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The Route to Supercurrent Transparent Ferromagnetic Barriers in Superconducting Matrix
Yurii P Ivanov1,2,3, Soltan Soltan4,5, Joachim Albrecht6
1Department of Materials Science and Metallurgy , University of Cambridge , Cambridge CB3 0FS , United Kingdom.
ACS Nano
|April 13, 2019
Summary
Researchers created a novel superconductor/ferromagnet/superconductor trilayer. This structure features an ultrathin ferromagnetic barrier within high-temperature superconductors, crucial for advanced electronic applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- High-temperature superconductors (HTS) exhibit unique quantum phenomena.
- Controlling magnetic properties in proximity to superconducting layers is challenging.
- Understanding the interplay between ferromagnetism and superconductivity is key for novel devices.
Purpose of the Study:
- To engineer an ultrathin ferromagnetic barrier within HTS multilayers.
- To investigate the structural and geometric properties of the superconductor/ferromagnet interface.
- To explore the potential for novel superconducting devices utilizing ferromagnetic barriers.
Main Methods:
- Epitaxial growth of YBCO on SrTiO3 substrates via pulsed laser deposition.
- Fabrication of superconductor/ferromagnet/superconductor (SFS) trilayers.
- High-resolution electron microscopy for detailed structural characterization.
Main Results:
- Successfully realized a ferromagnetic barrier thinner than the coherence length in HTS.
- Developed a sophisticated trilayer structure with YBa2Cu3O7-δ (YBCO) and La0.67Ca0.33MnO3 (LCMO).
- YBCO copper oxide planes were oriented at an angle, directing the coherence length ovoid across the LCMO layer.
Conclusions:
- The study demonstrates the feasibility of creating ultrathin ferromagnetic barriers in HTS.
- The unique geometry achieved is critical for controlling the superconductor-ferromagnet interaction.
- This work paves the way for advanced superconducting spintronic devices.
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