Phenomenological Theory of Current-Induced Magnetization Precession

Published

February 13, 2004

Author(s)

Mark D. Stiles, J Xiao, A Zangwill

Abstract

We solve appropriate drift-diffusion and Landau-Lifshitz-Gilbert equations to demonstrate that unpolarized current flow from a non-magnet into a ferromagnet can produce a precession-type instability of the magnetization. The fundamental origin of the instability is the difference in conductivity between majority spins and minority spins in the ferromagnet. This leads to spin accumulation and spin currents that carry angular momentum across the interface. The component of this angular momentum perpendicular to the magnetization drives precessional motion that is opposed by Gilbert damping. Neglecting magnetic anisotropy and magnetostatics, our approximate analytic and exact numerical solutions using realistic values for the material parameters show (for both semi-infinite and thin film geometries) that a linear instability occurs when both the current density and the excitation wave vector parallel to the interface are neither too small nor too large. For many aspects of the problem, the variation of the magnetization in the direction of the current flows makes an important contribution.

Citation

Physical Review B (Condensed Matter and Materials Physics)

Volume

69

Issue

5

Pub Type

Journals

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Keywords

current-induced torque, magnetic instability, magnetic multilayers, precession, spin current, spin current, spin waves, spin-transfer torque

Citation

Stiles, M. , Xiao, J. and Zangwill, A. (2004), Phenomenological Theory of Current-Induced Magnetization Precession, Physical Review B (Condensed Matter and Materials Physics), [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=620556 (Accessed September 15, 2024)