Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.57: Poster

Freitag, 26. März 2010, 11:00–14:00, Poster B1

Fabrication of CNT-based devices for spin transport measurements — •Caitlin Morgan, Karin Goß, Carola Meyer, and Claus Michael Schneider — Institute of Solid State Research, Electronic Properties, Forschungszentrum Jülich, 52425 Jülich, Germany

Due to their excellent electronic properties, carbon nanotubes (CNTs) are a material of interest in future computing applications. CNTs have been shown to exhibit ballistic transport, which is interesting for quantum transport studies. Furthermore, small spin-orbit interactions and relatively few spin nuclei (13C) allow for slow spin relaxation through carbon nanotubes when electron spins are injected through ferromagnetic contacts, making CNTs interesting for the field of spintronics.

Contacting CNTs for spin-injection purposes has presented a challenge because of poor interfaces and high contact resistivity between carbon and most ferromagnetic materials. In this work, cobalt-palladium alloys were studied to determine an optimal material for ferromagnetic contacts to CNTs. The alloys were tested via atomic force microscopy (AFM), x-ray diffraction (XRD), x-ray reflectivity (XRR), and magneto-optic Kerr effect (MOKE) experiments. Samples of contacted CNTs have been fabricated for quantum transport and spin injection measurements, performed in a cryostat. Initial results are discussed. As a long-term goal, we hope to be able to do transport measurements, Raman spectroscopy, and transmission electron microscopy (TEM) all on one CNT in order to determine the effects of chirality or number of walls on a CNTs electronic properties.