Magnetization oscillation in a nanomagnet driven by a self-controlled spin-polarized current: Nonlinear stability analysis

Xiao Chen, Zhizhuai Zhu, Yun Jing, Shuai Dong, Jun Ming Liu

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The magnetization dynamics of a nanomagnet is investigated by performing macromagnetic simulation and nonlinear stability analysis on the spin precession trajectory. We propose a scheme in which a self-controlled spin-polarized current plus a magnetic field is employed to excite the self-oscillation of the magnetization through spin precession. It is revealed that the negative feedback mechanism of the spin torque is responsible for the self-oscillation excitation. The periodic solutions and the limit cycle stability for two specific configurations in terms of the directions of the spin-polarized current and magnetic field are analyzed, implying that the self-oscillation of magnetization essentially depends on the demagnetization field.

Original languageEnglish (US)
Article number054414
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number5
DOIs
StatePublished - Aug 7 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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