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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
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Multifunctional behaviors in meta-magnetic shape-memory microwires.

Zongbin Li1, Claude Esling2,3

  • 1Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Material Science and Engineering, Northeastern University, Shenyang, 110819, People's Republic of China.

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|October 3, 2019
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Summary

New nickel-copper-cobalt-manganese-indium (NiCuCoMnIn) microwires exhibit excellent mechanical and magnetic properties. These materials show significant tensile superelasticity and a strong magnetocaloric effect for advanced applications.

Keywords:
magnetocaloric effectmagnetostructural transformationmeta-magnetic shape-memory microwiressuperelasticity

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Advanced materials with unique microstructures are crucial for developing novel functional devices.
  • Nickel-based alloys are known for their shape memory and magnetic properties.

Purpose of the Study:

  • To synthesize and characterize oligocrystalline NiCuCoMnIn microwires.
  • To investigate the mechanical and magnetic properties of these microwires.

Main Methods:

  • Preparation of NiCuCoMnIn microwires using advanced fabrication techniques.
  • Microstructural analysis to identify the oligocrystalline and bamboo-like grain structure.
  • Mechanical testing to evaluate tensile superelasticity.
  • Magnetic measurements to assess the magnetocaloric effect.

Main Results:

  • Successfully synthesized NiCuCoMnIn microwires with an oligocrystalline structure and bamboo-like grains.
  • Demonstrated pronounced tensile superelasticity, indicating significant mechanical robustness.
  • Observed a notable magnetocaloric effect, highlighting potential for magnetic cooling applications.

Conclusions:

  • The synthesized NiCuCoMnIn microwires possess a unique microstructure leading to excellent mechanical and magnetic properties.
  • These findings suggest potential applications in areas requiring high-performance materials, such as actuators and magnetic refrigeration.