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 editors: Ojajärvi, Risto; Bergeret, F. S.; Silaev, M. A.; Heikkilä, Tero T.
Journal or series: Physical Review Letters
ISSN: 0031-9007
eISSN: 1079-7114
Publication year: 2022
Publication date: 20/04/2022
Volume: 128
Issue number: 16
Article number: 167701
Publisher: American Physical Society (APS)
Publication country: United States
Publication language: English
DOI: https://doi.org/10.1103/PhysRevLett.128.167701
Publication open access: Not open
Publication channel open access:
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/81165
Publication is parallel published: https://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.
Keywords: superconductors; superconductivity; electromagnetic fields
Contributing organizations
Related projects
- Spin-kinetiikka suprajohteissa ja topologisissa supranesteissä
- Silaev, Mikhail
- Research Council of Finland
- Hybrid nanoelectronic systems in and out of the quantum limit
- Heikkilä, Tero
- Research Council of Finland
- Thermoelectric detector based on superconductor-ferromagnet heterostructures
- Heikkilä, Tero
- European Commission
Ministry reporting: Yes
VIRTA submission year: 2022
JUFO rating: 3