TITLE

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

AUTHOR(S)
Seki, Takeshi; Tomita, Hiroyuki; Tulapurkar, Ashwin A.; Shiraishi, Masashi; Shinjo, Teruya; Suzuki, Yoshishige
PUB. DATE
May 2009
SOURCE
Applied Physics Letters;5/25/2009, Vol. 94 Issue 21, p212505
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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.
ACCESSION #
40637748

 

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