Controlling Magnetization of Gr/Ni Composite for Application in 2 High-Performance Magnetic Sensors

چکیده مقاله

ABSTRACT: Graphene (Gr), a well-known 2D material, has been
9 under intensive investigation in the past decade due to its high
10 potential applications in industry and advanced technological
11 elements. Composites made of Gr and other functional materials
12 especially magnetic materials have opened opportunities in sensors,
13 health care monitoring, magnetic devices, etc. Here, we report a mass
14 production of Gr/Ni composite powders using an electrochemical
15 exfoliation/deposition method with different magnetic strengths of the
16 final composite material. We applied the magnetic composite materials
17 in a magnetoimpedance (MI)-based sensor and observed a significant
18 enhancement in the MI effect and its field sensitivity. Such magnetic
19 composites with controlled magnetization strengths are coated on the
20 MI-ribbon sensor surface, and different MI responses are observed.
21 Furthermore, the MI response of a ribbon coated with a Gr/Ni layer is
22 theoretically determined based on an electrodynamic model with a qualitative consistency to experimental results. Our
23 comprehensive study can be applied in high-performance functionalized MI-based magnetic sensors and devices.