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

By Ruijuan Xiao, Daniel Fritsch, Michael D. Kuz'min, Klaus Koepernik, Helmut Eschrig, Manuel Richter, Knut Vietze and Gotthard Seifert

Abstract

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.Comment: 13 pages, 4 figure

Topics: Condensed Matter - Materials Science, Condensed Matter - Other Condensed Matter
Publisher: 'American Physical Society (APS)'
Year: 2009
DOI identifier: 10.1103/PhysRevLett.103.187201
OAI identifier: oai:arXiv.org:0906.4645

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