Diode effect in magnetic tunnel junctions

Details Diode effect in magnetic tunnel junctions Diode effect in magnetic tunnel junctions

2004-12-14

arxiv.org/abs/cond-mat/0412351v1

Physics

Condensed Matter

Other Condensed Matter

8 pages, 5 figures

Scientific paper

The influence on the I-V characteristics and tunnel magnetoresistance (TMR), of impurities embedded into the insulating barrier I separating the two ferromagnetic electrodes F of a magnetic tunnel junction, was theoretically investigated. When the energy of the electron's bound state at the impurity site is close to the Fermi energy, it is shown that the current and TMR are strongly enhanced in the vicinity of the impurity. If the position of the impurity inside the barrier is asymmetric, e.g. closer to one of the interfaces F/I, the I-V characteristic exhibits a quasidiode behavior. The case of a single impurity and of a random distribution of impurities within a plane were both studied.

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