Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 103: Transport: Poster Session

TT 103.16: Poster

Donnerstag, 19. März 2015, 15:00–18:00, Poster B

Magneto resistance measurements on ultra clean CNT devices with ferromagnetic contacts — •Michael Schafberger, Nicola Paradiso, Michael Görtler, Helmut Körner, Tobias Weindler, Matthias Kronseder, Andreas K. Hüttel, and Christoph Strunk — Institute of Exp. and Appl. Physics, University of Regensburg, Germany

Our goal is the realization of a spin-valve device based on ultra-clean single wall carbon nanotubes (SWNTs). In order to grant defect free and unperturbed SWNTs , chemical vapor deposition (CVD) growth is performed as last nanofabrication step. The achievement of ferromagnetic contacts that can sustain the CVD conditions remains to date elusive. We investigate bilayers of Rhenium and Cobalt (20/40 nm), which form an alloy during the CVD. The Re/Co contacts have been characterized by vibrating sample and SQUID magnetometry in order to demonstrate the persistence of ferromagnetic behavior after CVD. Optimized devices have then been used for transport measurements in the Coulomb blockade regime at 20 mK. The results of magneto-resistance experiments will be discussed together with recently proposed alternative fabrication approaches.