Effect of interface roughness on superconducting transition temperatures of Nb/Co multilayers

Liu, L.Y.; Hernandez, U.D. Chacón; Xing, Yutao; Suguihiro, N. M.; Haeussler, D.; Baggio-Saitovitch, E.; Jäger, W.; Solórzano, I. G.

doi:10.1016/j.jmmm.2015.10.048

Journal of Magnetism and Magnetic Materials

2016

DOI: 10.1016/j.jmmm.2015.10.048

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Effect of interface roughness on superconducting transition temperatures of Nb/Co multilayers

L.Y. Liu

U.D. Chacón Hernandez

Yutao Xing

et al.

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“…To do this we fabricate Nb(25nm)/[Co(1.5nm)/Nb(8nm)/Co(2.5nm)/Nb(8nm)] 6 /Co(1.5nm)/Nb(25nm) structure. We take niobium as a superconducting material since it has the highest T C = 9.25 K among all elemental superconductors and forms stable structures with cobalt [18][19][20][21][22][23]. Thickness of the Nb-spacer was chosen to be close to ξ S ≈ 6 − 10nm, the value have been found in our prior studies [24,25].…”

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confidence: 99%

Periodic Co/Nb pseudo spin valve for cryogenic memory

Klenov¹,

Khaydukov²,

Bakurskiy³

et al. 2019

Beilstein J. Nanotechnol.

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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.

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mentioning

confidence: 99%

Periodic Co/Nb pseudo spin valve for cryogenic memory

Klenov¹,

Khaydukov²,

Bakurskiy³

et al. 2019

Beilstein J. Nanotechnol.

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Study of the influence of Nb buffer layer on the exchange coupling induced at the Co/IrMn interface

Merino

Figueiredo

Passamani

et al. 2017

Journal of Magnetism and Magnetic Materials

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Effect of interface roughness on superconducting transition temperatures of Nb/Co multilayers

Cited by 2 publications

References 11 publications

Periodic Co/Nb pseudo spin valve for cryogenic memory

Periodic Co/Nb pseudo spin valve for cryogenic memory

Study of the influence of Nb buffer layer on the exchange coupling induced at the Co/IrMn interface

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