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Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions

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Long Spin Diffusion Length in Few-Layer Graphene Flakes.

W Yan¹, L C Phillips¹, M Barbone²

¹Department of Materials Science, University of Cambridge, Cambridge CB3 0FS, United Kingdom.

Physical Review Letters

|October 15, 2016

Summary

This summary is machine-generated.

We developed a novel spin valve using graphene and lanthanum strontium manganite electrodes. This device demonstrates efficient spin injection and a record spin diffusion length for spintronic applications.

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Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

Spin valves are crucial for spintronic devices.
Graphene offers unique electronic properties for spin transport.
Lanthanum strontium manganite (La_{0.67}Sr_{0.33}MnO_{3}) is a highly spin-polarized material.

Purpose of the Study:

To investigate spin transport properties in a graphene-based spin valve.
To explore the potential of La_{0.67}Sr_{0.33}MnO_{3} electrodes for efficient spin injection.
To determine the spin diffusion length in this novel device architecture.

Main Methods:

Fabrication of a spin valve with a few-layer graphene flake bridging La_{0.67}Sr_{0.33}MnO_{3} electrodes.
Utilizing photoemission electron microscopy with x-ray magnetic circular dichroism contrast for magnetic switching verification.
Measuring resistive switching to determine spin diffusion length.

Main Results:

Achieved sharp magnetic switching in the spin valve.
Observed high interfacial resistance (~12 MΩ) facilitating spin injection.
Measured a large resistive switching (~0.8 MΩ at 10 K), indicating a spin diffusion length of 70-130 μm.

Conclusions:

The developed graphene/La_{0.67}Sr_{0.33}MnO_{3} spin valve exhibits excellent performance.
The achieved spin diffusion length surpasses previous records, highlighting the potential for advanced spintronic devices.
This work demonstrates a promising pathway for high-performance spintronic applications.