Current driven switching of magnetic layers

Details Current driven switching of magnetic layers Current driven switching of magnetic layers

2000-05-03

arxiv.org/abs/cond-mat/0005064v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 2 figure. Submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.63.064424

The switching of magnetic layers is studied under the action of a spin current in a ferromagnetic metal/non-magnetic metal/ferromagnetic metal spin valve. We find that the main contribution to the switching comes from the non-equilibrium exchange interaction between the ferromagnetic layers. This interaction defines the magnetic configuration of the layers with minimum energy and establishes the threshold for a critical switching current. Depending on the direction of the critical current, the interaction changes sign and a given magnetic configuration becomes unstable. To model the time dependence of the switching process, we derive a set of coupled Landau-Lifshitz equations for the ferromagnetic layers. Higher order terms in the non-equilibrium exchange coupling allow the system to evolve to its steady-state configuration.

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