Efficient metallic spintronic emitters of ultrabroadband terahertz radiation

Abstract

Terahertz electromagnetic radiation is extremely useful for numerous applications such as imaging and spectroscopy. Therefore, it is highly desirable to have an efficient table-top emitter covering the 1-to-30-THz window whilst being driven by a low-cost, low-power femtosecond laser oscillator. So far, all solid-state emitters solely exploit physics related to the electron charge and deliver emission spectra with substantial gaps. Here, we take advantage of the electron spin to realize a conceptually new terahertz source which relies on tailored fundamental spintronic and photonic phenomena in magnetic metal multilayers: ultrafast photo-induced spin currents, the inverse spin-Hall effect and a broadband Fabry-Pérot resonance. Guided by an analytical model, such spintronic route offers unique possibilities for systematic optimization. We find that a 5.8-nm-thick W/CoFeB/Pt trilayer generates ultrashort pulses fully covering the 1-to-30-THz range. Our novel source outperforms laser-oscillator-driven emitters such as ZnTe(110) crystals in terms of bandwidth, terahertz-field amplitude, flexibility, scalability and cost.

18 pages, 10 figures

References in corpus (3)

• Super-Diffusive Spin-Transport as a Mechanism of Ultrafast Demagnetization
• Giant Orbital Hall Effect in Transition Metals: Origin of Large Spin and Anomalous Hall Effects
• Anisotropic spin Hall effect from first principles

Cited by in corpus (164)

