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Phys Rev Lett. 2012 Aug 31;109(9):096602. Epub 2012 Aug 29.

Current-induced switching of perpendicularly magnetized magnetic layers using spin torque from the spin Hall effect.

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1
Cornell University, Ithaca, New York 14853, USA.

Abstract

We show that in a perpendicularly magnetized Pt/Co bilayer the spin-Hall effect (SHE) in Pt can produce a spin torque strong enough to efficiently rotate and switch the Co magnetization. We calculate the phase diagram of switching driven by this torque, finding quantitative agreement with experiments. When optimized, the SHE torque can enable memory and logic devices with similar critical currents and improved reliability compared to conventional spin-torque switching. We suggest that the SHE torque also affects current-driven magnetic domain wall motion in Pt/ferromagnet bilayers.

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