Interparticle magnetic correlations in dense Co nanoparticle assemblies
Skip to main content
eScholarship
Open Access Publications from the University of California

Interparticle magnetic correlations in dense Co nanoparticle assemblies

  • Author(s): Kortright, Jeffrey B.
  • Hellwig, Olav
  • Sun, Shouheng
  • Fullerton, Eric E.
  • et al.
Abstract

Resonant magnetic x-ray scattering from dense self-assemblies of 9-nm diameter epsilon-Co and hcp-Co particles is reported. For lower anisotropy epsilon-Co we find remanent magnetic scattering that is significantly enhanced, indicating preferred inter-particle moment orientations of both antiferromagnetic and ferromagnetic character. This interaction-mediated collective behavior is consistent with dipolar fields and exists well above the isolated particles blocking temperature where thermal activation is operative, suggesting that magnetostatic super-spin waves exist in such systems.

Main Content
Current View