Periodic Co/Nb pseudo spin valve for cryogenic memory

Beilstein Journal of Nanotechnology

Sergey Bakurskiy^1^2^3^4^5^6^7¹  Vladimir Boian^6²  Igor Soloviev^1^2^3^4^5^6^7³  Roman Morari^6⁴  Yury Khaydukov^1^2^3^4^5^6^7⁵  Nikolay Klenov^1^2^3^4^5^6^7⁶  Thomas Keller^1^2^3^4^5^6^7⁷ 

[1] All-Russian Research Institute of Automatics n.a. N.L. Dukhov (VNIIA), 127055, Moscow, Russia^3;Institute of Electronic Engineering and Nanotechnologies ASM, MD2028 Kishinev, Moldova^6;Max Planck Society Outstation at the Heinz Maier-Leibnitz Zentrum (MLZ), D-85748 Garching, Germany^5;Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany^4;Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, 141700, Russia^2;Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119991, Russia^1;Solid State Physics Department, KFU, 420008 Kazan, Russia more less^7

关键词: cryogenic computing;    neutron scattering;    spin valve;    superconducting spintronics;   

DOI  :  10.3762/bjnano.10.83

学科分类：地球科学(综合)

来源: Beilstein - Institut zur Foerderung der Chemischen Wissenschaften

【 摘 要 】

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.

【 授权许可】

CC BY