A1 Journal article (refereed)
Large enhancement of spin pumping due to the surface bound states in normal metal–superconductor structures (2020)


Silaev, Mikhail (2020). Large enhancement of spin pumping due to the surface bound states in normal metal–superconductor structures. Physical Review B, 102 (18), 180502. DOI: 10.1103/PhysRevB.102.180502


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Publication details

All authors or editors: Silaev, Mikhail

Journal or series: Physical Review B

ISSN: 2469-9950

eISSN: 2469-9969

Publication year: 2020

Volume: 102

Issue number: 18

Article number: 180502

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevB.102.180502

Open Access: Publication channel is not openly available

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/72639

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2008.06253


Abstract

We show that the spin pumping from ferromagnetic insulator into the adjacent metallic spin sink can be strongly stimulated by the superconducting correlations. The key physical mechanism responsible for this effect is the presence of Andreev bound states at the ferromagnetic insulator/superconductor interface. We consider the minimal model when these states appear because of the suppressed pairing constant within the interfacial normal layer. For thin normal layers we obtain a strongly peaked temperature dependence of the Gilbert damping coefficient which has been recently observed in such systems. For thicker normal layers the Gilbert damping monotonically increases down to the temperatures much smaller than the critical one. The suggested model paves the way to controlling the temperature dependence of the spin pumping by fabricating hybrid normal metal–superconductor spin sinks.


Keywords: superconductors; superconductivity; magnetic properties; spin (quantum mechanics)

Free keywords: spintronics; superconductivity


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Preliminary JUFO rating: 2


Last updated on 2020-17-11 at 08:41