Self-consistent solution for the magnetic exchange interaction mediated by a superconductor

Abstract We theoretically determine the magnetic exchange interaction between two ferromagnets coupled by a superconductor using a tight-binding lattice model. The main purpose of this study is to determine how the self-consistently determined superconducting state influences the exchange interactio...

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Autores principales:	Atousa Ghanbari, Vetle K. Risinggård, Jacob Linder
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8f497ff9706e49beaf8e409376c7183e
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spelling	oai:doaj.org-article:8f497ff9706e49beaf8e409376c7183e2021-12-02T13:20:22ZSelf-consistent solution for the magnetic exchange interaction mediated by a superconductor10.1038/s41598-021-83620-32045-2322https://doaj.org/article/8f497ff9706e49beaf8e409376c7183e2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-83620-3https://doaj.org/toc/2045-2322Abstract We theoretically determine the magnetic exchange interaction between two ferromagnets coupled by a superconductor using a tight-binding lattice model. The main purpose of this study is to determine how the self-consistently determined superconducting state influences the exchange interaction and the preferred ground-state of the system, including the role of impurity scattering. We find that the superconducting state eliminates RKKY-like oscillations for a sufficiently large superconducting gap, making the anti-parallel orientation the ground state of the system. Interestingly, the superconducting gap is larger in the parallel configuration than in the anti-parallel configuration, giving a larger superconducting condensation energy, even when the preferred ground state is anti-parallel. We also show that increasing the impurity concentration in the superconductor causes the exchange interaction to decrease, likely due to an increasing localization of the mediating quasiparticles in the superconductor.Atousa GhanbariVetle K. RisinggårdJacob LinderNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Atousa Ghanbari Vetle K. Risinggård Jacob Linder Self-consistent solution for the magnetic exchange interaction mediated by a superconductor
description	Abstract We theoretically determine the magnetic exchange interaction between two ferromagnets coupled by a superconductor using a tight-binding lattice model. The main purpose of this study is to determine how the self-consistently determined superconducting state influences the exchange interaction and the preferred ground-state of the system, including the role of impurity scattering. We find that the superconducting state eliminates RKKY-like oscillations for a sufficiently large superconducting gap, making the anti-parallel orientation the ground state of the system. Interestingly, the superconducting gap is larger in the parallel configuration than in the anti-parallel configuration, giving a larger superconducting condensation energy, even when the preferred ground state is anti-parallel. We also show that increasing the impurity concentration in the superconductor causes the exchange interaction to decrease, likely due to an increasing localization of the mediating quasiparticles in the superconductor.
format	article
author	Atousa Ghanbari Vetle K. Risinggård Jacob Linder
author_facet	Atousa Ghanbari Vetle K. Risinggård Jacob Linder
author_sort	Atousa Ghanbari
title	Self-consistent solution for the magnetic exchange interaction mediated by a superconductor
title_short	Self-consistent solution for the magnetic exchange interaction mediated by a superconductor
title_full	Self-consistent solution for the magnetic exchange interaction mediated by a superconductor
title_fullStr	Self-consistent solution for the magnetic exchange interaction mediated by a superconductor
title_full_unstemmed	Self-consistent solution for the magnetic exchange interaction mediated by a superconductor
title_sort	self-consistent solution for the magnetic exchange interaction mediated by a superconductor
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/8f497ff9706e49beaf8e409376c7183e
work_keys_str_mv	AT atousaghanbari selfconsistentsolutionforthemagneticexchangeinteractionmediatedbyasuperconductor AT vetlekrisinggard selfconsistentsolutionforthemagneticexchangeinteractionmediatedbyasuperconductor AT jacoblinder selfconsistentsolutionforthemagneticexchangeinteractionmediatedbyasuperconductor
_version_	1718393224429568000

Self-consistent solution for the magnetic exchange interaction mediated by a superconductor

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