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Phys Rev Lett. 2004 Jan 16;92(2):026602. Epub 2004 Jan 16.

Current-induced transverse spin-wave instability in a thin nanomagnet.

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1
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.

Abstract

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.

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