Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 17: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs
TT 17.10: Vortrag
Montag, 31. März 2014, 17:30–17:45, HSZ 201
Long Range Triplet Josephson Current and 0−π Transition in Tunable Domain Walls — Thomas E. Baker1,2, Adam C. Richie-Halford1,3, and •Andreas Bill1 — 1Dept. of Physics & Astronomy, California State University, Long Beach, CA 90840, USA — 2Dept. of Physics & Astronomy, University of California, Irvine, CA 92697, USA — 3Department of Physics, University of Washington, Seattle, WA 98195, USA
The order parameter of superconducting pairs penetrating an inhomogeneous magnetic material can acquire a long range triplet component (LRTC) with non-zero spin projection of the pairs (Sz=± 1). This state has been predicted and generated recently in proximity systems and Josephson junctions. We show using an analytically derived domain wall of an exchange spring how the LRTC emerges and can be tuned with the twisting of the magnetization [1]. We also introduce a new kind of Josephson current reversal, the triplet 0−π transition, that can be observed in one and the same system either by tuning the domain wall or by varying temperature. Finally, we show how the LRTC may be manipulated to produce a singlet current and how it can be observed in a superconducting-magnetic multilayer.
We gratefully acknowledge the support of the National Science Foundation (DMR-0907242), the Army Research Laboratory and the Research Corporation.
T.E. Baker, A. Richie-Halford, and A. Bill, arXiv:1310.6632