Spin-polarized currents generated by magnetic Fe atomic chains

Abstract

Fe-based devices are widely used in spintronics because of high spin-polarization and magnetism. In this work, free-standing Fe atomic chains were proposed to be used as the thinnest wires to generate spin-polarized currents due to the spin-polarized energy bands. By ab initio calculations, the zigzag structure was found more stable than the wide-angle zigzag structure and has higher ratio of spin-up and spin-down currents. By our theoretical prediction, Fe atomic chains have sufficiently long thermal lifetime only at T<=150 K, while C atomic chains are very stable even at T=1000 K. This result means that the spintronic devices based on Fe chains could only work at low temperature. A system constructed by a short Fe chain sandwiched between two graphene electrodes was proposed as a spin-polarized current generator, while a C chain does not have such property. The present work may be instructive and meaningful to further practical applications based on recent technical development on the preparation of metal atomic chains [Proc. Natl. Acad. Sci. U.S.A. 107, 9055 (2010)].

arXiv commentNanotechnology (2014)

References in corpus (19)

• The SIESTA method for ab initio order-N materials simulation
• Efficient index handling of multidimensional periodic boundary conditions
• Spintronics: Fundamentals and applications
• Density functional method for nonequilibrium electron transport
• Half-Metallic Graphene Nanoribbons
• Formation and manipulation of a metallic wire of single gold atoms
• Self-passivating edge reconstructions of graphene
• Evidence for Graphene Edges Beyond Zigzag and Armchair
• Ballistic conductance of magnetic Co and Ni nanowires with ultrasoft pseudo-potentials
• Electron Transport Properties of Atomic Carbon Nanowires between Graphene Electrodes
• A spin-filter device based on armchair graphene nanoribbons
• Inverse Magnetoresistance of Molecular Junctions
• Electronic transport in iron atomic contacts: from the infinite wire to realistic geometries
• Topological winding properties of spin edge states in Kane-Mele graphene model
• Highly tunable spin-dependent electron transport through carbon atomic chains connecting two zigzag graphene nanoribbons
• Efficient DFT+U calculations of ballistic electron transport: Application to Au monatomic chains with a CO impurity
• Spin-exchange-induced dimerization of an atomic 1-D system
• Effect of stretching on the ballistic conductance of Au nanocontacts in presence of CO: a density functional study
• Predicting the chemical stability of monatomic chains