论文标题
THZ自旋发射器中界面传播与自旋泵送实验中的自旋混合电导的相关性
Correlation of interface transmission in THz spintronic emitters with spin mixing conductance in spin pumping experiments
论文作者
论文摘要
THZ Spintronics的领域是Spintronics研究领域的新方向，将磁性与光学物理学和超快光子学结合在一起。该领域的实验方案涉及使用飞秒激光脉冲来触发由铁磁性（FM）和非磁性（NM）薄膜组成的双层中的超快自旋和电荷动力学，其中NM层具有较强的自旋孔偶联。 THZ Spintronic发射器的关键技术和科学挑战是增加其强度和频率带宽。为了实现这一点，需要对辐射源的控制，即需要超快自旋电流的运输。但是，旋转电流从FM转移到NM层是一种高度界面敏感的效果。在这项工作中，我们研究了通过界面测量THZ发射强度的自旋电流传输的性能，并将其与有效的自旋混合电导率进行了比较，这是旋转电流通过接口的关键概念之一。结果表明，与THZ发射的改善相似，具有较高外观的界面的自旋混合电导的增强。自旋混合电导和THZ发射之间的比例可以定义工程旋转发射器发射的新方向。
The field of THz spintronics is a novel direction in the research field of spintronics that combines magnetism with optical physics and ultrafast photonics. The experimental scheme of the field involves the use of femtosecond laser pulses to trigger ultrafast spin and charge dynamics in bilayers composed of ferromagnetic (FM) and non-magnetic (NM) thin films where the NM layer features a strong spin-orbit coupling. The key technological and scientific challenges of THz spintronic emitters is to increase their intensity and frequency bandwidth. To achieve this the control of the source of the radiation, namely the transport of the ultrafast spin current is required. However, the transfer of a spin current from a FM to a NM layer is a highly interface-sensitive effect. In this work we study the properties of the spin current transport through the interface measuring the strength of the THz emission and compare it to the effective spin mixing conductance, one of the key concepts in the spin current transport through interfaces. The results show an enhancement of the spin mixing conductance for interfaces with higher degree of epitaxy similarly to the improvement of the THz emission. The proportionality between spin mixing conductance and THz emission can define new directions in engineering the emission of spintronic THz emitters.
