Nanotechnology Now





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > What makes nanowires so attractive

Abstract:
For a Chinese-German research team the "force of attraction" of minute nanowires is not only based on their special scientific interests: Physicists of the Chinese University of Hongkong and the Friedrich Schiller University Jena were able to prove for the first time that cobalt doped nanowires made from zinc oxide have intrinsic ferromagnetic characteristics - and therefore in principle work like tiny bar magnets. The scientists around Prof. Dr. Quan Li (Hong Kong) and Prof. Dr. Carsten Ronning (Jena) will publish the results of their research in the current online edition of the well renowned journal "Nature Nanotechnology."

What makes nanowires so attractive

China and Germany | Posted on July 15th, 2009

For that Prof. Ronning and his Jena team used their know-how about the preparation of semiconductor nanostructures and their optical characteristics, and doped zinc oxide wires. These were then examined for their magnetic properties by the Chinese colleagues around Prof. Li - an acknowledged expert in the field of electron microscopy. The innovative combination of two analytical methods - transmission electron microscopy and electron magnetic chiral dichroism - is responsible for the surprising outcome. "We realized that cobalt doping gives intrinsic ferromagnetic properties while iron does not", comments Prof. Li. Further investigations must now clarify where these differences come from.

The production of magnetic semiconducting nanowires has so far been basic research, as Quan Li emphasizes. But medium term "we might be able to help push open the door to spintronics." "Spintronics" is a new field in semiconductor physics: While traditional semiconductor electronics is based on the electrons' electrical charge, spintronics additionally uses the spin, the angular momentum, of the electrons. "That momentum can occur in two directions resulting in a magnetic moment," explains Prof. Ronning.

This new development could bring real advantages: Common electronic components need 10,000 to 100,000 electrons for a single switching action. Semiconductor components switching only the spin of electrons need only one electron to transport the necessary information. "That means that spintronic semiconductors could switch much faster than common electronic components", says Quan Li. Furthermore they would need only a fraction of the energy.

The precondition for a further development of spintronics however is, that semiconductors with intrinsic ferromagnetic characteristics can be produced at all. Intense worldwide research has been conducted for about a decade - so far with moderate success: There has not been a method clearly proving intrinsic ferromagnetism so far. Thanks to the current results the physicists have taken the field an important step further.

The original publication Z. H. Zhang, Xuefeng Wang, J. B. Xu, S. Muller, C. Ronning & Quan Li. Evidence of intrinsic ferromagnetism in individual dilute magnetic semiconducting nanostructures can be found under: www.nature.com/doifinder/10.1038/nnano.2009.181

####

About 7thSpace
7thSpace is an online portal covering many different topics. Whether you're a business owner, webmaster, or just looking for some fun - we have something to offer for everybody.

For more information, please click here

Contacts:
Prof. Dr. Quan Li
Department of Physics, The Chinese University of Hong Kong
Phone: + (852) 2609 6323

www.phy.cuhk.edu.hk/qli/

Prof. Dr. Carsten Ronning
Institute for Solid State Physics, Friedrich Schiller University Jena
Phone: + (49) 3641 947300

www.nano.uni-jena.de/en

Copyright © 7thSpace

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Clues to inner atomic life from subtle light-emission shifts: Hyperfine structure of light absorption by short-lived cadmium atom isotopes reveals characteristics of the nucleus that matter for high precision detection methods July 3rd, 2015

Pioneering Southampton scientist awarded prestigious physics medal July 3rd, 2015

Groundbreaking research to help control liquids at micro and nano scales July 3rd, 2015

Discovery of nanotubes offers new clues about cell-to-cell communication July 2nd, 2015

Possible Futures

Groundbreaking research to help control liquids at micro and nano scales July 3rd, 2015

Harris & Harris Group Portfolio Company D-Wave Systems Announces 1,000 Qubit Processor and is Discussed in the Economist June 23rd, 2015

Global Nanoclays Market Analysis, Size, Growth, Trends And Segment Forecasts, 2015 To 2022: Grand View Research, Inc June 15th, 2015

Healthcare Nanotechnology (Nanomedicine) Market Size To 2020 June 5th, 2015

Spintronics

Influential Interfaces Lead to Advances in Organic Spintronics July 1st, 2015

Emergence of a 'devil's staircase' in a spin-valve system July 1st, 2015

Spintronics advance brings wafer-scale quantum devices closer to reality June 24th, 2015

Solvent encapsulation is the trick: a solid material with spin-transition solution-like behaviour June 5th, 2015

Discoveries

Clues to inner atomic life from subtle light-emission shifts: Hyperfine structure of light absorption by short-lived cadmium atom isotopes reveals characteristics of the nucleus that matter for high precision detection methods July 3rd, 2015

Groundbreaking research to help control liquids at micro and nano scales July 3rd, 2015

Producing spin-entangled electrons July 2nd, 2015

NIST Group Maps Distribution of Carbon Nanotubes in Composite Materials July 2nd, 2015

Announcements

Clues to inner atomic life from subtle light-emission shifts: Hyperfine structure of light absorption by short-lived cadmium atom isotopes reveals characteristics of the nucleus that matter for high precision detection methods July 3rd, 2015

Pioneering Southampton scientist awarded prestigious physics medal July 3rd, 2015

Groundbreaking research to help control liquids at micro and nano scales July 3rd, 2015

NIST Group Maps Distribution of Carbon Nanotubes in Composite Materials July 2nd, 2015

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project