title: Width dependence of the nonadiabatic spin-transfer torque in narrow domain walls.
abstract: We analytically determine the spatially varying spin-transfer torque within a domain wall. In the case of ballistic spin and diffusive charge transport, the spin-transfer torque as well as the local degree of nonadiabaticity oscillate within a domain wall. In narrow domain walls, the degree of nonadiabaticity ceases to be a constant material parameter but depends on the domain-wall width including a possible sign change, which is crucial for experiments and the technological utilization in spin-transfer-torque-based storage devices.
authors.affiliation: Institut für Theoretische Physik, Universität Hamburg, Germany.
authors.forename: Stellan
authors.initials: S
authors.lastname: Bohlens
authors.forename: Daniela
authors.initials: D
authors.lastname: Pfannkuche