Spin-transfer-torque-induced ferromagnetic resonance for Fe/Cr/Fe layers with an antiferromagnetic coupling field

Takeshi Seki, Hiroyuki Tomita, Ashwin A. Tulapurkar, Masashi Shiraishi, Teruya Shinjo, Yoshishige Suzuki

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

In order to understand the effect of spin-transfer-torque (STT) on artificial magnetic structures, STT-induced and magnetic field-induced ferromagnetic resonances (FMRs) were investigated for Fe/Cr/Fe layers with an antiferromagnetic coupling field. The magnetic field-induced FMR showed high resonant frequency at zero magnetic field owing to the antiferromagnetic coupling field. FMR modes characteristic of antiferromagnetic coupling were induced by STT. From the STT-FMR spectra, the critical current density for magnetization instability was estimated to be ∼7× 107 A/ cm2, suggesting the possibility that STT gives rise to the dynamic phase of magnetization in such artificial magnetic structures.

Original languageEnglish
Article number212505
JournalApplied Physics Letters
Volume94
Issue number21
DOIs
Publication statusPublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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