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Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 22: Magnetic Particles / Clusters II

MA 22.9: Talk

Wednesday, February 27, 2008, 16:00–16:15, H 1028

Chemical trends in structure and magnetism of binary multiply twinned nanoparticles — •Markus Ernst Gruner, Antje Dannenberg, and Peter Entel — Fachbereich Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany

Arrays of L10 ordered nanoparticles of near-stoichiometric FePt and CoPt with diameters down to 4 nm are considered as promising material for future ultra-high density recording media. However, with decreasing particle size, also multiply twinned structures like decahedra and icosahedra are frequently encountered in experiment (e. g., [1]). These structures, however, will not posses the required hard magnetic properties due to the different crystallographic orientations of the individual twins. Recent large scale ab initio calculations of FePt clusters with up to 2.5 nm in diameter [2] show that ordered multiply twinned structures are energetically preferred over L10 cuboctahedra. Within this contribution, we discuss from the electronic structure point of view the influence of chemical trends on the structural stability of the L10 phase obtained by variation of the 3d and the 5d element.

[1] Z. R. Dai et al., Surf. Sci. 505, 325 (2002); D. Sudfeld et al., Mater. Res. Soc. Symp. Proc. 998E, 0998-J01-06 (2007)

[2] M. E. Gruner, G. Rollmann, P. Entel, M. Farle (submitted)

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