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将光电子器件集成到硅片上是光电子集成器件研发的首要步骤. 自旋光电子学太赫兹辐射源, 通常是由纳米厚度的铁磁/非磁性金属多层膜结构组成, 在飞秒激光辐照下能产生高质量、宽带太赫兹脉冲辐射. 本文利用飞秒激光脉冲在生长于硅衬底上的Ta/CoFeB/Ir铁磁/非磁性金属异质结中实现了高效、宽带的太赫兹相干脉冲辐射. 首先, Ta/CoFeB/Ir异质结的太赫兹脉冲的极性随外加磁场的反转而反转, 太赫兹辐射的物理机制可以归结为超快自旋流-电荷流转换. 其次, 通过改变抽运激光的激发能量密度, 研究了Ta/CoFeB/Ir异质结的太赫兹辐射饱和现象. 此外, 通过研究Ta/CoFeB/Ir异质结的太赫兹发射特性随Ir层厚度的依赖关系, 不仅优化了器件的辐射强度, 而且获得了Ir层在太赫兹频率下的自旋扩散长度(~(0.59 ± 0.12) nm). 该值小于通过自旋抽运技术获得的GHz频率下的自旋扩散长度(1.34 nm), 表明不同频率范围对应于不同的电子输运机理.Terahertz spectroscopy and imaging have many applications, so the generation of broadband terahertz radiation is very important, but now it faces some challenges. Opto-spintronic terahertz emitters, composed of nanometer-thin magnetic multilayer, can produce high-quality broad-band terahertz pulses. Integration of opto-spintronic terahertz emitters onto the silicon wafers is the first step towards their usage in modern photonic devices. In this work, Ta/CoFeB/Ir heterostructures are deposited on thermally oxidized silicon wafers by dc magnetron sputtering. Under the illumination of a femtosecond laser pulse on the Ta/CoFeB/Ir trilayer heterostructure grown on silicon substrate, a spin current can be generated in the ferromagnetic layer due to the ultrafast demagnetization. The spin current is transported and injected into the neighboring non-magnetic metal layers of Ta and Ir. Consequently, the spin current can be converted into the charge current due to the strong spin-orbit coupling. The sub-picosecond transient charge current gives rise to the terahertz radiation that enters into the free space. The terahertz electric field is fully inverted when the magnetization is reversed, which indicates a strong connection between THz radiation and spin order of the heterostructure. The THz radiation from Ta/CoFeB/Ir heterostructure covers the 0.1–2.5 THz frequency range with a maximum value of about 0.64 THz. We also investigate the dependence of THz peak-to-peak value on the pump fluence. The THz emission is found to be saturated at a pump fluence of ~0.73 mJ/cm2. Our results demonstrate the existence of the strong spin-orbit coupling in the heavy metal Ir. Furthermore, we optimize the THz emission from the Ta/CoFeB/Ir heterostructure by changing the thickness of Ir layer. According to the thickness dependence of THz emission from the heterostructure, the propagation length of the spin current at THz frequencies is extracted to be about (0.59±0.12) nm, which is shorter than the GHz experimental measurement (~1.34 nm). Our experimental observation is consistent with that in the antiferromagnet IrMn layer, which may be attributed to different transport regimes. Theoretically, the optimized thickness values for CoFeB and Ir layers are 2.4 nm and 1.1 nm, respectively.
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Keywords:
- broadband terahertz radiation /
- ferromagnetic heterostructure /
- inverse spin hall effect /
- spin diffusion length
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图 1 (a)透射式太赫兹发射光谱实验系统示意图; (b)硅基Ta/CoFeB/Ir异质结的太赫兹辐射物理机理示意图, 飞秒激光脉冲激发铁磁层中的自旋流js注入相邻的非磁性金属Ta和Ir层中, 转换成垂直于磁化强度M的电荷流jc
Fig. 1. (a) Experimental setup for THz emission spectroscopy in the configuration of transmission; (b) in silicon-based Ta/CoFeB/Ir THz spintronic heterostructures, a femtosecond laser pulse excites CoFeB FM layer, the spin current js injects into the adjacent Ta and Ir layers, and then is transformed into transverse charge current jc, which is perpendicular to M.