• Antiferromagnetic spintronics
• Interface-Induced Phenomena in Magnetism
• Roadmap of spin-orbit torques
• Antiferromagnetic opto-spintronics: Part of a collection of reviews on antiferromagnetic spintronics
• Perspective: Ultrafast magnetism and THz spintronics
• An Introduction to Spin Wave Computing
• Ultrafast spin-lasers
• Hyperspectral terahertz microscopy via nonlinear ghost imaging
• Powerful and Tunable THz Emitters Based on the Fe/Pt Magnetic Heterostructure
• Ultrabroadband single-cycle terahertz pulses with peak fields of 300 kV cm${}^{-1}$ from a metallic spintronic emitter
• Broadband terahertz generation via the interface inverse Rashba-Edelstein effect
• Optimized Spintronic Terahertz Emitters Based on Epitaxial Grown Fe/Pt Layer Structures
• Femtosecond formation dynamics of the spin Seebeck effect revealed by terahertz spectroscopy
• Ultrafast Spin-To-Charge Conversion at the Surface of Topological Insulator Thin Films
• Enhancement of Terahertz Photoconductive Antennas and Photomixers Operation by Optical Nanoantennas
• Time-domain observation of ballistic orbital-angular-momentum currents with giant relaxation length in tungsten
• Spintronic Sources of Ultrashort Terahertz Electromagnetic Pulses
• Terahertz spectroscopy for all-optical spintronic characterization of the spin-Hall-effect metals Pt, W and Cu${}_{80}$Ir${}_{20}$
• Terahertz spin currents and inverse spin Hall effect in thin-film heterostructures containing complex magnetic compounds
• Highly-efficient spintronic terahertz emitter enabled by metal-dielectric photonic crystal
• Spatial Sampling of Terahertz Fields with Sub-wavelength Accuracy via Probe Beam Encoding
• Ultrafast spin-currents and charge conversion at 3d-5d interfaces probed by time-domain terahertz spectroscopy
• Principles of spintronic THz emitters
• Efficient Terahertz Generation Using Fe/Pt Spintronic Emitters Pumped at Different Wavelengths
• Terahertz Emission from Compensated Magnetic Heterostructures
• Transient birefringence of liquids induced by terahertz electric-field torque on permanent molecular dipoles
• Phase-resolved Detection of Ultrabroadband THz Pulses inside a Scanning Tunneling Microscope Junction
• Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer
• THz emission from Co/Pt bilayers with varied roughness, crystal structure, and interface intermixing
• Terahertz emission from anomalous Hall effect in a single-layer ferromagnet
• Laser-induced torques in metallic ferromagnets
• Ultrafast high-harmonic nanoscopy of magnetization dynamics
• Modification of spintronic terahertz emitter performance through defect engineering
• Charge and spin dynamics driven by ultrashort extreme broadband pulses: a theory perspective
• Up to 70 THz bandwidth from implanted Ge photoconductive antenna excited by a fibre laser
• Pure spin currents in magnetically ordered insulator/normal metal heterostructures
• Ultrafast photothermoelectric effect in Dirac semimetallic Cd3As2 revealed by terahertz emission
• Theory of out-of-equilibrium electron and phonon dynamics in metals after ultrafast laser excitation
• Laser induced THz emission from femtosecond photocurrents in Co/ZnO/Pt and Co/Cu/Pt multilayers
• Active spintronic-metasurface terahertz emitters with tunable chirality
• Flexible generation of structured terahertz fields via programmable exchange-biased spintronic emitters
• Complex THz and DC inverse spin Hall effect in YIG/Cu${}_{1-x}$Ir${}_x$ bilayers across a wide concentration range
• Perfect optical absorption-enhanced magneto-optic Kerr effect microscopy
• Large Spin Hall Effect in an Amorphous Binary Alloy
• Ultrafast THz probing of nonlocal orbital current in transverse multilayer metallic heterostructures
• Electric Current Induced Ultrafast Demagnetization
• Interface reflectivity of a superdiffusive spin current in ultrafast demagnetization and THz emission
• Unifying ultrafast demagnetization and intrinsic Gilbert damping in Co/Ni bilayers with electronic relaxation near the Fermi surface
• Broadband terahertz probes of anisotropic magnetoresistance disentangle extrinsic and intrinsic contributions
• Bilayer-skyrmion-based design of neuron and synapse for spiking neural network
• Terahertz pulse generation with binary phase control in non-linear InAs metasurface
• Frequency-independent terahertz anomalous Hall effect in DyCo${}_5$, Co${}_{32}$Fe${}_{68}$ and Gd${}_{27}$Fe${}_{73}$ thin films from DC to 40 THz
• Simplified formulas for the generation of terahertz waves from semiconductor surfaces excited with a femtosecond laser
• Co${}_2$FeAl full Heusler compound based spintronic terahertz emitter
• Effective field analysis using the full angular spin-orbit torque magnetometry dependence
• Ultrafast spin-charge conversion at SnBi${}_2$Te${}_4$/Co topological insulator interfaces probed by terahertz emission spectroscopy
• A 2D van der Waals Material for Terahertz Emission with Giant Optical Rectification
