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Fully Spin-Transparent Magnetic Interfaces Enabled by the Insertion of a Thin Paramagnetic NiO Layer.

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Inserting a nickel oxide (NiO) layer eliminates spin backflow and spin-memory loss in platinum-based devices. This significantly boosts spin-current transmission and the energy efficiency of spin-orbit torque technologies.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Spin backflow and spin-memory loss reduce spin transmissivity at metallic magnetic interfaces.
  • This energy loss hinders the efficiency of spin-orbit torque technologies.

Purpose of the Study:

  • To investigate the elimination of spin backflow and spin-memory loss.
  • To enhance spin-current transmission and energy efficiency in Pt-based heavy metal-ferromagnet interfaces.
  • To develop energy-efficient spin-current generators for spintronic applications.

Main Methods:

  • Insertion of an insulating paramagnetic NiO layer of optimum thickness at Pt-based heavy metal-ferromagnet interfaces.
  • Utilizing thermal magnon-mediated spin-current transmission.
  • Characterization of dampinglike spin-orbit torque efficiency using FeCoB and other ferromagnets.

Main Results:

  • Effective elimination of spin backflow and spin-memory loss was achieved.
  • Near-unity spin-current transmission at room temperature due to enhanced spin-mixing conductance.
  • Achieved dampinglike spin-orbit torque efficiency up to 0.8, reaching the theoretical limit for Pt.
  • Pt/NiO and Pt-Hf/NiO demonstrated over 100 times greater energy efficiency than topological insulators.

Conclusions:

  • The insertion of an optimized NiO layer effectively suppresses detrimental spin dynamics.
  • Pt/NiO interfaces serve as highly efficient, integration-friendly, and durable spin-current generators.
  • This advancement is crucial for improving spin-orbitronic research and spin-torque technologies.