Current-dependent linewidth of a spin-transfer nano-oscillator

R. Sato, Y. Saito, K. Mizushima

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Power spectra of a spin-transfer nano-oscillator, in which a reflection layer is included, are measured for current densities up to 1.2×107 A/cm2. A clear oscillation peak, which is slightly asymmetric with respect to the peak frequency, is observed at 5 GHz under the external field of 700 Oe. The large red shift of the peak frequency on increasing the current, which has been reported in nano-contact devices, is not observed. The relatively low oscillation frequencies as well as the absence of the large red shift indicate the reduction in the demagnetizing field in the free layer. The linewidth decreases with the current and is inversely proportional to the square of the precession amplitude of magnetization in accordance with the recent linear theories.

Original languageEnglish
Pages (from-to)990-995
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume321
Issue number8
DOIs
Publication statusPublished - 2009 Apr 1
Externally publishedYes

Keywords

  • Linewidth
  • Oscillator
  • Phase noise
  • Spin torque
  • Spin transfer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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