Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 58: Spintronics II (jointly with TT, HL)
MA 58.6: Talk
Thursday, March 17, 2011, 18:30–18:45, HSZ 401
Ferromagnetically contacted carbon nanotubes for spin injection — •Caitlin Morgan1,2, Klaus Schmalbuch2,3, Carola Meyer1,2, and Claus Michael Schneider1,2 — 1Forschungszentrum Jülich, Peter Grünberg Institute 7, 52425 Jülich, Germany — 2JARA Jülich Aachen Research Alliance, 52425 Jülich, Germany — 3Physikalisches Institut, RWTH Aachen University, Otto-Blumenthal-Straße, 52074 Aachen, Germany
In addition to exhibiting ballistic transport, carbon nanotubes (CNTs) have small spin-orbit interactions and relatively few spin nuclei (13C). These properties suggest a long spin relaxation length in CNTs, giving them a potential application in the field of spintronics.
We study spin injection in CNT-based devices. Samples are fabricated via chemical vapor deposition growth of CNTs onto lithographically prepatterned substrates. The CNTs are then contacted by ferromagnetic leads to form 2 and 4 terminal devices for spin injection. Special attention has been given to choosing a ferromagnetic material and shape for contacts. Permalloy and Co-based alloys have been studied in order to find a material with good magnetic properties that also forms a stable electronic interface with CNTs. SQUID and X-ray measurements of thin films were used to select good material systems. The shape and size of the contacts have been optimized to have only one in-plane magnetic domain. SQUID and atomic/magnetic force microscopy were used to study the magnetic properties of nanocontacts. Magnetoresistance measurements of contacted CNT samples are shown and discussed.