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TT: Tiefe Temperaturen

TT 9: Transport: Nanoelectronics III - Molecular Electronics

TT 9.5: Talk

Monday, March 27, 2006, 15:00–15:15, HSZ 304

Spin-dependent transport through individual carbon nanotubes — •Emiliano Pallecchi¹, Dominik Preusche¹, Elsa Thune¹, Benoit Witkamp², Alberto Morpurgo², and Christoph Strunk¹ — ¹Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Germany — ²Kavli Institute of Nanoscience, TU Delft, Netherlands

We report on experiments on carbon nanotubes (CNTs) with ferromagnetic contacts made from Pd_0.6Fe_0.4 alloys. The nanotubes and the micromagnetic properties of the contacts have been characterized by high resolution TEM and Lorentz-microscopy. We have performed low temperature magnetoconductance measurements on individually contacted CNTs as a function of gate voltage and magnetic field. From the weak localization effect in multiwall CNTs we get a signature of the band structure. The low field magnetoconductance shows a hysteretic switching behavior that we attribute to the magnetization reversal of the contacts. The amplitude of the low-field magnetoconductance varies strongly with gate voltage.