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The Kondo effect in magnetic impurities and ferromagnetic contacts

By Hyunsoo Yang, See-Hun Yang, Grzegorz Ilnicki, Jan Martinek and Stuart S. P. Parkin

Abstract

Planar macroscopic magnetic tunnel junctions exhibit well defined zero bias anomalies when a thin layer of ferromagnetic CoFe(B) nanodots is inserted within a MgO based tunnel barrier. The conductance curves exhibit a single and a double peak, respectively, for anti-parallel and parallel alignment of the magnetizations of the electrodes which sandwich the tunnel barrier. This leads to a suppression of the tunneling magnetoresistance near zero bias. We show that the double peak structure indicates that the zero-bias anomaly is spin-split due to a magnetic exchange interaction between the magnetic nanodots and the ferromagnetic electrodes. Using a model based on an Anderson quantum dot coupled to ferromagnetic leads, we show that these results imply the coexistence of a Kondo effect and ferromagnetism.Comment: in press; Phys. Rev. B (2011

Topics: Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Year: 2011
OAI identifier: oai:arXiv.org:1104.3403
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