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

O. A. Tretiakov, Aditi Mitra

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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
Volume81
Issue number2
DOIs
Publication statusPublished - 2010 Jan 22

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Ac- and dc-driven noise and I-V characteristics of magnetic nanostructures'. Together they form a unique fingerprint.

  • Cite this