Nanostructured Magnetoimpedance Multilayers with Different Thickness of FeNi Components

Magnetic properties and magnetoimpedance of [FeNi/Cu]n/FeNi/Cu (500 nm)/[FeNi/Cu]m/FeNi MI asymmetric and symmetric structures were studied for multilayeres with different thickness (25, 50 or 170 nm) of permalloy layers. The asymmetric structures in the case of FeNi layers of 50 nm show higher sensitivities comparing with symmetric structures. Asymmetric multilayered structures with 25 nm thick FeNi layers are an interesting subject for further investigation as the interactions between FeNi layers seem to be providing the best MI response.