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式，我们将加速这些非共线反铁磁体的种子自旋轨道转矩磁化反转到超快的时间尺度。为了实现这一目标，我们将采用片上自旋电子发射器注入太赫兹频率的电流脉冲。由此产生的手征自旋织构的切换将通过时间分辨的测量贝里曲率驱动的反常霍尔效应使用光电导采样检测。这些新的设备的几何形状的发展将使用亚铁磁材料GdFe和DyCo 5进行测试。

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.