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O: Fachverband Oberflächenphysik

O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)

O 27.82: Poster

Dienstag, 24. März 2009, 18:30–21:00, P2

Spin-resolved inverse photoemission experiments on Ni/GaAs(001) — •Christian Eibl, André Berken, Manuel Prätorius, Anke B. Schmidt, and Markus Donath — Physikalisches Institut, Westfälische Wilhelms-Universität Münster

To understand the interplay between crystal structure, electronic states, and magnetism, it is worthwhile to compare the different ferromagnetic elements. Unfortunately, the thermodynamically stable crystal structures of Ni, Fe, and Co are face-centered cubic (fcc), body-centered cubic (bcc), and hexagonal close-packed (hcp), respectively. Thus, a direct comparison is hampered and scientists endeavor to crystallize Fe, Co, and Ni in a non-native structure.

Recently, it was shown by Tian et al. that Ni can be stabilized in the bcc structure on a GaAs(001) substrate. In contrast to the fcc structure, it was found that bcc Ni exhibits different magnetic properties, e.g., Curie temperature and magnetic anisotropy. Additionally, a photoemission experiment revealed differences in the electronic structure below the Fermi level [1].

To gain further insight into the electronic structure of bcc Ni also above the Fermi level, we used spin-resolved inverse photoemission to investigate Ni films on GaAs(001) as a function of thickness. Furthermore, we compared our results with measurements on fcc Ni/Cu(001).

[1] C.S. Tian et al., Phys. Rev. Lett. 94, 137210 (2005)