Researchers at Eindhoven University of Technology showed 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 biosensors and detectors. The findings were published online 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.
It was 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 behave differently compared to the ordered areas showing similarities with the electron behavior of ferromagnetic materials like iron and cobalt.
The researchers found that the grain boundary regions in the individual carbon sheets are magnetically coupled, forming 2-dimensional networks. This interlayer coupling was found to explain the permanent magnetic behavior of graphite. The researchers also show experimental evidence for excluding magnetic impurities to be the origin of ferromagnetism, ending ten years of debate.
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 behavior is therefore particularly promising for the development of biosensors.
The paper in Nature Physics “ Room-temperature ferromagnetism in graphite driven by 2D networks of point defects” by Jiri Cervenka, Mikhail Katsnelson and Kees Flipse appeared online Sunday 4 October, 7:00 pm CET. The paper can be found under DOI 10.1038/NPHYS1399. The research was funded by Nanoned and FOM.
