Effect of exchange interactions on the coercivity of SmCo5 nanoparticles made by cluster beam deposition

O. Akdogan, W. Li, B. Balasubramanian, D. J. Sellmyer, G. C. Hadjipanayis

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Single crystal SmCo5 nanoparticles with an average size of 3.5 nm are produced by cluster-beam deposition. When deposited without matrix, the nanoparticles showed a super-paramagnetic behavior with a blocking temperature of 145 K. Dispersion of the SmCo5 nanoparticles in a carbon matrix results in an increase in both the coercivity and the blocking temperature. Room temperature coercivities as high as 12 kOe are obtained for the first time in mono-layers of SmCo5 nanoparticles dispersed in C matrix. δM plots show that the interactions in the samples are of exchange type, which can decrease the overall effective anisotropy and coercivity according to the random-anisotropy model. Coercivity is found to be inversely proportional to the packing density of the particles. SmCo5 nanoparticles with high coercivity are potential candidates for the next generation ultra high-density magnetic recording media.

Original languageEnglish (US)
Pages (from-to)3262-3267
Number of pages6
JournalAdvanced Functional Materials
Volume23
Issue number26
DOIs
Publication statusPublished - Jul 12 2013

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Keywords

  • Sm-Co
  • cluster beam deposition
  • coercivity
  • nanoparticles

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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