Tunnel magnetoresistance due to Coulomb blockade effects in quasi-one dimensional polymer nanofibers

TL;DR

This paper investigates low-temperature tunnel magnetoresistance in quasi-1D polymer nanofibers, revealing Coulomb blockade effects that cause MR enhancement and oscillations due to single-electron tunneling.

Contribution

It demonstrates Coulomb blockade effects in polymer nanofibers, linking low-temperature MR behavior to charging effects and single-electron tunneling phenomena.

Findings

MR enhancement at low biases

Oscillatory MR behavior below 10 K

Coulomb blockade effects in polymer nanofibers

Abstract

We report on the low temperature tunnel magnetoresistance (MR) in quasi one-dimensional (1D) nanofibers made of conjugated polymers. The MR voltage bias dependence reveals an enhancement (at low biases) and the oscillatory behavior at temperatures below 10 K. The low temperature isotropic MR behavior has been attributed to the charging effects in the polymer nanofiber which considered as an array of small conducting regions separated by nano barriers. These effects at low temperatures lead to the single electron tunneling represented by the Coulomb blockade regime as well as to an enhancement and oscillation of the tunnel MR.