title: Current driven domain wall velocities exceeding the spin angular momentum transfer rate in permalloy nanowires.
abstract: The velocity of domain walls driven by current in zero magnetic field is measured in permalloy nanowires using real-time resistance measurements. The domain wall velocity increases with increasing current density, reaching a maximum velocity of approximately 110 m/s when the current density in the nanowire reaches approximately 1.5 x 10(8) A/cm(2). Such high current driven domain wall velocities exceed the estimated rate at which spin angular momentum is transferred to the domain wall from the flow of spin polarized conduction electrons, suggesting that other driving mechanisms, such as linear momentum transfer, need to be taken into account.
authors.affiliation: IBM Almaden Research Center, San Jose, California, USA.
authors.forename: Masamitsu
authors.initials: M
authors.lastname: Hayashi
authors.forename: Luc
authors.initials: L
authors.lastname: Thomas
authors.forename: Charles
authors.initials: C
authors.lastname: Rettner
authors.forename: Rai
authors.initials: R
authors.lastname: Moriya
authors.forename: Yaroslaw B
authors.initials: YB
authors.lastname: Bazaliy
authors.forename: Stuart S P
authors.initials: SS
authors.lastname: Parkin