Terahertz-field-induced spin currents: magnon-mode excitation and spintronic frequency conversion

Ruslan Salikhov; Igor Ilyakov; Thales V.A.G. de Olivera; Alexey Ponomaryov; Jan-Christoph Deinert; Olav Hellwig; Jürgen Lindner; Sergey Kovalev; Jürgen Faßbender

doi:10.1117/12.3028514

4 October 2024 Terahertz-field-induced spin currents: magnon-mode excitation and spintronic frequency conversion

Ruslan Salikhov, Igor Ilyakov, Thales V.A.G. de Olivera, Alexey Ponomaryov, Jan-Christoph Deinert, Olav Hellwig, Jürgen Lindner, Sergey Kovalev, Jürgen Faßbender

Author Affiliations +

Proceedings Volume PC13119, Spintronics XVII; PC1311911 (2024) https://doi.org/10.1117/12.3028514
Event: Nanoscience + Engineering, 2024, San Diego, California, United States

Abstract

Electric fields operating at THz frequencies hold significant promise for inducing ultrafast coherent excitations in magnetic heterostructures. Through the utilization of ferromagnetic/heavy metal (FM/HM) heterostructures, we have demonstrated that THz radiation (0.1 – 30 THz) exhibits combined functionality of microwaves and visible light. 1) Similar to microwaves, THz fields can effectively generate spin currents through the spin-Hall effect (SHE), resulting in an excitation of THz-frequency magnon modes. 2) Akin to visible light excitation, THz fields deposit heat, leading to the demagnetization of FM layers. Harnessing the THz-induced demagnetization as a spin current source within FM/HM heterostructures, we exploit the half-cycle THz electric field to incite spin currents, which subsequently transformed into picosecond charge currents through the inverse SHE within the HM layer. This conversion process results in the emission of a THz second harmonic signal, offering the THz spintronic frequency conversion.

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Ruslan Salikhov, Igor Ilyakov, Thales V.A.G. de Olivera, Alexey Ponomaryov, Jan-Christoph Deinert, Olav Hellwig, Jürgen Lindner, Sergey Kovalev, and Jürgen Faßbender "Terahertz-field-induced spin currents: magnon-mode excitation and spintronic frequency conversion", Proc. SPIE PC13119, Spintronics XVII, PC1311911 (4 October 2024); https://doi.org/10.1117/12.3028514

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