Absence of weak electron localization in ferromagnetic cobalt wiresM. 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 length, 2 width and thicknesses between 5 and 32 . A logarithmic resistance increase is observed for temperatures T<15 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