Ultrafast control of Berry-curvature-driven transport via spin-torque excitation of chiral magnets (B10*)

在这个项目中，我们将使用光学技术来研究Mn3Ir和Mn3Sn中的自旋动力学。通过激发预期的磁振子模，我们将加速这些非共线反铁磁体的种子自旋-轨道扭矩磁化反转到超快的时间尺度。为了实现这一目标，我们将使用芯片上的自旋电子发射器来注入太赫兹频率的电流脉冲。由此产生的手性自旋织构的转换将通过使用光导采样对Berry曲率驱动的反常霍尔效应进行时间分辨测量来检测。将使用亚铁磁性材料GdFe和DyCo5来测试这些新型器件几何结构的开发。

In this project, we will use optical techniques to study spin dynamics in Mn3Ir and Mn3Sn. By exciting the expected magnon modes, we will accelerate the seeded spin-orbit torque magnetization reversal of these noncollinear antiferromagnets to ultrafast timescales. To achieve this goal, we will employ on-chip spintronic emitters to inject THz-frequency current pulses. The resulting switching of chiral spin texture will be detected through time-resolved measurements of Berry-curvature-driven anomalous Hall effect using photo-conductive sampling. The development of these novel device geometries will be tested using the ferrimagnetic materials GdFe and DyCo5.