ELFT HÍRADÓ

[Erdelyi Zoltan <zerdelyi AT dragon.unideb.hu>]

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                           Debreceni Egyetem
                       Szilardtest Fizika Tanszek

                              SZEMINARIUM

                                idopont
                                -------
                  2009. januar 5., hetfo,  13:00 ora

                                Helyszin
                                --------
                         Debrecen, Bem ter 18/b.
                       Szilardtest Fizika Tanszek
                              Eloado terem

                                 Program
                                 -------

                        Reactions on top of the tip

                          Prof. Dr. Guido Schmitz

                       Institut für Materialphysi
                       Westf. Wilhelms-Univ. Münste
                              Münster, Germany


Down-scaling is a major principle of modern technology. Often, the 
introduction of nanostructured devices has led to an at least improved 
functionality, sometimes even to  new functional principles. However, the 
technical production and also the reliability of  such devices are 
controlled by solid state reactions that proceed on the range of a few 
nanometers only. On such a short length scale even basic aspects of 
reaction physics as fundamental as e.g. the Ficks laws of diffusion, need 
to be reconsidered.

In order to study reactions on a nanometer scale experimentally, only very 
few dedicated techniques are suitable. Among them, the atom probe 
tomography is exceptional, as it allows the detection and localization of 
individual atoms with an accuracy of a lattice constant. An almost 
complete reconstruction of the 3D atomic arrangement of different atomic 
species gets possible.

The talk provides an overview on recent topics on the reaction physics of 
nano-structured matter. After an introductory course presenting principles 
and current developments in atom probe tomography, physical mechanisms of 
solid state reactions are discussed in view of dedicated experiments at 
metallic thin film interfaces. How does nucleation of an interfacial 
product take place? What is the relation between early growth and the 
overall reaction kinetics? Does interfacial thermodynamics influence the 
stability of technical multilayers as they are used e.g. in GMR magnetic 
sensors? The atom probe tomography provides certainly new insights in 
these phenomena.


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