Giant magnetoimpedance in composite wires with insulator layer between non-magnetic core and soft magnetic shell

摘要

A method for calculation of the magnetoimpedance in composite wires having aninsulator layer between non-magnetic core and soft magnetic shell is described.It is assumed that the magnetic shell has a helical anisotropy and the drivingcurrent flows through the core only. The distribution of eddy currents andexpressions for the impedance are found by means of a solution of Maxwellequations taking into account the magnetization dynamics within the shellgoverned by the Landau-Lifshitz equation. The effect of the insulator layer onthe magnetoimpedance is analyzed.