157 research outputs found
Spin relaxation related to the edge scattering in graphene
We discuss the role of spin-flip scattering of electrons from the magnetized
edges in graphene nanoribbons. The spin-flip scattering is associated with
strong fluctuations of the magnetic moments at the edge. Using the Boltzmann
equation approach, which is valid for not too narrow nanoribbons, we calculate
the spin relaxation time in the case of Berry-Mondragon and zigzag graphene
edges. We also consider the case of ballistic nanoribbons characterized by very
long momentum relaxation time in the bulk, when the main source of momentum and
spin relaxation is the spin-dependent scattering at the edges. We found that in
the case of zigzag edges, an anomalous spin diffusion is possible, which is
related to very weak spin-flip scattering of electrons gliding along the
nanoribbon edge.Comment: 9 pages, 7 figure
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