Current-driven excitations in magnetic multilayers: a brief review

Details Current-driven excitations in magnetic multilayers: a brief review Current-driven excitations in magnetic multilayers: a brief review

2003-10-20

arxiv.org/abs/cond-mat/0310467v1

Physics

Condensed Matter

Materials Science

5 pages, 7 figures, expected to appear in conf. proceedings

Scientific paper

10.1002/pssa.200304421

In 1996, Berger and Slonczewski independently predicted that a large enough spin-polarized dc current density sent perpendicularly through a ferromagnetic layer could produce magnetic excitations (spin-waves) or reversal of magnetization (switching). In the past few years, both current-driven switching and current-driven excitation of spin-waves have been observed. The switching is of potential technological interest for direct 'writing' of magnetic random access memory (MRAM) or magnetic media. The spin-wave generation could provide a new source of dc generated microwave radiation. We describe what has been learned experimentally about these two related phenomena, and some models being tested to explain these observations.

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