Berlin 2012 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: FePt Nanoparticles (jointly with MA, MM – Organizer: Farle)

DS 12.5: Topical Talk

Monday, March 26, 2012, 17:00–17:30, EB 202

Atomistic characterisation of ultrahard nanomagnets — •Carolin Antoniak — Experimentalphysik/AG Wende and Center for Nanointegration Duisburg-Essen (CeNIDE), Universität Duisburg-Essen, Lotharstr. 1, 47057 Duisburg

A combination of x-ray absorption spectroscopy (XAS) and density functional theory (DFT) has been used to study the magnetic properties like spin and orbital magnetic moments and effective magnetocrystalline anisotropy of chemically ordered FePt nanoparticles on an atomistic lengthscale. By choosing the appropriate capping material, these properties can be tuned between hard and soft magnetic with either high or low magnetic moments [1]. Focus of this talk will be the results of XAS allowing for an element-specific analysis of magnetic properties. Complemented with DFT calculations, it helps to gain more insight to the mutual influence of nanoparticles and capping material allowing to state design guidelines for improved materials which will be presented in this contribution.

This work was done in collaboration with M.E. Gruner, M. Spasova, A. Rogalev, F. Wilhelm, A.V. Trunova, F.M. Römer, A. Warland, B. Krumme, K. Fauth, S. Sun, P. Entel, M. Farle, and H. Wende. We thank the HZB-BESSYII and ESRF staff as well as the staff of the Jülich Supercomputing Center, and P. Vezolle of IBM for their kind support. Funded by BMBF (05 ES3XBA/5), EU and DFG (SFB445, SPP1239)

[1] C. Antoniak, M.E. Gruner et al., Nature Comm. 2, 528 (2011)