Giant magnetoresistance and spin Seebeck coefficient in zigzag   a-graphyne nanoribbons
  We investigate the spin-dependent electric and thermoelectric properties of ferromagnetic zigzag-graphyne nanoribbons (ZGNRs) using the density-functional theory combined with the non-equilibrium Green's function method. A giant magnetoresistance is obtained in the pristine even-width ZGNRs and can be as high as 10e6 %. However, for the doped systems, a large magnetoresistance behavior may appear in the odd-width ZGNRs rather than the even-width ones. This suggests that the magnetoresistance can be manipulated in a wide range by the dopants on edges of ZGNRs. Another interesting phenomenon is that in the B- and N-doped even-width ZGNRs the spin Seebeck coefficient is always larger than the charge Seebeck coefficient, and a pure-spin-current thermospin device can be achieved at specific temperatures. 
M. X. Zhai, X. F. Wang, P. Vasilopoulos, Y. S. Liu, Y. J. Dong, L.   Zhou, Y. J. Jiang and W. L. You
cond-mat.mtrl-sci cond-mat.mes-hall