The effect of dimerization on the magnetoresistance in organic spin valves

doi:10.1088/1674-1056/22/5/058504

Abstract The effect of lattice dimerization on the magnetoresistance (MR) in organic spin valves is investigated based on the Su-Schrieffer-Heeger (SSH) model and the Green's function method. By comparing with the results for a uniform chain, we find that the dimerization of the molecular chain modifies the monotonic dependence of the MR on the bias to an oscillatory one. A sign inversion of the MR is observed when the amplitude of the dimerization is adjusted. The results also show that at a low bias, the MR through a dimerized chain decreases with the increasing bias as well as the increasing chain length, which is consistent with the experimental reports. A further understanding can be achieved by analyzing the electronic states and the spin-dependent transmission spectrum with the parallel and antiparallel magnetization orientations of the two ferromagnetic electrodes.

Keywords: organic spintronics magnetoresistance dimerization

Received: 06 November 2012
Revised: 09 December 2012
Accepted manuscript online:

PACS:	85.75.-d	(Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)
	73.61.Ph	(Polymers; organic compounds)
	75.47.-m	(Magnetotransport phenomena; materials for magnetotransport)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10904084 and 10904083) and the Shandong Province Middle-Aged and Young Scientists Research Awards Foundation, China (Grant No. 2009BS01009).

Corresponding Authors: Hu Gui-Chao
E-mail: hgc@sdnu.edu.cn

Cite this article:

Wang Hui (王辉), Hu Gui-Chao (胡贵超), Ren Jun-Feng (任俊峰) The effect of dimerization on the magnetoresistance in organic spin valves 2013 Chin. Phys. B 22 058504

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The effect of dimerization on the magnetoresistance in organic spin valves

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