Time-domain measurements of nanomagnet dynamics driven by spin-transfer torques.
We present time-resolved measurements of gigahertz-scale magnetic dynamics caused by torque from a spin-polarized current. By working in the time domain, we determined the motion of the magnetic moment throughout the process of spin-transfer-driven switching, and we measured turn-on times of steady-state precessional modes. Time-resolved studies of magnetic relaxation allow for the direct measurement of magnetic damping in a nanomagnet and prove that this damping can be controlled electrically using spin-polarized currents.
Krivorotov
I N
IN
Cornell University, Ithaca, NY 14853, USA. ink3@cornell.edu
Emley
N C
NC
Sankey
J C
JC
Kiselev
S I
SI
Ralph
D C
DC
Buhrman
R A
RA