Hybrid Superconductor/Ferromagnet Compinents for Quantum Electronics


Project leader


Funding source

Swedish Research Council - Vetenskapsrådet (VR)


Project Details

Start date: 01/12/2006
End date: 30/11/2009
Funding: 2400000 SEK


Description

The project is aiming at experimental study of superconducting quantum devices, containing hybrid Superconductor-Ferromagnet (S/F) components. Ferromagnets with spin polarized electrons are antipathetic to superconductors, which contain singlet pairs with both spin up and down electrons. Therefore, unusual non-equilibrium effects appear at S/F interfaces where electronic systems of S and F metals are mixed via the proximity effect. Competition between superconductivity and ferromagnetism is of great fundamental interest for modern quantum physics. Moreover, hybrid S/F structures are of considerable interest for future applications in cryoelectronics. Within the project we are planning to fabricate and study several types of multilayer hybrid S/F structures, such as : (i) SFS pi-junctions and 0- pi junction circuits; (ii) nanoscale S/F structures, containing ballistic and mono-domain ferromagnet; (iii) multilayered vertically stacked spin valve structures with access to middle electrodes. Spin-polarized transport in S/F structures can be used in novel spintronic devices with advanced properties. SFS junctions, exhibiting a spontaneous pi-shift in the phase difference, can operate as quantum “phase batteries” which could allow effective decoupling from electromagnetic environment and lead to realization of a quite and topologically stable qubit (a basic element of a quantum computer) and for complimentary Josephson digital devices.

Last updated on 2017-31-03 at 12:58