Superconductivity-enhanced spin pumping: Role of Andreev resonances
Abstract
Here we describe a simple hybrid superconductor–ferromagnetic-insulator structure manifesting spin-resolved Andreev bound states in which dynamic magnetization is employed to probe spin related physics. We show that, at low bias and below Tc, the transfer of spin angular momentum pumped by an externally driven ferromagnetic insulator is greatly affected by the formation of spin-resolved Andreev bound states. Our results indicate that these bound states capture the essential physics of condensate-facilitated spin flow. For finite thicknesses of the superconducting layer, comparable to the coherence length, resonant Andreev bound states render highly transmitting subgap spin transport channels. We point out that the resonant enhancement of the subgap transport channels establishes a prototype Fabry-Pérot resonator for spin pumping.
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1851600
- Grant/Contract Number:
- SC0012190
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 103; Journal Issue: 10; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; materials science; physics; Andreev reflection; superconductivity; spin pumping; magnetism; spintronics; spin generation
Citation Formats
Tanhayi Ahari, Mostafa, and Tserkovnyak, Yaroslav. Superconductivity-enhanced spin pumping: Role of Andreev resonances. United States: N. p., 2021.
Web. doi:10.1103/physrevb.103.l100406.
Tanhayi Ahari, Mostafa, & Tserkovnyak, Yaroslav. Superconductivity-enhanced spin pumping: Role of Andreev resonances. United States. https://doi.org/10.1103/physrevb.103.l100406
Tanhayi Ahari, Mostafa, and Tserkovnyak, Yaroslav. Mon .
"Superconductivity-enhanced spin pumping: Role of Andreev resonances". United States. https://doi.org/10.1103/physrevb.103.l100406. https://www.osti.gov/servlets/purl/1851600.
@article{osti_1851600,
title = {Superconductivity-enhanced spin pumping: Role of Andreev resonances},
author = {Tanhayi Ahari, Mostafa and Tserkovnyak, Yaroslav},
abstractNote = {Here we describe a simple hybrid superconductor–ferromagnetic-insulator structure manifesting spin-resolved Andreev bound states in which dynamic magnetization is employed to probe spin related physics. We show that, at low bias and below Tc, the transfer of spin angular momentum pumped by an externally driven ferromagnetic insulator is greatly affected by the formation of spin-resolved Andreev bound states. Our results indicate that these bound states capture the essential physics of condensate-facilitated spin flow. For finite thicknesses of the superconducting layer, comparable to the coherence length, resonant Andreev bound states render highly transmitting subgap spin transport channels. We point out that the resonant enhancement of the subgap transport channels establishes a prototype Fabry-Pérot resonator for spin pumping.},
doi = {10.1103/physrevb.103.l100406},
journal = {Physical Review. B},
number = 10,
volume = 103,
place = {United States},
year = {Mon Mar 15 00:00:00 EDT 2021},
month = {Mon Mar 15 00:00:00 EDT 2021}
}
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