论文标题
抗铁磁性赤铁矿中的dzyaloshinskii-moriya相互作用操纵旋转电流动力学
Manipulating THz Spin Current Dynamics by the Dzyaloshinskii-Moriya Interaction in Antiferromagnetic Hematite
论文作者
论文摘要
现代磁性研究的一个重要愿景是将抗铁磁铁用作旋转设备中可控和主动的超快组件。在这方面，赤铁矿是一种有前途的模型材料，因为其明显的dzyaloshinskii-moriya相互作用会导致抗铁磁性和弱铁磁性的共存。在这里，我们使用飞秒激光脉冲将Terahertz旋转电流从赤铁矿驱动到相邻的PT层。我们发现对旋转电流的产生有两个贡献，具有明显不同的动力学：依赖于抗磁磁性的冲动刺激的拉曼擦伤和依赖于净磁化的超快自旋seebeck效应。因此，可以通过中强度磁场来操纵总THZ旋转电流动力学。在赤铁矿中实现的THZ自旋电流的可控性为控制超快抗磁性自旋源的精确自旋电流动力学开辟了道路。
An important vision of modern magnetic research is to use antiferromagnets as controllable and active ultrafast components in spintronic devices. Hematite is a promising model material in this respect because its pronounced Dzyaloshinskii-Moriya interaction leads to the coexistence of antiferromagnetism and weak ferromagnetism. Here, we use femtosecond laser pulses to drive terahertz spin currents from hematite into an adjacent Pt layer. We find two contributions to the generation of the spin current with distinctly different dynamics: the impulsive stimulated Raman scatting that relies on the antiferromagnetic order and the ultrafast spin Seebeck effect that relies on the net magnetization. The total THz spin current dynamics can thus be manipulated by a medium-strength magnetic field. The controllability of the THz spin current achieved in hematite opens the pathway toward controlling the exact spin current dynamics from ultrafast antiferromagnetic spin sources.
