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Magnetoelectric multipoles in metals.

Florian Thöle1, Nicola A Spaldin2

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This study computationally identifies magnetoelectric multipoles in magnetic metals, previously only theorized in insulators. Researchers found these multipoles in various metallic systems, revealing new magnetoelectric effects.

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density functional theorymagnetoelectric effectnon-centrosymmetric materials

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Materials Science

Background:

  • Magnetoelectric multipoles are crucial for the magnetoelectric effect in non-centrosymmetric magnetic insulators.
  • Their existence in metallic systems, where mobile carriers screen electrical polarization, has not been previously demonstrated.
  • Understanding magnetoelectric phenomena in metals is key to novel electronic applications.

Purpose of the Study:

  • To computationally demonstrate the existence of magnetoelectric multipoles in non-centrosymmetric magnetic metals.
  • To investigate the behavior and implications of magnetoelectric multipoles in different metallic systems.
  • To explore the relationship between structural distortions, magnetic order, and magnetoelectric properties.

Main Methods:

  • Utilized first-principles density functional calculations.
  • Investigated three distinct systems: a surface-modified centrosymmetric metal (Fe), a hypothetical perovskite (SrCaRu2O6), and a non-centrosymmetric antiferromagnetic metal (Ca3Ru2O7).
  • Analyzed the multipole expansion of magnetization density and its relation to symmetry breaking and magnetic structure.

Main Results:

  • Demonstrated magnetoelectric multipoles in magnetic metals, specifically identifying magnetoelectric monopoles and perpendicular magnetoelectric response in surface-modified Fe.
  • Observed proportional scaling of magnetic dipoles and multipoles with polar symmetry breaking in SrCaRu2O6.
  • Revealed distinct magnetoelectric multipolar structures in competing magnetic phases of Ca3Ru2O7, correlating with transport properties.

Conclusions:

  • Magnetoelectric multipoles exist and play a significant role in non-centrosymmetric magnetic metals.
  • The findings open new avenues for exploring magnetoelectric effects in metallic systems.
  • Computational methods can effectively predict and analyze complex magnetoelectric phenomena in materials.