Abstract
We theoretically analyzed the magnetoimpedance profile of a thin-film element with a DC bias current using the bias susceptibility theory and Maxwell’s equations. Although the analysis model predicts that an element with a rectangular cross section shows symmetric impedance property with respect to the Z-axis with DC bias current, the experimental results showed asymmetric properties. Taking the shape imbalance and trapezoidal cross section of the element into account, we explained the asymmetric impedance properties qualitatively.
Highlights
By 1935, it was known that the impedance of ferromagnetic materials at higher frequency changes due to the skin effect, when subjected to an external magnetic field.[1]
Asymmetric properties were obtained with DC bias current in the experiments, and we have given a brief interpretation of the results, a more detailed investigation is required for practical applications
We analyzed the magnetoimpedance behavior when a DC bias current was applied to an element, on the basis of the bias susceptibility theory and Maxwell’s equations
Summary
By 1935, it was known that the impedance of ferromagnetic materials at higher frequency changes due to the skin effect, when subjected to an external magnetic field.[1]. Though amorphous wires and ribbons are mainly used,[10,11,12,13,14] they are not suitable for the miniaturization of sensor elements. Thin-film magnetoimpedance elements are more compatible with miniaturized integrated electronic devices; the sensitivity of the elements is less than that of wires and ribbons. We experimentally demonstrated a method of improving or adjusting the sensitivity of elements with an inclined easy axis of a smaller angle using a DC bias current[15] after the fabrication process of the elements. Asymmetric properties were obtained with DC bias current in the experiments, and we have given a brief interpretation of the results, a more detailed investigation is required for practical applications. In this study, we analyze the results based on the bias susceptibility theory and Maxwell’s equations, taking into account the geometry unbalance of the element
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