Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layer
Odd-frequency triplet Cooper pairs are believed to be the carriers of long-range superconducting correlations in ferromagnets. Such triplet pairs are generated by an inhomogeneous magnetism at the interface between a superconductor (S) and a ferromagnet (F). So far, reproducible long-range effects w...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2017-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/aa5de8 |
| _version_ | 1827873537953628160 |
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| author | C Cirillo S Voltan E A Ilyina J M Hernández A García-Santiago J Aarts C Attanasio |
| author_facet | C Cirillo S Voltan E A Ilyina J M Hernández A García-Santiago J Aarts C Attanasio |
| author_sort | C Cirillo |
| collection | DOAJ |
| description | Odd-frequency triplet Cooper pairs are believed to be the carriers of long-range superconducting correlations in ferromagnets. Such triplet pairs are generated by an inhomogeneous magnetism at the interface between a superconductor (S) and a ferromagnet (F). So far, reproducible long-range effects were reported only in complex layered structures designed to provide the magnetic inhomogeneity. Here we show that spin triplet pair formation can be found in simple unstructured Nb/permalloy ( $\mathrm{Py}={\mathrm{Ni}}_{0.8}{\mathrm{Fe}}_{0.2}$ )/Nb trilayers and Nb/Py bilayers, but only when the thickness of the ferromagnetic layer ranges between 140 and 250 nm. The effect is related to the emergence of an intrinsically inhomogeneous magnetic state, which is a precursor of the well-known stripe regime in Py that in our samples sets in at thickness larger than 300 nm. |
| first_indexed | 2024-03-12T16:38:32Z |
| format | Article |
| id | doaj.art-70634688742a4f03859929fb143e6039 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:38:32Z |
| publishDate | 2017-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-70634688742a4f03859929fb143e60392023-08-08T14:37:13ZengIOP PublishingNew Journal of Physics1367-26302017-01-0119202303710.1088/1367-2630/aa5de8Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layerC Cirillo0https://orcid.org/0000-0001-8755-4484S Voltan1E A Ilyina2J M Hernández3A García-Santiago4J Aarts5C Attanasio6https://orcid.org/0000-0002-3848-9169CNR-SPIN Salerno and Dipartimento di Fisica ‘E. R. Caianiello’, Università degli Studi di Salerno , via Giovanni Paolo II 132, I-84084 Fisciano (Sa), ItalyKamerlingh Onnes-Huygens Laboratory, Leiden University , PO Box 9504, 2300 RA Leiden, The NetherlandsCNR-SPIN Salerno and Dipartimento di Fisica ‘E. R. Caianiello’, Università degli Studi di Salerno , via Giovanni Paolo II 132, I-84084 Fisciano (Sa), ItalyGrup de Magnetisme, Departament de Física de la Matèria Condensada, Facultat de Física, Universitat de Barcelona , c. Martí i Franquès 1, planta 4, edifici nou, E-08028 Barcelona, Spain; Institut de Nanociència i Nanotecnologia IN2UB, Universitat de Barcelona , E-08028 Barcelona, SpainGrup de Magnetisme, Departament de Física de la Matèria Condensada, Facultat de Física, Universitat de Barcelona , c. Martí i Franquès 1, planta 4, edifici nou, E-08028 Barcelona, Spain; Institut de Nanociència i Nanotecnologia IN2UB, Universitat de Barcelona , E-08028 Barcelona, SpainKamerlingh Onnes-Huygens Laboratory, Leiden University , PO Box 9504, 2300 RA Leiden, The NetherlandsCNR-SPIN Salerno and Dipartimento di Fisica ‘E. R. Caianiello’, Università degli Studi di Salerno , via Giovanni Paolo II 132, I-84084 Fisciano (Sa), ItalyOdd-frequency triplet Cooper pairs are believed to be the carriers of long-range superconducting correlations in ferromagnets. Such triplet pairs are generated by an inhomogeneous magnetism at the interface between a superconductor (S) and a ferromagnet (F). So far, reproducible long-range effects were reported only in complex layered structures designed to provide the magnetic inhomogeneity. Here we show that spin triplet pair formation can be found in simple unstructured Nb/permalloy ( $\mathrm{Py}={\mathrm{Ni}}_{0.8}{\mathrm{Fe}}_{0.2}$ )/Nb trilayers and Nb/Py bilayers, but only when the thickness of the ferromagnetic layer ranges between 140 and 250 nm. The effect is related to the emergence of an intrinsically inhomogeneous magnetic state, which is a precursor of the well-known stripe regime in Py that in our samples sets in at thickness larger than 300 nm.https://doi.org/10.1088/1367-2630/aa5de8superconductivitymagnetismheterostructuresproximity effectdimensional crossover |
| spellingShingle | C Cirillo S Voltan E A Ilyina J M Hernández A García-Santiago J Aarts C Attanasio Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layer New Journal of Physics superconductivity magnetism heterostructures proximity effect dimensional crossover |
| title | Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layer |
| title_full | Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layer |
| title_fullStr | Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layer |
| title_full_unstemmed | Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layer |
| title_short | Long-range proximity effect in Nb-based heterostructures induced by a magnetically inhomogeneous permalloy layer |
| title_sort | long range proximity effect in nb based heterostructures induced by a magnetically inhomogeneous permalloy layer |
| topic | superconductivity magnetism heterostructures proximity effect dimensional crossover |
| url | https://doi.org/10.1088/1367-2630/aa5de8 |
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