TY - JOUR
T1 - Coupling site controlled spin transport through the graphene nanoribbon junction
T2 - A first principles investigation
AU - Zheng, Jiming
AU - Deng, Xiaoqing
AU - Zhao, Jianwei
AU - Guo, Ping
AU - Guo, Chongfeng
AU - Ren, Zhaoyu
AU - Bai, Jintao
PY - 2015/3
Y1 - 2015/3
N2 - A new type of nano-junctions based on Zigzag graphene nanoribbons (ZGNRs) has been proposed and investigated by first-principles calculations. The results show that large spin polarization of currents would be achieved when the junctions adopted the configuration that two ZGNR leads coupled each other along one edge. By virtue of spatial separation of the two spin edge states, only one spin channel is opened in those junctions at certain energy range, and spin polarized currents will be produced under a low bias. No more efforts are required to change ZGNR from the antiferromagnetic (AFM) ground states to the ferromagnetic (FM) states. Specially, this feature is stable, by changing the width of ZGNRs, modifying the edge morphology, and varying dihedral angle between two ZGNRs, spin polarization of currents are still observed. Our findings indicate that this approach is simple and efficient for spintronics design.
AB - A new type of nano-junctions based on Zigzag graphene nanoribbons (ZGNRs) has been proposed and investigated by first-principles calculations. The results show that large spin polarization of currents would be achieved when the junctions adopted the configuration that two ZGNR leads coupled each other along one edge. By virtue of spatial separation of the two spin edge states, only one spin channel is opened in those junctions at certain energy range, and spin polarized currents will be produced under a low bias. No more efforts are required to change ZGNR from the antiferromagnetic (AFM) ground states to the ferromagnetic (FM) states. Specially, this feature is stable, by changing the width of ZGNRs, modifying the edge morphology, and varying dihedral angle between two ZGNRs, spin polarization of currents are still observed. Our findings indicate that this approach is simple and efficient for spintronics design.
KW - Coupling site control
KW - First-principles calculation
KW - Graphene nanoribbons
KW - Spintronics
UR - http://www.scopus.com/inward/record.url?scp=84920992033&partnerID=8YFLogxK
U2 - 10.1016/j.commatsci.2014.12.031
DO - 10.1016/j.commatsci.2014.12.031
M3 - Article
AN - SCOPUS:84920992033
SN - 0927-0256
VL - 99
SP - 203
EP - 208
JO - Computational Materials Science
JF - Computational Materials Science
ER -