Search results for "terahertz emission"

showing 3 items of 3 documents

Terahertz spectroscopy for all-optical spintronic characterization of the spin-Hall-effect metals Pt, W and Cu80Ir20

2018

Identifying materials with an efficient spin-to-charge conversion is crucial for future spintronic applications. In this respect, the spin Hall effect is a central mechanism as it allows for the interconversion of spin and charge currents. Spintronic material research aims at maximizing its efficiency, quantified by the spin Hall angle and the spin-current relaxation length . We develop an all-optical contact-free method with large sample throughput that allows us to extract and . Employing terahertz spectroscopy and an analytical model, magnetic metallic heterostructures involving Pt, W and Cu80Ir20 are characterized in terms of their optical and spintronic properties. The validity of our …

Materials scienceAcoustics and Ultrasonics530 Physicsterahertz emission spectroscopyFOS: Physical sciences02 engineering and technology01 natural sciencesTransition metalHall effect0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)ultrafast spincaloritronics010306 general physicsSpectroscopyComputingMilieux_MISCELLANEOUSterahertz emission spectroscopy; terahertz transmission spectroscopy; ultrafast spintronics; ultrafast spincaloritronicsCondensed Matter - Materials ScienceSpintronicsCondensed Matter - Mesoscale and Nanoscale Physicsbusiness.industryRelaxation (NMR)Refractory metalsMaterials Science (cond-mat.mtrl-sci)621021001 nanoscience & nanotechnologyCondensed Matter Physics530 PhysikCondensed Matter::Mesoscopic Systems and Quantum Hall Effect3. Good healthSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsTerahertz spectroscopy and technologyterahertz transmission spectroscopyultrafast spintronicsSpin Hall effect[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]Optoelectronics0210 nano-technologybusiness
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Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer

2018

We systematically study the pump-wavelength dependence of terahertz pulse generation in thin-film spintronic THz emitters composed of a ferromagnetic Fe layer between adjacent nonmagnetic W and Pt layers. We find that the efficiency of THz generation is essentially at for excitation by 150 fs pulses with center wavelengths ranging from 900 to 1500 nm, demonstrating that the spin current does not depend strongly on the pump photon energy. We show that the inclusion of dielectric overlayers of TiO2 and SiO2, designed for a particular excitation wavelength, can enhance the terahertz emission by a factor of of up to two in field.

Materials scienceTerahertz radiationFOS: Physical sciencesPhysics::Opticsterahertz emission02 engineering and technologyDielectricpump wavelength01 natural sciences530Condensed Matter::Materials Science0103 physical sciencesStimulated emissionCommon emitter010302 applied physicsSpintronicsbusiness.industry021001 nanoscience & nanotechnologyspintronic trilayerWavelengthTransmission (telecommunications)Physics::Accelerator PhysicsOptoelectronics0210 nano-technologybusinessIntensity (heat transfer)Optics (physics.optics)Physics - Optics
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Terahertz Spin‐to‐Charge Conversion by Interfacial Skew Scattering in Metallic Bilayers

2021

The efficient conversion of spin to charge transport and vice versa is of major relevance for the detection and generation of spin currents in spin‐based electronics. Interfaces of heterostructures are known to have a marked impact on this process. Here, terahertz (THz) emission spectroscopy is used to study ultrafast spin‐to‐charge‐current conversion (S2C) in about 50 prototypical F|N bilayers consisting of a ferromagnetic layer F (e.g., Ni81Fe19, Co, or Fe) and a nonmagnetic layer N with strong (Pt) or weak (Cu and Al) spin‐orbit coupling. Varying the structure of the F/N interface leads to a drastic change in the amplitude and even inversion of the polarity of the THz charge current. Rem…

spectroscopyMaterials sciencespin-to-charge conversion530 PhysicsTerahertz radiationterahertz emission spectroscopyterahertz emission02 engineering and technologyElectron010402 general chemistry5307. Clean energy01 natural sciencesGeneral Materials ScienceSpectroscopySpin-½Condensed matter physicsScatteringMechanical EngineeringCharge (physics)Heterojunction530 Physik021001 nanoscience & nanotechnology0104 chemical sciencesskew scatteringFerromagnetismMechanics of Materialsinterface; skew scattering; spin-to-charge conversion; terahertz emission spectroscopyinterface0210 nano-technologyAdvanced Materials
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