Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-10-28
Physical Review B 79, 224420 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
16 pages with 14 figures
Scientific paper
10.1103/PhysRevB.79.224420
We analyze the stationary spin-dependent transport through a single-molecule magnet weakly coupled to external ferromagnetic leads. Using the real-time diagrammatic technique, we calculate the sequential and cotunneling contributions to current, tunnel magnetoresistance and Fano factor in both linear and nonlinear response regimes. We show that the effects of cotunneling are predominantly visible in the blockade regime and lead to enhancement of tunnel magnetoresistance (TMR) above the Julliere value, which is accompanied with super-Poissonian shot noise due to bunching of inelastic cotunneling processes through different virtual spin states of the molecule. The effects of external magnetic field and the role of type and strength of exchange interaction between the LUMO level and the molecule's spin are also considered. When the exchange coupling is ferromagnetic, we find an enhanced TMR, while in the case of antiferromagnetic coupling we predict a large negative TMR effect.
Barnas Jozef
Misiorny Maciej
Weymann Ireneusz
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