Satchell, N orcid.org/0000-0003-1597-2489, Quarterman, P, Borchers, JA et al. (2 more authors) (2023) Absence of magnetic interactions in Ni–Nb ferromagnet–superconductor bilayers. Superconductor Science and Technology, 36 (5). 054002. ISSN 0953-2048
Abstract
Studies of ferromagnet-superconductor hybrid systems have uncovered magnetic interactions between the competing electronic orderings. The electromagnetic (EM) proximity effect predicts the formation of a spontaneous vector potential inside a superconductor placed in proximity to a ferromagnet. In this work, we use a Nb superconducting layer and Ni ferromagnetic layer to test for such magnetic interactions. We use the complementary, but independent, techniques of polarized neutron reflectometry and detection Josephson junctions to probe the magnetic response inside the superconducting layer at close to zero applied field. In this condition, Meissner screening is negligible, so our measurements examine only additional magnetic and screening contributions from proximity effects. We report the absence of any signals originating from EM proximity effect in zero applied field. Our observations indicate that either EM proximity effect is below the detection resolution of both of our experiments or may indicate a new phenomenon that requires extension of current theory. From our measurements, we estimate a limit of the size of the zero field EM proximity effect in our Ni–Nb samples to be ±0.27 mT.
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Copyright, Publisher and Additional Information: | © 2023 The Author(s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. | ||||||
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Institution: | The University of Leeds | ||||||
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Condensed Matter (Leeds) | ||||||
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Depositing User: | Symplectic Publications | ||||||
Date Deposited: | 14 Mar 2023 10:45 | ||||||
Last Modified: | 25 Jun 2023 23:17 | ||||||
Status: | Published | ||||||
Publisher: | Institute of Physics Publishing | ||||||
Identification Number: | https://doi.org/10.1088/1361-6668/acc430 | ||||||
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