Co dimers on hexagonal carbon rings proposed as subnanometer magnetic storage bits.
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 available area density of magnetic recording by 3 orders of magnitude. As a model system, Co2 benzene with a diameter of 0.5 nm is investigated. It shows a magnetic anisotropy of the order of 0.1 eV per molecule, large enough to store permanently 1 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.
Xiao
Ruijuan
R
IFW Dresden e.V., Post Office Box 270116, D-01171 Dresden, Germany.
Fritsch
Daniel
D
Kuz'min
Michael D
MD
Koepernik
Klaus
K
Eschrig
Helmut
H
Richter
Manuel
M
Vietze
Knut
K
Seifert
Gotthard
G