The spin-filter capability and giant magnetoresistance effect in vanadium–naphthalene sandwich cluster

• Published in: Organic electronics Vol. 14; no. 11; pp. 2916 - 2924
• Main Authors: Yang, Zhi, Zhang, Baolong, Liu, Xuguang, Yang, Yongzhen, Li, Xiuyan, Xiong, Shijie, Xu, Bingshe
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.11.2013; Elsevier
• Subjects: Applied sciences; Compound structure devices; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electronic transport in condensed matter; Electronics; Exact sciences and technology; Exchange and superexchange interactions; Giant magnetoresistance; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetotransport phenomena, materials for magnetotransport; Negative differential resistance; Physics; Sandwich cluster; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Spin polarized transport; Spin-filter capability; Sandwich cluster; Giant magnetoresistance; Negative differential resistance; Spin-filter capability; Double exchange; Transport properties; Ground states; Vanadium; Ferromagnetic materials; Magnetoresistive devices; Non equilibrium conditions; Ferromagnetism; Spin filter; Organic electronics; Magnetic properties; Negative differential conductivity; Forecasting; Sandwich structures; Naphthalene; Density functional method; Nickel; Transport processes; Green's function methods; Exchange interactions; Spintronics
• DOI: 10.1016/j.orgel.2013.08.016
• ISSN: 1566-1199

The giant magnetoresistance effects of different-sized vanadium–naphthalene sandwich clusters. [Display omitted] •Different-sized vanadium–naphthalene sandwich clusters are all very stable and could exhibit rich magnetic properties.•The spin-filter capability and negative differential resistance can be observed in these systems.•The giant magnetoresistance effect was also found in the sandwiches and the transport properties can be adjusted according to cluster size. Using density functional theory and non-equilibrium Green’s function technique, we performed theoretical investigations on the magnetic and transport properties of V2n(C10H8)n+1 (n=1–4) sandwich clusters. For the ground states, our results show that all the clusters are stable and possess ferromagnetic orders. The smaller clusters have higher stabilities, and our predictions are in agreement with the experimental observation. The double exchange mechanism plays an important role in determining the magnetic properties of the systems. Furthermore, with Ni as electrodes, the clusters exhibit interesting transport properties such as significant spin-filter capability, negative differential resistance feature and giant magnetoresistance effect. These findings suggest that V2n(C10H8)n+1 sandwiches are excellent candidates for application in spintronics and organic electronics.