Spin accumulation and domain wall magnetoresistance in 35 nm Co wires

Citation
U. Ebels et al., Spin accumulation and domain wall magnetoresistance in 35 nm Co wires, PHYS REV L, 84(5), 2000, pp. 983-986
Citations number
25
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
84
Issue
5
Year of publication
2000
Pages
983 - 986
Database
ISI
SICI code
0031-9007(20000131)84:5<983:SAADWM>2.0.ZU;2-#
Abstract
An enhancement of the resistance due to the presence of only one or two iso lated domain walls is clearly evidenced by transport measurements in 35 nm epitaxial Co wires, 20 mu m long. The deduced relative change in the resist ivity is at least 1 order of magnitude larger than the one predicted from a model based on the mixing of spin channels occurring over the length scale of the domain wall width [P.M. Levy and S. Zhang, Phys. Rev. Lett. 79, 511 0 (1997)]. This inconsistency can be resolved by taking the effect of spin accumulation into account, which scales in the case of Co over the much lar ger distance of the spin diffusion length.