Graphene as a non-magnetic spin-current lens

Details Graphene as a non-magnetic spin-current lens Graphene as a non-magnetic spin-current lens

2010-09-30

arxiv.org/abs/1009.6228v2

J. Phys.: Condens. Matter 23 (2011) 175302

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 3 figures

Scientific paper

10.1088/0953-8984/23/17/175302

In spintronics, the ability to transport magnetic information often depends on the existence of a spin current traveling between two different magnetic objects acting as source and probe. A large fraction of this information never reaches the probe and is lost because the spin current tends to travel omni-directionally. We propose that a curved boundary between a gated and a non-gated region within graphene acts as an ideal lens for spin currents despite being entirely of non-magnetic nature. We show as a proof of concept that such lenses can be utilized to redirect the spin current that travels away from a source onto a focus region where a magnetic probe is located, saving a considerable fraction of the magnetic information that would be otherwise lost.

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