• Enhancement of ultrafast demagnetization rate and Gilbert damping driven by femtosecond laser-induced spin currents in Fe81Ga19/Ir20Mn80 bilayers
• Average power scaling of THz spintronic emitters in reflection geometry
• Transition of laser-induced terahertz spin currents from torque- to conduction-electron-mediated transport
• Simulation of Hot-Carrier Dynamics and Terahertz Emission in Laser-Excited Metallic Bilayers
• Wavelength conversion through plasmon-coupled surface states
• THz pulses from optically excited Fe, Pt and Ta based Spintronic Heterostructures
• Emerging spintronics phenomena and applications
• 360° polarization control of terahertz spintronic emitters using uniaxial FeCo/TbCo2/FeCo trilayers
• Terahertz Emission From an Exchange-Coupled Synthetic Antiferromagnet
• Orbital Rashba effect as a platform for robust orbital photocurrents
• Spin-voltage-driven efficient terahertz spin currents from the magnetic Weyl semimetals Co${}_2$MnGa and Co${}_2$MnAl
• Spintronic emitters for super-resolution in THz-spectral imaging
• Non-Equilibrium Heat Transport in Pt and Ru Probed by an Ultrathin Co Thermometer
• Spintronic THz emitters based on transition metals and semi-metals/Pt multilayers
• Spin current driven by ultrafast magnetization of FeRh
• The importance of the interface for picosecond spin pumping in antiferromagnet-heavy metal heterostructures
• Femtosecond Thermal and Nonthermal Hot Electron Tunneling inside a Photoexcited Tunnel Junction
• Theory of inertial spin dynamics in anisotropic ferromagnets
• Direct evidence of terahertz emission arising from anomalous Hall effect
• Fully reversible magnetoelectric voltage controlled THz polarization rotation in magnetostrictive spintronic emitters on PMN-PT
• Imaging the ultrafast coherent control of a skyrmion crystal
• Temperature dependence of the interface spin Seebeck effect
• Impact of gigahertz and terahertz transport regimes on spin propagation and conversion in the antiferromagnet IrMn
• Fundamentals of magnon-based computing
• Nonrelativistic and nonmagnetic control of terahertz charge currents via electrical anisotropy in RuO2 and IrO2
• Optical Rectification and Electro-Optic Sampling in Quartz
• Terahertz cavity magnon polaritons
• Dynamical amplification of magnetoresistances and Hall currents up to the THz regime
• Accessing ultrafast spin-transport dynamics in copper using broadband terahertz spectroscopy
• Origins of electromagnetic radiation from spintronic terahertz emitters: A time-dependent density functional theory plus Jefimenko equations approach
• Verification of ultrafast spin transfer effects in FeNi alloys
• Transfer Matrix description of heterostructured spintronics Terahertz emission
• Charge and spin photocurrents in the Rashba model
• Spin-orbit coupling induced ultra-high harmonic generation from magnetic dynamics
• Maximizing the electromagnetic efficiency of spintronic terahertz emitters
• Impact of ultrafast transport on the high-energy states of a photoexcited topological insulator
• Annihilation of topological solitons in magnetism with spin wave burst finale: The role of nonequilibrium electrons causing nonlocal damping and spin pumping over ultrabroadband frequency range
• Modelling of Spintronic Terahertz Emitters as a function of spin generation and diffusion geometry
• Ultrafast spin dynamics in inhomogeneous systems: a density-matrix approach applied to Co/Cu interfaces
• Ultrafast magnetization reversal in ferromagnetic spin-valves: an s-d model perspective
• Spin-orbit torques and their associated effective fields from gigahertz to terahertz
• Charge and spin current pumping by ultrafast demagnetization dynamics
• Resonant Fully dielectric metasurfaces for ultrafast Terahertz pulse generation
• Laser-induced Demagnetization in van der Waals $XY$- and Ising-like Antiferromagnets NiPS${}_3$ and FePS${}_3$
• Spin to charge conversion at Rashba-split SrTiO${}_3$ interfaces from resonant tunneling
• Deciphering the origin of spin current in spintronic terahertz emitters and its imprint on their electromagnetic radiation via time-dependent density functional theory
• Observation of Terahertz Spin Hall Conductivity Spectrum in GaAs with Optical Spin Injection
• Efficient Generation of Intense Broadband Terahertz Pulses from Quartz
• Charge pumping driven by the laser-induced dynamics of the exchange splitting
• Negligible thermal contributions to the spin pumping signal in ferromagnetic metal-Platinum bilayers
• Evidence of Ultrashort Orbital Transport in Heavy Metals Revealed by Terahertz Emission Spectroscopy
• Investigation of Ultrafast Demagnetization and Gilbert Damping and their Correlation in Different Ferromagnetic Thin Films Grown Under Identical Conditions
• Free-Layer-Thickness-dependence of the Spin Galvanic Effect with Spin Rotation Symmetry
• High-harmonic generation in spin and charge current pumping at ferromagnetic or antiferromagnetic resonance in the presence of spin-orbit coupling
