Berlin 2008 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 15: Superconductivity: Poster Session
TT 15.34: Poster
Tuesday, February 26, 2008, 14:00–18:00, Poster B
Fraunhofer pattern of a S-F-S Josephson junction as a function of the magnetization orientation — •Franz Czeschka1, Sebastian T.B. Goennenwein1, Rudolf Gross1, Ruurd S. Keizer2, Teun M. Klapwijk2, and Arunava Gupta3 — 1Walther-Meissner-Insitut, Garching, Germany — 2Kavli Institute of NanoScience, Delft, The Netherlands — 3MINT Center, Tuscaloosa, Alabama
In the last decade the interest in superconductor-ferromagnet hybrid structures has substantially increased due to their potential application in spintronics and quantum computation. Moreover the competing ordering phenomena in superconductors (S) and ferromagnets (F) lead to interesting physical effects.
We have fabricated S-F-S Josephson junctions made of the superconductor NbTiN and the ferromagnet CrO2. With its high spin polarization and large ferromagnetic domains, CrO2 is ideally suited for the investigation of magnetization orientation dependent effects in S-F-S Josephson junctions. We have investigated the dependence of the critical current on the magnitude and the orientation of the external magnetic field of NbTiN/CrO2/NbTiN lateral Josephson junctions, fabricated by e-beam lithography, sputtering and lift-off. We find a strongly hysteretic Fraunhofer pattern with an oscillation period which characteristically changes with the magnetization orientation. We interpret these results in terms of the total magnetic flux B=µ0 (H+M) in the structure.
Financial support of the German Excellence Initiative via the “Nanosystems Initiative Munich (NIM)” is gratefully acknowledged.