Nanocrystalline Sm12.5(Co,Zr)87.5 magnets: Synthesis and magnetic properties

H. Tang, Y. Liu, D. J. Sellmyer

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Isotropic nanostructured Sm12.5Co87.5-xZrx (0≤x≤5) magnets with the TbCu7 structure have been synthesized by mechanical milling and subsequent annealing. The remanence is found much enhanced in the nanostructured Sm(Co,Zr)7 magnets with a grain size of 10-20 nm. A suitable amount of Zr addition (x = 1, 2) is helpful to improve hard magnetic properties, including high remanence ratio of 0.71, coercivities up to 21 kOe, and energy products up to 13.0 MGOe, and hard magnetic properties are sensitive to the milling time and the annealing temperature. The dependence of hard magnetic properties on milling time may be correlated to the refinement of grain size and the intergranular structure induced during the milling and the subsequent annealing. The enhancement of remanence due to a small amount of Zr in this series of Sm12.5Co87.5-xZrx powders results from the enhanced exchange coupling between the nanosized grains. The hard magnetic properties are discussed with correlation to the milling process and in terms of the nanostructure developed in these materials.

Original languageEnglish (US)
Pages (from-to)345-356
Number of pages12
JournalJournal of Magnetism and Magnetic Materials
Volume241
Issue number2-3
DOIs
StatePublished - Mar 2002

Keywords

  • Exchange coupling
  • Hard magnetic property
  • Mechanical milling
  • Nanostructured magnets
  • Permanent magnets
  • Sm(Co,Zr) magnets

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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