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Ferromagnetism01:31

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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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Homogenization method for microscopic characterization of the composite magnetoelectric multiferroics.

K P Jayachandran1, J M Guedes2, H C Rodrigues2

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This study simulates the magnetoelectric effect in multiferroic composites, revealing how external fields tune magnetization and electrical polarization. The findings offer insights into material properties for advanced applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Multiferroics

Background:

  • Tuning magnetization and electrical polarization with non-conjugate fields is crucial for novel applications.
  • The magnetoelectric effect in multiferroic composites offers a pathway to achieve this cross-field control.

Purpose of the Study:

  • To theoretically simulate and analyze the magnetoelectric effect in multiferroic 1-3 composites.
  • To develop a computational model for understanding the interplay between magnetic, electric, and elastic fields.

Main Methods:

  • A two-scale homogenization procedure based on variational analysis was formulated.
  • The model quantifies local fields (electric, magnetic, elastic) and stresses/strains.
  • The computational model was implemented using modified POSTMAT software.

Main Results:

  • Local stress/strain profiles and von Mises stresses were computed, providing insights into magnetostriction and polarization.
  • Average polarization and magnetization were calculated against applied fields, showing reasonable agreement with experimental data.
  • The model successfully captures the behavior of multiferroic composites irrespective of crystallographic symmetry.

Conclusions:

  • The developed homogenization model offers computational efficiency for analyzing multiferroic composites.
  • It provides valuable insights into microscopic field characteristics and their impact on material properties.
  • The findings support the potential of multiferroic composites for applications requiring tunable magnetic and electric responses.