Issue 9, 2023

An anomalous Hall effect in edge-bonded monolayer graphene

Abstract

An anomalous Hall effect (AHE) is usually presumed to be absent in pristine graphene due to its diamagnetism. In this work, we report that a gate-tunable Hall resistance Rxy can be obtained in edge-bonded monolayer graphene without an external magnetic field. In a perpendicular magnetic field, Rxy consists of a sum of two terms: one from the ordinary Hall effect and the other from the AHE (RAHE). Plateaus of Rxy ∼ 0.94h/3e2 and RAHE ∼ 0.88h/3e2 have been observed while the longitudinal resistance Rxx decreases at a temperature of 2 K, which are indications of the quantum version of the AHE. At a temperature of 300 K, Rxx shows a positive, giant magnetoresistance of ∼177% and RAHE still has a value of ∼400 Ω. These observations indicate the existence of a long-range ferromagnetic order in pristine graphene, which may lead to new applications in pure carbon-based spintronics.

Graphical abstract: An anomalous Hall effect in edge-bonded monolayer graphene

Supplementary files

Article information

Article type
Communication
Submitted
10 6月 2023
Accepted
18 6月 2023
First published
29 6月 2023
This article is Open Access
Creative Commons BY license

Nanoscale Horiz., 2023,8, 1235-1242

An anomalous Hall effect in edge-bonded monolayer graphene

H. Liu, H. Wang, Z. Peng, J. Jin, Z. Wang, K. Peng, W. Wang, Y. Xu, Y. Wang, Z. Wei, D. Zhang, Y. J. Li, W. Chu and L. Sun, Nanoscale Horiz., 2023, 8, 1235 DOI: 10.1039/D3NH00233K

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