Magnetization Dynamics in Proximity-Coupled Superconductor-Ferromagnet-Superconductor Multilayers
Golovchanskiy, I.A., Abramov, N.N., Stolyarov, V.S., Chichkov, V.I., Silaev, M., Shchetinin, I.V., Golubov, A.A., Ryazanov, V.V., Ustinov, A.V., & Kupriyanov, M.Yu. (2020). Magnetization Dynamics in Proximity-Coupled Superconductor-Ferromagnet-Superconductor Multilayers. Physical Review Applied, 14(2), Article 024086. https://doi.org/10.1103/PhysRevApplied.14.024086
Published inPhysical Review Applied
© 2020 American Physical Society
In this work, magnetization dynamics is studied in superconductor-ferromagnet-superconductor three-layered films in a wide frequency, field, and temperature ranges using the broad-band ferromagnetic resonance measurement technique. It is shown that in the presence of both superconducting layers and of superconducting proximity at both superconductor-ferromagnet interfaces a massive shift of the ferromagnetic resonance to higher frequencies emerges. The phenomenon is robust and essentially long-range: it has been observed for a set of samples with the thickness of ferromagnetic layer in the range from tens up to hundreds of nanometers. The resonance frequency shift is characterized by proximity-induced magnetic anisotropies: by the positive in-plane uniaxial anisotropy and by the drop of magnetization. The shift and the corresponding uniaxial anisotropy grow with the thickness of the ferromagnetic layer. For instance, the anisotropy reaches 0.27 T in experiment for a sample with a 350-nm-thick ferromagnetic layer, and about 0.4 T in predictions, which makes it a ferromagnetic film structure with the highest anisotropy and the highest natural resonance frequency ever reported. Various scenarios for the superconductivity-induced magnetic anisotropy are discussed. As a result, the origin of the phenomenon remains unclear. Application of the proximity-induced anisotropies in superconducting magnonics is proposed as a way for manipulations with a spin-wave spectrum. ...
PublisherAmerican Physical Society (APS)
ISSN Search the Publication Forum2331-7019
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Additional information about fundingThe authors acknowledge the Ministry of Science and Higher Education of the Russian Federation in the framework of the State Program (Project No. 0718-2020- 0025) for support in microwave experiments, the Russian Science Foundation (Project No. 20-69-47013) for support in theoretical studies, and the Russian Foundation for Basic Research (Projects No. 19-02-00316 and No. 19-02- 00981) for support in technology and preliminary sample characterization. ...
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