Influence of a Uniform Current on Collective Magnetization Dynamics in a Ferromagnetic Metal

Abstract

We discuss the influence of a uniform current, $\vec{j}$, on the magnetization dynamics of a ferromagnetic metal. We find that the magnon energy $\epsilon (\vec{q})$ has a current-induced contribution proportional to $\vec{q}\cdot \vec{\mathcal{J}}$, where $\vec{\mathcal{J}}$ is the spin-current, and predict that collective dynamics will be more strongly damped at finite $\vec{j}$. We obtain similar results for models with and without local moment participation in the magnetic order. For transition metal ferromagnets, we estimate that the uniform magnetic state will be destabilized for $j\gtrsim 10^9\mathrm{A}{\mathrm{cm}}^{-2}$. We discuss the relationship of this effect to the spin-torque effects that alter magnetization dynamics in inhomogeneous magnetic systems.

12 pages, 2 figures

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• Current-induced magnetization dynamics in disordered itinerant ferromagnets
• Theory of current-driven magnetization dynamics in inhomogeneous ferromagnets
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• Magnonic black holes
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• Effects of non-adiabaticity on the voltage generated by a moving domain wall
• Gauge Field Formulation of Adiabatic Spin Torques
• Current driven quantum criticality in itinerant electron ferromagnets
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• Hawking radiation and the boomerang behaviour of massive modes near a horizon
• The Cerenkov effect revisited: from swimming ducks to zero modes in gravitational analogs
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• Magnetic dynamics with Weyl fermions
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• Spin-torque effect on spin wave modes in magnetic nanowires
• Response of the chiral soliton lattice to spin polarized currents
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• Instability of magnetic skyrmion strings induced by longitudinal spin currents
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• Current-induced instability of domain walls in cylindrical nanowires
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