A1 Journal article (refereed)
Thermalization of hot electrons via interfacial electron-magnon interaction (2019)

Chakraborty, S., & Heikkilä, T. T. (2019). Thermalization of hot electrons via interfacial electron-magnon interaction. Physical Review B, 100(3), Article 035423. https://doi.org/10.1103/PhysRevB.100.035423

JYU authors or editors

Publication details

All authors or editors: Chakraborty, Subrata; Heikkilä, Tero T.

Journal or series: Physical Review B

ISSN: 2469-9950

eISSN: 2469-9969

Publication year: 2019

Volume: 100

Issue number: 3

Article number: 035423

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevB.100.035423

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/65159

Publication is parallel published: https://arxiv.org/abs/1904.05696

Abstract

Recent work on layered structures of superconductors (S) or normal metals (N) in contact with ferromagnetic insulators (FI) has shown how the properties of the previous can be strongly affected by the magnetic proximity effect due to the static FI magnetization. Here we show that such structures can also exhibit a new electron thermalization mechanism due to the coupling of electrons with the dynamic magnetization, i.e., magnons in FI. We here study the heat flow between the two systems and find that in thin films the heat conductance due to the interfacial electron-magnon collisions can dominate over the well-known electron-phonon coupling below a certain characteristic temperature that can be straightforwardly reached with present-day experiments. We also study the role of the magnon band gap and the induced spin-splitting field induced in S on the resulting heat conductance and show that heat balance experiments can reveal information about such quantities in a way quite different from typical magnon spectroscopy experiments.

Keywords: superconductors; magnetic properties; heat conduction

Free keywords: electron relaxation; transport phenomena; magnons; superconductors

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Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 2