Pt and CoB trilayer Josephson $$\pi $$ π junctions with perpendicular magnetic anisotropy

Pt and CoB trilayer Josephson $$\pi $$ π junctions with perpendicular magnetic anisotropy

Abstract We report on the electrical transport properties of Nb based Josephson junctions with Pt/Co $$_{68}$$ 68 B $$_{32}$$ 32 /Pt ferromagnetic barriers. The barriers exhibit perpendicular magnetic anisotropy, which has the main advantage for potential applications over magnetisation in-plane sys...

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Autores principales: N. Satchell, T. Mitchell, P. M. Shepley, E. Darwin, B. J. Hickey, G. Burnell
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
Materias:
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Science
Q
Acceso en línea:https://doaj.org/article/000496a38fd74c318e24f8fff2a8e464
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spelling oai:doaj.org-article:000496a38fd74c318e24f8fff2a8e4642021-12-02T14:42:01ZPt and CoB trilayer Josephson $$\pi $$ π junctions with perpendicular magnetic anisotropy10.1038/s41598-021-90432-y2045-2322https://doaj.org/article/000496a38fd74c318e24f8fff2a8e4642021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90432-yhttps://doaj.org/toc/2045-2322Abstract We report on the electrical transport properties of Nb based Josephson junctions with Pt/Co $$_{68}$$ 68 B $$_{32}$$ 32 /Pt ferromagnetic barriers. The barriers exhibit perpendicular magnetic anisotropy, which has the main advantage for potential applications over magnetisation in-plane systems of not affecting the Fraunhofer response of the junction. In addition, we report that there is no magnetic dead layer at the Pt/Co $$_{68}$$ 68 B $$_{32}$$ 32 interfaces, allowing us to study barriers with ultra-thin Co $$_{68}$$ 68 B $$_{32}$$ 32 . In the junctions, we observe that the magnitude of the critical current oscillates with increasing thickness of the Co $$_{68}$$ 68 B $$_{32}$$ 32 strong ferromagnetic alloy layer. The oscillations are attributed to the ground state phase difference across the junctions being modified from zero to $$\pi $$ π . The multiple oscillations in the thickness range $$0.2~\leqslant ~d_\text {CoB}~\leqslant ~1.4$$ 0.2 ⩽ d CoB ⩽ 1.4  nm suggests that we have access to the first zero- $$\pi $$ π and $$\pi $$ π -zero phase transitions. Our results fuel the development of low-temperature memory devices based on ferromagnetic Josephson junctions.N. SatchellT. MitchellP. M. ShepleyE. DarwinB. J. HickeyG. BurnellNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
N. Satchell
T. Mitchell
P. M. Shepley
E. Darwin
B. J. Hickey
G. Burnell
Pt and CoB trilayer Josephson $$\pi $$ π junctions with perpendicular magnetic anisotropy
description Abstract We report on the electrical transport properties of Nb based Josephson junctions with Pt/Co $$_{68}$$ 68 B $$_{32}$$ 32 /Pt ferromagnetic barriers. The barriers exhibit perpendicular magnetic anisotropy, which has the main advantage for potential applications over magnetisation in-plane systems of not affecting the Fraunhofer response of the junction. In addition, we report that there is no magnetic dead layer at the Pt/Co $$_{68}$$ 68 B $$_{32}$$ 32 interfaces, allowing us to study barriers with ultra-thin Co $$_{68}$$ 68 B $$_{32}$$ 32 . In the junctions, we observe that the magnitude of the critical current oscillates with increasing thickness of the Co $$_{68}$$ 68 B $$_{32}$$ 32 strong ferromagnetic alloy layer. The oscillations are attributed to the ground state phase difference across the junctions being modified from zero to $$\pi $$ π . The multiple oscillations in the thickness range $$0.2~\leqslant ~d_\text {CoB}~\leqslant ~1.4$$ 0.2 ⩽ d CoB ⩽ 1.4  nm suggests that we have access to the first zero- $$\pi $$ π and $$\pi $$ π -zero phase transitions. Our results fuel the development of low-temperature memory devices based on ferromagnetic Josephson junctions.
format article
author N. Satchell
T. Mitchell
P. M. Shepley
E. Darwin
B. J. Hickey
G. Burnell
author_facet N. Satchell
T. Mitchell
P. M. Shepley
E. Darwin
B. J. Hickey
G. Burnell
author_sort N. Satchell
title Pt and CoB trilayer Josephson $$\pi $$ π junctions with perpendicular magnetic anisotropy
title_short Pt and CoB trilayer Josephson $$\pi $$ π junctions with perpendicular magnetic anisotropy
title_full Pt and CoB trilayer Josephson $$\pi $$ π junctions with perpendicular magnetic anisotropy
title_fullStr Pt and CoB trilayer Josephson $$\pi $$ π junctions with perpendicular magnetic anisotropy
title_full_unstemmed Pt and CoB trilayer Josephson $$\pi $$ π junctions with perpendicular magnetic anisotropy
title_sort pt and cob trilayer josephson $$\pi $$ π junctions with perpendicular magnetic anisotropy
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/000496a38fd74c318e24f8fff2a8e464
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AT pmshepley ptandcobtrilayerjosephsonpipjunctionswithperpendicularmagneticanisotropy
AT edarwin ptandcobtrilayerjosephsonpipjunctionswithperpendicularmagneticanisotropy
AT bjhickey ptandcobtrilayerjosephsonpipjunctionswithperpendicularmagneticanisotropy
AT gburnell ptandcobtrilayerjosephsonpipjunctionswithperpendicularmagneticanisotropy
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