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Large Exchange Splitting in Monolayer Graphene Magnetized by an Antiferromagnet



Yingying Wu, Gen Yin, Lei Pan, Alexander Grutter, Quanjun Pan, Albert Lee, Dustin A. Gilbert, Julie A. Borchers, William D. Ratcliff, Ang Li, Xiao-dong Han, Kang L. Wang


Spin splitting in graphene has been identified as a key component for unlocking multifunctionality with low dissipation and long-distance spin transport. Magnetic proximity effects are an extremely promising route to realizing exchange splitting in graphene. Here, we demonstrate the experimental realization of monolayer graphene magnetized by an underlying antiferromagnet. By coupling graphene to an antiferromagnet, we achieve exchange splitting energy as large as 134 meV at 2K. This exchange splitting energy can be modulated through field coolings, increasing with the positive field coolings and decreasing with negative field coolings. This exchange splitting is reflected through the shifted quantum Hall plateau and quantum oscillations in graphene. Further, we present the resistance dependence on the temperature and magneto-optic Kerr measurements which support magnetism in the graphene at low temperatures. This work establishes a key functionality for future graphene-based spin logic and memory devices.
Nature Electronics


Graphene, Quantum Hall Effect, Proximity Effect, Antiferromagnetism


Wu, Y. , Yin, G. , Pan, L. , Grutter, A. , Pan, Q. , Lee, A. , Gilbert, D. , Borchers, J. , Ratcliff, W. , Li, A. , Han, X. and Wang, K. (2020), Large Exchange Splitting in Monolayer Graphene Magnetized by an Antiferromagnet, Nature Electronics, [online], (Accessed June 24, 2024)


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Created September 30, 2020, Updated July 27, 2022