Browsing by Subject "Metallic electrodes"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Open Access Size-dependent alternation of magnetoresistive properties in atomic chains(American Institute of Physics, 2006) Durgun, Engin; Senger, R. T.; Mehrez, H.; Sevinçli, H.; Çıracı, SalimSpin-polarized electronic and transport properties of carbon atomic chains are investigated when they are capped with magnetic transition-metal (TM) atoms like Cr or Co. The magnetic ground state of the TM-C n-TM chains alternates between the ferromagnetic (F) and antiferromagnetic (AF) spin configurations as a function of n. In view of the nanoscale spintronic device applications the desirable AF state is obtained for only even-n chains with Cr; conversely only odd-n chains with Co have AF ground states. When connected to appropriate metallic electrodes these atomic chains display a strong spin-valve effect. Analysis of structural, electronic, and magnetic properties of these atomic chains, as well as the indirect exchange coupling of the TM atoms through non-magnetic carbon atoms are presented.Item Open Access Spintronic properties of zigzag-edged triangular graphene flakes(AIP Publishing LLC, 2010) Şahin, H.; Senger, R. T.; Çıracı, SalimWe investigate quantum transport properties of triangular graphene flakes with zigzag edges by using first principles calculations. Triangular graphene flakes have large magnetic moments which vary with the number of hydrogen atoms terminating its edge atoms and scale with its size. Electronic transmission and current-voltage characteristics of these flakes, when contacted with metallic electrodes, reveal spin valve and remarkable rectification features. The transition from ferromagnetic to antiferromagnetic state under bias voltage can, however, terminate the spin polarizing effects for specific flakes. Geometry and size dependent transport properties of graphene flakes may be crucial for spintronic nanodevice applications.