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Gate-Tunable Spin Hall Effect in an All-Light-Element Heterostructure: Graphene with Copper Oxide
Haozhe Yang1, Maider Ormaza2, Zhendong Chi1
1CIC nanoGUNE BRTA, 20018 Donostia-San Sebastian, Basque Country, Spain.
Nano Letters
|May 4, 2023
Summary
Researchers developed a novel graphene-based system for efficient spin-to-charge conversion. This all-light-element heterostructure enhances the spin Hall effect, offering a promising alternative to heavy metals for spintronic applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Graphene's low spin-orbit coupling is ideal for spin transport but hinders the spin Hall effect.
- Enhancing the spin Hall effect in graphene without compromising spin diffusion length is a key challenge.
- Light atom decoration is a predicted method to boost spin Hall angle in graphene.
Purpose of the Study:
- To investigate the induction of the spin Hall effect in graphene using a light metal oxide.
- To explore the tunability of the spin Hall effect by adjusting the Fermi level.
- To demonstrate a heavy-metal-free and scalable system for efficient spin-to-charge conversion.
Main Methods:
- Fabrication of a graphene/oxidized copper heterostructure.
- Measurement of spin Hall effect efficiency as a function of Fermi level.
- Characterization of the spin Hall effect's temperature dependence.
Main Results:
- The graphene/oxidized copper heterostructure exhibits a tunable spin Hall effect.
- Maximum spin Hall effect efficiency of 1.8 ± 0.6 nm was observed at 100 K near the charge neutrality point.
- The effect is gate-tunable and observable up to room temperature.
- The all-light-element system demonstrates higher efficiency than conventional heavy metal materials.
Conclusions:
- Decoration of graphene with light metal oxides effectively induces and enhances the spin Hall effect.
- The developed heterostructure provides an efficient, tunable, and heavy-metal-free platform for spin-to-charge conversion.
- This approach is compatible with large-scale fabrication, paving the way for practical spintronic devices.
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