Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Surface Magnetism / Magnetic Imaging II
MA 31.3: Vortrag
Donnerstag, 25. März 2010, 15:45–16:00, H23
Magnetic order in the ultrathin iron film on the Ir(001) surface — •Frantisek Maca1, Josef Kudrnovsky1, Vaclav Drchal1, Ilja Turek2, and Josef Redinger3 — 1Institute of Physics ASCR, Praha — 2Institute of Physics of Materials ASCR, Brno — 3Vienna University of Technology, Vienna
We present detailed ab initio study of structural and magnetic stability of a Fe monolayer on the fcc(001) surface of iridium extending our last investigation [1]. The Fe monolayer has a strong tendency to order antiferromagnetically for the true relaxed geometry. We compare the influence of two adsorbate species on the magnetic ground state - H and O. We found that the adsorption of oxygen (contrary to the H) lowers the stability of antiferromagnetic order and prefers ferromagnetic ground state. The ferromagnetism is stabilized by the increased Fe-Ir layer spacing. The present study centers around the evaluation of pair exchange interactions between Fe atoms in the Fe overlayer as a function of adsorbate coverage which allows for a detailed understanding of the antiferromagnetism of a Fe/Ir(001) overlayer. Our calculations indicate that the nature of the true ground state could be more complex and display a spin spiral like rather than a c(2x2)-antiferromagnetic order. A comparison with recent experimental data [2] will be also given.
[1] J. Kudrnovsky, F. Maca, I. Turek, and J. Redinger, Phys. Rev. B 80, 064405 (2009).
[2] V. Martin at al., Phys. Rev. B 76, 205418 (2007).