图 2 (a) Ta(4 nm)/CoFeB(8 nm)/Ir(0.4 nm)和(b) Ta(4 nm)/CoFeB(8 nm)/Ir(0.8 nm)三层异质结典型的太赫兹辐射信号, 蓝色和红色曲线分别代表磁场方向为+H和–H时的太赫兹脉冲信号; 经傅里叶变换得到的归一化振幅谱(c) Ta(4 nm)/CoFeB(8 nm)/Ir(0.4 nm)和(d) Ta(4 nm)/CoFeB(8 nm)/Ir(0.8 nm)
Fig. 2. (a) THz emission pulses of Ta(4 nm)/CoFeB(8 nm)/Ir(0.4 nm) and (b) Ta(4 nm)/CoFeB(8 nm)/Ir(0.8 nm) three-layer heterostructures under ±H; the corresponding normalized amplitude spectra by Fourier transform for (c) Ta(4 nm)/CoFeB(8 nm)/Ir(0.4 nm), (d) Ta(4 nm)/CoFeB(8 nm)/Ir(0.8 nm).
图 3 (a) Ta(4 nm)/CoFeB(8 nm)/Ir(0.8 nm)异质结在不同抽运光能量密度下的太赫兹脉冲时域信号, 抽运激光的能量密度改变范围为0.42—3.36 mJ/cm2; (b)太赫兹辐射脉冲的峰峰值随入射激光脉冲能量密度的关系, 图中的实心方块为实验数据, 红色虚线为拟合结果
Fig. 3. (a) Time domain signals emitted from a Ta(4 nm)/CoFeB(8 nm)/Ir(0.8 nm) heterostructure measured under different pump fluences in a range of 0.42–3.36 mJ/cm2; (b) the peak to peak values of THz emission as a function of incident pump fluence, the symbols are raw data and the red dashed line is a fitting curve.
图 4 (a) Ta(4 nm)/CoFeB(8 nm)/Ir(x = 0.4—10 nm)异质结的太赫兹辐射信号时域图; (b)蓝色圆圈为太赫兹脉冲峰峰值随Ir层厚度的依赖关系; 红色曲线为(1)式的拟合曲线
Fig. 4. (a) THz emission from Ta(4 nm)/CoFeB(8 nm)/Ir (x = 0.4—10 nm); (b) the peak to peak amplitudes of THz emission as a function of thickness of Ir layer, the red line is a fit using a spin transport model Eq.(1).
图 5 (a)基于不同厚度CoFeB/Ir异质结的模拟太赫兹辐射强度的等高线图; (b) Ir层为优化厚度1.1 nm时, 太赫兹辐射强度随CoFeB层厚度的依赖关系; (c) CoFeB层为优化厚度2.4 nm时, 太赫兹辐射强度随Ir层厚度的依赖关系
Fig. 5. (a) Contour plot of the simulated terahertz amplitude based on the CoFeB and Ir layer thickness; (b) terahertz amplitude of CoFeB/Ir heterostructure in terms of CoFeB thickess variation, measured at thickness of Ir is 1.1 nm; (c) terahertz amplitude of CoFeB/Ir heterostructure as a function of Ir thickess, measured at thickness of CoFeB is 2.4 nm.
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[1] Neu J, Schmuttenmaer C A 2018 J. Appl. Phys 124 231101
Google Scholar
[2] Lyu J M, Shen S Y, Chen L, Zhu Y M, Zhuang S L 2023 Photoni X 4 31
Google Scholar
[3] Zhu Y, Zang X F, Chi H X, Zhou Y W, Zhuang S L 2023 Light Adv. Manuf. 4 104
Google Scholar
[4] Zang X F, Yao B S, Chen L, Xie J Y, Guo X G, Balakin A V, Shkurinov A P, Zhuang S L 2021 Light Adv. Manuf. 2 148172
Google Scholar
[5] 韩张华, 孙开礼, 蔡阳健 2021 光学学报 41 258270
Google Scholar
Han Z H, Sun K L, Cai Y J 2021 Acta Opt. Sin. 41 258270
Google Scholar
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Google Scholar
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