Electron-Magnon Coupling Mediated Magnetotransport in Antiferromagnetic van der Waals Heterostructure

Sujan Maity; Soumik Das; Mainak Palit; Koushik Dey; Bikash Das; Tanima Kundu; Rahul Paramanik; Binoy Krishna De; Hemant Singh Kunwar; Subhadeep Datta

arXiv · 2411.08597

Electron-Magnon Coupling Mediated Magnetotransport in Antiferromagnetic van der Waals Heterostructure

Sujan Maity·Soumik Das·Mainak Palit·Koushik Dey·Bikash Das·Tanima Kundu·Rahul Paramanik·Binoy Krishna De·Hemant Singh Kunwar·Subhadeep Datta

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Abstract

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 FePS$_3$ heterostructures. The magnon mode in 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, leading to a suppression of negative MR. Additionally, magnetodielectric measurements in the FLG/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 FePS$_3$ \textit{via} magnetoelastic coupling.

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Sujan Maity, Soumik Das, Mainak Palit, Koushik Dey, Bikash Das, Tanima Kundu, Rahul Paramanik, Binoy Krishna De, Hemant Singh Kunwar, Subhadeep Datta. 2024-11-13. Electron-Magnon Coupling Mediated Magnetotransport in Antiferromagnetic van der Waals Heterostructure. https://arxiv.org/abs/2411.08597

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