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Structure and magnetism in Cr-embedded Co nanoparticles.

S H Baker1, M S Kurt, M Roy

  • 1Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|January 8, 2016
PubMed
Summary

We studied cobalt nanoparticles within a chromium matrix, finding a core-shell structure. This structure causes reduced magnetism and exchange bias in the cobalt nanoparticles.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Nanocomposite films offer tunable magnetic and structural properties.
  • Understanding nanoparticle-matrix interactions is crucial for advanced materials.

Purpose of the Study:

  • To investigate the atomic structure and magnetism of cobalt nanoparticles embedded in a chromium matrix.
  • To elucidate the core-shell structure and its influence on magnetic properties.

Main Methods:

  • Co-deposition using gas aggregation and molecular beam epitaxy (MBE).
  • Extended X-ray Absorption Fine Structure (EXAFS) for atomic structure analysis.
  • Vibrating sample magnetometry (VSM) for magnetic property investigation.

Main Results:

  • Cobalt nanoparticles adopt a body-centered cubic (bcc) structure, similar to the chromium matrix, with some disorder.
  • Net cobalt magnetic moment per atom is significantly reduced compared to bulk cobalt, decreasing with lower cobalt concentration.
  • All samples exhibited exchange bias after field cooling below 30 K, with the largest effect in the most dilute sample.

Conclusions:

  • Structural and magnetic findings suggest interfacial alloying, forming a core-shell structure.
  • The core consists of a reduced ferromagnetic cobalt core, surrounded by an antiferromagnetic cobalt-chromium alloy shell.
  • This core-shell structure explains the observed reduced magnetism and exchange bias in the cobalt nanoparticles.