Design of Magnetic Graphene-ribbon for 100 Tera-bit/inch2 Information Storage Media

TL;DR

This paper explores the design of magnetic graphene ribbons with high spin states for ultra high density data storage, demonstrating that layered structures enhance magnetism and stability for potential 100 Tera-bit/inch2 media.

Contribution

It introduces a novel approach to designing magnetic graphene ribbons with layered structures to achieve ultra high density data storage capabilities.

Findings

Highest spin states are more stable than lower ones.

Layer multiplication enhances magnetism.

Bilayer and quadri-layer models show increased stability.

Abstract

Magnetic graphene-ribbon is a candidate for realizing future ultra high density 100 tera bit/inch2 class data storage media. Multiple spin state analysis was done based on the density function theory. A typical model was a super cell [C80H7] which having bare (radical) carbons on one side zigzag edge, whereas mono hydrogenated on another side. Optimizing atomic configuration, self consistent calculation demonstrated that a total energy of the highest spin state is more stable than that of lower one, which came from exchange coupling between carbons. This analysis suggested a capability of designing magnetic data track utilizing such chemically edge modified graphene ribbon. In order to increase areal magnetization density, bilayer and quadri-layer graphene-ribbon model were analyzed. Detailed calculation resulted that also the highest spin state is the most stable one. Multiplying the layer numbers is effective way to realize and enhance strong magnetism.