Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Surface Magnetism

MA 28.3: Vortrag

Donnerstag, 29. März 2007, 15:45–16:00, H23

Spin- and angle-resolved inverse photoemission of h-BN/Ni(111) — •Karen Zumbrägel¹, Christian Eibl¹, Kathrin Wulff¹, Matthias Hengsberger², and Markus Donath¹ — ¹Physikalisches Institut, Westfälische Wilhelms-Universität, Münster, Germany — ²Physik-Institut, Universität Zürich, Switzerland

There is great interest in ultrathin insulating films on metal surfaces. One example, which has been already studied in some detail [1, 2], is boron nitride on Ni(111). A monolayer of hexagonal boron nitride (h-BN) is formed in a reaction of borazine (HBNH)₃ with the hot Ni(111) surface. The ferromagnetic Ni(111) surface as well as the bulk insulator boron nitride are well-studied systems. We added new information about the unoccupied electronic structure of h-BN/Ni(111) by performing spin- and angle-resolved inverse photoemission experiments. We detected four spectral features: A nickel bulk state at 0.1 eV, two BN-interface-states at 1.7 eV and 2.2 eV and an image-potential surface state at 3.0 eV above the Fermi level. For the interface states, we determined their spin splitting and their energy dispersion E(k_||) with the corresponding effective mass. Our results are discussed in the context of theoretical and experimental work available in the literature.

[1] W. Auwärter, T.J. Kreutz, T. Greber, J. Osterwalder, Surf. Sci. 429, 229 (1999) [2] G.B. Grad, P. Blaha, K. Schwarz, W. Auwärter and T. Greber, Phys. Rev. B 68, 085404 (2003)