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An anomalous Hall effect in edge-bonded monolayer graphene
Hui Liu1,2, Heng Wang3, Zhisheng Peng1,2
1CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190, China. slf@nanoctr.cn.
Nanoscale Horizons
|July 6, 2023
Summary
Pristine graphene exhibits an anomalous Hall effect (AHE), contrary to prior assumptions. This discovery in edge-bonded monolayer graphene opens possibilities for carbon-based spintronics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- Pristine graphene is typically considered diamagnetic, precluding the observation of the anomalous Hall effect (AHE).
- Previous research has not demonstrated AHE in undoped graphene systems.
Purpose of the Study:
- To investigate the possibility of observing AHE in pristine graphene.
- To explore the magnetic properties of edge-bonded monolayer graphene.
- To assess the potential for carbon-based spintronic applications.
Main Methods:
- Fabrication of edge-bonded monolayer graphene.
- Measurement of Hall resistance and longitudinal resistance under varying gate voltages and magnetic fields.
- Analysis of temperature-dependent transport properties.
Main Results:
- Gate-tunable Hall resistance observed in pristine graphene without an external magnetic field.
- Evidence of both ordinary Hall effect and AHE in perpendicular magnetic fields.
- Observation of quantum Hall effect plateaus and significant magnetoresistance at different temperatures.
- Detection of a long-range ferromagnetic order in pristine graphene.
Conclusions:
- The study confirms the presence of AHE in pristine graphene, challenging previous assumptions.
- The observed phenomena suggest intrinsic ferromagnetism in graphene.
- These findings pave the way for novel applications in graphene-based spintronics.
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