Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-03-09
Physica E 42, 703 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 7 figures. Contribution to EP2DS18, Kobe, 2009
Scientific paper
10.1016/j.physe.2009.11.046
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.
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