High domain wall velocities due to spin currents perpendicular to the plane

Details High domain wall velocities due to spin currents perpendicular to the plane High domain wall velocities due to spin currents perpendicular to the plane

2008-06-14

arxiv.org/abs/0806.2369v1

Physics

Condensed Matter

Materials Science

10 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.102.067206

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: 50 m/s for planar polarizer and 640 m/s for perpendicular polarizer for J = 5*10^6 A/cm^2. 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.

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