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Atomic Scale Control of Spin Current Transmission at Interfaces.

Mohamed Amine Wahada1, Ersoy Şaşıoğlu2, Wolfgang Hoppe3

  • 1Max Planck Institute for Microstructure Physics, Weinberg 2, 06120 Halle, Germany.

Nano Letters
|April 20, 2022
PubMed
Summary
This summary is machine-generated.

Spin current transmission across ferromagnet/heavy metal interfaces is crucial for spintronics. This study reveals interface effects in Ta and Pt, showing interlayers can improve spin current transfer, a general phenomenon for 5d metals.

Keywords:
Orbital hybridizationSpin Hall effectSpin pumpingTHz currentsUltrafast demagnetizationUltrafast spin current

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Ferromagnet/heavy metal bilayers are key components in spintronic devices.
  • Efficient spin current generation and interfacial transfer are critical for device performance.

Purpose of the Study:

  • To investigate the theoretical and experimental aspects of spin current transfer across ferromagnet/heavy metal interfaces.
  • To understand the role of heavy metals like Tantalum (Ta) and Platinum (Pt) in spin current transmission.
  • To explore methods for enhancing spin current transfer efficiency.

Main Methods:

  • Theoretical modeling of spin current dynamics at interfaces.
  • Experimental characterization of ferromagnet/heavy metal bilayers.
  • Analysis of magnetic moment reduction due to 3d-5d hybridization.

Main Results:

  • Tantalum (Ta) interfaces partially transmit spin currents, while Platinum (Pt) interfaces show no such effect.
  • Magnetic moment reduction at the interface, caused by 3d-5d hybridization, is identified as the underlying mechanism.
  • Atomically thin interlayers are demonstrated to effectively mitigate spin current losses.

Conclusions:

  • The observed interfacial effects are a general phenomenon for 5d metals with less than a half-filled 5d shell.
  • Interface engineering using interlayers is a viable strategy to optimize spin current transfer in spintronic devices.
  • Understanding hybridization effects is essential for designing high-performance spintronic materials.