Regensburg 2010 – wissenschaftliches Programm
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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 41.88: Poster
Dienstag, 23. März 2010, 18:30–21:00, Poster B1
Paramagnetic Y(0001) as a model for ferromagnetic Gd(0001) — •Sebastian D. Stolwijk, Anke B. Schmidt, and Markus Donath — Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany
Yttrium and gadolinium are isoelectronic elements with respect to their valence bands but differ in their magnetic properties due to the additional 4f electrons in Gd. Therefore, Y may be viewed as paramagnetic model for ferromagnetic Gd. A comparative study of the electronic structure of Y and Gd promises to reveal electronic properties that are directly linked to ferromagnetism.
We determined the surface electronic structure in the vicinity of the Fermi level EF by a combined direct (PE) and inverse photoemission (IPE) experiment. Our study on clean Y(0001) films on W(110) reveals a surface state right at EF, which is observed both below and above the Fermi level. High-resolution IPE measurements and results on the stable p(1× 1)O/Y(0001) surface oxide expose an additional spectral feature at about 0.6 eV above EF. Based on bulk-band structure calculations this emission is ascribed to the band edge of Y(0001). The possible observation of a band-edge emission for Gd(0001) sheds new light on the interpretation of its spin-dependent electronic structure [1]. Implications for the understanding of the ferromagnetic Gd(0001) surface will be discussed.
[1] M. Donath et al., Phys. Rev. Lett. 77, 5138 (1996).