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L10-FeNi films on Au-Cu-Ni buffer-layer: a high-throughput combinatorial study.

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This study explores critical-elements-free magnetic materials, specifically Au-Cu-Ni alloys. Decreasing gold content in the buffer layer enhances the hard magnetic phase, increasing coercivity and anisotropy for advanced magnetic applications.

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Area of Science:

  • Materials Science
  • Magnetism
  • Thin Film Technology

Background:

  • The L10-FeNi alloy is a promising critical-elements-free magnetic material.
  • Au-Cu-Ni alloys show potential, but buffer-layer effects on FeNi phase formation need investigation.

Purpose of the Study:

  • Investigate the impact of buffer-layer composition on L10-FeNi phase formation.
  • Optimize Au-Cu-Ni alloy composition for enhanced magnetic properties using a combinatorial approach.

Main Methods:

  • Combinatorial approach utilizing High-Throughput (HT) experimental methods.
  • HT magnetic characterization to analyze magnetic properties and phase formation.

Main Results:

  • Identified a hard magnetic phase with an out-of-plane easy-axis.
  • Coercivity increased from 0.49 to 1.30 kOe as Au content in the Cu-Au-Ni buffer layer decreased.
  • Magneto-crystalline anisotropy energy density increased from 0.12 to 0.35 MJ/m3 with decreasing Au content.

Conclusions:

  • The magnetic properties are modulated by the Au content in the buffer layer, primarily due to variations in interlayer diffusion.
  • These diffusion processes significantly influence the formation and ordering of the L10 FeNi phase.
  • The study accelerates the search for optimal Au-Cu-Ni compositions for high-performance magnetic materials.