Spin-transfer-torque-induced ferromagnetic resonance for Fe/Cr/Fe layers with an antiferromagnetic coupling field
Spin-transfer-torque-induced ferromagnetic resonance for Fe/Cr/Fe layers with an antiferromagnetic coupling field
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DOI：
10.1063/1.3143625
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发表时间：
2009-05
影响因子：
4
通讯作者：
T. Seki;H. Tomita;A. Tulapurkar;M. Shiraishi;T. Shinjo;Yoshishige Suzuki
中科院分区：
文献类型：
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作者：
T. Seki;H. Tomita;A. Tulapurkar;M. Shiraishi;T. Shinjo;Yoshishige Suzuki
为了了解自旋转移扭矩(STT)对人工磁结构的影响，研究了具有反铁磁耦合场的Fe/Cr/Fe层的自旋转移扭矩(STT)诱导和磁场诱导的铁磁共振(FMR)。由于反铁磁耦合作用，磁场感生的铁磁共振在零磁场下表现出较高的共振频率。STT诱导出具有反铁磁耦合特征的FMR模。磁化不稳定性的临界电流密度为∼7×107A/cm~2，这表明在这种人工磁结构中，磁化不稳定的临界电流密度有可能产生磁化的动态相。
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.