Dresden 2011 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 40: Surface magnetism II (jointly with O)
MA 40.6: Talk
Wednesday, March 16, 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)