Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 2: Magnetic Particles/Clusters I
MA 2.7: Vortrag
Montag, 26. März 2007, 11:45–12:00, H10
Magnetic anisotropy of two-dimensional Co nanostructures deposited on the Pt(111) surface — •Sven Bornemann1, Jan Minar1, Julie Staunton2, and Hubert Ebert1 — 1Department Chemie, LMU München, Germany — 2Department of Physics, University of Warwick, United Kingdom
In recent years, magnetic nanostructures on surfaces have been the subject of intense research activities which are driven by fundamental as well as practical interests. One of the central questions for future applications is how the magnetic properties like magnetic moments, exchange coupling and magnetic anisotropy evolve in between single magnetic adatoms and submonolayer magnetic particle arrays.
We applied the fully relativistic spin-polarized KKR method to investigate the magnetic anisotropy energy (MAE) of a variety of Co clusters deposited on the Pt(111) surface. Hereby, we focussed on the evolution of the MAE and other magnetic properties and their convergence to the corresponding monolayer values when going from a single Co adatom to nanostructures with more than 100 atoms. Furthermore we also studied how the MAE will change by introducing heteroatoms like Fe or Ru at the perimeter of these Co structures. All MAE results were obtained by calculating the magnetic torque directly from the electronic structure rather than taking energy differences. We resolved the MAE contributions for inequivalent atoms and will discuss the effect of the induced MAE within the Pt substrate.