Volume 63, Number 5, September 2003
|Page(s)||729 - 735|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 November 2003|
Probing electron confinement in ultrathin metal films: From spin-polarized quantum-well states to surface resonances
Physikalisches Institut, Westfälische Wilhelms-Universität Münster Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany
Accepted: 27 June 2003
The unoccupied electron states of the sandwich structure have been investigated by spin- and angle-resolved inverse photoemission. Different types of electron states are clearly identified based on the spin-resolved data: spin-polarized quantum-well states within the layer, surface states and a surface resonance at the copper/vacuum interface, and bulk-like minority d contributions from the underlying ferromagnetic layer, which are accessible within the experimental probing depth. The quantum-well states are shown to develop into a surface resonance as a function of the electron momentum. Experimental evidence of this change in electron confinement is a vanishing exchange splitting. The loss of spin polarization is caused by a decoupling of the electron wave function from the ferromagnetic at the inner interface.
PACS: 73.21.Fg – Quantum wells / 75.70.Cn – Magnetic properties of interfaces (multilayers, superlattices, heterostructures) / 79.60.Dp – Adsorbed layers and thin films
© EDP Sciences, 2003
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