Dynamics of Two Ferromagnetic Insulators Coupled by Superconducting Spin Current
Ojajärvi, R., Bergeret, F. S., Silaev, M. A., & Heikkilä, T. T. (2022). Dynamics of Two Ferromagnetic Insulators Coupled by Superconducting Spin Current. Physical Review Letters, 128(16), Article 167701. https://doi.org/10.1103/PhysRevLett.128.167701
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Physical Review LettersDate
2022Copyright
© 2022 American Physical Society
A conventional superconductor sandwiched between two ferromagnets can maintain coherent equilibrium spin current. This spin supercurrent results from the rotation of odd-frequency spin correlations induced in the superconductor by the magnetic proximity effect. In the absence of intrinsic magnetization, the superconductor cannot maintain multiple rotations of the triplet component but instead provides a Josephson type weak link for the spin supercurrent. We determine the analog of the current-phase relation in various circumstances and show how it can be accessed in experiments on dynamic magnetization. In particular, concentrating on the magnetic hysteresis and the ferromagnetic resonance response, we show how the spin supercurrent affects the nonequilibrium dynamics of magnetization which depends on a competition between spin supercurrent mediated static exchange contribution and a dynamic spin pumping contribution. Depending on the outcome of this competition, a mode crossing in the system can either be an avoided crossing or mode locking.
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https://converis.jyu.fi/converis/portal/detail/Publication/144351428
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Related funder(s)
European Commission; Research Council of FinlandFunding program(s)
FET Future and Emerging Technologies, H2020; Academy Research Fellow, AoF; Academy Project, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about funding
This work was supported by the Academy of Finland Projects 297439 and 317118, the European Union’s Horizon 2020 Research and Innovation Framework Programme under Grant No. 800923 (SUPERTED), and Jenny and Antti Wihuri Foundation. F. S. B. acknowledges funding by the Spanish Ministerio de Ciencia e Innovacion (MICINN) through Projects FIS2017-82804-P and PID2020-114252GB-I00 (SPIRIT).License
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