Different spin relaxation properties observed in linearly and circularly polarized laser induced terahertz emission from a Bi/Co bilayer
Different spin relaxation properties observed in linearly and circularly polarized laser induced terahertz emission from a Bi/Co bilayer
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在 Bi/Co 双层的线性和圆偏振激光诱导太赫兹发射中观察到不同的自旋弛豫特性
DOI：
10.1103/physrevb.107.144413
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发表时间：
2023
影响因子：
3.7
通讯作者：
Mizukami Shigemi
中科院分区：
文献类型：
--
作者：
Ishibashi Kazuaki;Iihama Satoshi;Mizukami Shigemi
最近，在Bi单层薄膜中报道了螺旋度相关的光电流。提出了这种光电流的起源是Bi中的光子-自旋转换和自旋-电荷转换效应的结合，并且期望Bi中的有效自旋转换。在这项研究中，我们测量了两种类型的太赫兹（THz）辐射的Bi/Co双层膜的自旋电流产生利用激光诱导退磁化的Co层和Bi层中的光子自旋转换效应，同时研究由这两种机制引起的自旋电流。我们在两个实验中清楚地观察到太赫兹自旋电流的峰值强度和带宽对Bi厚度的不同依赖性，即，自旋电流由Co的退磁和Bi中的光子-自旋转换引起。两个实验中自旋电流强度和带宽对Bi厚度的不同依赖性是由Bi层中光激发自旋电流的不同自旋弛豫性质引起的。
Recently, a helicity-dependent photocurrent was reported in Bi single-layer thin films. It is proposed that the origin of this photocurrent is the combination of photon-spin conversion and spin-charge conversion effects in Bi, and efficient spin conversion in Bi is expected. In this study, we measure two types of terahertz (THz) emissions from Bi/Co bilayer films induced by spin current generation using laser induced demagnetization of the Co layer and the photon-spin conversion effect in the Bi layer to investigate the spin current induced by the two mechanisms simultaneously. We clearly observe different Bi thickness dependences of peak intensity and bandwidth for THz spin current in two experiments, i.e., spin current induced by demagnetization of Co and by photon-spin conversion in Bi. The different Bi thickness dependences of spin current intensity and bandwidth in two experiments are caused by different spin relaxation properties of optically excited spin currents in Bi layers.
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