论文标题
旋转轨道扭矩对铁磁性COGD合金中铁磁和交换自旋波模式的影响
Effects of spin-orbit torque on the ferromagnetic and exchange spin wave modes in ferrimagnetic CoGd alloy
论文作者
论文摘要
我们使用微焦点brirouin光散射光谱来研究自旋轨道扭矩对几乎具有角度摩肌的热自旋波的影响。自旋轨道扭矩是由与COGD相邻的PT层中流动的电流产生的。在我们的测量结果中检测到铁磁和交换模式。铁磁模式的强度和线宽通过自旋轨道扭矩修饰。相反，交换模式的性能不受自旋轨道扭矩的影响。我们还发现，由于COGD在角动量补偿点附近COGD的温度依赖性很强，因此两种模式的频率和线宽都通过焦耳加热显着改变。我们的结果提供了有关可以基于铁磁性材料以及在抗铁磁体中实施的sub-THz磁性纳米振荡器的机制的洞察力。
We use micro-focus Brillouin light scattering spectroscopy to study the effects of spin-orbit torque on thermal spin waves in almost angular-momentum compensated ferrimagnetic CoGd alloy films. The spin-orbit torque is produced by the electric current flowing in the Pt layer adjacent to CoGd. Both the ferromagnetic and the exchange modes are detected in our measurements. The intensity and the linewidth of the ferromagnetic mode are modified by the spin-orbit torque. In contrast, the properties of the exchange mode are unaffected by the spin-orbit torque. We also find that the frequencies and the linewidths of both modes are significantly modified by Joule heating, due to the strong temperature dependence of the magnetic properties of CoGd in the vicinity of angular momentum compensation point. Our results provide insight into the mechanisms that can enable the implementation of sub-THz magnetic nano-oscillators based on ferrimagnetic materials, as well as related effects in antiferromagnets.
