Electromagnetic analysis of layered magnetic/conductor structures

A method is described for calculating the impedance of conductor structures comprised of ferromagnetic and non-magnetic layers of arbitrary cross sect ional shape with transverse dimensions which are small compared to the cond uctors length. The method is exemplified on a conductor of axial symmetry e nclosed in a high permeability film of uniaxial anisotropy along the conduc tor axis. To find the impedance the full boundary value problem for the vec tor potential is solved, allowing driving and eddy currents in both the con ductor and the magnetic film, and taking into account the dynamics of the m agnetization governed by the Landau-Lifshitz equations. The results obtaine d are used to model the giant magneto impedance effect in ferromagnetically coated wires.