Journal
PHYSICAL REVIEW B
Volume 79, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.224420
Keywords
exchange interactions (electron); molecular magnetism; shot noise; spin polarised transport; tunnelling magnetoresistance
Funding
- Ministry of Science and Higher Education
- EC Sixth Framework Programme [ERAS-CT-2003-980409]
- Adam Mickiewicz University Foundation
- Foundation for Polish Science
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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.
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