Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)

O 41.64: Poster

Tuesday, March 23, 2010, 18:30–21:00, Poster B1

Surface excitations of oxygen passivated Fe(001) — •Pavel Ignatiev, Yu Zhang, Khalil Zakeri, Valery Stepanyuk, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

Recent advances of spin polarized electron energy loss spectroscopy (SPEELS) [1] open up possibilities of simultaneous mapping of phonons and magnons on complex surfaces. This issues a challenge to reveal the properties of lattice dynamics, magnetic excitations and their couplings. We present a combined experimental and theoretical study of elementary excitations on the oxidized Fe(001) surface. Experimental measurements performed by means of SPEELS reveal 4 surface-related phonon branches and one magnon branch. Calculations of the force matrix from the ab initio input corroborate experimentally observed phonon dispersions. Special attention is paid to the phonons localized at oxygen atoms. Vertical vibrations of oxygen are accompanied by significant changes of the magnetic moment on the O atoms, which possibly can result in a magnon-phonon coupling.

[1] J. Prokop et al., Phys. Rev. Lett. 102, 177206 (2009).