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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Nanostructure Effect on Magnetization Processes in FePt Polytwin Crystals.

Jingwei Yi1, Xinyu Xu1, Wenqin Yue1

  • 1Department of Materials Science and Engineering, Sichuan University-Pittsburgh Institute, Sichuan University, Chengdu 610065, China.

Materials (Basel, Switzerland)
|November 14, 2023
PubMed
Summary
This summary is machine-generated.

Polytwin boundaries in FePt crystals significantly influence magnetization processes. Mixed polytwin boundaries (Type III) exhibit coercivity between symmetric (Type I) and asymmetric (Type II) boundaries, impacting magnetic field response.

Keywords:
domain mechanismmagnetization processphase-field modelingpolytwin boundary

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • FePt polytwin crystals possess large magnetocrystalline anisotropy.
  • Polytwin boundaries are hypothesized to play a critical role in magnetization processes.

Purpose of the Study:

  • To investigate the impact of different polytwin boundary types on magnetization processes.
  • To analyze the effect of these boundaries on coercive fields under external magnetic fields.

Main Methods:

  • Phase-field modeling
  • Computer simulations
  • Systematic investigation of magnetic field effects

Main Results:

  • Domain wall motion is the dominant magnetization mechanism due to FePt's anisotropy.
  • Magnetization rotation becomes significant only at high external magnetic fields.
  • Low coercivity originates from domain wall motion initiated at polytwin boundary intersections.

Conclusions:

  • The type of polytwin boundary (Type I, II, or III) critically affects magnetization processes and coercivity.
  • Mixed polytwin boundaries (Type III) show intermediate coercivity values compared to Type I and II.
  • Understanding boundary effects is crucial for controlling magnetic properties in FePt materials.