Coherent transfer of spin angular momentum by evanescent spin waves within antiferromagnetic NiO
| Autor: | Thorsten Hesjedal, D. M. Burn, Maciej Dąbrowski, Padraic Shafer, Z. Q. Qiu, Elke Arenholz, R. J. Hicken, Takafumi Nakano, Qian Li, Mengmeng Yang, Christoph Klewe, Gerrit van der Laan, Andreas Frisk, David G. Newman |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
General Physics
Terahertz radiation General Physics and Astronomy FOS: Physical sciences Applied Physics (physics.app-ph) 01 natural sciences 7. Clean energy Mathematical Sciences Engineering Spin wave 0103 physical sciences cond-mat.mes-hall Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Antiferromagnetism 010306 general physics Spin (physics) Physics Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Magnon Physics - Applied Physics Ferromagnetic resonance Amplitude Coherent control Physical Sciences Condensed Matter::Strongly Correlated Electrons physics.app-ph |
| Zdroj: | Physical review letters, vol 124, iss 21 |
| Popis: | Insulating antiferromagnets are efficient and robust conductors of spin current. To realise the full potential of these materials within spintronics, the outstanding challenges are to demonstrate scalability down to nanometric lengthscales and the transmission of coherent spin currents. Here, we report the coherent transfer of spin angular momentum by excitation of evanescent spin waves of GHz frequency within antiferromagnetic NiO at room temperature. Using element-specific and phase-resolved x-ray ferromagnetic resonance, we probe the injection and transmission of ac spin current, and demonstrate that insertion of a few nanometre thick epitaxial NiO(001) layer between a ferromagnet and non-magnet can even enhance the flow of spin current. Our results pave the way towards coherent control of the phase and amplitude of spin currents at the nanoscale, and enable the realization of spin-logic devices and spin current amplifiers that operate at GHz and THz frequencies. |
| Databáze: | OpenAIRE |
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