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Proximity-induced magnetism (PIM) in graphene (Gr) adjacent to magneticspecimen has raised great fundamental interests. The subject is under debateand yet no application is proposed and granted. In this paper, towardaccomplishment of fundamental facts, we first explore the effect of particlesize and clustering in the PIM in Gr nanoplates (GNPs)/yttrium iron garnet(YIG) magnetic nanoparticle (MNP) composite. Microscopic analyzes suggest thatfine MNPs distributed uniformly on the GNPs have higher saturationmagnetization due to the PIM in Gr. We propose that such magnetic plates canthus be used to shield the stray field generated on the surface of magneticsensors and play a role as a magnetic lens to prevent the field emanatingoutside the body of magnetic specimen. The GNPs/YIG composites are coated on amagnetic ribbon and proposed for application in magneto-impedance (MI) sensors.We show that such planar magnetic flakes enhance the MI response against theexternal applied magnetic field significantly. The suggested application can befurthermore developed toward bio-sensing and magnetic shielding in differentmagnetic sensors and devices.

Effect of YIG Nanoparticle Size and Clustering in Proximity-Induced  Magnetism in Graphene/YIG Composite Probed with Magnetoimpedance Sensors:  Towards Improved Functionality, Sensitivity and Proximity Detection