Transformation of spin information into large electrical signals via carbon nanotubes

Details Transformation of spin information into large electrical signals via carbon nanotubes Transformation of spin information into large electrical signals via carbon nanotubes

2005-11-29

arxiv.org/abs/cond-mat/0511697v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Content highly modified. New title, text, conclusions, figures and references. New author included

Scientific paper

Spin electronics (spintronics) exploits the magnetic nature of the electron, and is commercially exploited in the spin valves of disc-drive read heads. There is currently widespread interest in using industrially relevant semiconductors in new types of spintronic devices based on the manipulation of spins injected into a semiconducting channel between a spin-polarized source and drain. However, the transformation of spin information into large electrical signals is limited by spin relaxation such that the magnetoresistive signals are below 1%. We overcome this long standing problem in spintronics by demonstrating large magnetoresistance effects of 61% at 5 K in devices where the non-magnetic channel is a multiwall carbon nanotube that spans a 1.5 micron gap between epitaxial electrodes of the highly spin polarized manganite La0.7Sr0.3MnO3. This improvement arises because the spin lifetime in nanotubes is long due the small spin-orbit coupling of carbon, because the high nanotube Fermi velocity permits the carrier dwell time to not significantly exceed this spin lifetime, because the manganite remains highly spin polarized up to the manganite-nanotube interface, and because the interfacial barrier is of an appropriate height. We support these latter statements regarding the interface using density functional theory calculations. The success of our experiments with such chemically and geometrically different materials should inspire adventure in materials selection for some future spintronics

Affiliated with

Also associated with

No associations

Rating

Transformation of spin information into large electrical signals via carbon nanotubes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Transformation of spin information into large electrical signals via carbon nanotubes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transformation of spin information into large electrical signals via carbon nanotubes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-716179