Eur. Phys. J. E (2010) 31: 153-157
https://doi.org/10.1140/epje/i2010-10555-9

Regular Article

Giant magnetoresistance of coiling polymers

¹ Department of Physics, Pusan National University, 609-735, Busan, Korea
² BK21 Physics Research Division and Department of Energy Science, Sungkyunkwan University, 440-746, Suwon, Korea

^* e-mail: jyi@pusan.ac.kr

Received: 4 August 2009
Published online: 1 March 2010

Abstract

We examine the magnetoresistance (MR) of conducting polymers with interest paid on the role of structural flexibility. Through Monte Carlo simulation and Green function method, we evaluate the electric transmission for a variety of polymer configurations. It is found that for a single polymer the transmission displays a complex oscillation and also a parity-dependent periodicity. For an ensemble of polymers the averaged transmission yields the nonlinear behavior of MR under varying magnetic fields. Interestingly, more flexible polymers are shown to achieve higher MR, depending on the population and the size of the loops.