Abstract:

Spintronics has attracted much scientific and technological interest in recent years. The hybrid devices which integrate spin-dependent effect into semiconductors or organic materials are proposed. Organic materials such as small molecules and polymers are believed to have long spin coherence due to the weak spin-orbit interaction and hyperfine interaction. Recently we have studied the spin transport through molecules using self-assembled monolayers(SAMs) of molecules on half metallic Fe3O4 nanoparticles. The magnetoresistance (MR) of molecule fully covered nanoparticles is up to 7.3% at room temperature, which is more than two times larger than that of pure Fe3O4 nanoparticles. By varying the length of the molecules from about 0.8 nm to 2 nm, the resistance increases exponentially. However the MR almost keeps constant, indicating the spin scattering is weak in molecules and spin diffusion length is estimated to be much larger than 4 nm at room temperature. These results show that small molecules are promising for development of future spin-based molecular electronics. Finally, the spin transport mechanism in molecules will be discussed in this talk.
 
 
  Return