Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 13: Magnetismus

O 13.2: Vortrag

Freitag, 4. März 2005, 16:00–16:15, TU EB107

Quantum-Well States and Spin Polarization in Ni/Cu Thin-Film Structures — •Volker Renken, Dehong Yu, Georgi Rangelov, and Markus Donath — Physics Institute, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany

Spin- and angle-resolved inverse photoemission was used to study the unoccupied quantum-well states in ultrathin Ni films on Cu(001). Three quantum-well features are clearly resolved that disperse to higher energies with increasing Ni overlayer thickness. The transition from two- to three-dimensional behaviour is followed by observing the bulk sp-band being formed from discrete quantum-well states. The dispersion of the quantum-well states as a function of the wave vector parallel to the surface agrees well with the corresponding sp-band dispersion. Our results are discussed in comparison with results for Co on Cu(001) [1] with respect to energy dependence and magnetic exchange splitting.

[1] Yu et al., Phys. Rev. B 68 (2003) 155415.