Resonant thermal energy transfer to magnons in a ferromagnetic nanolayer.

Autor:	Kobecki M; Experimentelle Physik 2, Technische Universität Dortmund, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany. michal.kobecki@tu-dortmund.de., Scherbakov AV; Experimentelle Physik 2, Technische Universität Dortmund, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany. alexey.shcherbakov@tu-dortmund.de.; Ioffe Institute, Politechnycheskaya 26, St. Petersburg, Russian Federation, 194021. alexey.shcherbakov@tu-dortmund.de., Linnik TL; Department of Theoretical Physics, V.E. Lashkaryov Institute of Semiconductor Physics, Pr. Nauky 41, Kyiv, 03028, Ukraine., Kukhtaruk SM; Experimentelle Physik 2, Technische Universität Dortmund, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany.; Department of Theoretical Physics, V.E. Lashkaryov Institute of Semiconductor Physics, Pr. Nauky 41, Kyiv, 03028, Ukraine., Gusev VE; LAUM, CNRS UMR 6613, Le Mans Université, 72085, Le Mans, France., Pattnaik DP; School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, UK., Akimov IA; Experimentelle Physik 2, Technische Universität Dortmund, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany.; Ioffe Institute, Politechnycheskaya 26, St. Petersburg, Russian Federation, 194021., Rushforth AW; School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, UK., Akimov AV; School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, UK., Bayer M; Experimentelle Physik 2, Technische Universität Dortmund, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany.; Ioffe Institute, Politechnycheskaya 26, St. Petersburg, Russian Federation, 194021.
Jazyk:	angličtina
Zdroj:	Nature communications [Nat Commun] 2020 Aug 17; Vol. 11 (1), pp. 4130. Date of Electronic Publication: 2020 Aug 17.
DOI:	10.1038/s41467-020-17635-1
Abstrakt:	Energy harvesting is a concept which makes dissipated heat useful by transferring thermal energy to other excitations. Most of the existing principles are realized in systems which are heated continuously. We present the concept of high-frequency energy harvesting where the dissipated heat in a sample excites resonant magnons in a thin ferromagnetic metal layer. The sample is excited by femtosecond laser pulses with a repetition rate of 10 GHz, which results in temperature modulation at the same frequency with amplitude ~0.1 K. The alternating temperature excites magnons in the ferromagnetic nanolayer which are detected by measuring the net magnetization precession. When the magnon frequency is brought onto resonance with the optical excitation, a 12-fold increase of the amplitude of precession indicates efficient resonant heat transfer from the lattice to coherent magnons. The demonstrated principle may be used for energy harvesting in various nanodevices operating at GHz and sub-THz frequency ranges.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu