Origins of Giant Magnetic Impedance Effect in Magnetic Nanostructures in Millimeter Waveband

摘要

The dependence of a complex transmission coefficient of the electromagnetic wave passing through multilayered and granular nanostructures demonstrating giant magnetic impedance phenomenon as a function of an external magnetic field has been explored in the millimeter waveband (f =34 GHz). The magnetic multilayer film Fe_6(Co_1/Cu_2)_(16) and magnetic granular film Co_(51.5)Al_(19.5)O_(29) have been investigated. The maximum magnitudes of the relative module of the complex transmission coefficient 2 % and its phase shift Δφ_T ≈ 1° have been detected. The interrelation between complex impedance Z and the effective conductivity of magnetic nanostructure is analyzed.