title: Temperature dependence of the giant magnetoresistance in Fe/DNA/Fe structure.
abstract: A numerical study is presented to investigate the spin-dependent transport through poly(dG)-poly(dC) DNA molecule sandwiched between ferromagnetic contacts in the absence and in the presence of environmental effects. Making use of tight-binding procedure and within the framework of a generalized Green's function technique, the room temperature current-voltage characteristics of DNA molecule and the giant magnetoresistance (GMR) of Electrode/DNA/Electrode structure, with iron (Fe) as the electrode are studied. It is found that the GMR to be lower than 12% for small applied bias and about 35% for applied bias larger than 2.5 volts. Considering the environmental effects, the GMR would be increased up to 13% at a bias lower than 2 volts and decreases up to 23% for the bias about 2.5 volts. In addition, our calculations indicate that for applied biases around 2.5 volts, the GMR decreases when the temperature increased.
authors.affiliation: School of Physics, Damghan University of Basic Sciences, Damghan 3671641167, Iran.
authors.forename: S A
authors.initials: SA
authors.lastname: Ketabi
authors.forename: S G
authors.initials: SG
authors.lastname: Bahoosh
authors.forename: N
authors.initials: N
authors.lastname: Shahtahmasebi
mesh_terms: D004247:DNA / Q000737:chemistry*; D004566:Electrodes; D007501:Iron / Q000737:chemistry*; D008280:Magnetics / Q000295:instrumentation / Q000379:methods*; D013696:Temperature; D013816:Thermodynamics
chemical_list: D004247:DNA; D007501:Iron