Academic paper

Large bias-tunable magnetoresistance from spin-dependent interlayer hybridization in van der Waals antiferromagnet CrSBr-based heterostructures

Authors: Sadeed Hameed (1), Aditya Kumar (1), Chengjie Yu (2), Aravind P. Balan (1 and 3), Xinran Wang (1), Lichuan Zhang (2), Yuriy Mokrousov (1 and 4), Mathias Kl\"aui (1 and 5) ((1) Institute of Physics, Johannes Gutenberg University Mainz, Mainz, Germany, (2) School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang, China, (3) Department of Materials Science and NanoEngineering, Rice University, Houston, Texas, USA, (4) Peter Gr\"unberg Institut and Institute for Advanced Simulation, Forschungszentrum J\"ulich and JARA, J\"ulich, Germany, (5) Centre for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway)Published: 2026-08-11Paper ID: 2608.11389Category: cond-mat.mes-hallLicense: CC BY 4.0

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Abstract

We explore the large magnetoresistance (MR) in \ce{hBN}/few-layer-graphene/\ce{CrSBr}/few-layer-graphene heterostructures and reveal the mechanism behind its non-monotonic bias dependence. Using bias voltage and temperature as independent tuning knobs, we achieve MR up to \SI{350}{\percent} at \SI{20}{K}, characterized by symmetric M-shaped maxima around $\pm 0.5\,\mathrm{V}$. Continuous tuning of the magnetization angle $\theta$ via a hard-axis magnetic field shows that the barrier band-edge offset varies linearly with $\cos(\theta/2)$, a first-order signature of spin-dependent interlayer hybridization. This linear relationship rules out the Julli\`ere model and a spin-filter projection. We conclude that the magnetic-configuration-dependent band edge, rather than electrode spin polarization, dictates the large magnetoresistance in \ce{CrSBr} junctions.

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