Frequency modulation of a nano-oxide layer-based spin-torque oscillator with FeCo nanocontacts

Muftah Al-Mahdawi, Masaaki Doi, Susumu Hashimoto, Hiromi N. Fuke, Hitoshi Iwasaki, Masashi Sahashi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We studied the effect of injecting a low-frequency (0.5-1 GHz) ac signal on the natural oscillations of a nano-oxide layer-based nanocontact magnetoresistive spin-torque oscillator with multiple Fe50Co 50 nanocontacts. We observed a frequency modulation effect with odd-numbered side bands having low amplitudes. Also, no frequency shift at main spectral peak's frequency, typical with nonlinear frequency modulation, was observed. We could not completely explain this behavior, but we propose that this could be related to the internal dynamics of constricted domain walls.

Original languageEnglish
Article number6027594
Pages (from-to)3380-3382
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number10
Publication statusPublished - 2011 Oct


  • Ferromagnetic nanocontact (NC)
  • frequency modulation
  • magnetoresistance (MR)
  • spin-torque oscillator
  • spin-transfer torque (STT)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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