Is magnetoresistance in excess of 1,000 % possible in Ni point contacts?
| dc.creator | Rocha, A. R. | |
| dc.creator | Archer, T. | |
| dc.creator | Sanvito, S. | |
| dc.date | 2007-01-22 | |
| dc.date.accessioned | 2026-07-07T07:42:03Z | |
| dc.date.available | 2026-07-07T07:42:03Z | |
| dc.description | Electronic transport in nickel magnetic point contacts is investigated with a combination of density functional theory and the non-equilibrium Green functions method. In particular we address the possibility of huge ballistic magnetoresistance in impurity-free point contacts and the effects of oxygen impurities. On-site corrections over the local spin density approximation (LSDA) for the exchange and correlation potential, namely the LDA+U method, are applied in order to account for low-coordination and strong correlations. We show that impurity-free point contacts present magnetoresistance never in excess of 50%. This value can raise up to about 450 % in the case of oxygen contamination. These results suggest that magnetoresistance in excess of 1,000 % can not have solely electronic origin. | |
| dc.description | 9 pages, 12 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0701512 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0701512 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/122347 | |
| dc.subject | Materials Science | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Is magnetoresistance in excess of 1,000 % possible in Ni point contacts? | |
| dc.type | text |