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Antiphase boundaries (APBs) in Fe70Al30 exhibit enhanced ferromagnetism due to atomic disorder. This finding challenges traditional understanding and offers new avenues for materials engineering.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Crystallography

Background:

  • Direct magnetization measurements of antiphase boundaries (APBs) are crucial for materials science.
  • Experimental tools for in-depth APB examination have been limited.
  • APBs are planar defects found in ordered crystals.

Purpose of the Study:

  • To investigate the relationship between APBs and ferromagnetic spin order in Fe70Al30.
  • To characterize the magnetic properties and atomic structure of APBs.

Main Methods:

  • Electron microscopy observations
  • Electron holography studies
  • Magnetization measurements

Main Results:

  • Thermally induced APBs in Fe70Al30 have a finite width (2-3 nm) with significant atomic disorder.
  • Magnetic flux density at APBs is amplified by approximately 60% compared to the matrix.
  • At elevated temperatures, ferromagnetism is confined within the APB region, forming a peculiar spin texture.

Conclusions:

  • Ferromagnetism can be stabilized by structural disorder within APBs, contradicting traditional understanding.
  • These findings provide conceptual insights for engineering APB-induced phenomena.
  • The study highlights the potential of APBs for novel magnetic materials.