High frequency operation of a spin-torque oscillator at low field
High frequency operation of a spin-torque oscillator at low field
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DOI：
10.1002/pssr.201105375
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发表时间：
2011-12-01
影响因子：
2.8
通讯作者：
Akerman, Johan
中科院分区：
文献类型：
--
作者：
Mohseni, S. M.;Sani, S. R.;Akerman, Johan
我们展示了一种基于纳米接触的自旋扭矩振荡器（STO），它将高工作频率与低场操作相结合。 STO 基于正交自旋阀架构，具有面内 Co 偏振器和面外 Co/Ni 多层自由层。通过调整 Co/Ni 层特性以增加垂直磁各向异性的强度 (H(k))，同时降低饱和磁化强度 (M(s))，可以实现低外场下的高频操作。我们的方法强调了 mu(0)(H(k)-M(s)) 在确定该系统工作频率方面的重要性，并建议通过进一步优化可以获得更高的频率。[图形](C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA，魏因海姆
We demonstrate a nano-contact based spin-torque oscillator (STO) combining a high operating frequency with low field operation. The STO is based on an orthogonal spin-valve architecture with an in-plane Co polarizer and an out-of-plane Co/Ni multilayer free layer. High frequency operation at low external fields is achieved by tailoring the Co/Ni layer properties to increase the strength (H(k)) of the perpendicular magnetic anisotropy, while simultaneously reducing the saturation magnetization (M(s)). Our approach emphasizes the importance of mu(0)(H(k)-M(s)) in determining the operating frequency in this system, and suggests that yet higher frequencies should be attainable through further optimization.[GRAPHICS](C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim