title: Nanometer scale observation of high efficiency thermally assisted current-driven domain wall depinning.
abstract: Nanometer scale observation of the depinning of a narrow domain wall (DW) under a spin current is reported. We studied approximately 12 nm wide 1D Bloch DWs created in thin films exhibiting perpendicular magnetic anisotropy. Magnetotransport measurements reveal thermally assisted current-driven DW motion between pinning sites separated by as little as 20 nm. The efficiency of current-driven DW motion assisted by thermal fluctuations is measured to be orders of magnitude higher than has been found for in-plane magnetized films, allowing us to control DW motion on a nanometer scale at low current densities.
authors.affiliation: Hitachi Global Storage Technologies, San Jose Research Center, 650 Harry Road, San Jose, California 95120 USA.
authors.forename: D
authors.initials: D
authors.lastname: Ravelosona
authors.forename: D
authors.initials: D
authors.lastname: Lacour
authors.forename: J A
authors.initials: JA
authors.lastname: Katine
authors.forename: B D
authors.initials: BD
authors.lastname: Terris
authors.forename: C
authors.initials: C
authors.lastname: Chappert