Generation and Manipulation of Spin Current in Graphene Nanodisks: Robustness against Randomness and Lattice Defects
arXiv:1003.1766 · doi:10.1016/j.physe.2009.11.046
Abstract
Trigonal zigzag graphene nanodisk exhibits magnetism whose spin is proportional to the edge length of the nanodisk. Its spin can be designed from 1/2 to a huge value. The spins form a quasiferromagnet, which has intermediate properties between a single spin and a ferromagnet. In other words, the ferromagnet order has a relatively long life time, and yet the nanodisk spin can be rotated by external field or current. We consider a nanodisk connected with two leads. This system acts as a spin filter just as in a metal-ferromagnet-metal junction. In this way we can generate a spin current. Furthermore we can manipulate spin current by spin valve, spin switch and other spintronic devices made of graphene nanodisks. We also show that nanodisk spins are robust against the effect of randomness in site energy, transfer energy and lattice defects.
4 pages, 7 figures. Contribution to EP2DS18, Kobe, 2009
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- Electronic properties of gated triangular graphene quantum dots: Magnetism, correlations, and geometrical effects
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- Antiferromagnetism in hexagonal graphene structures: Rings vs dots
- Optical spin injection in graphene with Rashba spin-orbit interaction
- Ground-state magnetic phase diagram of bow-tie graphene nanoflakes in external magnetic field
- Ab initio materials physics and microscopic electrodynamics of media
- Boundary Ferromagnetism in Zigzag Edged Graphene
- Kondo effect in Lieb's ferrimagnetic system on the T-shaped bipartite lattice