Dresden 2014 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session

MM 18.7: Poster

Montag, 31. März 2014, 18:00–20:00, P4

Influence of temperature on hydrogen induced surface modification on Gd(0001) islands — •Samuel Königshofen, Sara Wanjelik, and Mathias Getzlaff — Institute of Applied Physics, University of Düsseldorf

The adsorption of hydrogen on metal surfaces is of great interest in fundamental research and also applied science due to its importance for technology and material science. Although there has been research for many years, the subsequent hydride formation and especially their initial behavior is not completely understood yet. Here we present measurements, carried out by scanning tunneling microscopy, on gadolinium islands of 100-400 nm size and a few nanometers in height. The islands are grown on a W(110) surface. The initial stage of hydride formation and the localization of its occurrence will be of special interest. Further, the appearance and change of the hydrides due to heating of the sample has been observed. The steps of the temperature variation are in the range of a few hundred kelvin starting at room temperature. Additionally, the time dependence of the formation will be discussed. The known occurrence of disc-like island and formation of ramps on Gd thin films due to hydrogen adsorption will be compared to the investigated hydride characteristics of Gd islands.