Tunnel Magnetoresistance of the Heterocyclic Molecular Junctions: A Green’s Function Approach
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- 作者：A. Ahmadi?Fouladi (1) a.ahmadifouladi@iausari.ac.ir
S. A. Ketabi (2) saketabi@du.ac.ir
S. M. Elahi (1)
S. A. Sebt (1) - 关键词：Spin ; dependent transport – Green’s function – Heterocyclic molecules – TMR
- 刊名：Journal of Superconductivity Incorporating Novel Magnetism
- 出版年：2012
- 出版时间：August 2012
- 年：2012
- 卷：25
- 期：6
- 页码：1965-1970
- 全文大小：445.7 KB
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- ISSN：1557-1947
文摘
We explore the spin-dependent transport properties in a molecular junction model made of heterocyclic molecules such as poythiophene, polyfuran, and polypyrrole sandwiched between ferromagnetic three-dimensional electrodes, hereafter named FM/h-molecule/FM junction, based on a tight-binding model and a generalized Green’s function method in the Landauer–Büttiker formalism. The coherent spin-dependent transport through the energy levels of heterocyclic molecules, the transmittance, current–voltage (I–V) characteristics, and the tunnel magnetoresistance (TMR) of the FM/h-molecule/FM junction are numerically investigated. It is found that the spin-dependent transport properties are importantly influenced by the heteroatoms in the heterocyclic molecules. It is shown that the TMR of the molecular junction can be quite large (over 69 %) depending on the applied voltage and the molecular field of the FM electrodes.