Strain-induced Anisotropic Terahertz Emission From a 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>Fe</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>211</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:mo>/</mml:mo><mml:mi>Pt</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>110</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>
 Bilayer

Liu, C.Q.; Lu, W.-T.; Wei, Zhengxing; Miao, Yu; Wang, P.; Xia, Hong Ying; Liu, Y.P.; Zeng, Feiyan; Zhang, J.R.; Zhou, Chao; Zhao, Haibin; Wu, Y. Z.; Yuan, Zhe; Qi, J.

doi:10.1103/physrevapplied.15.044022

Cited by 12 publications

(1 citation statement)

References 61 publications

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“…Subsequently, Battiato et al [21] theoretically proposed the superdiffusive spin transport model, in which the spin current carried by the laser-excited hot electrons plays a major role in the ultrafast spin dynamics. Soon after that, the nonlocal spin transport was found to be remarkably important in many ultrafast phenomena of magnetism and spintronics, such as the ultrafast demagnetization induced by nonmagnetic (NM) metal excitation [22], and spintronic terahertz emission [23,24]. In a Ni/Ru/Fe trilayer with parallel magnetization in both FM metals, Rudolf et al [25] found that laser-induced demagnetization in Ni instantaneously enhanced the magnetization of the Fe layer, indicating interlayer spin transfer carried by hot electrons.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast magnetization enhancement and spin current injection in magnetic multilayers by exciting the nonmagnetic metal

Lu,

Yuan,

2023

Sci. China Phys. Mech. Astron.

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A systematic investigation of spin injection behavior in Au/FM (FM = Fe and Ni) multilayers is performed using the superdiffusive spin transport theory. By exciting the nonmagnetic layer, the laser-induced hot electrons may transfer spin angular momentum into the adjacent ferromagnetic (FM) metals resulting in ultrafast demagnetization or enhancement. We find that these experimental phenomena sensitively depend on the particular interface reflectivity of hot electrons and may reconcile the different observations in the experiment. Stimulated by the ultrafast spin currents carried by the hot electrons, we propose the multilayer structures to generate highly spin-polarized currents for the development of future ultrafast spintronics devices. The spin polarization of the electric currents carried by the hot electrons can be significantly enhanced by the joint effects of bulk and interfacial spin filtering. Meanwhile, the intensity of the generated spin current can be optimized by varying the number of repeated stacking units and the thickness of each metallic layer.

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Section: Introductionmentioning

confidence: 99%

Ultrafast magnetization enhancement and spin current injection in magnetic multilayers by exciting the nonmagnetic metal

Lu,

Yuan,

2023

Sci. China Phys. Mech. Astron.

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Cascaded Amplification and Manipulation of Terahertz Emission by Flexible Spintronic Heterostructures

Jin

Peng

et al. 2022

Laser & Photonics Reviews

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Spintronic heterostructures consisting of ferromagnetic (FM) and nonmagnetic (NM) have become increasingly important devices for terahertz (THz) pulse generation, named as spintronic THz emitter (STE). The recycling of the laser pump energy is known to have a key impact on further improvement of the THz emission. Here, an efficient and practical approach to enhance and manipulate THz generation based on a cascaded Pt/CoFe/Ta trilayer fabricated on a flexible polyethylene terephthalate (PET) substrate is shown. Considering the refractive index n of PET is ≈1.61 at 1.55 eV and ≈1.75 at THz frequencies, it is anticipated that the femtosecond (fs) laser pulse propagates with a similar group velocity as the generated THz pulse. Therefore, the cascaded design enables all THz emission from each PET/STE propagating almost in‐phase and yields a 1.55 times amplification compared to a single PET/STE. Two proof‐of‐concept demonstrations are experimentally presented. First one, a metasurface can be assembled with the cascaded PET/STE to manipulate the THz signal. Second one, the cascaded PET/STE is used to perform a spectroscopic measurement of riboflavin. These demonstrations highlight the potential of flexible PET/STE for building blocks of advanced functionalities, such as compact THz emitters, THz spectroscopic, and imaging systems.

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Nanoengineered Spintronic-Metasurface Terahertz Emitters Enable Beam Steering and Full Polarization Control

et al. 2022

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The demand for emerging applications at the terahertz frequencies motivates the development of novel and multifunctional devices for the generation and manipulation of terahertz waves. In this work, we report the realization of multifunctional spintronic-metasurface emitters, which allow simultaneous beam-steering and full polarization control over a broadband terahertz beam. This is achieved through engineering individual meta-atoms with nanoscale magnetic heterostructures and, thus, implementing microscopical control over the laser-induced spin and charge dynamics. By arranging the spintronic meta-atoms in the metagrating geometry, the generated terahertz beam can be flexibly steered in space between different orders of diffraction. Furthermore, we demonstrate a simultaneous control over the terahertz polarization states at different emission angles and show that the two control capabilities are mutually independent of each other. The nanoengineered multifunctional terahertz emitter demonstrated in this work can provide a solution to the challenge associated with a growing variety of applications of terahertz technology.

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Strain-induced Anisotropic Terahertz Emission From a Fe(211)/Pt(110) Bilayer

Cited by 12 publications

References 61 publications

Ultrafast magnetization enhancement and spin current injection in magnetic multilayers by exciting the nonmagnetic metal

Ultrafast magnetization enhancement and spin current injection in magnetic multilayers by exciting the nonmagnetic metal

Cascaded Amplification and Manipulation of Terahertz Emission by Flexible Spintronic Heterostructures

Nanoengineered Spintronic-Metasurface Terahertz Emitters Enable Beam Steering and Full Polarization Control

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