Spin-torque shot noise in magnetic tunnel junctions

Details Spin-torque shot noise in magnetic tunnel junctions Spin-torque shot noise in magnetic tunnel junctions

2008-03-14

arxiv.org/abs/0803.2101v1

Phys. Rev. Lett. 101, 066601 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.101.066601

Spin polarized current may transfer angular momentum to a ferromagnet, resulting in a spin-torque phenomenon. At the same time the shot noise, associated with the current, leads to a non-equilibrium stochastic force acting on the ferromagnet. We derive stochastic version of Landau-Lifshitz-Gilbert equation for a magnetization of a ''free'' ferromagnetic layer in contact with a ''fixed'' ferromagnet. We solve the corresponding Fokker-Planck equation and show that the non-equilibrium noise yields to a non-monotonous dependence of the precession spectrum linewidth on the current.

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