Heinen, J.Hinzke, D.Boulle, O.Malinowski, G.Swagten, H. J. M.Koopmans, B.Ulysse, C.Faini, G.Ocker, B.Wrona, J.Klaeui, M.2012-01-262012-01-262012-01-26201210.1088/0953-8984/24/2/024220https://infoscience.epfl.ch/handle/20.500.14299/77244WOS:000298543300021Novel nanofabrication methods and the discovery of an efficient manipulation of local magnetization based on spin polarized currents has generated a tremendous interest in the field of spintronics. The search for materials allowing for fast domain wall dynamics requires fundamental research into the effects involved (Oersted fields, adiabatic and non-adiabatic spin torque, Joule heating) and possibilities for a quantitative comparison. Theoretical descriptions reveal a material and geometry dependence of the non-adiabaticity factor beta, which governs the domain wall velocity. Here, we present two independent approaches for determining beta : (i) measuring the dependence of the dwell times for which a domain wall stays in a metastable pinning state on the injected current and (ii) the current-field equivalence approach. The comparison of the deduced beta values highlights the problems of using one-dimensional models to describe two-dimensional dynamics and allows us to ascertain the reliability, robustness and limits of the approaches used.Domain-Wall MotionFerromagnetsMemorytext::journal::journal article::research article