Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 23: Micro- and Nanostructured Magnetic Materials III

MA 23.9: Talk

Thursday, March 25, 2010, 12:15–12:30, H3

Kondo effect in magnetic nanocontacts — •David Jacob — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle

We present LDA+DMFT calculations of the electronic structure and coherent transport properties of nanocontacts containing magnetic atoms (Fe,Co or Ni) in the contact region [1]. The strong electron correlations of the 3d-electrons are fully taken into account by combining Density Functional Theory (DFT) calculations of the nanocontact with a dynamical treatment of the 3d-shells of the magnetic atoms by the Dynamical Mean-Field Theory (DMFT) within the so-called One-Crossing-Approximation (OCA). We find that the strong electron correlations can give rise to Kondo resonances at the Fermi level which in turn lead to Fano lineshapes in the coherent transport characteristics of the nanocontact. The exact shape of the Kondo-Fano lineshapes depends on the type of magnetic atoms and the geometry of the contact in agreement with recent experiments with magnetic nanocontacts [2].

References: [1] D. Jacob et al., Phys. Rev. Lett. 103, 016803 (2009). [2] M. R. Calvo et al., Nature 458, 1150 (2009).