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:2/16/2017)... ... February 16, 2017 , ... Avomeen & MichBio will ... event will be held at Avomeen Analytical Services (4840 Venture Dr., Ann Arbor, Michigan ... organization. They provide an opportunity to interact with peers, make new connections and talk ...
(Date:2/16/2017)... , Feb. 16, 2017 Research ... "Synthetic Biology: Global Markets" report to their offering. ... ... (synthetic genes, biobrick parts, delivery plasmids, chassis organisms, synthetic ... and assembly, genome editing, bioinformatics and specialty media) and ...
(Date:2/16/2017)... 16, 2017  Dermata Therapeutics, LLC, a biotechnology ... a variety of dermatological diseases, today announced it ... and entered into a $5 million credit facility ... use the capital for general corporate purposes to ... the treatment of serious diseases treated by dermatologists. ...
(Date:2/16/2017)... NEW YORK , Feb. 16, 2017 ... $7M Series B financing, adding an additional $3M from ... by Mesa Verde Venture Partners and other strategic partners ... directed towards further accelerating commercial adoption of their flagship ... test and expanding the Paradigm cancer registry. ...
Breaking Biology Technology:
(Date:2/6/2017)... According to Acuity Market Intelligence, ongoing ... to continue to embrace biometric and digital identification ... Border Control (ABC) eGates and 1436 Automated Passport ... 163 ports of entry across the globe. Deployments ... combined CAGR of 37%. APC Kiosks reached 75% ...
(Date:2/2/2017)... , Feb. 2, 2017  EyeLock LLC, a market ... new white paper " What You Should Know About ... of ensuring user authenticity is a growing concern. In ... of users. However, traditional authentication schemes such as username/password ... Biometric authentication offers an elegant solution to the ...
(Date:1/30/2017)...   Invitae Corporation (NYSE: NVTA ... today announced that it will report its fourth quarter ... on Monday, February 13, 2017, and Invitae,s management team ... p.m. Eastern / 1:45 p.m. Pacific. ... financial results, guidance, and recent developments and will spend ...
Breaking Biology News(10 mins):