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Magnetic order and disorder in nanomagnets probed by superconducting vortices

We have studied two nanomagnet systems with strong (Co/Pd multilayers) and weak (NdCo alloy films) stray magnetic fields by probing the out-of-plane magnetic states with superconducting vortices. The hybrid samples are made of array of nanomagnets embedded in superconducting Nb thin films. The vorte...

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Autores principales: Rollano, V., del Valle, J., Gomez, A., Velez, M., Alvarez-Prado, L. M., Quiros, C., Martin, J. I., Osorio, M. R., Granados, D., Gonzalez, E. M., Vicent, J. L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6098083/
https://www.ncbi.nlm.nih.gov/pubmed/30120346
http://dx.doi.org/10.1038/s41598-018-30837-4
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author Rollano, V.
del Valle, J.
Gomez, A.
Velez, M.
Alvarez-Prado, L. M.
Quiros, C.
Martin, J. I.
Osorio, M. R.
Granados, D.
Gonzalez, E. M.
Vicent, J. L.
author_facet Rollano, V.
del Valle, J.
Gomez, A.
Velez, M.
Alvarez-Prado, L. M.
Quiros, C.
Martin, J. I.
Osorio, M. R.
Granados, D.
Gonzalez, E. M.
Vicent, J. L.
author_sort Rollano, V.
collection PubMed
description We have studied two nanomagnet systems with strong (Co/Pd multilayers) and weak (NdCo alloy films) stray magnetic fields by probing the out-of-plane magnetic states with superconducting vortices. The hybrid samples are made of array of nanomagnets embedded in superconducting Nb thin films. The vortex motion detects relevant magnetic state features, since superconducting vortices are able to discriminate between different magnetic stray field strengths and directions. The usual matching effect between the superconducting vortex lattice and the periodic pinning array can be quenched by means of disorder magnetic potentials with strong stray fields at random. Ordered stray fields retrieve the matching effect and yield asymmetry and shift in the vortex dissipation signal. Furthermore vortices can discriminate the sizes of the nanomagnet magnetic domains, detecting magnetic domain sizes as small as 70 nm. In addition, we observe that the vortex cores play the crucial role instead of the supercurrents around the vortex.
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spelling pubmed-60980832018-08-23 Magnetic order and disorder in nanomagnets probed by superconducting vortices Rollano, V. del Valle, J. Gomez, A. Velez, M. Alvarez-Prado, L. M. Quiros, C. Martin, J. I. Osorio, M. R. Granados, D. Gonzalez, E. M. Vicent, J. L. Sci Rep Article We have studied two nanomagnet systems with strong (Co/Pd multilayers) and weak (NdCo alloy films) stray magnetic fields by probing the out-of-plane magnetic states with superconducting vortices. The hybrid samples are made of array of nanomagnets embedded in superconducting Nb thin films. The vortex motion detects relevant magnetic state features, since superconducting vortices are able to discriminate between different magnetic stray field strengths and directions. The usual matching effect between the superconducting vortex lattice and the periodic pinning array can be quenched by means of disorder magnetic potentials with strong stray fields at random. Ordered stray fields retrieve the matching effect and yield asymmetry and shift in the vortex dissipation signal. Furthermore vortices can discriminate the sizes of the nanomagnet magnetic domains, detecting magnetic domain sizes as small as 70 nm. In addition, we observe that the vortex cores play the crucial role instead of the supercurrents around the vortex. Nature Publishing Group UK 2018-08-17 /pmc/articles/PMC6098083/ /pubmed/30120346 http://dx.doi.org/10.1038/s41598-018-30837-4 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Rollano, V.
del Valle, J.
Gomez, A.
Velez, M.
Alvarez-Prado, L. M.
Quiros, C.
Martin, J. I.
Osorio, M. R.
Granados, D.
Gonzalez, E. M.
Vicent, J. L.
Magnetic order and disorder in nanomagnets probed by superconducting vortices
title Magnetic order and disorder in nanomagnets probed by superconducting vortices
title_full Magnetic order and disorder in nanomagnets probed by superconducting vortices
title_fullStr Magnetic order and disorder in nanomagnets probed by superconducting vortices
title_full_unstemmed Magnetic order and disorder in nanomagnets probed by superconducting vortices
title_short Magnetic order and disorder in nanomagnets probed by superconducting vortices
title_sort magnetic order and disorder in nanomagnets probed by superconducting vortices
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6098083/
https://www.ncbi.nlm.nih.gov/pubmed/30120346
http://dx.doi.org/10.1038/s41598-018-30837-4
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