linear impedance occurs in rectangular strips of thin-film soft magnetic material with a width of tens of microns and with inclined stripe domains. Sensors with different dimensions were studied with circumferential temperatures ranging from -20℃ to 70℃. It was found that the change in the non-linear impedance profile had the same tendency, irrespective of the impedance profile. As the circumferential temperature increases the width of magnetic field between the non-linear impedances, these happen in case of increasing or decreasing the magnetic field, narrows. A method of compensating for the temperature drift of the magnetic field in which non-linear impedance appears is proposed. It is shown that this method compensates well for the temperature drift within the range of measurement error.
2005-06-01