Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.147201
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Funding
- Leverhulme Trust [F/09 154/E]
- Schlumberger Cambridge International Scholarship
- United Kingdom EPSRC DTA award
- Royal Society
- EU Graphene Flagship
- ERC Grant Hetero2D
- EPSRC [EP/K01711X/1, EP/K017144/1, EP/N010345/1, EP/M507799/1, EP/L016087/1]
- Wolfson College
- EPSRC [EP/K01711X/1, EP/K017144/1, EP/N010345/1, EP/M507799/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M507799/1, EP/N010345/1, EP/K01711X/1, EP/K017144/1] Funding Source: researchfish
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We report a spin valve with a few-layer graphene flake bridging highly spin-polarized La0.67Sr0.33MnO3 electrodes, whose surfaces are kept clean during lithographic definition. Sharp magnetic switching is verified using photoemission electron microscopy with x-ray magnetic circular dichroism contrast. A naturally occurring high interfacial resistance similar to 12 M Omega facilitates spin injection, and a large resistive switching (0.8 M Omega at 10 K) implies a 70-130 mu m spin diffusion length that exceeds previous values obtained with sharp-switching electrodes.
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