Periodic Co/Nb pseudo spin valve for cryogenic memory
We present a study of magnetic structures with controllable effective exchange energy for Josephson switches and memory applications. As a basis for a weak link we propose to use a periodic structure composed of ferromagnetic (F) layers spaced by thin superconductors (s). Our calculations based on t...
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| Format: | Article |
| Language: | English |
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Beilstein-Institut
2019-04-01
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| Series: | Beilstein Journal of Nanotechnology |
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| Online Access: | https://doi.org/10.3762/bjnano.10.83 |
| _version_ | 1818529036036472832 |
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| author | Nikolay Klenov Yury Khaydukov Sergey Bakurskiy Roman Morari Igor Soloviev Vladimir Boian Thomas Keller Mikhail Kupriyanov Anatoli Sidorenko Bernhard Keimer |
| author_facet | Nikolay Klenov Yury Khaydukov Sergey Bakurskiy Roman Morari Igor Soloviev Vladimir Boian Thomas Keller Mikhail Kupriyanov Anatoli Sidorenko Bernhard Keimer |
| author_sort | Nikolay Klenov |
| collection | DOAJ |
| description | We present a study of magnetic structures with controllable effective exchange energy for Josephson switches and memory applications. As a basis for a weak link we propose to use a periodic structure composed of ferromagnetic (F) layers spaced by thin superconductors (s). Our calculations based on the Usadel equations show that switching from parallel (P) to antiparallel (AP) alignment of neighboring F layers can lead to a significant enhancement of the critical current through the junction. To control the magnetic alignment we propose to use a periodic system whose unit cell is a pseudo spin valve of structure F1/s/F2/s where F1 and F2 are two magnetic layers having different coercive fields. In order to check the feasibility of controllable switching between AP and P states through the whole periodic structure, we prepared a superlattice [Co(1.5 nm)/Nb(8 nm)/Co(2.5 nm)/Nb(8 nm)]6 between two superconducting layers of Nb(25 nm). Neutron scattering and magnetometry data showed that parallel and antiparallel alignment can be controlled with a magnetic field of only several tens of Oersted. |
| first_indexed | 2024-12-11T06:57:52Z |
| format | Article |
| id | doaj.art-2b59bf9a3221457d87a19e6b508ec30a |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-11T06:57:52Z |
| publishDate | 2019-04-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-2b59bf9a3221457d87a19e6b508ec30a2022-12-22T01:16:41ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862019-04-0110183383910.3762/bjnano.10.832190-4286-10-83Periodic Co/Nb pseudo spin valve for cryogenic memoryNikolay Klenov0Yury Khaydukov1Sergey Bakurskiy2Roman Morari3Igor Soloviev4Vladimir Boian5Thomas Keller6Mikhail Kupriyanov7Anatoli Sidorenko8Bernhard Keimer9Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119991, RussiaSkobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119991, RussiaSkobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119991, RussiaInstitute of Electronic Engineering and Nanotechnologies ASM, MD2028 Kishinev, MoldovaSkobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119991, RussiaInstitute of Electronic Engineering and Nanotechnologies ASM, MD2028 Kishinev, MoldovaMax-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, GermanySkobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119991, RussiaInstitute of Electronic Engineering and Nanotechnologies ASM, MD2028 Kishinev, MoldovaMax-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, GermanyWe present a study of magnetic structures with controllable effective exchange energy for Josephson switches and memory applications. As a basis for a weak link we propose to use a periodic structure composed of ferromagnetic (F) layers spaced by thin superconductors (s). Our calculations based on the Usadel equations show that switching from parallel (P) to antiparallel (AP) alignment of neighboring F layers can lead to a significant enhancement of the critical current through the junction. To control the magnetic alignment we propose to use a periodic system whose unit cell is a pseudo spin valve of structure F1/s/F2/s where F1 and F2 are two magnetic layers having different coercive fields. In order to check the feasibility of controllable switching between AP and P states through the whole periodic structure, we prepared a superlattice [Co(1.5 nm)/Nb(8 nm)/Co(2.5 nm)/Nb(8 nm)]6 between two superconducting layers of Nb(25 nm). Neutron scattering and magnetometry data showed that parallel and antiparallel alignment can be controlled with a magnetic field of only several tens of Oersted.https://doi.org/10.3762/bjnano.10.83cryogenic computingneutron scatteringspin valvesuperconducting spintronics |
| spellingShingle | Nikolay Klenov Yury Khaydukov Sergey Bakurskiy Roman Morari Igor Soloviev Vladimir Boian Thomas Keller Mikhail Kupriyanov Anatoli Sidorenko Bernhard Keimer Periodic Co/Nb pseudo spin valve for cryogenic memory Beilstein Journal of Nanotechnology cryogenic computing neutron scattering spin valve superconducting spintronics |
| title | Periodic Co/Nb pseudo spin valve for cryogenic memory |
| title_full | Periodic Co/Nb pseudo spin valve for cryogenic memory |
| title_fullStr | Periodic Co/Nb pseudo spin valve for cryogenic memory |
| title_full_unstemmed | Periodic Co/Nb pseudo spin valve for cryogenic memory |
| title_short | Periodic Co/Nb pseudo spin valve for cryogenic memory |
| title_sort | periodic co nb pseudo spin valve for cryogenic memory |
| topic | cryogenic computing neutron scattering spin valve superconducting spintronics |
| url | https://doi.org/10.3762/bjnano.10.83 |
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