Graphene-based spintronic components

Abstract

A major challenge of spintronics is in generating, controlling and detecting spin-polarized current. Manipulation of spin-polarized current, in particular, is difficult. We demonstrate here, based on calculated transport properties of graphene nanoribbons, that nearly +-100% spin-polarized current can be generated in zigzag graphene nanoribbons (ZGNRs) and tuned by a source-drain voltage in the bipolar spin diode, in addition to magnetic configurations of the electrodes. This unusual transport property is attributed to the intrinsic transmission selection rule of the spin subbands near the Fermi level in ZGNRs. The simultaneous control of spin current by the bias voltage and the magnetic configurations of the electrodes provides an opportunity to implement a whole range of spintronics devices. We propose theoretical designs for a complete set of basic spintronic devices, including bipolar spin diode, transistor and logic gates, based on ZGNRs.

14 pages, 4 figures

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• Cr${}_3$X${}_4$ (X=Se, Te) monolayers as new platform to realize robust spin filter, spin diode and spin valve
• Interface sensitivity on spin transport through a three-terminal graphene nanoribbon
• Mechano-switching devices from carbon wire-carbon nanotube junctions
• A magnetic phase-transition graphene transistor with tunable spin polarization
• Stability of edge magnetism against disorder in zigzag MoS${}_2$ nanoribbons
• Optimal model of semi-infinite graphene for ab initio calculations of reactions at graphene edges by the example of zigzag edge reconstruction
• Tuning magnetism in graphene nanoribbons via strain and adatoms
• Nonlinear analog spintronics with van der Waals heterostructures
• Magnetoconductance of the Corbino disk in graphene: Chiral tunneling and quantum interference in the bilayer case
• Magnetic and electronic properties of 1D hybrid nanoobjects composed of alternating polycyclic hydrocarbon regions and double carbon chains
• Spin-dependent edge states in two-dimensional Dirac materials with a flat band