Current-Driven Magnetization Reversal and Spin-Wave Excitations in Co /Cu /Co Pillars

J. A. Katine, F. J. Albert, R. A. Buhrman, E. B. Myers, and D. C. Ralph
Phys. Rev. Lett. 84, 3149 – Published 3 April 2000
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Abstract

Using thin film pillars 100nm in diameter, containing two Co layers of different thicknesses separated by a Cu spacer, we examine the process by which the scattering from the ferromagnetic layers of spin-polarized currents flowing perpendicular to the layers causes controlled reversal of the moment direction in the thin Co layer. The well-defined geometry permits a quantitative analysis of this spin-transfer effect, allowing tests of competing theories for the mechanism and also new insight concerning magnetic damping. When large magnetic fields are applied, the spin-polarized current no longer fully reverses the magnetic moment, but instead stimulates spin-wave excitations.

  • Received 12 July 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.3149

©2000 American Physical Society

Authors & Affiliations

J. A. Katine, F. J. Albert, and R. A. Buhrman

  • School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853

E. B. Myers and D. C. Ralph

  • Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853

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Vol. 84, Iss. 14 — 3 April 2000

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