Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Surface magnetism II (jointly with MA)
O 55.6: Vortrag
Mittwoch, 16. März 2011, 16:15–16:30, CHE 184
Quantum-well-states in a copper/cobalt/copper hetero-structure — •Philipp Kloth1, Martin Wenderoth1, Henning Prüser1, Alexander Weismann2, and Rainer G. Ulbrich1 — 1IV. physikalisches Institut, Georg-August Universität Göttingen, 37077 Göttingen — 2IEAP, Christian-Albrechts-Universität zu Kiel, 24098 Kiel
The morphological and electronic properties of a copper/cobalt/copper hetero-structure have been investigated by LEED, AES and STM/STS. We focus on the structural dependent electronic features, that could be observed for different preparation methods.
The samples are prepared and analyzed under UHV-conditions. Cobalt and copper films are deposited onto a (100)-copper single crystal by electron beam evaporation. The growth of both materials at room and LN2 temperature with a subsequent annealing step reveals different surface morphology. Furthermore a considerable diffusion between the interfaces takes place during the deposition process - even at low temperatures.
Due to the finite thickness of just a few monolayers the copper film on top of the sample exhibits the formation of quantum-well-states which can be identified by STS. The crossover to smoother hetero-structures by growing at low temperatures leads to a change in the energetic behaviour of those states. This is explained by the anisotropic electron propagation of copper [1]. This work is supported by the SFB 602 TP A3.
[1] A. Weismann et al., Science 323, 1190 (2009)