Nanowire spin torque oscillator driven by spin orbit torques
Nanowire spin torque oscillator driven by spin orbit torques
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DOI：
10.1038/ncomms6616
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发表时间：
2014-12-01
影响因子：
16.6
通讯作者：
Krivorotov, Ilya N.
中科院分区：
文献类型：
--
作者：
Duan, Zheng;Smith, Andrew;Krivorotov, Ilya N.
来自施加到铁磁体的纳米级区域的自旋电流的自旋扭矩可以充当负磁阻尼，从而激发其磁化的自振荡。相反，自旋扭矩均匀地施加到扩展的铁磁膜的磁化不产生自振荡磁动力学，但导致饱和磁化强度的降低。在这里，我们报告的自旋扭矩的影响的研究中的一个系统的中间维度-铁磁纳米线。我们观察到相干的自振荡的磁化在铁磁纳米线作为一个自旋轨道力矩驱动的自旋力矩振荡器的有源区。我们的工作表明，磁化自振荡可以激发在一个一维的磁系统和自旋力矩振荡器的活动区域的尺寸可以扩展到纳米长度尺度以外。
Spin torque from spin current applied to a nanoscale region of a ferromagnet can act as negative magnetic damping and thereby excite self-oscillations of its magnetization. In contrast, spin torque uniformly applied to the magnetization of an extended ferromagnetic film does not generate self-oscillatory magnetic dynamics but leads to reduction of the saturation magnetization. Here we report studies of the effect of spin torque on a system of intermediate dimensionality-a ferromagnetic nanowire. We observe coherent self-oscillations of magnetization in a ferromagnetic nanowire serving as the active region of a spin torque oscillator driven by spin orbit torques. Our work demonstrates that magnetization self-oscillations can be excited in a one-dimensional magnetic system and that dimensions of the active region of spin torque oscillators can be extended beyond the nanometre length scale.