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Manipulating superconductivity in magnetic nanostructures in and out of equilibrium

Ouassou, Jabir Ali
Doctoral thesis
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http://hdl.handle.net/11250/2591114
Date
2019
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  • Institutt for fysikk [2565]
Abstract
We consider nanostructures that are constructed from superconducting, ferromagnetic, and spin–orbit-coupled materials. These structures are analyzed both theoretically and numerically, under both equilibrium and nonequilibrium conditions. Special emphasis is placed on how one can exert control over the superconducting properties of these systems. For instance, this includes developing new ways to toggle superconductivity on and off via electric or magnetic input signals, and new ways to shape the charge and spin supercurrents flowing through these systems. The thesis itself provides an introduction to how we performed our calculations, as well as a summary of some interesting research results. The main body of research consists of 15 enclosed publications, where we go into more detail on each specific project.
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Paper 1: Jacobsen, Sol; Ouassou, Jabir Ali; Linder, Jacob. Superconducting order in magnetic heterostructures. I: Advanced magnetic and optical materials. John Wiley & Sons 2016 ISBN 9781119241966. s. 1-46 Copyright © 2017 Scrivener Publishing LLC. All rights reserved. https://doi.org/10.1002/9781119241966.ch1

Paper 2: Jacobsen, Sol; Ouassou, Jabir Ali; Linder, Jacob. Critical temperature and tunneling spectroscopy of superconductor-ferromagnet hybrids with intrinsic Rashba-Dresselhaus spin-orbit coupling. Physical Review B. Condensed Matter and Materials Physics 2015 ;Volum 92.(2) https://doi.org/10.1103/PhysRevB.92.024510

Paper 3: Ouassou, Jabir Ali; Di Bernardo, Angelo; Robinson, Jason W.A.; Linder, Jacob. Electric control of superconducting transition through a spin-orbit coupled interface. Scientific Reports 2016 ;Volum 6. This work is licensed under a Creative Commons Attribution 4.0 International License. (CC BY 4.0) https://doi.org/10.1038/srep29312

Paper 4: Banerjee, Niladri; Ouassou, Jabir Ali; Zhu, Yi; Stelmashenko, N. A.; Linder, Jacob; Blamire, Mark G.. Controlling the superconducting transition by spin-orbit coupling. Physical Review B 2018 ;Volum 97.(18) s. 184521-1-184521-8 https://doi.org/10.1103/PhysRevB.97.184521

Paper 5: Linder, Jacob; Amundsen, Morten; Ouassou, Jabir Ali. Microwave control of the superconducting proximity effect and minigap in magnetic and normal metals. Scientific Reports 2016 ;Volum 6 This work is licensed under a Creative Commons Attribution 4.0 International License. (CC BY 4.0) https://doi.org/10.1038/srep38739

Paper 6: Amundsen, Morten; Ouassou, Jabir Ali; Linder, Jacob. Analytically determined topological phase diagram of the proximity-induced gap in diffusive n-terminal Josephson junctions. Scientific Reports 2017 ;Volum 7. This work is licensed under a Creative Commons Attribution 4.0 International License. (CC BY 4.0) https://doi.org/10.1038/srep40578

Paper 7: Pal, Avradeep; Ouassou, Jabir Ali; Eschrig, Matthias; Linder, Jacob; Blamire, Mark G.. Spectroscopic evidence of odd frequency superconducting order. Scientific Reports 2017 ;Volum 7 This work is licensed under a Creative Commons Attribution 4.0 International License. (CC BY 4.0) https://doi.org/10.1038/srep40604

Paper 8: Ouassou, Jabir Ali; Pal, Avradeep; Blamire, Mark; Eschrig, Matthias; Linder, Jacob. Triplet Cooper pairs induced in diffusive s-wave superconductors interfaced with strongly spin-polarized magnetic insulators or half-metallic ferromagnets. Scientific Reports 2017 ;Volum 7.(1) This work is licensed under a Creative Commons Attribution 4.0 International License. (CC BY 4.0) https://doi.org/10.1038/s41598-017-01330-1

Paper 9: Ouassou, Jabir Ali; Jacobsen, Sol; Linder, Jacob. Conservation of spin supercurrents in superconductors. Physical Review B 2017 ;Volum 96.(9) https://doi.org/10.1103/PhysRevB.96.094505

Paper 10: Ouassou, Jabir Ali; Linder, Jacob. Spin-switch Josephson junctions with magnetically tunable sin(δφ/n) current-phase relation. Physical Review B 2017 ;Volum 96.(6) https://doi.org/10.1103/PhysRevB.96.064516

Paper 11: Lahabi, Kaveh; Amundsen, Morten; Ouassou, Jabir Ali; Beukers, Ewout; Pleijster, Menno; Linder, Jacob; Alkemade, Paul; Aarts, Jan. Controlling supercurrents and their spatial distribution in ferromagnets. Nature Communications 2017 ;Volum 8. - This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0) https://doi.org/10.1038/s41467-017-02236-2

Paper 12: Amundsen, Morten; Ouassou, Jabir Ali; Linder, Jacob. Field-free nucleation of antivortices and giant vortices in non-superconducting materials. Physical Review Letters 2018 ;Volum 120.(20) https://doi.org/10.1103/PhysRevLett.120.207001

Paper 13: Ouassou, Jabir Ali; Vethaak, Tom Doekle; Linder, Jacob. Voltage-induced thin-film superconductivity in high magnetic fields. Physical Review B 2018 ;Volum 98.(14) s. 1-15 https://doi.org/10.1103/PhysRevB.98.144509

Paper 14: Ouassou, J.A.; Linder,J.; Voltage control of superconducting exchange interaction and anomalous Josephson effect arXiv:1810.02820

Paper 15: Ouassou, J.A.; Robinson; J.W.A.; Linder,J.; Controlling spin supercurrents via nonequilibrium spin injection arXiv:1810.08623
Publisher
NTNU
Series
Doctoral theses at NTNU;2019:57

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