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Spin polarization and giant magnetoresistance effect induced by magnetization in zigzag graphene nanoribbons
- Source :
- Physical Review B. 81
- Publication Year :
- 2010
- Publisher :
- American Physical Society (APS), 2010.
-
Abstract
- We investigate spin-dependent electron transport through a zigzag graphene nanoribbon sample with two ferromagnetic strips deposit on two sides of the graphene ribbon. Our results show that, for the antiparallel configurations of ferromagnetic strips, the conductance exhibits zero conductance plateau when the Fermi energy locates around the Dirac point and the sample shows the properties of a semiconductor. But for the parallel configurations, the energy band spectrum is metallic and the conductance is always equal to or larger than ${e}^{2}/h$. Thus the huge giant magnetoresistance effect can be achieved by altering the configurations of the ferromagnetic strips. Moreover, we study the spin-dependent conductance for the parallel configuration. It is found that the device shows half-metal behavior, in which it acts as a conductor to carriers of one spin orientation but as an insulator to those of the opposite spin orientation. So the present device can be applied as a spin filter. In addition, we study the consequence of the short-range Anderson disorder and find that the spin filtering effect and magnetoresistance effect still remain even in the strong disorder limit.
- Subjects :
- Materials science
Condensed matter physics
Spin polarization
Spintronics
Magnetoresistance
Graphene
Giant magnetoresistance
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
law.invention
Condensed Matter::Materials Science
Zigzag
law
Spin Hall effect
Condensed Matter::Strongly Correlated Electrons
Graphene nanoribbons
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 81
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........a049391a5930a9d12d02d132cdf19688