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Long-range spin-polarized quasiparticle transport in mesoscopic Al superconductors with a Zeeman splitting
F Hübler1, M J Wolf, D Beckmann
1Institut für Nanotechnologie, Karlsruher Institut für Technologie, Karlsruhe, Germany.
We observed long-distance spin transport in superconductor-ferromagnet devices, exceeding typical length scales. This spin signal
Area of Science:
- Condensed matter physics
- Spintronics
- Superconductivity
Background:
- Nonlocal transport phenomena in hybrid structures are crucial for spintronics.
- Understanding spin dynamics in superconductor-ferromagnet (S-F) systems is key to advancing quantum technologies.
Purpose of the Study:
- To investigate nonlocal spin transport in multiterminal superconductor-ferromagnet structures.
- To explore the influence of Zeeman splitting on spin relaxation lengths.
Main Methods:
- Fabrication of multiterminal superconductor-ferromagnet structures using e-beam lithography and shadow evaporation.
- Measurement of nonlocal spin transport signatures in the presence of magnetic fields.
Main Results:
- Observed spin transport over several micrometers, surpassing coherence, spin-diffusion, and charge-imbalance lengths.
- Demonstrated a nearly linear increase in spin signal relaxation length with magnetic field.
- Evidence suggests Zeeman splitting freezes out relaxation mechanisms.
Conclusions:
- The relaxation length is likely governed by quasiparticle recombination, not renormalized spin-diffusion.
- This work highlights the potential for long-range spin manipulation in S-F hybrid systems.
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