Large room temperature spin-to-charge conversion signals in a few-layer graphene/Pt lateral heterostructure

TL;DR

This paper demonstrates large room-temperature spin-to-charge conversion signals in a graphene/Pt heterostructure, enabling efficient electrical spin current detection crucial for spintronic devices.

Contribution

It reports the largest room-temperature spin-to-charge voltage signal in graphene/Pt heterostructures, leveraging graphene's properties and Pt's spin Hall effect for improved spin current detection.

Findings

Largest spin-to-charge voltage signal at room temperature reported

Utilizes spin Hall effect in Pt for spin current generation

Graphene's long-distance spin transport enhances signal detection

Abstract

Electrical generation and detection of pure spin currents without the need of magnetic materials are key elements for the realization of full electrically controlled spintronic devices. In this framework, achieving a large spin-to-charge conversion signal is crucial, since considerable outputs are needed for plausible applications. Unfortunately, the values obtained so far have been rather low. Here we exploit the spin Hall effect by using Pt, a non-magnetic metal with strong spin-orbit coupling, to generate and detect pure spin currents in a few-layer graphene channel. Furthermore, the outstanding properties of graphene, with long distance spin transport and higher electrical resistivity than metals, allows us to achieve in our graphene/Pt lateral heterostructures the largest spin-to-charge voltage signal at room temperature reported so far in the literature. Our approach opens up exciting opportunities towards the implementation of spin-orbit-based logic circuits and all electrical control of spin information without magnetic field.