Spin-torque shot noise in magnetic tunnel junctions

Abstract

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.

5 pages, 2 figures

References in corpus (4)

• Spin Transfer Torques
• Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
• Functional Keldysh Theory of Spin Torques
• Many-body theory of non-equilibrium systems

Cited by in corpus (1)

• Stochastic dynamics of magnetization in a ferromagnetic nanoparticle out of equilibrium