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Domain-wall spin dynamics in kagome antiferromagnets.

E Lhotel1, V Simonet, J Ortloff

  • 1Institut Néel, CNRS & Université Joseph Fourier, BP 166, 38042 Grenoble Cedex 9, France. elsa.lhotel@grenoble.cnrs.fr

Physical Review Letters
|January 17, 2012
PubMed
Summary

New iron-based kagome antiferromagnets exhibit unusual slow spin dynamics due to domain walls. These dynamics evolve with decreasing temperature, likely influenced by dipolar interactions and forming independent magnetic grains.

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Area of Science:

  • Condensed Matter Physics
  • Magnetism
  • Materials Science

Background:

  • Frustrated magnets, such as kagome antiferromagnets, display complex magnetic behaviors due to competing interactions.
  • Iron-based kagome systems are of interest for their potential unique magnetic properties.

Purpose of the Study:

  • To investigate the magnetic properties and spin dynamics of a new family of iron-based kagome antiferromagnets.
  • To understand the influence of local spin anisotropy and network connectivity on magnetic ordering.

Main Methods:

  • Magnetization measurements down to 60 mK.
  • Neutron scattering experiments to probe spin dynamics.

Main Results:

  • Observed slow spin dynamics in the ordered phase, attributed to domain walls intersecting kagome planes via free spins.
  • Spin dynamics evolved from exchange-released spin flips to cooperative behavior with decreasing temperature.
  • Evidence of long-range dipolar interaction onset influencing spin dynamics.
  • Formation of a domain structure comprising independent magnetic grains.

Conclusions:

  • The studied iron-based kagome antiferromagnets exhibit novel slow spin dynamics.
  • The observed phenomena are linked to a combination of strong local spin anisotropy, low exchange connectivity, and dipolar interactions.
  • The resulting domain structure of independent magnetic grains may be a general characteristic of frustrated magnets.