Enhanced magnetoimpedance effect in stratified graphene paper/FeNi film composited material

• Graphene-based magnetoimpedance material has been successfully prepared.
• Soft magnetic FeNi alloy covered the both surfaces of graphene paper by electrochemical deposition and magnetron sputtering.
• Stratified FeNi/graphene/FeNi composite exhibited an enhanced magnetoimpedance effect.

Enhanced magnetoimpedance effect has been observed in graphene-based composite materials. Graphene papers were synthesized in large quantities using a modified chemical approach. Two methods have successfully prepared the FeNi/graphene/FeNi composite: electrochemical deposition and magnetron sputtering. For the electro-deposited sample, graphene paper turns crumpled and the deposited FeNi looks like flower-petals. While for sputtered FeNi films on graphene paper the layered structure was observed distinctly. Both samples show magnetoimpedance effect at low frequencies. Especially, the stratified FeNi/graphene/FeNi composite exhibited an enhanced magnetoimpedance effect, which is about 10 times as large as single FeNi film or multilayer film structure at low frequency.