Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Poster Monday: Nanostructures

O 18.9: Poster

Montag, 1. April 2019, 17:45–20:00, Poster F

Forming and contacting chains of Fe and Co nanoclusters for four-probe transport measurements — •Oleg Kurnosikov¹ and Kongyi Li² — ¹Eindhoven University of Technology, Eindhoven, The Netherlands — ²QuTech, Delft University of Technology, Delft, The Netherlands

Electron transport along a chain of nanoclusters can be governed by a single-electron charge, spin or quantum phenomena as soon the size of the nanoclusters is in the order of several or tens nanometers. To fabricate such system aiming at spin transport we arrange the chains of small Fe and Co nanoclusters on an ultra-thin AlOx layer. Within our approach, the thin oxide layer decouples the electronic states of the nanoclusters from a conductive substrate. Iron and cobalt nanoclusters were obtained by MBE growth at controlled temperature in UHV. The arrangement of the clusters in chains is achieved by exploiting a preferable nucleation along the structural defects of AlOx or, alternatively, by relocation of the individual nanoclusters with the STM tip. However, a direct contacting the chains of nanoclusters for current transport measurements with the four-probes method is not trivial since the contacting process becomes destructive on this scale both for the clusters and thin alumina layer. To solve the problem of 4-probe contacting to the chain we introduced auxiliary gold islands of bigger size mediating the contacts with four probes. Various ways of formation of the gold islands providing the reliable contacts have been tried.