抄録
The magneto-impedance (MI) behavior has been analyzed in multilayers having an inner conductor lead and two identical magnetic layers with a uniaxial anisotropy which is crossed in the upper film with respect to that in the lower one. Emphasis is placed on the evolution of MI characteristics under the effect of a dc biasing current, which is of interest for developing auto-biased magnetic sensors. Various types of MI can be realized in this case. Among them, asymmetrical anhysteretic MI has special importance for linear magnetic sensing. For analysis, an approximation of a weak skin effect, as well as an exact solution of Maxwell‘s equations, is used, demonstrating that for a CoSiB/Cu/CoSiB film of 1-μm thickness the skin effect can be neglected for frequencies up to the GHz band. The insertion of a conductor lead, by decreasing the resistance of the system, makes the skin effect unimportant for obtaining large impedance changes : MI of 100-250% takes place at frequencies of 10-50 MHz.
