单分子磁体与分子自旋电子材料

Single-Molecule Magnets and Materials of Molecular Spintronics

从单分子磁体合成、结构和性质及其在分子自旋晶体管、分子自旋电子管中的应用等方面,结合最新研究成果对这一有着应用前景的领域作了简要概述.单分子磁体是由内部的磁核和外围的有机分子壳层组成,可以通过修饰有机配体的基团和交换内部磁性离子等方法改善其物理和化学性能:带有烷基间隔基的[Co(Tpy-(CH2)5-SH)2]单核磁分子是一个弱偶合体系,而无烷基间隔基的[Co(TerPy)2]是强偶合,且Kondo温度异常地高(约25 K);将含两个磁中心的二核钒分子([(N,N′,N″-trimethyl-1,4,7-triazacyclononane)2 V2(CN)4(μ-C4N4)])嫁接到电极表面出现有趣物理效应.上述就是在分子水平上研究电子自旋和电荷的分子自旋电子装置.

The recent achievements in the preparation,structure,properties and applications of molecular spin-transistor and molecular spin-valve are briefly introduced.Single-molecule magnets（SMMs） consist of an inner magnetic core with a surrounding shell of organic ligands.The physical and chemical properties of SMMs could be improved by modi-fying the structure of organic ligands and exchange the magnetic ions.[Co（Tpy-（CH2）5-SH）2] mononuclear magnet molecule with alkyl spacers permits transportation in the weakly coupled regime,and [Co（TerPy）2] without spacers show strong coupling to the electrodes,with exceptional high kondo temperatures of around 25 K.Some interesting physical effects emerged when divanadium（[（N,N′,N″-trimethyl-1,4,7-triazacyclononane）2 V2（CN）4（μ-C4N4）]） was directly grafted to the electrodes.