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Supramolecular control of the magnetic anisotropy in two-dimensional high-spin Fe arrays at a metal interface

Gambardella, Pietro and Stepanow, Sebastian and Dmitriev, Alexandre and Honolka, Jan and de Groot, Frank MF and Lingenfelder, Magali and Sen Gupta, Subhra and Sarma, DD and Bencok, Peter and Stanescu, Stefan and Clair, Sylvain and Pons, Stephane and Lin, Nian and Seitsonen, Ari P and Brune, Harald and Barth, Johannes V and Kern, Klaus (2009) Supramolecular control of the magnetic anisotropy in two-dimensional high-spin Fe arrays at a metal interface. In: Nature Materials, 8 (3). pp. 189-193.

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Magnetic atoms at surfaces are a rich model system for solid-state magnetic bits exhibiting either classical(1,2) or quantum(3,4) behaviour. Individual atoms, however, are difficult to arrange in regular patterns(1-5). Moreover, their magnetic properties are dominated by interaction with the substrate, which, as in the case of Kondo systems, often leads to a decrease or quench of their local magnetic moment(6,7). Here, we show that the supramolecular assembly of Fe and 1,4-benzenedicarboxylic acid molecules on a Cu surface results in ordered arrays of high-spin mononuclear Fe centres on a 1.5nm square grid. Lateral coordination with the molecular ligands yields unsaturated yet stable coordination bonds, which enable chemical modification of the electronic and magnetic properties of the Fe atoms independently from the substrate. The easy magnetization direction of the Fe centres can be switched by oxygen adsorption, thus opening a way to control the magnetic anisotropy in supramolecular layers akin to that used in metallic thin films.

Item Type: Journal Article
Publication: Nature Materials
Publisher: Nature Publishing Group
Additional Information: Copyright of this article belongs to Nature Publishing Group.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 06 Nov 2009 07:36
Last Modified: 19 Sep 2010 05:28
URI: http://eprints.iisc.ac.in/id/eprint/19469

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