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Related Concept Videos

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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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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Crystal Field Theory
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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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Strain-controlled ferromagnetism in BiFeO3 nanoparticles.

E Ramos1, A Cardona-Rodríguez1, D Carranza-Celis1

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Journal of Physics. Condensed Matter : an Institute of Physics Journal
|January 15, 2020
PubMed
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Strain engineering in bismuth ferrite (BiFeO3) nanoparticles induces ferromagnetism. Nanoscale control of lattice parameters creates a spin imbalance, paving the way for novel voltage-controlled spintronic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Multiferroic materials are crucial for voltage-controlled spintronic devices.
  • Understanding electronic correlations in multiferroics is key.
  • Perovskite multiferroics exhibit sensitivity to strain effects.

Purpose of the Study:

  • To investigate strain-induced ferromagnetism in bismuth ferrite (BiFeO3) nanoparticles.
  • To explore the relationship between nanoscale strain and magnetic properties.
  • To provide insights into the mechanisms driving ferromagnetism in BiFeO3.

Main Methods:

  • Synthesis of BiFeO3 nanoparticles with controlled lattice parameters.
  • Experimental modification of BFO lattice parameters up to 0.15%.
  • Density functional theory (DFT) calculations to model electronic structure.

Main Results:

  • Ferromagnetism was successfully induced in BiFeO3 nanoparticles via strain engineering.
  • Small lattice distortions (approx. 0.01%) were found to cause significant spin imbalance.
  • Experimental synthesis parameters influenced BFO lattice parameters and induced ferromagnetism.

Conclusions:

  • Nanoscale strain engineering is an effective method to induce ferromagnetism in BiFeO3.
  • The findings explain ferromagnetism in strained BFO thin films.
  • This research offers a new pathway for developing voltage-controlled spintronic devices.