Regensburg 2007 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 20: Magnetic Thin Films II

MA 20.12: Vortrag

Mittwoch, 28. März 2007, 18:00–18:15, H5

Spin-dependence of the Ni d-band transition in inverse photoemission on ultrathin Ni films on Cu(001) — •Volker Renken and Markus Donath — Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany

Ultrathin Ni films on Cu(001) represent one of the most studied magnetic thin-film systems. The spin-dependent bulk band structure of Ni(001) shows that only minority d-bands exist above the Fermi level, while the majority d-bands are completely occupied. This makes Ni a strong ferromagnet. Consequently, spin- and angle-resolved inverse photoemission measurements of Ni(001) and of thick Ni films on Cu(001) show a spectral feature just above the Fermi level, which results from transitions into the unoccupied d-bands and appears for minority spin only. In contrast, for ultrathin Ni films on Cu(001) the corresponding spectral feature appears for both minority spin and majority spin. At this, the spectral feature resulting from the d-bands is affected by several factors, which are discussed within this talk: the influence of the Cu(001) substrate, additional quantum-well states, a reduced magnetization in thin films and at room temperature, a change of the magnetic anisotropy, and a two-dimensional band structure which is different from the bulk one.