Spintronics Based Terahertz Sources

Wang, Maorong; Zhang, Yifan; Guo, Leilei; Lv, Mengqi; Wang, Peng; Wang, Xia

doi:10.3390/cryst12111661

Cited by 3 publications

(2 citation statements)

References 94 publications

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“…Finally, in Figure 4d, we plot the Fourier transform of the four spectra shown in Figure 4c and find the same broad band emission in the 0–4 THz range which is comparable to other THz spintronic emitters. [ 49 ] In order to study the influence of the ferromagnetic layer and deposition technique on THz emission, we performed the same measurements using 3 nm of cobalt deposited in situ on 10 ML of PtSe 2 by electron beam evaporation (see Supporting Information). We find very similar results showing that the ferromagnetic layer and deposition method have almost no influence on THz emission from PtSe 2 .…”

Section: Resultsmentioning

confidence: 99%

Atomic‐Layer Controlled Transition from Inverse Rashba–Edelstein Effect to Inverse Spin Hall Effect in 2D PtSe₂ Probed by THz Spintronic Emission

Abdukayumov,

Mičica,

Ibrahim

et al. 2024

Advanced Materials

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Two‐dimensional (2D) materials, such as transition metal dichalcogenides (TMDs), are ideal platforms for spin‐charge conversion (SCC) as they possess strong spin‐orbit coupling (SOC), reduced dimensionality and crystal symmetries as well as tuneable band structure, compared to metallic structures. Moreover, SCC can be tuned with the number of layers, electric field or strain. Here, we study spin‐to‐charge conversion in epitaxially grown 2D PtSe2 by THz spintronic emission since its 1T crystal symmetry and strong SOC favor SCC. High quality of as‐grown PtSe2 layers is demonstrated, followed by in‐situ ferromagnet deposition by sputtering that leaves the PtSe2 unaffected, resulting in well‐defined clean interfaces as evidenced with extensive characterization. Through this atomic growth control and using THz spintronic emission, the unique thickness dependent electronic structure of PtSe2 allows the control of SCC. Indeed, we demonstrate the transition from the inverse Rashba‐Edelstein effect (IREE) in 1‐3 monolayers (ML) to the inverse spin Hall effect (ISHE) in multilayers (>3 ML) of PtSe2 enabling the extraction of the perpendicular spin diffusion length and relative strength of IREE and ISHE. This band structure flexibility makes PtSe2 an ideal candidate to explore the underlying mechanisms and engineering of the SCC but also to develop tuneable THz spintronic emitters.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Atomic‐Layer Controlled Transition from Inverse Rashba–Edelstein Effect to Inverse Spin Hall Effect in 2D PtSe₂ Probed by THz Spintronic Emission

Abdukayumov,

Mičica,

Ibrahim

et al. 2024

Advanced Materials

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“…These THz pulses (regardless of their energy) are generated by photoconductive antennas 15 , by laser-induced plasma 16 , in spintronic structures 17 , and by optical rectification in nonlinear crystals 18 – 22 , all of them driven by ultrashort laser pulses. Photoconductive antennas, mostly used in TDTS devices, generate single-cycle pulses with a spectral bandwidth of 4–6 THz, with pulse energies in the sub-pJ range 15 .…”

Section: Introductionmentioning

confidence: 99%

Tilted pulse front pumping techniques for efficient terahertz pulse generation

Tóth,

Polónyi,

Hebling

2023

Light Sci Appl

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Optical rectification of femtosecond laser pulses has emerged as the dominant technique for generating single- and few-cycle terahertz (THz) pulses. The advent of the tilted pulse front pumping (TPFP) velocity matching technique, proposed and implemented two decades ago, has ushered in significant advancements of these THz sources, which are pivotal in the realm of THz pump-probe and material control experiments, which need THz pulses with microjoule energies and several hundred kV/cm electric field strengths. Furthermore, these THz sources are poised to play a crucial role in the realization of THz-driven particle accelerators, necessitating millijoule-level pulses with tens of MV/cm electric field strengths. TPFP has enabled the efficient velocity matching in lithium niobate crystals renowned for their extraordinary high nonlinear coefficient. Moreover, its adaptation to semiconductor THz sources has resulted in a two-hundred-times enhancement in conversion efficiency. In this comprehensive review, we present the seminal achievements of the past two decades. We expound on the conventional TPFP setup, delineate its scaling limits, and elucidate the novel generation TPFP configurations proposed to surmount these constraints, accompanied by their preliminary outcomes. Additionally, we provide an in-depth analysis of the THz absorption, refractive index, and nonlinear coefficient spectra of lithium niobate and widely used semiconductors employed as THz generators, which dictate their suitability as THz sources. We underscore the far-reaching advantages of tilted pulse front pumping, not only for LN and semiconductor-based THz sources but also for selected organic crystal-based sources and Yb-laser-pumped GaP sources, previously regarded as velocity-matched in the literature.

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Demonstration of high-throughput magnetic hysteresis measurements based on spintronic THz emission

DeCamp,

Bhatt,

Hossain

et al. 2023

Journal of Applied Physics

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Spintronic terahertz (THz) emitters have been shown to be a cost-efficient source for use in time-domain THz spectroscopy. The use of external magnetic fields to control the polarity of the THz emission provides an opportunity to measure the magnetization of spintronic materials as well as shaping THz emission. Here, we demonstrate an efficient method of measuring magnetic hysteresis with material sensitivity and speed several orders of magnitude greater than typical magnetometry methods. In addition, we utilize the rapid control of material magnetization for lock-in detection in time-domain THz spectroscopy of spintronic emitters. The ability to rapidly control and measure the material magnetization on very small volumes provides an opportunity to study magnetic hetero-structures with sub-micron spatial resolution.

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Spintronics Based Terahertz Sources

Cited by 3 publications

References 94 publications

Atomic‐Layer Controlled Transition from Inverse Rashba–Edelstein Effect to Inverse Spin Hall Effect in 2D PtSe₂ Probed by THz Spintronic Emission

Atomic‐Layer Controlled Transition from Inverse Rashba–Edelstein Effect to Inverse Spin Hall Effect in 2D PtSe₂ Probed by THz Spintronic Emission

Tilted pulse front pumping techniques for efficient terahertz pulse generation

Demonstration of high-throughput magnetic hysteresis measurements based on spintronic THz emission

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Spintronics Based Terahertz Sources

Cited by 3 publications

References 94 publications

Atomic‐Layer Controlled Transition from Inverse Rashba–Edelstein Effect to Inverse Spin Hall Effect in 2D PtSe2 Probed by THz Spintronic Emission

Atomic‐Layer Controlled Transition from Inverse Rashba–Edelstein Effect to Inverse Spin Hall Effect in 2D PtSe2 Probed by THz Spintronic Emission

Tilted pulse front pumping techniques for efficient terahertz pulse generation

Demonstration of high-throughput magnetic hysteresis measurements based on spintronic THz emission

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Atomic‐Layer Controlled Transition from Inverse Rashba–Edelstein Effect to Inverse Spin Hall Effect in 2D PtSe₂ Probed by THz Spintronic Emission

Atomic‐Layer Controlled Transition from Inverse Rashba–Edelstein Effect to Inverse Spin Hall Effect in 2D PtSe₂ Probed by THz Spintronic Emission