• Quantum-classical approach to spin and charge pumping and the ensuing radiation in THz spintronics: Example of ultrafast-light-driven Weyl antiferromagnet Mn${}_3$Sn
• Rigorous Signal Reconstruction in Terahertz Emission Spectroscopy
• Spin accumulation and dissipation excited by an ultrafast laser pulse
• Ring-Exchange Interaction Effects on Magnons in Dirac Magnet CoTiO${}_3$
• High-field THz source centered at 2.6 THz
• Controlling polarization of spintronic THz emitter by remanent magnetization texture
• Control of the Oscillatory Interlayer Exchange Interaction with Terahertz Radiation
• Laser-induced charge and spin photocurrents at BiAg${}_2$ surface: a first principles benchmark
• Inverse Rashba-Edelstein THz emission modulation induced by ferroelectricity in CoFeB/PtSe2/MoSe2//LiNbO3 systems
• Non-local control of spin-spin correlation in finite geometry helical edge
• Different spin relaxation property observed in linearly and circularly polarized laser induced terahertz emission from Bi/Co bilayer
• Revealing subterahertz atomic vibrations in quantum paraelectrics by surface-sensitive spintronic terahertz spectroscopy
• Ultra-low-current-density single-layer magnetic Weyl semimetal spin Hall nano-oscillators
• Rotating spintronic terahertz emitter optimized for microjoule pump-pulse energies and megahertz repetition rates
• Fundamental picture of the conduction mechanism in solid-state polymer electrolytes revealed by terahertz spectroscopy
• Manipulating terahertz phonon-polariton in the ultrastrong coupling regime with bound states in the continuum
• Ultrafast spin dynamics: complementing theoretical analyses by quantum-information measures
• Comparative Analysis of THz Signal Emission from SiO${}_2$/CoFeB/Metal Heterostructures: Wideband and High-Frequency THz Signal Advantage of PtBi-based Emitter
• Hybrid terahertz emitter for pulse shaping and chirality control
• Enhanced laser-induced single-cycle terahertz generation in a spintronic emitter with a gradient interface
• Giant inverse Faraday effect in Dirac semimetals
• Ultrafast spin-to-charge conversions of antiferromagnetic (111)-oriented $\mathrm{L}{1}_2$-$\mathrm{M}{\mathrm{n}}_3\mathrm{Ir}$
• Electric field effect on electron gas spins in two-dimensional magnets with strong spin-orbit coupling
• Spin injection characteristics of Py/graphene/Pt by gigahertz and terahertz magnetization dynamics driven by femtosecond laser pulse
• Ultrafast Electron Temperature Dynamics in Spintronic Terahertz Emitters Studied by Optical-Pump Terahertz-Probe Spectroscopy
• Emission of electromagnetic radiation due to spin-flip transitions in a ferromagnet
• Solid-State Biased Coherent Detection of Ultra-Broadband Terahertz Pulses for high repetition rate, low pulse energy lasers
• Magnetic domain scanning imaging using phase-sensitive THz-pulse detection
• Laser-driven few-cycle Terahertz sources with high average power
• Disentangling complex current pathways in a metallic Ru/Co bilayer nanostructure using THz spectroscopy
• Observation of spin Nernst photocurrents in topological insulators
• Emergent spin Hall conductivity in Tantalum-Rhenium alloys
• Coherent Spin Pumping Originated from Sub-Terahertz Néel Vector Dynamics in Easy Plane α-Fe2O3/Pt
• Nonclassical dynamics of Néel vector and magnetization accompanied by THz and high-harmonic radiation from ultrafast-light-driven NiO antiferromagnet insulator
• Terahertz time-domain signatures of the inverse Edelstein effect in topological-insulator|ferromagnet heterostructures
• Spin and Orbital Rashba response in ferroelectric polarized PtSe${}_2$/MoSe${}_2$/LiNbO${}_3$ heterostructures
• Ultrafast demagnetization of iron induced by optical vs terahertz pulses
• Terahertz Spin Transfer Torque Oscillator Based on a Synthetic Antiferromagnet
• Light-induced ultrafast magnetization dynamics in van der Waals antiferromagnetic CrSBr
• High-efficiency Pt${}_{75}$Au${}_{25}$-based spintronic terahertz emitters
• Enhancement of Spintronic Terahertz Emission via Annealing in Ferromagnetic Heterostructures
• Femtosecond control of terahertz spin-charge conversion in ferromagnetic heterostructures
• Broadband Magnetic-Manipulated Spintronic Terahertz Emitter with Arbitrarily Tunable Polarizations
• Optical and Terahertz Response of Carbon Nanostructures
• Correction of broadband terahertz electro-optic sampling with GaSe crystals
• Nonlinear Optical Effects Due to Magnetization Dynamics In a Ferromagnet
• Ghost spintronic THz-emitter-array microscope
• The spin Hall effect
• Optimizing spin-based terahertz emission from magnetic heterostructures
• Orbital Hybridization Induces Giant Cubic Rashba Effect at Cu/WO${}_3$ Interface
• A Narrowband Spintronic Terahertz Emitter based on Magnetoelastic Heterostructures
• Ultrafast lattice dynamics and electron-phonon coupling in platinum extracted with a global fitting approach for time-resolved polycrystalline diffraction data
• Active Magnetoelectric Control of Terahertz Spin Current