ELFT HÍRADÓ

["Dezsi Istvan" <dezsi AT rmki.kfki.hu>]

      MEGHIVO
az RMKI CMRC szeminariumara, amelyet

Dr. Werner Schindler
(Institut fur Hochfrequenztechnik und Quantenelektronik,
Universitat Karlsruhe)
tart
"Electrodeposition versus MBE Growth of Ultrathin Magnetic Films and 
Nanostructures"
cimmel.
Helye: RMKI Tanacsterem
KFKI, 1121 Budapest, Konkoly Thege M. ut 29-33
III. epulet 2. emelet.
Ideje: 2003. marcius 31. hetfo, 14 ora.
Minden erdeklodot szivesen latunk.
Dezsi Istvan

Abstract:
The talk will give an overview of the growth of ultrathin films and 
low-dimensional nanostructures with electrodeposition and molecular beam 
epitaxy (MBE). Whereas ultrathin films can be prepared nicely with both 
techniques, there are certain restrictions in preparing nanostructures with 
evaporation techniques.

Electrodeposited ultrathin films are growing in very high quality on lattice 
matched substrates as seen by the pseudomorphic Co growth on Cu(111) which is 
found still beyond a film thickness of 10 ML. 
Using magnetic measurements and surface X-ray diffraction simultaneously, 
very important correlations between structure and magnetism can be found as 
for example the fcc-bcc phase transition in ultrathin Fe films which can be 
monitored in situ in dependence of the Fe film thickness. 

Single metallic and magnetic nanostructures can be favourably prepared by our 
electrochemical process of localized electrodeposition using the tip of a 
scanning probe microscope (SPM) as a nanoelectrode. Localized growth in 
evaporation processes is very difficult to achieve, and requires usually 
substrate superstructures like surface reconstructions. Additionally, since a 
solely electrochemical growth  avoids the formation of defects in the 
nanostructures, this process is best suited to generate nanostructures which 
show their intrinsic physical and chemical properties. However, whereas the 
investigation of ultrathin films can be done with well established integral 
techniques, in situ measurements on nanostructures are still a challenge for 
researchers, and with respect to magnetic properties at present not yet 
feasible.