High-Throughput Techniques for Measuring the Spin Hall Effect
| Autor: | Björn Gliniors, Sebastian Wimmer, Lukas Liensberger, Tom Seifert, Mathias Weiler, Oliver Gueckstock, Tobias Kampfrath, Hubert Ebert, Markus Meinert |
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| Rok vydání: | 2020 |
| Předmět: |
Spin torque
Terahertz radiation FOS: Physical sciences General Physics and Astronomy Inverse Spin Hall effect 02 engineering and technology Metrology 01 natural sciences 7. Clean energy Ferromagnetic resonance Spin generation Magnetization Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Hall bar Spin-orbit coupling 010306 general physics Spin-½ Physics Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Spintronics Materials Science (cond-mat.mtrl-sci) Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Ferromagnetism Terahertz spectroscopy Condensed Matter::Strongly Correlated Electrons 0210 nano-technology |
| Zdroj: | Physical Review Applied |
| ISSN: | 2331-7019 |
| DOI: | 10.1103/physrevapplied.14.064011 |
| Popis: | The spin Hall effect in heavy-metal thin films is routinely employed to convert charge currents into transverse spin currents and can be used to exert torque on adjacent ferromagnets. Conversely, the inverse spin Hall effect is frequently used to detect spin currents by charge currents in spintronic devices up to the terahertz frequency range. Numerous techniques to measure the spin Hall effect or its inverse were introduced, most of which require extensive sample preparation by multi-step lithography. To enable rapid screening of materials in terms of charge-to-spin conversion, suitable high-throughput methods for measuring the spin Hall angle are required. Here, we compare two lithography-free techniques, terahertz emission spectroscopy and broadband ferromagnetic resonance, to standard harmonic Hall measurements and theoretical predictions using the binary-alloy series Au$_x$Pt$_{1-x}$ as benchmark system. Despite being highly complementary, we find that all three techniques yield a spin Hall angle with approximately the same $x$~dependence, which is also consistent with first-principles calculations. Quantitative discrepancies are discussed in terms of magnetization orientation and interfacial spin-memory loss. Comment: 9 pages, 3 figures |
| Databáze: | OpenAIRE |
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