Current-induced transverse spin-wave instability in a thin nanomagnet.
We show that an unpolarized electric current incident perpendicular to the plane of a thin ferromagnet can excite a spin-wave instability transverse to the current direction if source and drain contacts are not symmetric. The instability, which is driven by the current-induced "spin-transfer torque," exists for one current direction only.
Polianski
M L
ML
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.
Brouwer
P W
PW