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Strong Reduction of 1/f Noise by Carbon Doping in Epitaxial Fe/MgO(100) 12~ML/Fe Magnetic Tunnel Junctions with Barrier Defects

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Herranz D., Guerrero R., Cascales J., Aliev F., Hehn M.
Acta Physica Polonica A
|
2012
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vol. 121
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issue 5-6
981-984
EN
We report on the strong influence of carbon doping on 1/f noise in fully epitaxial Fe/MgO(100) 12 ML/Fe magnetic tunnel junctions in comparison with undoped junctions with a large density of barrier defects. Carbon influences the relaxation of defects, the reconstruction of the interface and the symmetry transformation of interface resonance states, which are suggested to contribute to the strong reduction of the 1/f noise. Our study demonstrates that doping with light elements could be a versatile tool to improve the electron transport and noise in epitaxial magnetic tunnel junctions with a large density of barrier defects.
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