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24 June 2002 Giant magneto-impedance in structured materials
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Recent discovery of giant magneto-impedance (GMI) has opened new horizons in the development of micro magnetic sensor technology. GMI involves a very large and sensitive change in complex impedance of certain soft magnetic materials. However, with decreasing the sensor element Size, the maintenance of such high sensitivity becomes a major concern. Special thin-film structures are employed to improve GMI performance in miniature elements. The present paper concerns the principal advantages of GMI in magnetic/metallic multilayered materials. The physical concepts, theoretical analysis based on field-dependent surface impedance matrix and experimental results are discussed. This includes multi-fold enhancement of the GMI ratio and a considerable extension of the operational frequency range. Along with this, special types of magnetic anisotropy can be induced in layered systems to realize asymmetrical GMI. This property is of particular interest for magnetic sensor applications.
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Larissa V. Panina and D. P. Makhnovskiy "Giant magneto-impedance in structured materials", Proc. SPIE 4806, Complex Mediums III: Beyond Linear Isotropic Dielectrics, (24 June 2002);

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