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|Title:||Coexistence of the Kondo effect and a ferromagnetic phase in magnetic tunnel junctions|
|Authors:||Yang, H. |
|Source:||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. https://doi.org/10.1103/PhysRevB.83.174437|
|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|
|Appears in Collections:||Staff Publications|
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