Spin-Wave Excitations in Nanopillars With Perpendicular Polarizers
Spin-Wave Excitations in Nanopillars With Perpendicular Polarizers
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DOI：
10.1109/tmag.2006.879737
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发表时间：
2006-09
影响因子：
2.1
通讯作者：
W. Jin;Yaowen Liu;Hong Chen
中科院分区：
文献类型：
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作者：
W. Jin;Yaowen Liu;Hong Chen
通过微磁模拟研究了具有垂直偏振器的自旋阀纳米柱中自旋转移引起的自旋波激发。在小电流下观察到两种共存的平面内磁化稳态。随着电流的增加，仅通过电流就可以调谐频率从几吉赫兹到几十吉赫兹的周期性振荡自旋波。在这些周期性振荡中仅观察到基频奇数次的高次谐波。基频随着自由层厚度的增加而降低。大电流可以激发混沌自旋波
Spin-transfer-induced spin-wave excitations in spin-valve nanopillars with perpendicular polarizers have been investigated by micromagnetic simulations. Two coexistent steady states with in-plane magnetizations are observed at small current. With the increased current, periodic oscillating spin waves with frequency from several to tens of gigahertz can be tuned by current alone. High-order harmonics with odd times of fundamental frequency only are observed in these periodic oscillations. The fundamental frequency decreases with the increased thickness of the free layer. Large current could excite chaotic spin waves