Electron-magnon coupling reveals key insights into the interfacial properties between nonmagnetic metals and magnetic insulators, influencing charge transport and spin dynamics. Here, we present temperature-dependent Raman spectroscopy and magnetotransport measurements of few-layer graphene (FLG)/antiferromagnetic ${\mathrm{FePS}}_3$ heterostructures. The magnon mode in ${\mathrm{FePS}}_3$ softens below 40 K and effective magnon stiffness decreases with cooling. Magnetotransport measurements show that FLG exhibits negative magnetoresistance (MR) in the heterostructure at low fields ($\pm 0.2\text{T}$), persisting up to 100 K; beyond this, MR transitions to positive. Notably, as layer thickness decreases, the coupling strength at the interface reduces, suppressing negative MR. Additionally, magnetodielectric measurements in the FLG/${\mathrm{FePS}}_3$/FLG heterostructure show an upturn at temperatures significantly below ($T_{\text{N}}$), suggesting a role for the magnon mode in capacitance, as indicated by hybridization between magnon and phonon bands in pristine ${\mathrm{FePS}}_3$ via magnetoelastic coupling.

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• Capacitance
• Magnetoresistance
• Magnetotransport
• Magnons
• 2-dimensional systems
• Antiferromagnets
• Magnetic insulators
• Cryogenics
• Raman spectroscopy