title: Domain-wall depinning assisted by pure spin currents.
abstract: We study the depinning of domain walls by pure diffusive spin currents in a nonlocal spin valve structure based on two ferromagnetic Permalloy elements with copper as the nonmagnetic spin conduit. The injected spin current is absorbed by the second Permalloy structure with a domain wall, and from the dependence of the wall depinning field on the spin current density we find an efficiency of 6×10{-14}  T/(A/m{2}), which is more than an order of magnitude larger than for conventional current induced domain-wall motion. Theoretically we find that this high efficiency arises from the surface torques exerted by the absorbed spin current that lead to efficient depinning.
authors.affiliation: Fachbereich Physik, Universität Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Ilgaz
authors.forename: J
authors.initials: J
authors.lastname: Nievendick
authors.forename: L
authors.initials: L
authors.lastname: Heyne
authors.forename: D
authors.initials: D
authors.lastname: Backes
authors.forename: J
authors.initials: J
authors.lastname: Rhensius
authors.forename: T A
authors.initials: TA
authors.lastname: Moore
authors.forename: M A
authors.initials: MA
authors.lastname: Niño
authors.forename: A
authors.initials: A
authors.lastname: Locatelli
authors.forename: T O
authors.initials: TO
authors.lastname: Menteş
authors.forename: A V
authors.initials: AV
authors.lastname: Schmidsfeld
authors.forename: A V
authors.initials: AV
authors.lastname: Bieren
authors.forename: S
authors.initials: S
authors.lastname: Krzyk
authors.forename: L J
authors.initials: LJ
authors.lastname: Heyderman
authors.forename: M
authors.initials: M
authors.lastname: Kläui