Electrically tunable spin polarization in graphene superlattices
Researchers from the National University of Singapore, University of Manchester and National Institute for Materials Science have shown that magnetic proximity can be used to electrically control large spin signals in graphene superlattices, achieving spin polarizations approaching 50% and nonlocal spin resistances above 300 Ω near charge neutrality.
By placing graphene in close proximity to a magnetic material, they induce a magnetic proximity effect that spin-splits graphene’s bands via interfacial exchange coupling, without permanently magnetizing the carbon lattice or degrading its intrinsic transport properties. In their devices, cobalt contacts are used to generate this exchange field, while pure spin currents are injected and detected nonlocally, allowing the team to map how spin transport responds as the Fermi level is tuned across different charge density regimes.
Source: https://www.spintronics-info.com/electrically-tunable-spin-polarization-graphene-superlattices
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