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Coupling of teraher...
Coupling of terahertz light with nanometre-wavelength magnon modes via spin-orbit torque
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Salikhov, Ruslan (author)
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Ilyakov, Igor (author)
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Körber, Lukas (author)
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Kákay, Attila (author)
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Gallardo, Rodolfo A. (author)
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Ponomaryov, Alexey (author)
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Deinert, Jan-Christoph (author)
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de Oliveira, Thales V. A. G. (author)
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Lenz, Kilian (author)
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Fassbender, Jürgen (author)
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- Bonetti, Stefano (author)
- Stockholms universitet,Fysikum,Ca’ Foscari University of Venice, Italy
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Hellwig, Olav (author)
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Lindner, Jürgen (author)
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Kovalev, Sergey (author)
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(creator_code:org_t)
- 2023-01-30
- 2023
- English.
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In: Nature Physics. - : Springer Science and Business Media LLC. - 1745-2473 .- 1745-2481. ; 19:4, s. 529-535
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
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- Spin-based technologies can operate at terahertz frequencies but require manipulation techniques that work at ultrafast timescales to become practical. For instance, devices based on spin waves, also known as magnons, require efficient generation of high-energy exchange spin waves at nanometre wavelengths. To achieve this, a substantial coupling is needed between the magnon modes and an electro-magnetic stimulus such as a coherent terahertz field pulse. However, it has been difficult to excite non-uniform spin waves efficiently using terahertz light because of the large momentum mismatch between the submillimetre-wave radiation and the nanometre-sized spin waves. Here we improve the light–matter interaction by engineering thin films to exploit relativistic spin–orbit torques that are confined to the interfaces of heavy metal/ferromagnet heterostructures. We are able to excite spin-wave modes with frequencies of up to 0.6 THz and wavelengths as short as 6 nm using broadband terahertz radiation. Numerical simulations demonstrate that the coupling of terahertz light to exchange-dominated magnons originates solely from interfacial spin–orbit torques. Our results are of general applicability to other magnetic multilayered structures, and offer the prospect of nanoscale control of high-frequency signals.
Subject headings
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Salikhov, Ruslan
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Ilyakov, Igor
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Körber, Lukas
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Kákay, Attila
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Gallardo, Rodolf ...
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Ponomaryov, Alex ...
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show more...
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Deinert, Jan-Chr ...
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de Oliveira, Tha ...
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Lenz, Kilian
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Fassbender, Jürg ...
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Bonetti, Stefano
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Hellwig, Olav
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Lindner, Jürgen
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Kovalev, Sergey
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
- Articles in the publication
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Nature Physics
- By the university
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Stockholm University