Electron-magnon coupling reveals key insights into the interfacial properties between non-magnetic metals and magnetic insulators, influencing charge transport and spin dynamics. Here, we present temperature-dependent Raman spectroscopy and magneto-transport measurements of few-layer graphene (FLG)/antiferromagnetic FePS3 heterostructures. The magnon mode in FePS3 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 (±0.2T), persisting up to 100 K; beyond this, MR transitions to positive. Notably, as layer thickness decreases, the coupling strength at the interface reduces, leading to a suppression of negative MR. Additionally, magnetodielectric measurements in the FLG/FePS3/FLG heterostructure show an upturn at temperatures significantly below (TN), suggesting a role for the magnon mode in capacitance, as indicated by hybridization between magnon and phonon bands in pristine FePS3 \textit{via} magnetoelastic coupling.
@article{arxiv.2411.08597,
title = {Electron-Magnon Coupling Mediated Magnetotransport in Antiferromagnetic van der Waals Heterostructure},
author = {Sujan Maity and Soumik Das and Mainak Palit and Koushik Dey and Bikash Das and Tanima Kundu and Rahul Paramanik and Binoy Krishna De and Hemant Singh Kunwar and Subhadeep Datta},
journal= {arXiv preprint arXiv:2411.08597},
year = {2024}
}