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Understanding voltage-controlled magnetic anisotropy effect at Co/oxide interface.

Tomohiro Nozaki1, Jun Okabayashi2, Shingo Tamaru3

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Summary
This summary is machine-generated.

Post-annealing enhances the voltage-controlled magnetic anisotropy (VCMA) effect in fcc-Co-(111) stacks. This study reveals that Pt diffusion at the Co/oxide interface increases orbital magnetic moments, boosting VCMA for spintronic devices.

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Area of Science:

  • Spintronics
  • Materials Science
  • Surface Science

Background:

  • Voltage-controlled magnetic anisotropy (VCMA) is crucial for high-speed, low-power spintronic devices.
  • Fcc-Co-(111)-based stacks show potential for large VCMA coefficients but are understudied.
  • The mechanism behind enhanced VCMA in Pt/Ru/Co/CoO/TiOx structures after post-annealing was unclear.

Purpose of the Study:

  • Investigate the origin of the VCMA effect at the Co/oxide interface in Pt/Ru/Co/CoO/TiOx structures.
  • Understand the mechanism behind the observed increase in voltage-controlled coercivity (VCC) after post-annealing.
  • Provide insights for designing fcc-Co-(111)-based stacks with enhanced VCMA.

Main Methods:

  • Multiprobes analyses were conducted on the Pt/Ru/Co/CoO/TiOx structure before and after post-annealing.
  • X-ray magnetic circular dichroism (XMCD) measurements were used to analyze magnetic properties.
  • Structural characterization was performed to understand atomic arrangements and diffusion.

Main Results:

  • Post-annealing significantly increased the voltage-controlled coercivity (VCC) of the Pt/Ru/Co/CoO/TiOx structure.
  • XMCD measurements revealed an increase in the orbital magnetic moment at the Co/oxide interface after post-annealing.
  • Evidence suggests Pt atom diffusion to the Co/oxide interface enhances interfacial properties.

Conclusions:

  • Pt diffusion into the Co/oxide interface is proposed as the mechanism for enhanced VCMA.
  • Increased interfacial orbital magnetic moment correlates with improved VCMA.
  • The findings offer a design strategy for optimizing VCMA in fcc-Co-(111)-based spintronic applications.