Giant magnetoresistance and spin Seebeck coefficient in zigzag a-graphyne nanoribbons
Abstract
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.
Keywords
Cite
@article{arxiv.1408.6909,
title = {Giant magnetoresistance and spin Seebeck coefficient in zigzag a-graphyne nanoribbons},
author = {M. X. Zhai and X. F. Wang and P. Vasilopoulos and Y. S. Liu and Y. J. Dong and L. Zhou and Y. J. Jiang and W. L. You},
journal= {arXiv preprint arXiv:1408.6909},
year = {2014}
}