title: Size-dependent magnetic order and giant magnetoresistance in organic titanium-benzene multidecker cluster.
abstract: Using density functional theory and non-equilibrium Green's function method, we investigated the magnetic and transport properties of small organic titanium-benzene sandwich clusters TinBzn+1 (n = 1-3). The results show that TiBz2 is nonmagnetic while Ti2Bz3 and Ti3Bz4 are ferromagnetic, and our prediction is in agreement with experimental observation. The double exchange mechanism plays a key role in the ferromagnetism of larger clusters. With Ni as the two electrodes, significant spin-filter efficiency (SFE) and giant magnetoresistance (GMR) were found in the TinBzn+1 molecular junction. These transport properties could be controlled by cluster size, bias voltage or gate voltage. Specially, a sign-reversible GMR effect was observed in the Ti2Bz3 molecular junction. Finally, the microscopic mechanisms of SFE and GMR were suggested.
authors: Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China. yangzhi@tyut.edu.cn liuxuguang@tyut.edu.cn.
authors: Zhi
authors: Z
authors: Yang
authors: Baolong
authors: B
authors: Zhang
authors: Xuguang
authors: X
authors: Liu
authors: Xiuyan
authors: X
authors: Li
authors: Yongzhen
authors: Y
authors: Yang
authors: Shijie
authors: S
authors: Xiong
authors: Bingshe
authors: B
authors: Xu