A1 Journal article (refereed)
Dynamics of Two Ferromagnetic Insulators Coupled by Superconducting Spin Current (2022)


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


JYU authors or editors


Publication details

All authors or editorsOjajärvi, Risto; Bergeret, F. S.; Silaev, M. A.; Heikkilä, Tero T.

Journal or seriesPhysical Review Letters

ISSN0031-9007

eISSN1079-7114

Publication year2022

Publication date20/04/2022

Volume128

Issue number16

Article number167701

PublisherAmerican Physical Society (APS)

Publication countryUnited States

Publication languageEnglish

DOIhttps://doi.org/10.1103/PhysRevLett.128.167701

Publication open accessNot open

Publication channel open access

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/81165

Publication is parallel publishedhttps://arxiv.org/abs/2107.09959


Abstract

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.


Keywordssuperconductorssuperconductivityelectromagnetic fields


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Ministry reportingYes

Reporting Year2022

JUFO rating3


Last updated on 2024-03-04 at 19:06