Current and power spectrum in a magnetic tunnel device with an atomic size spacer

Details Current and power spectrum in a magnetic tunnel device with an atomic size spacer Current and power spectrum in a magnetic tunnel device with an atomic size spacer

2000-03-27

arxiv.org/abs/cond-mat/0003418v1

Phys. Rev. B 62, 1186 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 4 figures

Scientific paper

10.1103/PhysRevB.62.1186

Current and its noise in a ferromagnetic double tunnel barrier device with a small spacer particle were studied in the framework of the sequential tunneling approach. Analytical formulae were derived for electron tunneling through the spacer particle containing only a single energy level. It was shown that Coulomb interactions of electrons with a different spin orientation lead to an increase of the tunnel magnetoresistance. Interactions can also be responsible for the negative differential resistance. A current noise study showed, which relaxation processes can enhance or reduce fluctuations leading either to a super-Poissonian or a sub-Poissonian shot noise.

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