Europhys. Lett.
Volume 68, Number 2, October 2004
Page(s) 268 - 274
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 October 2004
Europhys. Lett., 68 (2), pp. 268-274 (2004)
DOI: 10.1209/epl/i2004-10191-8

Absence of weak electron localization in ferromagnetic cobalt wires

M. Brands, A. Carl and G. Dumpich

Institut für Physik, Experimentalphysik, Universität Duisburg-Essen 47048 Duisburg, Germany

received 21 April 2004; accepted in final form 19 August 2004

We have investigated the low-temperature resistance behavior and the magnetoresistance of single-domain cobalt wires of 400 $\un{\mu m}$ length, 2 $\un{\mu m}$ width and thicknesses between 5 $\un{nm}$ and 32 $\un{nm}$. A logarithmic resistance increase is observed for temperatures T<15 $\un{K}$ which is consistently explained as originating from enhanced electron-electron interactions (EEI) in two dimensions rather than from weak electron localization (WEL). The results are confirmed for both platinum-capped and un-capped cobalt wires of various thicknesses. Our experimental results are compared with recent theoretical predictions for 2-dimensional ferromagnetic systems.

73.61.-r - Electrical properties of specific thin films.
75.60.Ej - Magnetization curves, hysteresis, Barkhausen and related effects.
75.60.Ch - Domain walls and domain structure.

© EDP Sciences 2004