Terahertz spectroscopy for all-optical spintronic characterization of the spin-Hall-effect metals Pt, W and Cu${}_{80}$Ir${}_{20}$

Abstract

Identifying materials with an efficient spin-to-charge conversion is crucial for future spintronic applications. 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 ${\Theta }_{\text{SH}}$ and the spin-current relaxation length ${\lambda }_{\text{rel}}$. We develop an all-optical method with large sample throughput that allows us to extract ${\Theta }_{\text{SH}}$ and ${\lambda }_{\text{rel}}$. Employing terahertz spectroscopy, we characterize magnetic metallic heterostructures involving Pt, W and Cu${}_{80}$Ir${}_{20}$ in terms of their optical and spintronic properties. We furthermore find indications that the interface plays a minor role for the spin-current transmission. Our analytical model is validated by the good agreement with literature DC values. These findings establish terahertz emission spectroscopy as a reliable tool complementing the spintronics workbench.

Article for Special Issue on Spincaloritronic in the Journal of Physics D

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Cited by in corpus (33)

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• Spintronic Sources of Ultrashort Terahertz Electromagnetic Pulses
• Ultrafast spin-currents and charge conversion at 3d-5d interfaces probed by time-domain terahertz spectroscopy
• Principles of spintronic THz emitters
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• Broadband terahertz probes of anisotropic magnetoresistance disentangle extrinsic and intrinsic contributions
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• Terahertz Emission From an Exchange-Coupled Synthetic Antiferromagnet
• Spin-voltage-driven efficient terahertz spin currents from the magnetic Weyl semimetals Co${}_2$MnGa and Co${}_2$MnAl
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• Theory of spin-Hall magnetoresistance in the AC (terahertz) regime
• Maximizing the electromagnetic efficiency of spintronic terahertz emitters
• Modelling of Spintronic Terahertz Emitters as a function of spin generation and diffusion geometry
• Laser-induced ultrafast transport and demagnetization at the earliest time: First-principles and real-time investigation
• Removal of spectral distortion due to echo for ultrashort pulses propagating through multilayer structures with thick substrate
• Terahertz charge and spin transport in metallic ferromagnets: the role of crystalline and magnetic order
• Different spin relaxation property observed in linearly and circularly polarized laser induced terahertz emission from Bi/Co bilayer
• Rotating spintronic terahertz emitter optimized for microjoule pump-pulse energies and megahertz repetition rates
• Spin Hall angle in single-layer graphene
• Comparative Analysis of THz Signal Emission from SiO${}_2$/CoFeB/Metal Heterostructures: Wideband and High-Frequency THz Signal Advantage of PtBi-based Emitter
• Ultrafast spin-to-charge conversions of antiferromagnetic (111)-oriented $\mathrm{L}{1}_2$-$\mathrm{M}{\mathrm{n}}_3\mathrm{Ir}$
• Self-induced spin pumping and inverse spin Hall effect in single FePt thin films
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• A Narrowband Spintronic Terahertz Emitter based on Magnetoelastic Heterostructures