High Domain Wall Velocities due to Spin Currents Perpendicular to the Plane.
We consider long and narrow spin valves composed of a first magnetic layer with a single domain wall (DW), a normal metal spacer, and a second magnetic layer that is a planar or a perpendicular polarizer. For these structures, we study numerically DW dynamics taking into account the spin torques due to the perpendicular spin currents. We obtain high DW velocities: 5 m/s for planar polarizer and 80 m/s for perpendicular polarizer for I=0.01 mA. These values are much larger than those predicted and observed for DW motion due to the in-plane spin currents. The ratio of the magnitudes of the torques, which generate the DW motion in the respective cases, is responsible for these large differences.
Khvalkovskiy
A V
AV
A. M. Prokhorov General Physics Institute of RAS, 119991 Moscow, Russia. khvalkov@fpl.gpi.ru
Zvezdin
K A
KA
Gorbunov
Ya V
YV
Cros
V
V
Grollier
J
J
Fert
A
A
Zvezdin
A K
AK