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

TL;DR

This study investigates how nanoparticle size and clustering affect proximity-induced magnetism in graphene/YIG composites, demonstrating enhanced sensor responses and potential applications in magnetic shielding and bio-sensing.

Contribution

It reveals the influence of nanoparticle size and distribution on PIM in graphene composites and proposes their use in improved magneto-impedance sensors.

Findings

Uniformly distributed fine MNPs increase saturation magnetization

GNPs/YIG composites enhance MI response significantly

Potential for magnetic shielding and bio-sensing applications

Abstract

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