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

被引：12
作者：
Seki, Takeshi [1 ]
Tomita, Hiroyuki [1 ]
Tulapurkar, Ashwin A. [1 ]
Shiraishi, Masashi [1 ]
Shinjo, Teruya [1 ]
Suzuki, Yoshishige [1 ]
机构：
[1] Osaka Univ, Grad Sch Engn Sci, Toyonaka, Osaka 5608531, Japan
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 21期
关键词：
antiferromagnetic materials; chromium; critical currents; current density; ferromagnetic materials; ferromagnetic resonance; iron; magnetic structure; magnetic thin films; magnetisation; metallic thin films; PHASE-LOCKING; FE LAYERS; DRIVEN; EXCITATION; DEVICES; CR;
D O I：
10.1063/1.3143625
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 similar to 7x10(7) A/cm(2), suggesting the possibility that STT gives rise to the dynamic phase of magnetization in such artificial magnetic structures.
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