Periodic Co/Nb pseudo spin valve for cryogenic memory
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KLENOV, Nikolai V.; KHAYDUKOV, Yu N.; BAKURSKIY, Sergey V.; MORARI, Roman; SOLOVIEV, Igor I.; BOIAN, Vladimir; KELLER, Thomas; KUPRIYANOV, Mihail; SIDORENCO, Anatoly; KEIMER, Bernhard. Periodic Co/Nb pseudo spin valve for cryogenic memory. In: Beilstein Journal of Nanotechnology. 2019, nr. 10, pp. 833-839. ISSN 2190-4286.
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Beilstein Journal of Nanotechnology
Numărul 10 / 2019 / ISSN 2190-4286

Periodic Co/Nb pseudo spin valve for cryogenic memory

Pag. 833-839

Klenov Nikolai V.123, Khaydukov Yu N.145, Bakurskiy Sergey V.12, Morari Roman6, Soloviev Igor I.12, Boian Vladimir6, Keller Thomas45, Kupriyanov Mihail127, Sidorenco Anatoly6, Keimer Bernhard4
1 D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University,
2 Moscow Institute of Physics and Technology,
3 All-Russian Research Institute of Automatics n.a. N.L. Dukhov (VNIIA), Moscow,
4 Max Planck Institute for Solid State Research,
5 Outstation at Heinz Maier-Leibnitz Zentrum (MLZ),
6 Institute of the Electronic Engineering and Nanotechnologies "D. Ghitu",
7 Kazan Federal University
Disponibil în IBN: 20 aprilie 2021


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.

Cryogenic computing, Neutron scattering, Spin valve, Superconducting spintronics