This title appears in the Scientific Report :
2007
Please use the identifier:
http://dx.doi.org/10.2007/s00339-007-4206-3 in citations.
Ferromagnetic o-pi Josephson junctions
Ferromagnetic o-pi Josephson junctions
We present a study on low-T-c superconductor-insulator-ferromagnet-superconductor (SIFS) Josephson junctions. SIFS junctions have gained considerable interest in recent years because they show a number of interesting properties for future classical and quantum computing devices. We optimized the fab...
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Personal Name(s): | Weides, M. |
---|---|
Kohlstedt, H. / Waser, R. / Kemmler, M. / Pfeiffer, J. / Koelle, D. / Kleiner, R. / Goldobin, E. | |
Contributing Institute: |
Elektronische Materialien; IFF-6 JARA-FIT; JARA-FIT Center of Nanoelectronic Systems for Information Technology; CNI |
Published in: | Applied physics / A, 89 (2007) S. 613 |
Imprint: |
Berlin
Springer
2007
|
Physical Description: |
613 |
DOI: |
10.2007/s00339-007-4206-3 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Applied Physics A
89 |
Subject (ZB): | |
Publikationsportal JuSER |
We present a study on low-T-c superconductor-insulator-ferromagnet-superconductor (SIFS) Josephson junctions. SIFS junctions have gained considerable interest in recent years because they show a number of interesting properties for future classical and quantum computing devices. We optimized the fabrication process of these junctions to achieve a homogeneous current transport, ending up with high-quality samples. Depending on the thickness of the ferromagnetic layer and on temperature, the SIFS junctions are in the ground state with a phase drop of either 0 or pi. By using a ferromagnetic layer with variable step-like thickness along the junction, we obtained a so-called 0-pi Josephson junction, in which 0 and pi ground states compete with each other. At a certain temperature the 0 and pi parts of the junction are perfectly symmetric, i.e. the absolute critical current densities are equal. In this case the degenerate ground state corresponds to a vortex of supercurrent circulating clock- or counterclockwise and creating a magnetic flux which carries a fraction of the magnetic flux quantum phi(0). |