Tunnel magnetoresistance of biphenyl molecular junction: Effects of molecular conformation

Effect of molecular conformation on the spin-dependent transport of FM/biphenyl/FM model junction, inwhich a biphenyl molecule attached to ferromagnetic (FM) electrodes is numerically investigated. The work is basedon a tight-binding Hamiltonian model within the framework of a generalized Green's function method and relies on theLandauer-Büttiker formalism. We have found that spin-dependent transport characteristics, including the current andtunnel magnetoresistance (TMR) are significantly influenced by the variation of twist angle between two phenyl rings.Our results show with increase of the twist angle between two phenyl rings from 0 to 900the threshold voltage and firstdrop of TMR ratio increase, as well as the maximum value of TMR.

کلیدواژه ها:

Tunnel magnetoresistance ، Biphenyl molecule ، Green's function ، Molecular conformation