A1 Journal article (refereed)
Giant enhancement to spin battery effect in superconductor/ferromagnetic insulator systems (2021)

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

JYU authors or editors

Publication details

All authors or editors: Ojajärvi, Risto; Heikkilä, Tero T.; Virtanen, P.; Silaev, M. A.

Journal or series: Physical Review B

ISSN: 2469-9950

eISSN: 2469-9969

Publication year: 2021

Publication date: 22/06/2021

Volume: 103

Issue number: 22

Article number: 224524

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevB.103.224524

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/76942

Abstract

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.

Keywords: superconductors; insulators (electrical devices); magnetic properties; spin (quantum mechanics)

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Related projects

Ministry reporting: Yes

VIRTA submission year: 2021

JUFO rating: 2