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Long-range spin current driven by superconducting phase difference in a josephson junction with double layer
1Computational Condensed Matter Physics Laboratory, RIKEN, Wako, Saitama 351-0198, Japan and CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan.
Physical Review Letters
|August 29, 2014
Summary
This study shows long-range spin current in ferromagnet Josephson junctions, driven by superconducting phase differences. This current, carried by spin-triplet Cooper pairs, offers potential for advanced spintronics.
Area of Science:
- Condensed Matter Physics
- Spintronics
- Superconductivity
Background:
- Josephson junctions are crucial for quantum electronics.
- Understanding spin current propagation in magnetic heterostructures is key for spintronics.
- Spin-triplet Cooper pairs (STCs) are essential for novel quantum phenomena.
Purpose of the Study:
- To theoretically investigate spin current generation and propagation in ferromagnet-superconductor Josephson junctions.
- To explore the role of spin-triplet Cooper pairs in long-range spin current transport.
- To assess the potential of multilayer ferromagnets for spintronics applications.
Main Methods:
- Utilized quasiclassical theory to model the Josephson junction.
- Analyzed the formation and influence of spin-triplet Cooper pairs.
- Investigated the interplay between superconducting phase difference and spin current.
Main Results:
- Demonstrated long-range spin current driven by superconducting phase difference without voltage.
- Identified spin-triplet Cooper pairs as the mechanism for this spin current.
- Showed that STC-driven spin current propagates much farther than conventional spin currents.
Conclusions:
- Long-range spin current is achievable in ferromagnet Josephson junctions via STCs.
- Multilayer ferromagnet Josephson junctions show promise for spintronics with extended spin current reach.
- This work opens avenues for novel spintronic devices utilizing superconducting phenomena.
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