Co dimers on hexagonal carbon rings proposed as subnanometer magnetic storage bits

Details Co dimers on hexagonal carbon rings proposed as subnanometer magnetic storage bits Co dimers on hexagonal carbon rings proposed as subnanometer magnetic storage bits

2009-06-25

arxiv.org/abs/0906.4645v1

Physics

Condensed Matter

Materials Science

13 pages, 4 figures

Scientific paper

It is demonstrated by means of density functional and ab-initio quantum chemical calculations, that transition metal - carbon systems have the potential to enhance the presently achievable area density of magnetic recording by three orders of magnitude. As a model system, Co_2-benzene with a diameter of 0.5 nm is investigated. It shows a magnetic anisotropy in the order of 0.1 eV per molecule, large enough to store permanently one bit of information at temperatures considerably larger than 4 K. A similar performance can be expected, if cobalt dimers are deposited on graphene or on graphite. It is suggested that the subnanometer bits can be written by simultaneous application of a moderate magnetic and a strong electric field.

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