Ac- and dc-driven noise and I-V characteristics of magnetic nanostructures

O. A. Tretiakov, Aditi Mitra

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We study a structure consisting of a ferromagnetic (F) layer coupled to two normal metal (N) leads. The system is driven out of equilibrium by the simultaneous application of external dc and ac voltages across the N/F/N structure. Using the Keldysh diagrammatic approach, and modeling the ferromagnet as a classical spin of size S≫1, we derive the Langevin equation for the magnetization dynamics and calculate the noise correlator. We find that the noise has an explicit frequency dependence in addition to depending on the characteristics of the ac and dc drive. Further, we calculate the current-voltage characteristics of the structure to Ω(1/S2) and find that the nonequilibrium dynamics of the ferromagnetic layer gives rise to corrections to the current that are both linear and nonlinear in voltage.

Original languageEnglish
Article number024416
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number2
Publication statusPublished - 2010 Jan 22
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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