The Kondo effect in ferromagnetic atomic contacts

M. Reyes Calvo, Joaquín Fernández-Rossier, Juan José Palacios, David Jacob, Douglas Natelson and Carlos Untiedt ()
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M. Reyes Calvo: Facultad de Ciencias, Universidad de Alicante, San Vicente del Raspeig, E-03790 Alicante, Spain
Joaquín Fernández-Rossier: Facultad de Ciencias, Universidad de Alicante, San Vicente del Raspeig, E-03790 Alicante, Spain
Juan José Palacios: Facultad de Ciencias, Universidad de Alicante, San Vicente del Raspeig, E-03790 Alicante, Spain
David Jacob: Rutgers University, Piscataway, New Jersey 08854, USA
Douglas Natelson: Rice University, Houston, Texas 77005, USA
Carlos Untiedt: Facultad de Ciencias, Universidad de Alicante, San Vicente del Raspeig, E-03790 Alicante, Spain

Nature, 2009, vol. 458, issue 7242, 1150-1153

Abstract: Shrinking magnets: a new spin on the Kondo effect Magnetism in metals such as iron is typically considered an intrinsic property of the material. But as with many physical effects, such general pictures can break down once you reduce the size of the system to the nanoscale. Calvo et al. report a striking manifestation of such a change: they find that when the diameter of a magnetic wire is reduced to atomic dimensions, the material's magnetic properties are strongly altered, to the point where magnetism can even be eliminated. This is an unexpected realization of the so-called Kondo effect, for which one usually requires two different species of atoms; it also highlights vividly the need to take into account atomic-scale geometry when investigating the properties of magnetic nanostructures.

Date: 2009
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DOI: 10.1038/nature07878

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