Biased quasiballistic spin torque magnetization reversal.
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.
Serrano-Guisan
S
S
Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany. santiago.serrano-guisan@ptb.de
Rott
K
K
Reiss
G
G
Langer
J
J
Ocker
B
B
Schumacher
H W
HW