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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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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Temperature-Dependent Phase Evolution in FePt-Based Nanocomposite Multiple-Phased Magnetic Alloys.

Ovidiu Crisan1, Alina Daniela Crisan1, Nirina Randrianantoandro2

  • 1National Institute for Materials Physics, P.O. Box MG-7, 077125 Magurele, Romania.

Nanomaterials (Basel, Switzerland)
|December 11, 2022
PubMed
Summary
This summary is machine-generated.

A novel Fe-Pt-Nb-B alloy was developed, revealing multiple magnetic phases with unique temperature-dependent properties. Optimal annealing at 700 °C yields promising magnetic features for diverse applications.

Keywords:
57Fe Mössbauer spectroscopymagnetic multiphase materialsmelt spun ribbons

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Magnetism

Background:

  • Fabrication of advanced magnetic materials is crucial for technological innovation.
  • Understanding phase interactions in multi-component alloys is key to tailoring magnetic properties.

Purpose of the Study:

  • To create a quaternary Fe-Pt-Nb-B alloy with coherent magnetic phases from a metastable precursor.
  • To investigate phase interactions and their impact on magnetic performance.
  • To explore the influence of annealing on phase formation and magnetic behavior.

Main Methods:

  • Melt spinning for alloy fabrication.
  • X-ray diffraction and transmission electron microscopy for structural analysis.
  • 57Fe Mössbauer spectroscopy for hyperfine parameter determination.
  • SQUID magnetometry for magnetic property evaluation.

Main Results:

  • Metastable phases formed during primary crystallization, followed by fcc Fe3Pt and fct Fe2B formation at higher annealing temperatures (700 °C, 800 °C).
  • 57Fe Mössbauer spectroscopy provided detailed hyperfine parameters for each phase.
  • The fcc A1 FePt phase exhibited a gradual ferromagnetic transition between 300 K and 77 K.
  • Optimal magnetic properties were achieved upon annealing at 700 °C, with nanocrystalline samples showing behavior consistent with the random anisotropy model.

Conclusions:

  • The Fe-Pt-Nb-B alloy system allows for the formation of multiple magnetic phases with tunable properties.
  • Annealing temperature significantly influences phase evolution and magnetic characteristics.
  • The alloy demonstrates potential for applications requiring distinct magnetic states at various operating temperatures.