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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Summary
This summary is machine-generated.

The surface of certain antiferromagnets can be multiferroic, exhibiting electric and magnetic properties, unlike their bulk counterparts. This bulk-boundary correspondence is observed even without spin-orbit interaction.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Centrosymmetric, collinear, compensated antiferromagnets possess bulk ferroically ordered magnetic octupoles.
  • The bulk of these materials typically lacks polarity, net magnetization, and linear magnetoelectric response.

Purpose of the Study:

  • To investigate the surface properties of specific antiferromagnets.
  • To determine if the surface exhibits multiferroic behavior.
  • To explore the role of magnetic octupoles and spin-orbit interaction.

Main Methods:

  • Theoretical analysis of bulk-boundary correspondence in antiferromagnets.
  • First-principles calculations.
  • Utilizing FeF2 as an example material.

Main Results:

  • The surface of these antiferromagnets exhibits a linear magnetoelectric effect, net magnetization, and electric dipole moment.
  • The surface fulfills all criteria for being multiferroic.
  • Surface multiferroicity and bulk magnetic octupoles can exist without spin-orbit interaction in nonrelativistic d-wave spin split antiferromagnets.

Conclusions:

  • The surface of unconventional antiferromagnets can display multiferroic properties, contrasting with their non-multiferroic bulk.
  • Bulk-boundary correspondence is a key phenomenon in these materials.
  • The findings are exemplified by first-principles calculations on FeF2.