Giant enhancement to spin battery effect in superconductor/ferromagnetic insulator systems
Ojajärvi, R., Heikkilä, T. T., Virtanen, P., & Silaev, M. A. (2021). Giant enhancement to spin battery effect in superconductor/ferromagnetic insulator systems. Physical Review B, 103(22), Article 224524. https://doi.org/10.1103/PhysRevB.103.224524
Published inPhysical Review B
©2021 American Physical Society
We develop a theory of the spin battery effect in superconductor/ferromagnetic insulator (SC/FI) systems taking into account the magnetic proximity effect. We demonstrate that the spin-energy mixing enabled by the superconductivity leads to the enhancement of spin accumulation by several orders of magnitude relative to the normal state. This finding can explain the recently observed giant inverse spin Hall effect generated by thermal magnons in the SC/FI system. We suggest a nonlocal electrical detection scheme which can directly probe the spin accumulation driven by the magnetization dynamics. We predict a giant Seebeck effect converting the magnon temperature bias into the nonlocal voltage signal. We also show how this can be used to enhance the sensitivity of magnon detection even up to the single-magnon level.
PublisherAmerican Physical Society (APS)
Publication in research information system
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Related funder(s)Academy of Finland; European Commission
Funding program(s)Research post as 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 fundingThis work was supported by the Academy of Finland Projects 297439 and 317118, the European Union’s Horizon 2020 Research andInnovation Framework Programme under Grant No. 800923(SUPERTED), and Jenny and Antti Wihuri Foundation. Thework of M.A.S. was supported by Russian Science Founda-tion (Grant No. 20-12-00053).
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