Navigation Links
Graphite mimics iron's magnetism
Date:10/4/2009

Researchers of Eindhoven University of Technology and the Radboud University Nijmegen in The Netherlands show for the first time why ordinary graphite is a permanent magnet at room temperature. The results are promising for new applications in nanotechnology, such as sensors and detectors. In particular graphite could be a promising candidate for a biosensor material. The results will appear online on 4 October in Nature Physics.

Graphite is a well-known lubricant and forms the basis for pencils. It is a layered compound with a weak interlayer interaction between the individual carbon (graphene) sheets. Hence, this makes graphite a good lubricant.

Unexpected

It is unexpected that graphite is ferromagnetic. The researchers Jiri Cervenka and Kees Flipse (Eindhoven University of Technology) and Mikhail Katsnelson (Radboud University Nijmegen) demonstrated direct evidence for ferromagnetic order and explain the underlying mechanism. In graphite well ordered areas of carbon atoms are separated by 2 nanometer wide boundaries of defects. The electrons in the defect regions (the red/yellow area in picture 1) behave differently compared to the ordered areas (blue in picture 1), showing similarities with the electron behaviour of ferromagnetic materials like iron and cobalt.

Debate settled

The researchers found that the grain boundary regions in the individual carbon sheets are magnetically coupled, forming 2-dimensional networks (picture 2). This interlayer coupling was found to explain the permanent magnetic behaviour of graphite. The researchers also show experimental evidence for excluding magnetic impurities to be the origin of ferromagnetism, ending ten years of debate.

Carbon in spintronics

Surprisingly, a material containing only carbon atoms can be a weak ferro magnet. This opens new routes for spintronics in carbon-based materials. Spins can travel over relative long distances without spin-flip scattering and they can be flipped by small magnetic fields. Both are important for applications in spintronics. Carbon is biocompatible and the explored magnetic behaviour is therefore particularly promising for the development of biosensors.


'/>"/>

Contact: Kees Flipse
C.F.J.Flipse@tue.nl
31-402-474-118
Eindhoven University of Technology
Source:Eurekalert  

Related biology technology :

1. New graphene-based material clarifies graphite oxide chemistry
2. Biochip mimics the body to reveal toxicity of industrial compounds
3. New adhesive mimics gecko toe hairs
4. New MIT radio chip mimics human ear
5. Researchers use magnetism to target cells to animal arteries
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Graphite mimics iron's magnetism
(Date:5/2/2016)... ... ... StarNet Communications Corp, ( http://www.starnet.com/ ) a leading publisher of remote Linux ... to its flagship X-Win32 PC X server. The new modules enable X-Win32 to ... over encrypted SSH. , Traditionally, users of PC X servers deploy the XDMCP protocol ...
(Date:4/29/2016)... , April 29, 2016 ... by Transparency Market Research "Separation Systems for Commercial ... Growth, Trends, and Forecast 2015 - 2023", the ... at US$ 10,665.5 Mn in 2014 and is ... from 2015 to 2023 to reach US$ 19,227.8 ...
(Date:4/28/2016)... , April 28, 2016 The ... and Brayton Cryocoolers), Service (Technical Support, Product Repairs & ... - Global Forecast to 2022", published by MarketsandMarkets, the ... Billion by 2022, at a CAGR of 7.29% between ... data Tables and 94 Figures spread through 159 Pages ...
(Date:4/28/2016)... ... April 28, 2016 , ... Morris Midwest ( ... for regional manufacturers at its Maple Grove, Minnesota technical center, May 11-12. ... and Trumpf. Almost 20 leading suppliers of tooling, accessories, software and other ...
Breaking Biology Technology:
(Date:4/26/2016)... India and LONDON ... Infosys Finacle, part of EdgeVerve Systems, a product ... and Onegini today announced a partnership to integrate ... solutions.      (Logo: http://photos.prnewswire.com/prnh/20151104/283829LOGO ... to provide their customers enhanced security to access ...
(Date:4/19/2016)... The new GEZE SecuLogic access ... "all-in-one" system solution for all door components. It can ... door interface with integration authorization management system, and thus ... minimal dimensions of the access control and the optimum ... offer considerable freedom of design with regard to the ...
(Date:4/15/2016)... , April 15, 2016 ... the,  "Global Gait Biometrics Market 2016-2020,"  report to ... http://photos.prnewswire.com/prnh/20160330/349511LOGO ) , ,The global gait biometrics ... of 13.98% during the period 2016-2020. ... angles, which can be used to compute factors ...
Breaking Biology News(10 mins):