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Title: Coexistence of the Kondo effect and a ferromagnetic phase in magnetic tunnel junctions
Authors: Yang, H. 
Yang, S.-H.
Ilnicki, G.
Martinek, J.
Parkin, S.S.P.
Issue Date: 23-May-2011
Citation: Yang, H., Yang, S.-H., Ilnicki, G., Martinek, J., Parkin, S.S.P. (2011-05-23). Coexistence of the Kondo effect and a ferromagnetic phase in magnetic tunnel junctions. Physical Review B - Condensed Matter and Materials Physics 83 (17) : -. ScholarBank@NUS Repository.
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 antiparallel and parallel alignment of the magnetizations of the electrodes that 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. © 2011 American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
ISSN: 10980121
DOI: 10.1103/PhysRevB.83.174437
Appears in Collections:Staff Publications

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