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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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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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Superhigh Magnetostriction in Non-Equilibrium Grown Fe-Ga Single-Crystals by Rapid-Directional-Solidification.

Yichen Xu1, Yuye Wu1, Yunquan Li1

  • 1School of Materials Science and Engineering, Beihang University, Beijing, 100191, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|April 22, 2025
PubMed
Summary

A new rapid-directional-solidification (RDS) method enables the growth of non-equilibrium Fe-Ga single-crystals with enhanced magnetostriction. This breakthrough overcomes previous limitations, paving the way for advanced materials in engineering applications.

Keywords:
Fe‐Gamagnetostrictionnon‐equilibriumrapid‐directional‐solidificationsingle‐crystal

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Non-equilibrium microstructures, specifically Tb supersaturation in Fe-Ga single-crystals, are known to enhance magnetostriction.
  • Current methods struggle to produce non-equilibrium single-crystals, limiting advancements in magnetostriction.

Purpose of the Study:

  • To develop a novel strategy for growing non-equilibrium single-crystals.
  • To achieve significant enhancements in magnetostriction through controlled non-equilibrium processing.

Main Methods:

  • A rapid-directional-solidification (RDS) strategy was employed.
  • Achieved an ultrahigh temperature gradient (≈10^6 K m^-1) and ultrafast growth velocity.
  • Utilized giant cooling rates (10^2-10^3 K s^-1) for single-crystal growth under non-equilibrium conditions.

Main Results:

  • Successfully grew a non-equilibrium Fe-Ga single-crystal with Tb supersaturation.
  • Achieved a record magnetostriction of 489 ppm in bulk Fe-Ga materials, a 60% increase over previous single-crystal values.
  • The RDS method produced single-crystals under non-equilibrium conditions, unlike prior methods.

Conclusions:

  • The RDS strategy is effective for fabricating non-equilibrium single-crystals with superior properties.
  • This advancement opens new possibilities for creating high-performance single-crystals for engineering applications.
  • The study demonstrates a pathway to overcome limitations in achieving enhanced magnetostriction.