Abstract
We demonstrate a large enhancement of the spin accumulation in monolayer graphene following electron-beam induced deposition of an amorphous carbon layer at the ferromagnet-graphene interface. The enhancement is 104-fold when graphene is deposited onto poly(methyl metacrylate) (PMMA) and exposed with sufficient electron-beam dose to cross-link the PMMA, and 103-fold when graphene is deposited directly onto SiO2 and exposed with identical dose. We attribute the difference to a more efficient carbon deposition in the former case due to an increase in the presence of compounds containing carbon, which are released by the PMMA. The amorphous carbon interface can sustain very large current densities without degrading, which leads to very large spin accumulations exceeding 500 μeV at room temperature.
Highlights
(NLSVs) comprising ferromagnetic contacts and a graphene channel6 are of particular interest because of the ease to manipulate the spin during transport by external electric fields or by modifying the graphene physical properties through the addition of adatoms.1,3 They can be used to study spin torque switching7,8 or spin Hall effects,9 if large spin accumulation and large pure spin currents are achieved
We demonstrate a large enhancement of the spin accumulation in monolayer graphene following electron-beam induced deposition of an amorphous carbon layer at the ferromagnet-graphene interface
The amorphous carbon interface can sustain very large current densities without degrading, which leads to very large spin accumulations exceeding 500 leV at room temperature
Summary
(NLSVs) comprising ferromagnetic contacts and a graphene channel6 are of particular interest because of the ease to manipulate the spin during transport by external electric fields or by modifying the graphene physical properties through the addition of adatoms.1,3 They can be used to study spin torque switching7,8 or spin Hall effects,9 if large spin accumulation and large pure spin currents are achieved. We demonstrate a large enhancement of the spin accumulation in monolayer graphene following electron-beam induced deposition of an amorphous carbon layer at the ferromagnet-graphene interface.
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