Spin filter,spin amplifier and spin diode in graphene nanodisk |
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Authors: | M Ezawa |
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Institution: | (1) Department of Applied Physics, University of Tokyo, Hongo 7-3-1, Hongo 113-8656, Japan |
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Abstract: | Graphene nanodisk is a graphene derivative with a closed edge. The trigonal
zigzag nanodisk with size N has N-fold degenerated zero-energy states.
It can be interpreted as a quantum dot with an internal degree of
freedom. The ground state of nanodisk
is a quasi-ferromagnet, which is a ferromagnetic-like state with a finite but
very long life time. We investigate spin-filter effects in the system
made of nanodisks and leads.
A novel feature of the nanodisk spin filter is that
its spin can be controlled by the spin current.
We propose some applications for spintronics, such as spin memory,
spin amplifier and spin diode.
It is argued that a spin current is reinforced (rectified) by feeding it into a nanodisk spin amplifier (diode).
Graphene nanodisk would be a promising candidate of future electronic and spintronic nanodevices. |
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Keywords: | PACS" target="_blank">PACS 85 75 -d Magnetoelectronics spintronics: devices exploiting spin polarized transport or integrated magnetic fields 81 05 Uw Carbon diamond graphite 73 63 Kv Quantum dots |
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