title: Biased quasiballistic spin torque magnetization reversal.
abstract: We explore the ultrafast limit of spin torque magnetization reversal time. Spin torque precession during a spin torque current pulse and free magnetization ringing after the pulse is detected by time-resolved magnetotransport. Adapting the duration of the pulse to the precession period allows coherent control of the final orientation of the magnetization. In the presence of a hard axis bias field, we find optimum quasiballistic spin torque magnetization reversal by a single precessional turn directly from the initial to the reversed equilibrium state.
authors.affiliation: Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany. santiago.serrano-guisan@ptb.de
authors.forename: S
authors.initials: S
authors.lastname: Serrano-Guisan
authors.forename: K
authors.initials: K
authors.lastname: Rott
authors.forename: G
authors.initials: G
authors.lastname: Reiss
authors.forename: J
authors.initials: J
authors.lastname: Langer
authors.forename: B
authors.initials: B
authors.lastname: Ocker
authors.forename: H W
authors.initials: HW
authors.lastname: Schumacher