Graphene as a non-magnetic spin-current lens

TL;DR

This paper proposes using curved boundaries in graphene as non-magnetic lenses to focus and redirect spin currents, significantly reducing information loss in spintronic devices.

Contribution

It introduces a novel non-magnetic lensing mechanism in graphene for spin currents, enhancing information transfer efficiency in spintronics.

Findings

Curved boundaries in graphene can focus spin currents effectively.

The lens redirects spin currents towards a designated probe region.

Significant reduction in magnetic information loss demonstrated.

Abstract

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.