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Graphene (Gr), a well-known 2D material, has been under intensiveinvestigation in the last decade due to its high potential applications inindustry and advanced technological elements. The Gr, while composed withmagnetic materials, has opened new opportunities for further developments ofmagnetic based devices. Here, we report a mass production of Gr/Ni compositepowders using electrochemical exfoliation/deposition method with differentmagnetic strengths of the final composite material. We applied the magneticcomposite materials in a magnetoimpedance (MI) based sensor and observedsignificant enhancement in the MI effect and its field sensitivity. Suchmagnetic composites with controlled magnetization strengths are coated on theMI-ribbon sensor surface and different MI responses are observed. The MIresponse of a ribbon coated with a Gr/Ni layer is theoretically determinedbased on an electrodynamic model with a qualitative consistency between theexperimental results and the theoretical model. Our comprehensive study can beapplied in high performance functionalized MI based magnetic sensors anddevices.

Controlling Magnetization of Gr/Ni Composite for Application in High Performance Magnetic Sensors