Spin-transfer-induced microwave oscillations in spin valves with ferromagnetic nano-contacts in oxide spacer layer

Masaaki Doi, Hiroaki Endo, Kazushige Shirafuji, Shohei Kawasaki, Masashi Sahashi, Hiromi Niu Fuke, Hitoshi Iwasaki, Hiroshi Imamura

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

We observed microwave oscillations induced by spin-transfer torque in spin valves with ferromagnetic nano-contacts in oxide spacer layer near the antiparallel magnetic moment configuration between the free and the reference layers. The frequency of the microwave oscillation ranges from 4.2 to 9.7 GHz and the Q-value of the level peak reaches as high as around 300. We showed that the frequency of the oscillation depends on the applied current and magnetic field, which can be qualitatively explained by considering the response of the domain walls confined in nano-contacts to the applied current and magnetic field.

Original languageEnglish
Article number092001
JournalJournal of Physics D: Applied Physics
Volume44
Issue number9
DOIs
Publication statusPublished - 2011 Mar 9

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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